13-591: The Econlockhatchee River ( Econ River for short) is an 54.5-mile-long (87.7 km) north-flowing blackwater tributary of the St. Johns River . The Econ River flows through Osceola , Orange , and Seminole counties in Central Florida , just east of the Orlando Metropolitan Area (east of State Road 417 ). It is a designated Outstanding Florida Waters . The origin of the river's name
26-570: A low conductivity , similar to that of rainwater. Black and white waters differ in their planktonic fauna and flora. Tables 2 and 3 compare the number of planktonic animals caught in black and white water localities only a few meters apart. The black water was not as extreme an example as the Rio Negro system. However, it can be seen that the black water held greater numbers of rotifers but fewer crustaceans and mites . These crustaceans are important foods for larval fish . The zones where
39-409: Is 21 kilometres (13 mi) long, from Lake Conlin to State Road 528 . South of State Road 532 , the swamp is known as Cat Island Swamp, named after an island near County Road 500A . The river is at its widest (1.6 km) here, bordered by Lake Preston to the west. Seven miles downstream, the river's elevation is 19 metres (62 ft). The Disston Canal joins Lake Mary Jane and Lake Hart to
52-523: Is not known definitively. In 1839 the spelling was recorded as “Econ-like Hatchee”. It is theorized that this represents a Muscogee name meaning “earth-mound stream”, with “econ-like” coming from ēkvnv (/iːkaná/), ‘earth, land’, and like (/léyki/), ‘sitting’, plus hvcce (/háčči/), ‘stream’. The river flows north from its source , Lake Conlin , through the Econlockhatchee River Swamp (see below) south of State Road 528 . Near
65-855: Is somewhat acidic (typical pH ~6.5) and very clear with a greenish color. The main Amazonian clearwater rivers have their source in the Brazilian Plateau (such as Tapajós , Tocantins , Xingu and some right tributaries of the Madeira ), but some originate in the Guiana Shield (such as Nhamundá , Paru , and Araguari ). Other rivers in Australia may experience infrequent 'blackwater events' associated with flood waters connecting to forested floodplains and these events may be associated with hypoxic waters [low oxygen]. Examples include
78-851: The Amazon Basin and the Southern United States . The term is used in fluvial studies, geology , geography , ecology , and biology . Not all dark rivers are blackwater in that technical sense. Some rivers in temperate regions, which drain or flow through areas of dark black loam , are simply black due to the color of the soil; these rivers are black mud rivers . There are also black mud estuaries . Blackwater rivers are lower in nutrients than whitewater rivers and have ionic concentrations higher than rainwater. The unique conditions lead to flora and fauna that differ from both whitewater and clearwater rivers . The classification of Amazonian rivers into black, clear, and whitewater
91-1135: The Murray River , Edward River , Wakool River and Murrumbidgee River . Harald Sioli Look for Harald Sioli on one of Misplaced Pages's sister projects : [REDACTED] Wiktionary (dictionary) [REDACTED] Wikibooks (textbooks) [REDACTED] Wikiquote (quotations) [REDACTED] Wikisource (library) [REDACTED] Wikiversity (learning resources) [REDACTED] Commons (media) [REDACTED] Wikivoyage (travel guide) [REDACTED] Wikinews (news source) [REDACTED] Wikidata (linked database) [REDACTED] Wikispecies (species directory) Misplaced Pages does not have an article with this exact name. Please search for Harald Sioli in Misplaced Pages to check for alternative titles or spellings. You need to log in or create an account and be autoconfirmed to create new articles. Alternatively, you can use
104-467: The article wizard to submit a draft for review, or request a new article . Search for " Harald Sioli " in existing articles. Look for pages within Misplaced Pages that link to this title . Other reasons this message may be displayed: If a page was recently created here, it may not be visible yet because of a delay in updating the database; wait a few minutes or try the purge function . Titles on Misplaced Pages are case sensitive except for
117-582: The City of Oviedo , the tributary Little Econlockhatchee River joins, and the river turns east as it flows through the Little Big Econ State Forest . The Econlockhatchee joins the St. Johns River near Puzzle Lake . The river's floodplain is forested for its entire length. The upper course of the river is called the Econlockhatchee River Swamp. Located southeast of Orlando , the swamp
130-418: The more neutral white waters. The major difference is the concentrations of sodium , magnesium , calcium , and potassium ; these are very low in black waters. This has ecological implications. Some animals need more calcium than is available in blackwaters, so for example, snails , which need much calcium to build shells, are not abundant in blackwaters. The lack of dissolved ions in black waters results in
143-517: The swamp. Turkey Creek Bay is an arm of the swamp , through which the tributary Turkey Creek flows. North of Wewahootee Road , the Econlockhatchee River leaves the swamp and remains a free-flowing river for the rest of its journey to the St. Johns River . Blackwater river A blackwater river is a type of river with a slow-moving channel flowing through forested swamps or wetlands . Most major blackwater rivers are in
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#1732775532514156-473: The two waters mix are attractive to ostracods and young fish. These mixing zones tend to have many animals. The abundance is shown in Table 3, which compares animals in 10 litres (2.2 imp gal; 2.6 US gal) of water. Blackwater rivers resemble clearwater rivers in having a low conductivity and relatively low levels of dissolved solids , but clearwater rivers have water that often only
169-620: Was first proposed by Alfred Russel Wallace in 1853 based on water colour, but the types were more clearly defined by chemistry and physics by Harald Sioli [ de ] from the 1950s to the 1980s. Although many Amazonian rivers fall clearly into one of these categories, others show a mix of characteristics and may vary depending on season and flood levels. Black and white waters differ significantly in their ionic composition, as shown in Table 1 . Black waters are more acidic , resulting in an aluminum concentration greater than that of
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