Misplaced Pages

#849150

83-425: The story revolves around a little animated squirrel who, with much charm, accidentally helps two economically distressed families overcome their obstacles. Joe Mahoney, a vaudeville performer who has fallen on hard times, has to leave his best friend and stage companion Rupert, a dancing squirrel, in the town. Rupert will have to fend for himself with the other squirrels and live in a tree. Mahoney had been renting

166-415: A planetary body after the former is introduced by a space probe or spacecraft , either deliberately or unintentionally. It has also been hypothesized that the origin of life on earth is due to introductions of life from other planets billions of years ago, possibly by a sentient race. Projects have been proposed to introduce life to other lifeless but habitable planets in other star systems some time in

249-634: A flat (attached to the Dingle house) from the Dingle family consisting of miserly father Frank, his wife and their son Pete, an aspiring composer. Frank recently learned a gold mine he'd invested in years earlier will start paying a return of $ 1500 a week. Frank begins cashing the checks and hiding the bills in a hollow baseboard. A family of happy but impoverished acrobats, the Amendolas, move into Mahoney's former flat. Unsatisfied with tree life, Rupert also finds his way back to his old house. Rosalinda Amendola

332-526: A large stray dog in Lazo, Russia . Squirrel attacks on humans are exceedingly rare, but do occur. Whitaker examined the stomachs of 139 thirteen-lined ground squirrels and found bird flesh in four of the specimens and the remains of a short-tailed shrew in one; Bradley, examining the stomachs of white-tailed antelope squirrels , found at least 10% of his 609 specimens' stomachs contained some type of vertebrate, mostly lizards and rodents. Morgart observed

415-448: A lifespan of 5 to 10 years in the wild. Some can survive 10 to 20 years in captivity. Premature death may occur when a nest falls from the tree, in which case the mother may abandon her young if their body temperature is not correct. Many such baby squirrels have been rescued and fostered by a professional wildlife rehabilitator until they could be safely returned to the wild, although the density of squirrel populations in many places and

498-830: A native of East Asia, has been introduced into parts of Europe for ornamental reasons. Many plants have been introduced with the intent of aesthetically improving public recreation areas or private properties. The introduced Norway maple for example occupies a prominent status in many of Canada's parks. The transport of ornamental plants for landscaping use has and continues to be a source of many introductions. Some of these species have escaped horticultural control and become invasive. Notable examples include water hyacinth , salt cedar , and purple loosestrife . In other cases, species have been translocated for reasons of "cultural nostalgia", which refers to instances in which humans who have migrated to new regions have intentionally brought with them familiar organisms. Famous examples include

581-629: A near-cosmopolitan distribution. This further supports the hypothesis that the common ancestor of all squirrels, living and fossil, lived in North America, as these three most ancient lineages seem to have radiated from there; if squirrels had originated in Eurasia , for example, one would expect quite ancient lineages in Africa , but African squirrels seem to be of more recent origin. The main group of squirrels can be split into five subfamilies:

664-437: A new region may escape from captive or cultivated populations and subsequently establish independent breeding populations. Escaped organisms are included in this category because their initial transport to a new region is human motivated. The widespread phenomena of intentional introduction has also been described as biological globalization . Positive Introductions Although most introduced species have negative impacts on

747-584: A novel environment (e.g.: in Europe , house sparrows are well established since early Iron Age though they originated from Asia ). Immigrant species are species that travel, sometimes by themselves, but often with human help, between two habitats. Invasiveness is not a requirement. Introduction of a species outside its native range is all that is required to be qualified as an "introduced species". Such species might be termed naturalized , "established", or "wild non-native species". If they further spread beyond

830-463: A parasite or herbivore with it. Some become invasive, for example, the oleander aphid , accidentally introduced with the ornamental plant, oleander . Yet another unintentional pathway of introduction is during the delivery of humanitarian aid in the aftermath of natural disasters. This occurred during relief efforts for Hurricane Maria in Dominica , it was found that the common green iguana ,

913-713: A period of diurnality during the summer. During hot periods, squirrels have been documented to sploot , or lay their stomachs down on cool surfaces. Squirrels, like other rodents, employ species-specific strategies to store food, buffering against periods of scarcity. In temperate regions, squirrels commonly cache nuts beneath leaf litter, inside hollow trees, or underground. However, in subtropical and humid environments, traditional caching can lead to mold growth, decomposition, or premature germination. To counteract these challenges, some squirrels, particularly in subtropical zones, hang nuts or mushrooms on tree branches. This behavior, believed to minimize fungal infections and reduce

SECTION 10

#1732791061850

996-467: A population decrease. This was seen in the Atlantic Salmon population when high levels of escape from Atlantic Salmon farms into the wild populations resulted in hybrids that had reduced survival. Potential positive effects include adding to the genetic diversity of the population which can increase the adaptation ability of the population and increase the number of healthy individuals within

1079-758: A population. This was seen in the introduction of guppies in Trinidad to encourage population growth and introduce new alleles into the population. The results of this introduction included increased levels of heterozygosity and a larger population size . Wide-spread introductions of non-native iguanas are causing devastating effects on native Iguana populations in the Caribbean Lesser Antilles , as hybrids appear to have higher fitness than native iguanas, leading to competitive outcompetition and replacement. Numerous populations have already become extinct and hybridization continues to reduce

1162-402: A song publisher. It plays on a car radio as the group celebrates and Pete and Rosalinda embrace. In 1949, producer George Pal , who had formerly overseen animated shorts, convinced the independent Eagle-Lion Films to co-finance a two-picture deal with him. These films would be The Great Rupert and Destination Moon . The film was originally known as Money, Money, Money and was based on

1245-449: A species is considered "introduced" when its transport into an area outside of its native range is human mediated. Introductions by humans can be described as either intentional or accidental. Intentional introductions have been motivated by individuals or groups who either (1) believe that the newly introduced species will be in some way beneficial to humans in its new location or, (2) species are introduced intentionally but with no regard to

1328-517: A story by Ted Allen purchased by Pal in June 1948. It was adapted by Laszlo Vadnay. Filming started at General Service Studio on June 20, 1949. At one stage, the film was called The Great Amandola ; at another, it was Rupert II . Pal's stop-motion animation used in creating the illusion of the dancing squirrel was so realistic that he received many inquiries about where he had located a trained squirrel. In 1999, Arnold Leibovit Entertainment rereleased

1411-473: A white-tailed antelope squirrel capturing and eating a silky pocket mouse . The living squirrels are divided into five subfamilies , with about 58 genera and some 285 species . The oldest squirrel fossil, Hesperopetes , dates back to the Chadronian (late Eocene , about 40–35 million years ago ) and is similar to modern flying squirrels. A variety of fossil squirrels, from the latest Eocene to

1494-438: A wide gap, or diastema . The typical dental formula for sciurids is 1.0.1.3 1.0.1.3 . The purposes of squirrels' tails, to benefit the squirrel, include: The hairs from squirrel tails are prized in fly fishing when tying fishing flies . Squirrel hair is very fine, making it better for tying fishing flies. When the squirrel sits upright, its tail folded up its back may stop predators looking from behind from seeing

1577-592: A wide variety of plants, as well as nuts , seeds , conifer cones , fruits , fungi , and green vegetation . Some squirrels, however, also consume meat, especially when faced with hunger. Squirrels have been known to eat small birds , young snakes , and smaller rodents, as well as bird eggs and insects . Some tropical squirrel species have shifted almost entirely to a diet of insects. Squirrels, like pigeons and other fauna, are synanthropes , in that they benefit and thrive from their interaction in human environments. This gradual process of successful interaction

1660-406: Is a species living outside its native distributional range , but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are considered naturalized . The process of human-caused introduction

1743-744: Is called synurbanization, wherein squirrels lose their inherent fear of humans in an urban environment. When squirrels were almost completely eradicated during the Industrial Revolution in New York , they were later re-introduced to "entertain and remind" humans of nature. The squirrel blended into the urban environment so efficiently that when synanthropic behavior stops (i.e. people do not leave trash outside during particularly cold winters), they can become aggressive in their search for food. Aggression and predatory behavior has been observed in various species of ground squirrels, in particular

SECTION 20

#1732791061850

1826-501: Is distinguished from biological colonization , in which species spread to new areas through "natural" (non-human) means such as storms and rafting . The Latin expression neobiota captures the characteristic that these species are new biota to their environment in terms of established biological network (e.g. food web ) relationships. Neobiota can further be divided into neozoa (also: neozoons, sing. neozoon, i.e. animals) and neophyta (plants). The impact of introduced species

1909-528: Is highly variable. Some have a substantial negative effect on a local ecosystem (in which case they are also classified more specifically as an invasive species ), while other introduced species may have little or no negative impact (no invasiveness), and integrate well into the ecosystem they have been introduced to. Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides in agriculture for example. In some instances

1992-588: Is in love with Pete Dingle. Back in his old drey , Rupert makes space by clearing out Frank's hidden cache of money. As he throws the bills out, they float down into the Amendola house appearing to be sent from heaven in answer to Rosalinda's mother's prayers. Since Frank's gold mine pays weekly, he deposits money in the same spot every Thursday between 3-3:30 and this scene repeats itself many times. The Amendolas spread their wealth around, investing in small businesses all over town. As citizens begins to gossip about

2075-488: Is likely to cause economic or environmental harm or harm to human health". The biological definition of invasive species, on the other hand, makes no reference to the harm they may cause, only to the fact that they spread beyond the area of original introduction. Some argue that "invasive" is a loaded word and harm is difficult to define. From a regulatory perspective, it is neither desirable nor practical to list as undesirable or outright ban all non-native species (although

2158-703: Is not as frequently used); the Norwegian ikorn / ekorn ; the Dutch eekhoorn ; the Swedish ekorre and the Danish egern . A group of squirrels is called a "dray" or a "scurry". Squirrels are generally small animals, ranging in size from the African pygmy squirrel and least pygmy squirrel at 10–14 cm (3.9–5.5 in) in total length and just 12–26 g (0.42–0.92 oz) in weight, to

2241-493: Is seldom understood in the beginning, and many non-native ornamentals languish in the trade for years before suddenly naturalizing and becoming invasive. Studies have shown that introduced species display a greater likeliness of naturalizing when there is an appropriate environmental match, the plant species are short lived herbs or cultivate from seeds. Peaches , for example, originated in China, and have been carried to much of

2324-575: Is the European rabbit in Australia . Thomas Austin , a British landowner, had rabbits released on his estate in Victoria because he missed hunting them. A more recent example is the introduction of the common wall lizard ( Podarcis muralis) to North America by a Cincinnati boy, George Rau, around 1950 after a family vacation to Italy . Intentional introductions have also been undertaken with

2407-593: Is the seaweed Caulerpa taxifolia . Caulerpa was first observed in the Mediterranean Sea in 1984, off the coast of Monaco . By 1997, it had covered some 50 km . It has a strong potential to overgrow natural biotopes , and represents a major risk for sublittoral ecosystems . The origin of the alga in the Mediterranean was thought to be either as a migration through the Suez Canal from

2490-859: Is the reintroduction of a species that has become locally endangered or extinct, done in the interests of conservation. Examples of successful reintroductions include wolves to Yellowstone National Park in the U.S., and the red kite to parts of England and Scotland. Introductions or translocations of species have also been proposed in the interest of genetic conservation , which advocates the introduction of new individuals into genetically depauperate populations of endangered or threatened species. Unintentional introductions occur when species are transported by human vectors. Increasing rates of human travel are providing accelerating opportunities for species to be accidentally transported into areas in which they are not considered native. For example, three species of rat (the black, Norway and Polynesian) have spread to most of

2573-551: Is the small Indian mongoose ( Urva auropunctata ). Originating in a region encompassing Iran and India , it was introduced to the West Indies and Hawaii in the late 1800s for pest control. Since then, it has thrived on prey unequipped to deal with its speed, nearly leading to the local extinction of a variety of species. In some cases, introduced animals may unintentionally promote the cause of rewilding . For example, escaped horses and donkeys that have gone feral in

The Great Rupert - Misplaced Pages Continue

2656-594: The American bison and the turkey are non-native species to North America. Collectively, non-native crops and livestock account for 98% of US food. These and other benefits from non-natives are so vast that, according to the Congressional Research Service, they probably exceed the costs. Other examples of species introduced for the purposes of benefiting agriculture , aquaculture or other economic activities are widespread. Eurasian carp

2739-684: The Australian Dung Beetle Project in an effort to reduce the impact of livestock manure. The timber industry promoted the introduction of Monterey pine ( Pinus radiata ) from California to Australia and New Zealand as a commercial timber crop. These examples represent only a small subsample of species that have been moved by humans for economic interests. The rise in the use of genetically modified organisms has added another potential economic advantage to introducing new/modified species into different environments. Companies such as Monsanto that earn much of their profit through

2822-522: The Bhutan giant flying squirrel at up to 1.27 m (4 ft 2 in) in total length, and several marmot species, which can weigh 8 kg (18 lb) or more. Squirrels typically have slender bodies with very long very bushy tails and large eyes. In general, their fur is soft and silky, though much thicker in some species than others. The coat color of squirrels is highly variable between—and often even within—species. In most squirrel species,

2905-644: The Callosciurinae , 60 species mostly found in South East Asia ; the Ratufinae , 4 cat-sized species found in south and southeast Asia ; the Sciurinae , which contains the flying squirrels (Pteromyini) and the tree squirrels , 83 species found worldwide; Sciurillinae , a single South American species; and Xerinae , which includes three tribes of mostly terrestrial squirrels, including

2988-553: The Cuban tree frog , and potentially the Venezuela snouted tree frog were introduced with the former two becoming established. Most accidentally or intentionally introduced species do not become invasive as the ones mentioned above. For instance, Some 179 coccinellid species have been introduced to the U.S. and Canada; about 27 of these non-native species have become established, and only a handful can be considered invasive, including

3071-674: The Eocene epoch, and among other living rodent families, the squirrels are most closely related to the mountain beaver and dormice . The word squirrel , first attested in 1327, comes from the Anglo-Norman esquirel which is from the Old French escurel , the reflex of a Latin word sciurus , which was taken from the Ancient Greek word σκίουρος ( skiouros ; from σκία-ουρος ) 'shadow-tailed', referring to

3154-458: The Marmotini ( marmots , chipmunks , prairie dogs , and other Holarctic ground squirrels), Xerini (African and some Eurasian ground squirrels), and Protoxerini (African tree squirrels). Introduced species An introduced species , alien species , exotic species , adventive species , immigrant species , foreign species , non-indigenous species , or non-native species

3237-495: The Miocene , have not been assigned with certainty to any living lineage. At least some of these probably were variants of the oldest basal "protosquirrels" (in the sense that they lacked the full range of living squirrels' autapomorphies ). The distribution and diversity of such ancient and ancestral forms suggest the squirrels as a group may have originated in North America. Apart from these sometimes little-known fossil forms,

3320-560: The State of Hawaii has adopted an approach that comes close to this). Regulations require a definitional distinction between non-natives that are deemed especially onerous and all others. Introduced "pest" species, that are officially listed as invasive, best fit the definition of an invasive species. Early detection and rapid response is the most effective strategy for regulating a pest species and reducing economic and environmental impacts of an introduction. Management of invasion pathways are on

3403-580: The cane toad and red fox in Australia , nutria in North America , Eurasia , and Africa , and the common brushtail possum in New Zealand . In Taiwan , the success of introduced bird species was related to their native range size and body size; larger species with larger native range sizes were found to have larger introduced range sizes. One notoriously devastating introduced species

The Great Rupert - Misplaced Pages Continue

3486-496: The family Sciuridae ( / s ɪ ˈ j uː r ɪ d eɪ , - d iː / ), a family that includes small or medium-sized rodents . The squirrel family includes tree squirrels , ground squirrels (including chipmunks and prairie dogs , among others), and flying squirrels . Squirrels are indigenous to the Americas, Eurasia, and Africa, and were introduced by humans to Australia. The earliest known fossilized squirrels date from

3569-465: The phylogeny of the living squirrels is fairly straightforward. The three main lineages are the Ratufinae (Oriental giant squirrels), Sciurillinae and all other subfamilies. The Ratufinae contain a mere handful of living species in tropical Asia . The neotropical pygmy squirrel of tropical South America is the sole living member of the Sciurillinae. The third lineage, by far the largest, has

3652-402: The thirteen-lined ground squirrel . For example, Bernard Bailey, a scientist in the 1920s, observed a thirteen-lined ground squirrel preying upon a young chicken . Wistrand reported seeing this same species eating a freshly killed snake . There has also been at least one report of squirrels preying on atypical animals, such as an incident in 2005 where a pack of black squirrels killed and ate

3735-517: The Americas may play ecological roles similar to those of the equids that became extinct there at the end of the Pleistocene . The exotic pet trade has also been a large source of introduced species. The species favored as pets have more general habitat requirements and larger distributions. Therefore, as these pets escape or are released, unintentionally or intentionally, they are more likely to survive and establish non-native populations in

3818-697: The Indian subcontinent and is impacting a range of wild species including urban birds. Most introduced species do not become invasive. Examples of introduced animals that have become invasive include the gypsy moth in eastern North America , the zebra mussel and alewife in the Great Lakes , the Canada goose and gray squirrel in Europe, the beaver in Tierra del Fuego , the muskrat in Europe and Asia ,

3901-433: The Mediterranean region, where it can form monocultures that threaten critical conservation habitats. Japanese knotweed grows profusely in many nations. Human beings introduced it into many places in the 19th century. It is a source of resveratrol , a dietary supplement. It can grow in building foundations, threatening their stability, and spreads quite quickly. Mesquite ( Prosopis juliflora ) has spread very widely across

3984-618: The Red Sea, or as an accidental introduction from an aquarium. Another troublesome plant species is the terrestrial plant Phyla canescens , which was intentionally introduced into many countries in North America, Europe, and Africa as an ornamental plant. This species has become invasive in Australia, where it threatens native rare plants and causes erosion and soil slumping around river banks. It has also become invasive in France where it has been listed as an invasive plant species of concern in

4067-436: The aim of ameliorating environmental problems. A number of fast spreading plants such as kudzu have been introduced as a means of erosion control. Other species have been introduced as biological control agents to control invasive species . This involves the purposeful introduction of a natural enemy of the target species with the intention of reducing its numbers or controlling its spread. A special case of introduction

4150-532: The broadest and most widely used sense, an introduced species is synonymous with "non-native" and therefore applies as well to most garden and farm organisms; these adequately fit the basic definition given above. However, some sources add to that basic definition "and are now reproducing in the wild", which means that species growing in a garden, farm, or house may not meet the criteria unless they escape and persist. There are many terms associated with introduced species that represent subsets of introduced species, and

4233-409: The characteristic shape of a small mammal. Squirrels live in almost every habitat, from tropical rainforest to semiarid desert , avoiding only the high polar regions and the driest of deserts . They are predominantly herbivorous , subsisting on seeds and nuts, but many will eat insects and even small vertebrates. Many juvenile squirrels die in the first year of life. Adult squirrels can have

SECTION 50

#1732791061850

4316-435: The constant care required by premature squirrels means that few rehabilitators are willing to spend their time doing this and such animals are routinely euthanized instead. Squirrels mate either once or twice a year and, following a gestation period of three to six weeks, give birth to a number of offspring that varies by species. The young are altricial , being born naked, toothless, and blind. In most species of squirrel,

4399-539: The economy. There have been calls from scientists to consider a species "invasive" only in terms of their spread and reproduction rather than the harm they may cause. According to a practical definition, an invasive species is one that has been introduced and become a pest in its new location, spreading (invading) by natural means. The term is used to imply both a sense of urgency and actual or potential harm. For example, U.S. Executive Order 13112 (1999) defines "invasive species" as "an alien species whose introduction does or

4482-585: The ecosystems they enter into, there are still some species that have affected the ecosystem in a positive way. For example, in New Hampshire invasive plants can provide some benefits to some species. Invasive species such as autumn olive, oriental bittersweet, and honeysuckle produce fruit that is used by a handful of fruit-eating bird species. The invasive plants can also be a source of pollen and nectar for many insects, such as bees. These invasive plants were able to help their ecosystem thriving, and increase

4565-493: The female alone looks after the young, which are weaned at six to ten weeks and become sexually mature by the end of their first year. In general, the ground-dwelling squirrel species are social, often living in well-developed colonies, while the tree-dwelling species are more solitary. Ground squirrels and tree squirrels are usually either diurnal or crepuscular , while the flying squirrels tend to be nocturnal —except for lactating flying squirrels and their young, which have

4648-470: The film on DVD and in 2022 a high definition restored unedited version was released with original main titles to the various streaming platforms such as TubiTV, Amazon, Plex, Apple TV and others. In 2003, 20th Century Fox and Legend Films revived the public domain film with a colorized special edition under the title A Christmas Wish . For that release, Terry Moore provided an audio commentary track. Squirrel Squirrels are members of

4731-473: The forefront of eliminating unwanted invasive species this would include preliminary steps; educating the public, cooperation from industries and government resources. In Great Britain , the Wildlife and Countryside Act 1981 prevents the introduction of any animal not naturally occurring in the wild or any of a list of both animals or plants introduced previously and proved to be invasive. By definition ,

4814-408: The hidden (presumed burned) cash and promise to help him rebuild the house. Rupert, having been saved by firefighters, goes back to the park where he is picked up by Mr. Mahoney and enlisted in a newly-minted circus act. In the final scene, the families tour the rebuilt home and learn that an oil well Pete had invested in finally came in and his music ("Music for Orphaned Instruments") was purchased by

4897-433: The hind limbs are longer than the forelimbs, while all species have either four or five toes on each foot. The feet, which include an often poorly developed thumb , have soft pads on the undersides and versatile, sturdy claws for grasping and climbing . Tree squirrels , unlike most mammals, can descend a tree headfirst. They do so by rotating their ankles 180 degrees, enabling the hind feet to point backward and thus grip

4980-586: The intentionally introduced Harmonia axyridis , multicolored Asian lady beetle . However the small percentage of introduced species that become invasive can produce profound ecological changes. In North America, Harmonia axyridis has become the most abundant lady beetle and probably accounts for more observations than all the native lady beetles put together. Many non-native plants have been introduced into new territories, initially as either ornamental plants or for erosion control, stock feed, or forestry. Whether an exotic will become an invasive species

5063-849: The introduction of common starlings to North America by the American Eugene Schieffelin , a lover of the works of Shakespeare and the chairman of the American Acclimatization Society , who, it is rumoured, wanted to introduce all of the birds mentioned in Shakespeare's plays into the United States. He deliberately released eighty starlings into Central Park in New York City in 1890, and another forty in 1891. Yet another prominent example of an introduced species that became invasive

SECTION 60

#1732791061850

5146-489: The invasive comb jelly Mnemiopsis leidyi , the dangerous bacterium Vibrio cholerae , or the fouling zebra mussel . The Mediterranean and Black Seas, with their high volume shipping from exotic sources, are most impacted by this problem. Busy harbors are all potential hotspots as well: over 200 species have been introduced to the San Francisco Bay in this manner making it the most heavily invaded estuary in

5229-515: The long bushy tail which many of its members have. Sciurus is also the name of one of its genuses. The native Old English word for the squirrel, ācweorna , only survived into Middle English (as aquerne ) before being replaced. The Old English word is of Common Germanic origin, cognates of which are still used in other Germanic languages , including the German Eichhörnchen (diminutive of Eichhorn , which

5312-496: The mortise-tenon joint in carpentry. Because squirrels cannot digest cellulose , they must rely on foods rich in protein , carbohydrates , and fats . In temperate regions, early spring is the hardest time of year for squirrels because the nuts they buried are beginning to sprout (and thus are no longer available to eat), while many of the usual food sources are not yet available. During these times, squirrels rely heavily on tree buds. Squirrels, being primarily herbivores , eat

5395-547: The native animal's chances of survival. Several introduced exotic trees served as nest sites for resident waterbird species in Udaipur city, India. Perhaps the most common motivation for introducing a species into a new place is that of economic gain. Non-native species can become such a common part of an environment, culture, and even diet that little thought is given to their geographic origin. For example, soybeans , kiwi fruit , wheat , honey bees , and all livestock except

5478-459: The new environment. Adventive species are often considered synonymous with "introduced species", but this term is sometimes applied exclusively to introduced species that are not permanently established. Naturalized species are often introduced species that do not need human help to reproduce and maintain their population in an area outside their native range (no longer adventive), but that also applies to populations migrating and establishing in

5561-517: The number of native iguanas on multiple islands. In plants, introduced species have been observed to undergo rapid evolutionary change to adapt to their new environments, with changes in plant height, size, leaf shape, dispersal ability, reproductive output, vegetative reproduction ability, level of dependence on the mycorrhizal network , and level of phenotype plasticity appearing on timescales of decades to centuries. It has been hypothesized that invasive species of microbial life could contaminate

5644-431: The place of introduction and cause damage to nearby species, they are called " invasive species ". The transition from introduction, to establishment and to invasion has been described in the context of plants. Introduced species are essentially "non-native" species. Invasive species are those introduced species that spread widely or quickly and cause harm, be that to the environment, human health, other valued resources, or

5727-778: The populated world. Tomatoes are native to the Andes . Squash ( pumpkins ), maize (corn), and tobacco are native to the Americas , but were introduced to the Old World . Many introduced species require continued human intervention to survive in the new environment. Others may become feral, but do not seriously compete with natives, but simply increase the biodiversity of the area. One example would be Dandelions in North America , which have become an essential source of early season nectar for both native and introduced pollinators, and do not meaningfully compete with native grasses or flowers. A very troublesome marine species in southern Europe

5810-572: The potential for being beneficial or detrimental in the long run remains unknown. The effects of introduced species on natural environments have gained much scrutiny from scientists, governments, farmers and others. The formal definition of an introduced species from the United States Environmental Protection Agency is "A species that has been intentionally or inadvertently brought into a region or area. Also called an exotic or non-native species". In

5893-436: The potential impact. Unintentional or accidental introductions are most often a byproduct of human movements and are thus unbound to human motivations. Subsequent range expansion of introduced species may or may not involve human activity. Species that humans intentionally transport to new regions can subsequently become successfully established in two ways. In the first case, organisms are purposely released for establishment in

5976-464: The purposes of sport fishing and hunting. The introduced amphibian ( Ambystoma tigrinum ) that threatens the endemic California salamander ( A. californiense ) was introduced to California as a source of bait for fishermen. Pet animals have also been frequently transported into new areas by humans, and their escapes have resulted in several introductions, such as feral cats , parrots , and pond slider . Lophura nycthemera ( silver pheasant ),

6059-414: The risk of food loss, also inadvertently aids certain trees, like Cyclobalanopsis , in expanding their range, with forgotten or dislodged nuts sprouting in new locations, influencing forest ecology. Two species of flying squirrel, the particolored flying squirrel and Hainan flying squirrel aid such cacheing by carving grooves into the nuts to fix the nuts tightly between small intersecting twigs, akin to

6142-519: The selling of genetically modified seeds has added to the controversy surrounding introduced species. The effect of genetically modified organisms varies from organism to organism and is still being researched today, however, the rise of genetically modified organisms has added complexity to the conversations surrounding introduced species. Introductions have also been important in supporting recreation activities or otherwise increasing human enjoyment. Numerous fish and game animals have been introduced for

6225-500: The source of Amendola's money, taxmen and police converge on the Amendola house demanding answers right around the same time Frank is informed the gold mine is tapped out. While the IRS agent and police officers wait for the miracle money to appear, Rupert catches a lit cigarette and stores it in his drey where it starts a fire that engulfs the Dingle home. Outside, during the ensuing blaze, the Amendolas are told by an inconsolable Frank about

6308-628: The terminology associated with introduced species is now in flux for various reasons. Examples of these terms are "invasive", "acclimatized", "adventive", "naturalized", and "immigrant" species. The term "invasive" is used to describe introduced species that cause ecological, economic, or other damage to the area in which they were introduced. Acclimatized species are introduced species that have changed physically and/or behaviorally in order to adjust to their new environment. Acclimatized species are not necessarily optimally adjusted to their new environment and may just be physically/behaviorally sufficient for

6391-446: The tree bark from the opposite direction. As their large eyes indicate, squirrels have excellent vision , which is especially important for the tree-dwelling species. Many also have a good sense of touch , with vibrissae on their limbs as well as their heads. The teeth of sciurids follow the typical rodent pattern, with large incisors (for gnawing) that grow throughout life, and cheek teeth (for grinding) that are set back behind

6474-619: The wild. Among the popular exotic pets that have become alien or invasive species are parrots, frogs, terrapins, and iguanas. Some species, such as the Western honey bee , brown rat , house sparrow , ring-necked pheasant , and European starling , have been introduced very widely. In addition there are some agricultural and pet species that frequently become feral ; these include rabbits , dogs , ducks , snakes , goats , fish , pigs , and cats . Many water fleas such as Daphnia , Bosmina and Bythotrephes have introduced around

6557-423: The wild. It is sometimes difficult to predict whether a species will become established upon release, and if not initially successful, humans have made repeated introductions to improve the probability that the species will survive and eventually reproduce in the wild. In these cases, it is clear that the introduction is directly facilitated by human desires. In the second case, species intentionally transported into

6640-427: The world as hitchhikers on ships, and arachnids such as scorpions and exotic spiders are sometimes transported to areas far beyond their native range by riding in shipments of tropical fruit. This was seen during the introduction of Steatoda nobilis (Noble false widow) worldwide through banana shipments. Further there are numerous examples of marine organisms being transported in ballast water , among them

6723-431: The world, causing dramatic changes in native freshwater ecosystems. When a new species is introduced, the species could potentially breed with members of native species, producing hybrids. The effect of the creating of hybrids can range from having little effect, a negative effect, to having devastating effects on native species. Potential negative effects include hybrids that are less fit for their environment resulting in

6806-603: The world. There is also the accidental release of the Africanized honey bees (AHB), known colloquially as "killer bees") or Africanized bee to Brazil in 1957 and the Asian carp to the United States. The insect commonly known as the brown marmorated stink bug ( Halyomorpha halys ) was introduced accidentally in Pennsylvania. Another form of unintentional introductions is when an intentionally introduced plant carries

6889-534: Was first introduced to the United States as a potential food source. The apple snail was released in Southeast Asia with the intent that it be used as a protein source, and subsequently to places like Hawaii to establish a food industry. In Alaska, foxes were introduced to many islands to create new populations for the fur trade. About twenty species of African and European dung beetles have established themselves in Australia after deliberate introduction by

#849150