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126-471: The earliest known European immigrant who settled on the banks of the Brunette River near the present-day North Road in 1860 was William Holmes. According to his daughter Charlotte, local native people gathered at their farm each season to catch and dry their winter supplies of salmon . She remembers that the salmon runs were so huge on the Brunette River that the fish actually crowded each other out of

252-473: A de jure sovereignty over the area. In 1669, the district around Puerto Deseado was explored by John Davis and was claimed in 1670 by Sir John Narborough for King Charles II of England , but the English made no attempt to establish settlements or explore the interior. The first European explorers of Patagonia observed that the indigenous people in the region were taller than the average Europeans of

378-506: A common ancestor . The Eocene salmon's fossil from British Columbia provides evidence that the divergence between Pacific and Atlantic salmon had not yet occurred 40 million years ago. Both the fossil record and analysis of mitochondrial DNA suggest the divergence occurred 10 to 20 million years ago during the Miocene . This independent evidence from DNA analysis and the fossil record indicate that salmon divergence occurred long before

504-859: A dissected topography . The Antarctic Plate started to subduct beneath South America 14 million years ago in the Miocene, forming the Chile Triple Junction . At first, the Antarctic Plate subducted only in the southernmost tip of Patagonia, meaning that the Chile Triple Junction was located near the Strait of Magellan . As the southern part of the Nazca Plate and the Chile Rise became consumed by subduction,

630-522: A Patagonian landscape; the presence of austral parakeets ( Enicognathus ferrugineus ) as far south as the shores of the strait attracted the attention of the earlier navigators, and green-backed firecrowns ( Sephanoides sephaniodes ), a species of hummingbird , may be seen flying amid the snowfall. One of the largest birds in the world, the Andean condor ( Vultur gryphus ) can be seen in Patagonia. Of

756-419: A derivation meaning "land of the big feet". However, this etymology is questionable. The term is most likely derived from an actual character name, "Patagón", a savage creature confronted by Primaleón of Greece, the hero in the homonymous Spanish chivalry novel (or knight-errantry tale ) by Francisco Vázquez. This book, published in 1512, was the sequel of the romance Palmerín de Oliva ;it was much in vogue at

882-560: A difficult winter at what he named Puerto San Julián before resuming its voyage further south on 21 August 1520. During this time, it encountered the local inhabitants, likely to be Tehuelche people , described by his reporter, Antonio Pigafetta, as giants called Patagons . The territory became the Spanish colony of the Governorate of New Léon, granted in 1529 to Governor Simón de Alcazaba y Sotomayor  [ es ] , part of

1008-442: A few species of salmon remain in fresh water throughout their life cycle, the majority are anadromous and migrate to the ocean for maturation: in these species, smolts spend a portion of their out-migration time in brackish water, where their body chemistry becomes accustomed to osmoregulation in the ocean. This body chemistry change is hormone-driven, causing physiological adjustments in the function of osmoregulatory organs such as

1134-477: A fish returns after just one year's sea feeding, it is called a grilse in Canada, Britain, and Ireland. Grilse may be present at spawning, and go unnoticed by large males, releasing their own sperm on the eggs. Prior to spawning, depending on the species , salmon undergo changes. They may grow a hump, develop canine-like teeth, or develop a kype (a pronounced curvature of the jaws in male salmon). All change from

1260-706: A future in aquaculture that eliminates the need for land, freshwater, or fertilizer to raise fish. Salmon population levels are of concern in the Atlantic and in some parts of the Pacific. The population of wild salmon declined markedly in recent decades, especially North Atlantic populations, which spawn in the waters of western Europe and eastern Canada, and wild salmon in the Snake and Columbia River systems in northwestern United States. Patagonia Patagonia ( Spanish pronunciation: [pataˈɣonja] )

1386-569: A high demand for wild forage fish . As a predator, salmon require large nutritional intakes of protein , and farmed salmon consume more fish than they generate as a final product. On a dry weight basis, 2–4 kg of wild-caught fish are needed to produce one kilogram of salmon. As the salmon farming industry expands, it requires more forage fish for feed, at a time when 75% of the world's monitored fisheries are already near to or have exceeded their maximum sustainable yield . The industrial-scale extraction of wild forage fish for salmon farming affects

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1512-765: A horseriding lifestyle. While the interest of the Spanish Empire had been chiefly to keep other European powers away from Patagonia, independent Chile and Argentina began to colonize the territory slowly over the course of the 19th and early 20th centuries. This process brought a decline of the indigenous populations, whose lives and habitats were disrupted, while at the same time thousands of Europeans, Argentines, Chilotes and mainland Chileans settled in Patagonia. The contemporary economy of eastern Patagonia revolves around sheep farming and oil and gas extraction, while in western Patagonia fishing , salmon aquaculture , and tourism dominate. The name Patagonia comes from

1638-649: A hunter-gathered lifestyle. The indigenous peoples of the region included the Tehuelches , whose numbers and society were reduced to near extinction not long after the first contacts with Europeans. Tehuelches included the Gununa'kena to the north, Mecharnuekenk in south-central Patagonia, and the Aonikenk or Southern Tehuelche in the far south, north of the Magellan strait. On Isla Grande de Tierra del Fuego ,

1764-548: A lot of work on Henneguya salminicola was done by scientists at the Pacific Biological Station in Nanaimo in the mid-1980s, in particular, an overview report which states, "the fish that have the longest fresh water residence time as juveniles have the most noticeable infections. Hence in order of prevalence , coho are most infected followed by sockeye, chinook, chum and pink. As well, the report says, at

1890-609: A part of the Los Lagos Region , is also located within Patagonia. By some definitions, Chiloé Archipelago, the rest of the Los Lagos Region, and part of the Los Ríos Region are also part of Patagonia. Patagonia's climate is mostly cool and dry year round. The east coast is warmer than the west, especially in summer, as a branch of the southern equatorial current reaches its shores, whereas the west coast

2016-422: A region of steppe -like plains, rising in a succession of 13 abrupt terraces about 100 m (330 ft) at a time, and covered with an enormous bed of shingle almost bare of vegetation. In the hollows of the plains are ponds or lakes of fresh and brackish water. Towards Chilean territory, the shingle gives way to porphyry , granite , and basalt lavas, and animal life becomes more abundant. Vegetation

2142-754: A site for the conservation of marine mammals . The Patagonian freshwater fish fauna is relatively restricted compared to other similar Southern Hemisphere regions. The Argentine part is home to a total of 29 freshwater fish species, 18 of which are native. The introduced are several species of trout , common carp , and various species that originated in more northerly parts of South America. The natives are osmeriforms ( Aplochiton and Galaxias ), temperate perches ( Percichthys ), catfish ( Diplomystes , Hatcheria and Trichomycterus ), Neotropical silversides ( Odontesthes ) and characiforms ( Astyanax , Cheirodon , Gymnocharacinus , and Oligosarcus ). Other Patagonian freshwater fauna include

2268-412: A technically demanding kind of sport fishing , not necessarily intuitive for beginning fishermen. A conflict exists between commercial fishermen and recreational fishermen for the right to salmon stock resources . Commercial fishing in estuaries and coastal areas is often restricted so enough salmon can return to their natal rivers where they can spawn and be available for sport fishing. On parts of

2394-472: A temperature of −25   °C has been recorded in Bariloche, and most places can often have temperatures between −12 and −15   °C and highs staying around 0   °C for a few days. Directly east of these areas, the weather becomes much harsher; precipitation drops to between 150 and 300 mm, the mountains no longer protect the cities from the wind, and temperatures become more extreme. Maquinchao

2520-636: Is a unitary state , its first-level administrative divisions—the regions—enjoy far less autonomy than analogous Argentine provinces. Argentine provinces have elected governors and legislatures, while Chilean regions had government-appointed intendants prior to the adoption of elected governors from 2021. The Patagonian Provinces of Argentina are Neuquén , Río Negro , Chubut , Santa Cruz , and Tierra del Fuego . The southernmost part of Buenos Aires Province can also be considered part of Patagonia. The two Chilean regions undisputedly located entirely within Patagonia are Aysén and Magallanes . Palena Province ,

2646-484: Is a few hundred kilometers east of Bariloche, at the same altitude on a plateau, and summer daytime temperatures are usually about 5   °C warmer, rising up to 35   °C sometimes, but winter temperatures are much more extreme: the record is −35   °C, and some nights not uncommonly reach 10   °C colder than Bariloche. The plateaus in Santa Cruz province and parts of Chubut usually have snow cover through

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2772-644: Is a geographical region that encompasses the southern end of South America , governed by Argentina and Chile . The region comprises the southern section of the Andes Mountains with lakes, fjords , temperate rainforests , and glaciers in the west and deserts , tablelands , and steppes to the east. Patagonia is bounded by the Pacific Ocean on the west, the Atlantic Ocean to the east, and many bodies of water that connect them, such as

2898-858: Is a major contributor to the world production of farmed finfish, representing about US$ 10 billion annually. Other commonly cultured fish species include tilapia , catfish , sea bass , carp and bream . Salmon farming is significant in Chile , Norway , Scotland , Canada and the Faroe Islands ; it is the source for most salmon consumed in the United States and Europe. Atlantic salmon are also, in very small volumes, farmed in Russia and Tasmania , Australia. Salmon are carnivorous , and need to be fed meals produced from catching other wild forage fish and other marine organisms. Salmon farming leads to

3024-505: Is called "Camwy" in Patagonian Welsh. Chupat, Chubut and Camwy have the same meaning and are used to talk about the river and the province. Welsh settlers and placenames are associated with one of the projects of the country of Wales, Project Hiraeth. Due to the language, culture and location, many Patagonians do not consider themselves Latinos and proudly call themselves Patagonians instead. People from Y Wladfa, Laurie Island,

3150-497: Is caused principally by the sudden melting and retreat of ice aided by tectonic changes, has scooped out a deep longitudinal depression, best in evidence where in contact with folded Cretaceous rocks, which are lifted up by the Cenozoic granite. It generally separates the plateau from the first lofty hills, whose ridges are generally called the pre-Cordillera. To the west of these, a similar longitudinal depression extends all along

3276-680: Is derived from Middle English : samoun , samon and saumon , which in turn are from Anglo-Norman : saumon , from Old French : saumon , and from Latin : salmō (which in turn might have originated from salire , meaning "to leap". ). The unpronounced "l" absent from Middle English was later added as a Latinisation to make the word closer to its Latin root. The term salmon has mostly displaced its now dialectal synonym lax , in turn from Middle English : lax , from Old English : leax , from Proto-Germanic : * lahsaz from Proto-Indo-European : *lakso- . The seven commercially important species of salmon occur in two genera of

3402-490: Is more luxuriant, consisting principally of southern beech and conifers . The high rainfall against the western Andes ( Wet Andes ) and the low sea-surface temperatures offshore give rise to cold and humid air masses, contributing to the ice fields and glaciers , the largest ice fields in the Southern Hemisphere outside of Antarctica. Among the depressions by which the plateau is intersected transversely,

3528-441: Is quite high (perhaps as high as 40 to 50%). To lay her roe , the female salmon uses her tail (caudal fin), to create a low-pressure zone, lifting gravel to be swept downstream, excavating a shallow depression, called a redd. The redd may sometimes contain 5,000 eggs covering 2.8 m (30 sq ft). The eggs usually range from orange to red. One or more males approach the female in her redd, depositing sperm, or milt, over

3654-966: Is strictly a fish parasite that cannot live in or affect warm blooded animals, including man". According to Klaus Schallie, Molluscan Shellfish Program Specialist with the Canadian Food Inspection Agency , " Henneguya salminicola is found in southern B.C. also and in all species of salmon. I have previously examined smoked chum salmon sides that were riddled with cysts and some sockeye runs in Barkley Sound (southern B.C., west coast of Vancouver Island ) are noted for their high incidence of infestation." Sea lice , particularly Lepeophtheirus salmonis and various Caligus species, including C. clemensi and C. rogercresseyi , can cause deadly infestations of both farm-grown and wild salmon. Sea lice are ectoparasites which feed on mucus, blood, and skin, and migrate and latch onto

3780-488: Is the common name for several commercially important species of euryhaline ray-finned fish from the genera Salmo and Oncorhynchus of the family Salmonidae , native to tributaries of the North Atlantic ( Salmo ) and North Pacific ( Oncorhynchus ) basins. Other closely related fish in the same family include trout , char , grayling , whitefish , lenok and taimen , all coldwater fish of

3906-480: Is under development in Alaska . There, the young salmon are released into the ocean far from any wild salmon streams. When it is time for them to spawn, they return to where they were released, where fishermen can catch them. An alternative method to hatcheries is to use spawning channels. These are artificial streams , usually parallel to an existing stream, with concrete or rip-rap sides and gravel bottoms. Water from

Brunette River - Misplaced Pages Continue

4032-641: Is very scarce. The weather only gets a bit colder further south in Chubut, and the city of Comodoro Rivadavia has summer temperatures of 24 to 28   °C, nights of 12 to 16   °C, and winters with days around 10   °C and nights around 3   °C, and less than 250 mm of rain. However, a drastic drop occurs as one moves south to Santa Cruz; Rio Gallegos, in the south of the province, has summer temps of 17 to 21   °C, (nights between 6 and 10   °C) and winter temperatures of 2 to 6   °C, with nights between −5 and 0   °C, despite being right on

4158-460: Is washed by a cold current. However, winters are colder on the inland plateaus east of the slopes and further down the coast on the southeast end of the Patagonian region. For example, at Puerto Montt , on the inlet behind Chiloé Island, the mean annual temperature is 11 °C (52 °F) and the average extremes are 25.5 and −1.5 °C (77.9 and 29.3 °F), whereas at Bahía Blanca near

4284-624: The Cook Inlet Aquaculture Association , as a way to increase salmon populations in situations where they have declined due to overharvesting , construction of dams and habitat destruction or fragmentation . Negative consequences to this sort of population manipulation include genetic "dilution" of the wild stocks. Many jurisdictions are now beginning to discourage supplemental fish planting in favour of harvest controls, and habitat improvement and protection. A variant method of fish stocking , called ocean ranching,

4410-577: The Cuncos (also known as Veliches) settled in Chiloé Island in Pre-Hispanic times as a consequence of a push from more northern Huilliches who in turn were being displaced by Mapuches . While being outside traditional Huilliche territory the western Patagonian volcanoes Michimahuida , Hornopirén and Chaitén have Huilliche etymologies. In Chubut Province modern toponymy comes from

4536-803: The Early Holocene (c. 9000 years BP ) much in the same way that Riesco Island was back then. A Selk'nam tradition recorded by the Salesian missionary Giuseppe María Beauvoir relate that the Selk'nam arrived in Tierra del Fuego by land, and that the Selk'nam were later unable to return north as the sea had flooded their crossing. Agriculture was practised in Pre-Hispanic Argentina as far south as southern Mendoza Province . Agriculture

4662-667: The Governorates of the Spanish Empire of the Americas. The territory was redefined in 1534 and consisted of the southernmost part of the South American continent and the islands towards Antarctica. Rodrigo de Isla , sent inland in 1535 from San Matías by Simón de Alcazaba y Sotomayor (on whom western Patagonia had been conferred by Charles I of Spain , is presumed to have been the first European to have traversed

4788-489: The Japanese word for trout. On the other hand, the steelhead and sea trout , the anadromous forms of rainbow trout and brown trout respectively, are from the same genera as salmon and live identical migratory lives, but neither is termed "salmon" . The extinct Eosalmo driftwoodensis , the oldest known Salmoninae fish in the fossil record , helps scientists figure how the different species of salmon diverged from

4914-526: The Pacific Northwest and Alaska , salmon are keystone species . The migration of salmon represent a massive retrograde nutrient transfer, rich in nitrogen , sulfur , carbon and phosphorus , from the ocean to the inland freshwater ecosystems . Predation by piscivorous land animals (such as ospreys , bears and otters ) along the journey serve to transfer the nutrients from the water to land, and decomposition of salmon carcass benefits

5040-461: The Pacific coast of Canada , the louse-induced mortality of pink salmon in some regions is commonly over 80%. The risk of injury caused by underwater pile driving has been studied by Dr. Halvorsen and her co-workers. The study concluded that the fish are at risk of injury if the cumulative sound exposure level exceeds 210 dB relative to 1 μPa s. As can be seen from the production chart at

5166-522: The Patagonian mara ( Dolichotis patagonum ) are also characteristic of the steppe and the pampas to the north. The fauna of Patagonia was heavily decimated by the end-Pleistocene extinction event around 12-10,000 years ago that resulted in the extinction of most large ( megafaunal ) animal species native to the region (as well as across the Americas). Species formerly present in the region include

Brunette River - Misplaced Pages Continue

5292-514: The Quaternary glaciation began the cycle of glacial advance and retreat. There are several other species of fish which are colloquially called "salmon" but are not true salmon. Of those listed below, the Danube salmon or huchen is a large freshwater salmonid closely related (from the same subfamily) to the seven species of salmon above, but others are fishes of unrelated orders , given

5418-672: The Salmo and Oncorhynchus genera also contain a number of trout species informally referred to as salmon. Within Salmo , the Adriatic salmon ( Salmo obtusirostris ) and Black Sea salmon ( Salmo labrax ) have both been named as salmon in English , although they fall outside the generally recognized seven salmon species. The masu salmon ( Oncorhynchus masou ) is actually considered a trout ("cherry trout") in Japan , with masu actually being

5544-506: The Selk'nam (Ona) and Haush (Manek'enk) lived in the north and southeast, respectively. In the archipelagos to the south of Tierra del Fuego were Yámana, with the Kawéskar (Alakaluf) in the coastal areas and islands in western Tierra del Fuego and the southwest of the mainland. In the Patagonian archipelagoes north of Taitao Peninsula lived the Chonos . These groups were encountered in

5670-694: The Strait of Magellan , the Beagle Channel , and the Drake Passage to the south. The Colorado and Barrancas rivers, which run from the Andes to the Atlantic, are commonly considered the northern limit of Argentine Patagonia. The archipelago of Tierra del Fuego is sometimes included as part of Patagonia. Most geographers and historians locate the northern limit of Chilean Patagonia at Huincul Fault , in Araucanía Region . At

5796-581: The Yagagtoo , Musters , and Colhue Huapi , and others situated to the south of Puerto Deseado in the center of the country. Across much of Patagonia east of the Andes, volcanic eruptions have created formation of basaltic lava plateaus during the Cenozoic . The plateaus are of different ages with the older –of Neogene and Paleogene age– being located at higher elevations than Pleistocene and Holocene lava plateaus and outcrops. Erosion, which

5922-497: The forest ecosystem . In the case of Pacific salmon , most (if not all) of the salmon that survive to reach the headwater spawning grounds will die after laying eggs and their dead bodies sink to cover the gravel beds, with the nutrients released from the biodegradation of their corpses providing a significant boost to these otherwise biomass -poor shallow streams. Grizzly bears function as ecosystem engineers , capturing salmon and carrying them into adjacent dry land to eat

6048-524: The myrtle zone . These dams can be overtopped at high tide and hold water at low tide. This provides refuges for juvenile salmon so they do not have to swim into large channels where they are subject to predation by larger fish. It has been discovered that rivers which have seen a decline or disappearance of anadromous lampreys , loss of the lampreys also affects the salmon in a negative way. Like salmon, anadromous lampreys stop feeding and die after spawning, and their decomposing bodies release nutrients into

6174-590: The otolith (annuli), analogous to the growth rings visible in a tree trunk. Freshwater growth shows as densely crowded rings, sea growth as widely spaced rings; spawning is marked by significant erosion as body mass is converted into eggs and milt. Freshwater streams and estuaries provide important habitat for many salmon species. They feed on terrestrial and aquatic insects , amphipods , and other crustaceans while young, and primarily on other fish when older. Eggs are laid in deeper water with larger gravel and need cool water and good water flow (to supply oxygen) to

6300-563: The patagon personage in the chivalric romances Primaleon printed in 1512, ten years before Magellan arrived in these southern lands. This hypothesis was published in a 2011 New Review of Spanish Philology report. There are various placenames in the Chiloé Archipelago with Chono etymologies despite the main indigenous language of the archipelago at the arrival of the Spanish being Mapudungun . A theory postulated by chronicler José Pérez García explains this holding that

6426-616: The subarctic and cooler temperate regions with some sporadic endorheic populations in Central Asia . Salmon are typically anadromous : they hatch in the shallow gravel beds of freshwater headstreams and spend their juvenile years in rivers , lakes and freshwater wetlands , migrate to the ocean as adults and live like sea fish , then return to their freshwater birthplace to reproduce . However, populations of several species are restricted to fresh waters (i.e. landlocked) throughout their lives. Folklore has it that

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6552-792: The subfamily Salmoninae . The genus Salmo contains the Atlantic salmon , found in both sides of the North Atlantic , as well as more than 40 other species commonly named as trout . The genus Oncorhynchus contains 12 recognised species which occur naturally only in the North Pacific, six of which are known as Pacific salmon while the remainder are considered trout. Outside their native habitats, Chinook salmon have been successfully introduced in New Zealand and Patagonia , while coho , sockeye and Atlantic salmon have been established in Patagonia, as well.     Both

6678-611: The 40th parallel, they found a "land" or a "point extending into the sea", and further south, a gulf. The expedition is said to have rounded the gulf for nearly 300 km (186 mi) and sighted the continent on the southern side of the gulf. The Atlantic coast of Patagonia was first fully explored in 1520 by the Spanish expedition led by Ferdinand Magellan , who on his passage along the coast named many of its more striking features – San Matías Gulf, Cape of 11,000 Virgins (now simply Cape Virgenes ), and others. Magellan's fleet spent

6804-676: The Atlantic Islands, Antarctica (including the Chilean town in Antarctica, "The Stars Village", and the Argentine civilian settlement, "Hope Base"), other non-latin speaking areas use this term as a patriotic and inclusive demonym. A Patagonian is a person that is part of the Patagonia region, language and culture. That person could be a citizen from Chilean Patagonia, Argentine Patagonia, or of native communities that existed before

6930-431: The Atlantic coast and just outside the northern confines of Patagonia, the annual temperature is 15 °C (59 °F) and the range much greater, as temperatures above 35   °C and below −5   °C are recorded every year. At Punta Arenas, in the extreme south, the mean temperature is 6 °C (43 °F) and the average extremes are 24.5 and −2 °C (76.1 and 28.4 °F). The prevailing winds are westerly, and

7056-478: The Atlantic coast of Patagonia. The geological limit of Patagonia has been proposed to be Huincul Fault , which forms a major discontinuity. The fault truncates various structures including the Pampean orogen found further north. The ages of base rocks change abruptly across the fault. Discrepancies have been mentioned among geologists on the origin of the Patagonian landmass. Víctor Ramos has proposed that

7182-400: The Atlantic coast, through the Strait of Magellan and northward along the Pacific coast, was memorable, yet the descriptions of the geography of Patagonia owe much more to the Spanish explorer Pedro Sarmiento de Gamboa (1579–1580), who, devoting himself especially to the south-west region, made careful and accurate surveys. The settlements that he founded at Nombre de Jesús and San Felipe

7308-479: The North American West Coast salmon sport fishing has completely replaced inshore commercial salmon fishing. In most cases, the commercial value of a salmon sold as seafood can be several times less than the value attributed to the same fish caught by a sport fisherman. This is "a powerful economic argument for allocating stock resources preferentially to sport fishing". Salmon aquaculture

7434-570: The Pacific Ocean, the second host releases a stage infective to salmon. The parasite is then carried in the salmon until the next spawning cycle. The myxosporean parasite that causes whirling disease in trout has a similar life cycle. However, as opposed to whirling disease, the Henneguya infestation does not appear to cause disease in the host salmon—even heavily infected fish tend to return to spawn successfully. According to Dr. Kieser,

7560-554: The Patagonian landmass originated as an allochthonous terrane that separated from Antarctica and docked in South America 250 to 270 Mya in the Permian period. A 2014 study by R.J. Pankhurst and coworkers rejects any idea of a far-traveled Patagonia, claiming it is likely of parautochtonous (nearby) origin. The Mesozoic and Cenozoic deposits have revealed a most interesting vertebrate fauna. This, together with

7686-422: The Patagonian plains. The Patagonian steppe is one of the last strongholds of the guanaco and Darwin's rheas ( Rhea pennata ), which had been hunted for their skins by the Tehuelches , on foot using boleadoras , before the diffusion of firearms and horses ; they were formerly the chief means of subsistence for the natives, who hunted them on horseback with dogs and bolas . Vizcachas ( Lagidum spp.) and

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7812-432: The adjacent stream is piped into the top of the channel, sometimes via a header pond, to settle out sediment. Spawning success is often much better in channels than in adjacent streams due to the control of floods, which in some years can wash out the natural redds. Because of the lack of floods, spawning channels must sometimes be cleaned out to remove accumulated sediment. The same floods that destroy natural redds also clean

7938-796: The border with Chile, receives up to 434 mm of rain and snow in May, 297 mm in June, and 273 in July, compared to 80 in February and 72 in March. The total for the city is 2074 mm, making it one of the rainiest in Argentina. Further west, some areas receive up to 4,000 mm and more, especially on the Chilean side. In the northeast, the seasons for rain are reversed; most rain falls from occasional summer thunderstorms but totals barely reach 500 mm in

8064-592: The coast in the north but happens more often in the south, and frost is usually not very intense. Immediately east from the coast are the Andes, cut by deep fjords in the south and by deep lakes in the north, and with varying temperatures according to the altitude. The tree line ranges from close to 2,000 m on the northern side (except for the Andes in northern Neuquén in Argentina, where sunnier and dryer conditions allow trees to grow up to close to 3,000 m), and diminishes southward to only 600–800   m in Tierra del Fuego. Precipitation changes dramatically from one spot to

8190-420: The coast. Snowfall is common despite the dryness, and temperatures are known to fall to under −18   °C and to remain below freezing for several days in a row. Rio Gallegos is also among the windiest places on Earth, with winds reaching 100 km/h occasionally. Tierra del Fuego is extremely wet in the west, relatively damp in the south, and dry in the north and east. Summers are cool (13 to 18   °C in

8316-491: The coastline of Patagonia is possibly mentioned in a Portuguese voyage in 1511–1512, traditionally attributed to captain Diogo Ribeiro, who after his death was replaced by Estevão de Frois, and was guided by the pilot and cosmographer João de Lisboa ). The explorers, after reaching Rio de la Plata (which they would explore on the return voyage, contacting the Charrúa and other peoples) eventually reached San Matias Gulf , at 42°S. The expedition reported that after going south of

8442-608: The common name "salmon" simply due to similar shapes, behaviors and niches occupied: Salmon eggs are laid in freshwater streams typically at high latitudes. The eggs hatch into alevin or sac fry. The fry quickly develop into parr with camouflaging vertical stripes. The parr stay for six months to three years in their natal stream before becoming smolts, which are distinguished by their bright, silvery colour with scales that are easily rubbed off. Only 10% of all salmon eggs are estimated to survive to this stage. The smolt body chemistry changes, allowing them to live in salt water. While

8568-537: The details of which are as yet poorly understood. Several sites have been excavated, notably caves such as Cueva del Milodon in Última Esperanza in southern Patagonia, and Tres Arroyos on Tierra del Fuego, that support this date. Hearths, stone scrapers, and animal remains dated to 9400–9200 BC have been found east of the Andes. At the close of the Pleistocene around 12-11,000 years ago (10,000-9,000 BC) Fishtail projectile points (a type of knapped stone spear point) were widespread across Patagonia (along with much of

8694-430: The developing embryos. Mortality of salmon in the early life stages is usually high due to natural predation and human-induced changes in habitat, such as siltation, high water temperatures, low oxygen concentration, loss of stream cover, and reductions in river flow. Estuaries and their associated wetlands provide vital nursery areas for the salmon prior to their departure to the open ocean. Wetlands not only help buffer

8820-405: The discovery of the perfect cranium of a turtle ( chelonian ) of the genus Niolamia , which is almost identical to Ninjemys oweni of the Pleistocene age in Queensland , forms an evident proof of the connection between the Australian and South American continents. The Patagonian Niolamia belongs to the Sarmienti Formation. Fossils of the mid-Cretaceous Argentinosaurus , which may be

8946-472: The elimination of beavers from large parts of the river system, salmon runs plummeted, even in the absence of many of the factors usually associated with the demise of salmon runs. Salmon recruitment can be affected by beavers' dams because dams can: Beaver dams are able to nurture salmon juveniles in estuarine tidal marshes where the salinity is less than 10 ppm. Beavers build small dams of generally less than 60 cm (2 ft) high in channels in

9072-821: The estuary from silt and pollutants, but also provide important feeding and hiding areas. Salmon not killed by other means show greatly accelerated deterioration ( phenoptosis , or "programmed aging") at the end of their lives. Their bodies rapidly deteriorate right after they spawn as a result of the release of massive amounts of corticosteroids . Salmon are mid- level carnivores whose diet change according to their life stage. Salmon fry predominantly feed upon zooplanktons until they reach fingerling sizes, when they start to consume more aquatic invertebrates such as insect larvae , micro crustaceans and worms . As juveniles (parrs), they become more predatory and actively prey upon aquatic insects , small crustaceans, tadpoles and small bait fishes . They are also known to breach

9198-399: The first periods of European contact with different lifestyles, body decoration, and language, although it is unclear when this configuration emerged. Towards the end of the 16th century, Mapuche -speaking agriculturalists penetrated the western Andes and from there across into the eastern plains and down to the far south. Through confrontation and technological ability, they came to dominate

9324-432: The fish return to the exact stream where they themselves hatched to spawn , and tracking studies have shown this to be mostly true. A portion of a returning salmon run may stray and spawn in different freshwater systems; the percent of straying depends on the species of salmon. Homing behavior has been shown to depend on olfactory memory . Salmon are important food fish and are intensively farmed in many parts of

9450-443: The fish. There they deposit nutrient-rich urine and feces and partially eaten carcasses. Bears preparing for hibernation tend to preferentially consume the more nutrient- and energy -rich salmon roes and brain over the actual flesh , and are estimated to discard up to half the salmon they've harvested uneaten on the forest floor, in densities that can reach 4,000 kg (8,800 lb) per hectare, providing as much as 24% of

9576-467: The foot of the snowy Andean Cordillera. This latter depression contains the richest, most fertile land of Patagonia. Lake basins along the Cordillera were also gradually excavated by ice streams, including Lake Argentino and Lake Fagnano , as well as coastal bays such as Bahía Inútil . The establishment of dams near the Andes in Argentina in the 20th century has led to a sediment shortage along

9702-566: The gills, which leads to large increases in their ability to secrete salt. Hormones involved in increasing salinity tolerance include insulin-like growth factor I , cortisol , and thyroid hormones , which permits the fish to endure the transition from a freshwater environment to the ocean. The salmon spend about one to five years (depending on the species) in the open ocean, where they gradually become sexually mature. The adult salmon then return primarily to their natal streams to spawn. Atlantic salmon spend between one and four years at sea. When

9828-500: The great Patagonian plain. If the men under his charge had not mutinied, he might have crossed the Andes to reach the Pacific coast. Pedro de Mendoza , on whom the country was next bestowed, founded Buenos Aires , but did not venture south. Alonso de Camargo  [ es ] (1539), Juan Ladrilleros (1557), and Hurtado de Mendoza (1558) helped to make known the Pacific coasts, and while Sir Francis Drake 's voyage in 1577 down

9954-748: The highly unusual aeglid crustaceans. Human habitation of the region dates back thousands of years, with some early archaeological findings in the area dated to at least the 13th millennium BC , although later dates around the 10th millennium BC are more securely recognized. Evidence exists of human activity at Monte Verde in Llanquihue Province , Chile, dated to around 14,500 years Before Present (~12,500 BC). The glacial-period ice fields and subsequent large meltwater streams would have made settlement difficult at that time. The region seems to have been inhabited continuously since 10,000 BC by various cultures and alternating waves of migration,

10080-467: The land was divided by The Boundary Treaty of 1881 . Patagonia is divided between Western Patagonia (Chile) and Eastern Patagonia (Argentina) and several territories are still under dispute and claiming their rights. Mapuche people came from the Chilean Andes and voted to remain in different sides of Patagonia. Welsh settlers came from Wales and North America and voted to remain in Patagonia; when

10206-496: The large cow-sized ground sloth Mylodon , the large camel-like ungulate Macrauchenia , indigenous equines belonging to the genus Hippidion , the giant short-faced bear Arctotherium , and the large sabertooth cat Smilodon . The extinct fox Dusicyon avus (a close relative of the Falkland Islands wolf ) also formerly inhabited the region, until apparently becoming extinct around 500-400 years ago. Patagonia

10332-521: The largest of all dinosaurs, have been found in Patagonia, and a model of the mid- Jurassic Piatnitzkysaurus graces the concourse of the Trelew airport (the skeleton is in the Trelew paleontological museum; the museum's staff has also announced the discovery of a species of dinosaur even bigger than Argentinosaurus ). Of more than paleontological interest, the middle Jurassic Los Molles Formation and

10458-684: The left, the global capture reported by different countries to the FAO of commercial wild salmon has remained fairly steady since 1990 at about one million tonnes per year. This is in contrast to farmed salmon (below) which has increased in the same period from about 0.6 million tonnes to well over two million tonnes. Nearly all captured wild salmon are Pacific salmon . The capture of wild Atlantic salmon has always been relatively small, and has declined steadily since 1990. In 2011 only 2,500 tonnes were reported. In contrast, about half of all farmed salmon are Atlantic salmon. Recreational salmon fishing can be

10584-458: The longer the fish remain in fresh water, and they then deteriorate further after they spawn, when they are known as kelts. In all species of Pacific salmon, the mature individuals die within a few days or weeks of spawning, a trait known as semelparity . Between 2 and 4% of Atlantic salmon kelts survive to spawn again, all females. However, even in those species of salmon that may survive to spawn more than once ( iteroparity ), postspawning mortality

10710-553: The many kinds of waterfowl the Chilean flamingo ( Phoenicopterus chilensis ), the upland goose ( Chloephaga picta ), and in the strait, the remarkable steamer ducks are found. Signature marine fauna include the southern right whale , the Magellanic penguin ( Spheniscus magellanicus ), the killer whale , and elephant seals . The Valdés Peninsula is a UNESCO World Heritage Site , designated for its global significance as

10836-837: The more northerly regions of the Antarctic Plate began to subduct beneath Patagonia so that the Chile Triple Junction advanced to the north over time. The asthenospheric window associated to the triple junction disturbed previous patterns of mantle convection beneath Patagonia inducing an uplift of c. 1 km that reversed the Miocene transgression. At a state level, Patagonia visually occupies an area within two countries: approximately 10% in Chile and approximately 90% in Argentina . Both countries have organized their Patagonian territories into nonequivalent administrative subdivisions: provinces and departments in Argentina, as well as regions , provinces , and communes in Chile. As Chile

10962-448: The north, 12 to 16   °C in the south, with nights generally between 3 and 8   °C), cloudy in the south, and very windy. Winters are dark and cold, but without the extreme temperatures in the south and west ( Ushuaia rarely reaches −10   °C, but hovers around 0   °C for several months, and snow can be heavy). In the east and north, winters are much more severe, with cold snaps bringing temperatures down to −20   °C all

11088-411: The northeast corner, and rapidly decrease to less than 300 mm. The Patagonian west coast, which belongs exclusively to Chile, has a cool oceanic climate, with summer maximum temperatures ranging from 14   °C in the south to 19   °C in the north (and nights between 5 and 11   °C) and very high precipitation, from 2,000 to more than 7,000 mm in local microclimates. Snow is uncommon at

11214-476: The other and diminishes very quickly eastward. An example of this is Laguna Frías, in Argentina, which receives 4,400 mm yearly. The city of Bariloche, about 40 km further east, receives about 1,000 mm, and the airport, another 15 km east, receives less than 600 mm. The easterly slopes of the Andes are home to several Argentine cities: San Martín de los Andes , Bariloche, El Bolsón , Esquel , and El Calafate . Temperatures there are milder in

11340-535: The other peoples of the region in a short period of time, and are the principal indigenous community today. Navigators such as Gonçalo Coelho and Amerigo Vespucci possibly had reached the area (his own account of 1502 has it that they reached the latitude 52°S), but Vespucci's failure to accurately describe the main geographical features of the region such as the Río de la Plata casts doubts on whether they really did so. The first or more detailed description of part of

11466-446: The parasitic infection into a number of cysts that contain milky fluid. This fluid is an accumulation of a large number of parasites. Henneguya and other parasites in the myxosporean group have complex life cycles, where the salmon is one of two hosts. The fish releases the spores after spawning. In the Henneguya case, the spores enter a second host, most likely an invertebrate, in the spawning stream. When juvenile salmon migrate to

11592-526: The preferred prey of seals and sea lions, which can eat 30 lampreys to every salmon, allowing more adult salmon to enter the rivers to spawn without being eaten by the marine mammals. According to Canadian biologist Dorothy Kieser, the myxozoan parasite Henneguya salminicola is commonly found in the flesh of salmonids. It has been recorded in the field samples of salmon returning to the Haida Gwaii Islands . The fish responds by walling off

11718-835: The principal ones are the Gualichu , south of the Río Negro , the Maquinchao and Valcheta (through which previously flowed the waters of Nahuel Huapi Lake , which now feed the Limay River), the Senguerr (spelled Senguer on most Argentine maps and within the corresponding region), and the Deseado River . Besides these transverse depressions (some of them marking lines of ancient interoceanic communication), others were occupied by either more or less extensive lakes, such as

11844-408: The problems of rising costs for buying hatchery fish feed . Yet another attractive alternative is the increased use of seaweed . Seaweed provides essential minerals and vitamins for growing organisms. It offers the advantage of providing natural amounts of dietary fiber and having a lower glycemic load than grain-based fish meal . In the best-case scenario, widespread use of seaweed could yield

11970-462: The region, apparently hunting of guanaco, and to a lesser extent rhea ( ñandú ), were the primary food sources of tribes living on the eastern plains. It is also not clear if domestic dogs were part of early human activity. Bolas are commonly found and were used to catch guanaco and rhea . A maritime tradition existed along the Pacific coast, whose latest exponents were the Yaghan (Yámana) to

12096-466: The regular streams. Spawning channels preserve the natural selection of natural streams, as there is no benefit, as in hatcheries, to use prophylactic chemicals to control diseases. Farm-raised salmon are fed the carotenoids astaxanthin and canthaxanthin to match their flesh colour to wild salmon to improve their marketability. Wild salmon get these carotenoids , primarily astaxanthin, from eating shellfish and krill . One proposed alternative to

12222-451: The rest of South America). At several sites these points have been found associated with extinct megafauna, including the large ground sloth Mylodon and the native equine Hippidion . The Cueva de las Manos is a famous site in Santa Cruz, Argentina. This cave at the foot of a cliff is covered in wall paintings, particularly the negative images of hundreds of hands, believed to date from around 8000 BC. Based on artifacts found in

12348-407: The roe. The female then covers the eggs by disturbing the gravel at the upstream edge of the depression before moving on to make another redd. The female may make as many as seven redds before her supply of eggs is exhausted. Each year, the fish experiences a period of rapid growth, often in summer, and one of slower growth, normally in winter. This results in ring formation around an earbone called

12474-509: The salmon population. This system is referred to as ranching . It was very common in countries such as Sweden, before the Norwegians developed salmon farming, but is seldom done by private companies. As anyone may catch the salmon when they return to spawn, a company is limited in benefiting financially from their investment. Because of this, the ranching method has mainly been used by various public authorities and non-profit groups, such as

12600-421: The silvery blue of a fresh-run fish from the sea to a darker colour. Salmon can make amazing journeys, sometimes moving hundreds of miles upstream against strong currents and rapids to reproduce. Chinook and sockeye salmon from central Idaho, for example, travel over 1,400 km (900 mi) and climb nearly 2,100 m (7,000 ft) from the Pacific Ocean as they return to spawn. Condition tends to deteriorate

12726-693: The singular mammal Pyrotherium , also of very large dimensions. In the Cenozoic marine formation, considerable numbers of cetaceans have been discovered. During the Oligocene and early Miocene , large swathes of Patagonia were subject to a marine transgression , which might have temporarily linked the Pacific and Atlantic Oceans, as inferred from the findings of marine invertebrate fossils of both Atlantic and Pacific affinity in La Cascada Formation . Connection would have occurred through narrow epicontinental seaways that formed channels in

12852-546: The skin of wild salmon during free-swimming, planktonic nauplii and copepodid larval stages, which can persist for several days. Large numbers of highly populated, open-net salmon farms can create exceptionally large concentrations of sea lice; when exposed in river estuaries containing large numbers of open-net farms, many young wild salmon are infected, and do not survive as a result. Adult salmon may survive otherwise critical numbers of sea lice, but small, thin-skinned juvenile salmon migrating to sea are highly vulnerable. On

12978-577: The south of Tierra del Fuego, the Kaweshqar between Taitao Peninsula and Tierra del Fuego, and the Chono people in the Chonos Archipelago . The Selk'nam , Haush , and Tehuelche are generally thought to be culturally and linguistically related peoples physically distinct from the sea-faring peoples. It is possible that Isla Grande de Tierra del Fuego was connected to the mainland in

13104-698: The still richer late Jurassic ( Tithonian ) and early Cretaceous ( Berriasian ) Vaca Muerta formation above it in the Neuquén basin are reported to contain huge hydrocarbon reserves (mostly gas in Los Molles, both gas and oil in Vaca Muerta) partly accessible through hydraulic fracturing . Other specimens of the interesting fauna of Patagonia, belonging to the Middle Cenozoic, are the gigantic wingless birds, exceeding in size any hitherto known, and

13230-458: The stream. Also, along with species like rainbow trout and Sacramento sucker , lampreys clean the gravel in the rivers during spawning. Their larvae, called ammocoetes, are filter feeders which contribute to the health of the waters. They are also a food source for the young salmon, and being fattier and oilier, it is assumed predators prefer them over salmon offspring, taking off some of the predation pressure on smolts. Adult lampreys are also

13356-494: The summer (in the north, between 20 and 24   °C, with cold nights between 4 and 9   °C; in the south, summers are between 16 and 20   °C, at night temperatures are similar to the north) and much colder in the winter, with frequent snowfall (although snow cover rarely lasts very long). Daytime highs range from 3 to 9   °C in the north, and from 0 to 7   °C in the south, whereas nights range from −5 to 2   °C everywhere. Cold waves can bring much colder values;

13482-534: The survivability of other wild predatory fish which rely on them for food. Research is ongoing into sustainable and plant-based salmon feeds. Intensive salmon farming uses open-net cages, which have low production costs. It has the drawback of allowing disease and sea lice to spread to local wild salmon stocks. Another form of salmon production, which is safer but less controllable, is to raise salmon in hatcheries until they are old enough to become independent. They are released into rivers in an attempt to increase

13608-419: The time of the Spanish arrival , Patagonia was inhabited by multiple indigenous tribes. In a small portion of northwestern Patagonia, indigenous peoples practiced agriculture, while in the remaining territory, peoples lived as hunter-gatherers, traveling by foot in eastern Patagonia or by dugout canoe and dalca in the fjords and channels . In colonial times indigenous peoples of northeastern Patagonia adopted

13734-496: The time the studies were conducted, stocks from the middle and upper reaches of large river systems in British Columbia such as Fraser , Skeena , Nass and from mainland coastal streams in the southern half of B.C., "are more likely to have a low prevalence of infection." The report also states, "It should be stressed that Henneguya , economically deleterious though it is, is harmless from the view of public health . It

13860-578: The time, and a favorite reading of Magellan. Magellan's perception of the natives, dressed in skins, and eating raw meat, clearly recalled the uncivilized Patagón in Vázquez's book. Novelist and travel writer Bruce Chatwin suggests etymological roots of both Patagon and Patagonia in his book, In Patagonia , noting the similarity between "Patagon" and the Greek word παταγος, which means "a roaring" or "gnashing of teeth" (in his chronicle, Pigafetta describes

13986-446: The time, prompting some of them to believe that Patagonians were giants. According to Antonio Pigafetta, one of the Magellan expedition's few survivors and its published chronicler, Magellan bestowed the name Patagão (or Patagón ) on the inhabitants they encountered there, and the name "Patagonia" for the region. Although Pigafetta's account does not describe how this name came about, subsequent popular interpretations gave credence to

14112-467: The total nitrogen available to the riparian woodlands . The foliage of spruce trees up to 500 m (1,600 ft) from a stream where grizzlies fish salmon have been found to contain nitrogen originating from the fished salmon. Beavers also function as ecosystem engineers; in the process of tree-cutting and damming , beavers alter the local ecosystems extensively. Beaver ponds can provide critical habitat for juvenile salmon . An example of this

14238-477: The treaty was signed, they voted for culture and administration to be apart from the country keeping the settlement, language, schools, traditions, regional dates, flag, anthems, and celebrations. Patagonians also live abroad in settlements like Saltcoats, Saskatchewan , Canada; New South Wales , Australia; South Africa; the Falkland Islands; and North America. Argentine Patagonia is for the most part

14364-597: The use of wild-caught fish as feed for the salmon, is the use of soy -based products. This should be better for the local environment of the fish farm, but producing soy beans has a high environmental cost for the producing region. The fish omega-3 fatty acid content would be reduced compared to fish-fed salmon. Another possible alternative is a yeast-based coproduct of bioethanol production, proteinaceous fermentation biomass. Substituting such products for engineered feed can result in equal (sometimes enhanced) growth in fish. With its increasing availability, this would address

14490-605: The water and if they had remained stationary "you could have walked across the stream without getting your shoes wet." The river was named by Holmes for its peaty brown colour. 49°13′49″N 122°52′31″W  /  49.230350°N 122.875271°W  / 49.230350; -122.875271 This article related to a river in British Columbia , Canada is a stub . You can help Misplaced Pages by expanding it . Salmon all other members of Salmoninae Salmon ( / ˈ s æ m ən / ; pl. : salmon)

14616-417: The water to attack terrestrial insects such as grasshoppers and dragonflies , as well as consuming fish eggs (even those of other salmon). As adults, salmon behave like other mid-sized pelagic fish , eating a variety of sea creatures including smaller forage fish such as lanternfish , herrings , sand lances , mackerels and barracudina . They also eat krill , squid and polychaete worms . In

14742-469: The way to the Rio Grande on the Atlantic coast. Snow can fall even in the summer in most areas, as well. The guanaco ( Lama guanicoe ), South American cougar ( Puma concolor concolor ), the Patagonian fox ( Lycalopex griseus ), Patagonian hog-nosed skunk ( Conepatus humboldtii ), and Magellanic tuco-tuco ( Ctenomys magellanicus ; a subterranean rodent ) are the most characteristic mammals of

14868-440: The westward slope has a much heavier precipitation than the eastern in a rainshadow effect; the western islands close to Torres del Paine receive an annual precipitation of 4,000 to 7,000 mm, whilst the eastern hills are less than 800 mm and the plains may be as low as 200 mm annual precipitation. Precipitation is highly seasonal in northwestern Patagonia. For example, Villa La Angostura in Argentina, close to

14994-620: The winter, and often experience very cold temperatures. In Chile, the city of Balmaceda is known for being situated in this region (which is otherwise almost exclusively in Argentina), and for being the coldest place in Chile. In 2017, temperatures even dropped down to −20   °C in the region. The northern Atlantic coast has warm summers (28 to 32   °C, but with relatively cool nights at 15   °C) and mild winters, with highs around 12   °C and lows about 2–3   °C. Occasionally, temperatures reach −10 or 40   °C, and rainfall

15120-560: The word patagón . Magellan used this term in 1520 to describe the native tribes of the region, whom his expedition thought to be giants. The people he called the Patagons are now believed to have been the Tehuelche , who tended to be taller than Europeans of the time. Argentine researcher Miguel Doura observed that the name Patagonia possibly derives from the ancient Greek region of modern Turkey called Paphlagonia , possible home of

15246-470: The word "chupat" belonging to a transitional language between the southern and northern Tehuelche ethnic groups that were located in that region called Tewsün or Teushen. The word means transparency and is related to the clarity and purity of the river that bears that name and runs through the province. It is also related to the origin of the Welsh pronunciation of the word "chupat" which later became "Chubut". It

15372-519: The world, with Norway being the world's largest producer of farmed salmon, followed by Chile . They are also highly prized game fish for recreational fishing , by both freshwater and saltwater anglers . Many species of salmon have since been introduced and naturalized into non-native environments such as the Great Lakes of North America , Patagonia in South America and South Island of New Zealand . The Modern English term salmon

15498-411: Was at times practised beyond this limit in nearby areas of Patagonia but populations reverted at times to non-agricultural lifestyles. By the time of the Spanish arrival to the area (1550s) there is no record of agriculture being practised in northern Patagonia. The extensive Patagonian grasslands and an associated abundance of guanaco game may have contributed for the indigenous populations to favour

15624-468: Was formerly inhabited by the jaguar subspecies Panthera onca mesembrina (which is considerably larger than living jaguars) during the Pleistocene, with jaguars continuing to inhabit Patagonia into historic times (until the late 19th century), but are now extirpated from the region. Bird life is often abundant. The crested caracara ( Caracara plancus ) is one of the characteristic aspects of

15750-548: Was neglected by the Spanish government, the latter being abandoned before Thomas Cavendish visited it in 1587 during his circumnavigation , and so desolate that he called it Port Famine . After the discovery of the route around Cape Horn, the Spanish Crown lost interest in southern Patagonia until the 18th century, when the coastal settlements Carmen de Patagones, San José, Puerto Deseado, and Nueva Colonia Floridablanca were established, although it maintained its claim of

15876-644: Was seen in the years following 1818 in the Columbia River Basin. In 1818, the British government made an agreement with the U.S. government to allow U.S. citizens access to the Columbia catchment (see Treaty of 1818 ). At the time, the Hudson's Bay Company sent word to trappers to extirpate all furbearers from the area in an effort to make the area less attractive to U.S. fur traders. In response to

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