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Gulf Darter
The gulf darter (''Etheostoma swaini'') is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is found in Louisiana, Mississippi, Alabama, Florida, Tennessee, and Kentucky. It is a colorful fish, males having vertical barring of red-orange and blue-green near the tail, growing to a length of about . It is typically found in small and medium-sized creeks, often in very shallow water. It occurs over sandy bottoms and among aquatic vegetation such as ''Sparganium americanum'', foraging among the plants and organic debris for insect larvae and small invertebrates. The International Union for Conservation of Nature has assessed its conservation status as being of "least concern". Appearance and anatomy The gulf darter is known for its laterally compressed, robust body, small, conical head, slightly joined gill membranes and a wide frenum on its upper lip. The ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etheostoma Swaini
The gulf darter (''Etheostoma swaini'') is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is found in Louisiana, Mississippi, Alabama, Florida, Tennessee, and Kentucky. It is a colorful fish, males having vertical barring of red-orange and blue-green near the tail, growing to a length of about . It is typically found in small and medium-sized creeks, often in very shallow water. It occurs over sandy bottoms and among aquatic vegetation such as ''Sparganium americanum'', foraging among the plants and organic debris for insect larvae and small invertebrates. The International Union for Conservation of Nature has assessed its conservation status as being of "least concern". Appearance and anatomy The gulf darter is known for its laterally compressed, robust body, small, conical head, slightly joined gill membranes and a wide frenum on its upper lip. The ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Union For Conservation Of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natural resources. It is involved in data gathering and analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through building partnerships. The organization is best known to the wider pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blackbanded Darter
The blackbanded darter (''Percina nigrofasciata'') is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to the river systems of the southeastern United States where it is found in the states of Tennessee, Georgia, Florida, Mississippi, Alabama, and Louisiana. It lives over sandy or gravelly bottoms in smaller rivers and streams and its color varies depending on the different habitats in which it lives. It feeds on small insect larvae and is itself preyed on by larger fish. It spawns between February and June depending on locality. It is generally a common fish throughout most of its range. Description The body of the fish is variable and is influenced by the surrounding habitat. The blackbanded darter will be a light color if it is found along a sandy substrate. The darters that have a dark color are usually found around leaf litter, sticks, and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speckled Madtom
The speckled madtom (''Noturus leptacanthus'') is a small freshwater fish found in the southeastern United States that belongs to the genus '' Noturus'' of the family Ictaluridae. Description The speckled madtom is a dark reddish-brown color and has a dusky or mottled caudal fin with a pale border. The species' average length is between ; however, the longest ever recorded specimen was . Distribution The speckled madtom has a wide range throughout the southeastern United States. The species is found in abundance throughout Louisiana, Mississippi, Alabama, Georgia, Florida, South Carolina, and Tennessee. In Tennessee it is found only in the Conasauga River system, where it is abundant.Etnier, David A., and Wayne C. Starnes., The Fishes of Tennessee. Knoxville, Tennessee: The University of Tennessee Press, 2001. 321-22. Web. 20 Nov. 2013. It is also found in Atlantic and Gulf slope drainages from the Edisto River in South Carolina to the Amite- Comite River system of Louisiana. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substrate (biology)
In biology, a substrate is the surface on which an organism (such as a plant, fungus, or animal) lives. A substrate can include biotic or abiotic materials and animals. For example, encrusting algae that lives on a rock (its substrate) can be itself a substrate for an animal that lives on top of the algae. Inert substrates are used as growing support materials in the hydroponic cultivation of plants. In biology substrates are often activated by the nanoscopic process of substrate presentation. In agriculture and horticulture * Cellulose substrate * Expanded clay aggregate (LECA) * Rock wool * Potting soil * Soil In animal biotechnology Requirements for animal cell and tissue culture Requirements for animal cell and tissue culture are the same as described for plant cell, tissue and organ culture (In Vitro Culture Techniques: The Biotechnological Principles). Desirable requirements are (i) air conditioning of a room, (ii) hot room with temperature recorder, (iii) microscope r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microhabitat
In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical manifestation of its ecological niche. Thus "habitat" is a species-specific term, fundamentally different from concepts such as environment or vegetation assemblages, for which the term "habitat-type" is more appropriate. The physical factors may include (for example): soil, moisture, range of temperature, and light intensity. Biotic factors will include the availability of food and the presence or absence of predators. Every species has particular habitat requirements, with habitat generalist species able to thrive in a wide array of environmental conditions while habitat specialist species requiring a very limited set of factors to survive. The habitat of a species is not necessarily found in a geographical area, it can be the interio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obion River
The Obion River system is the primary surface water Surface water is water located on top of land forming terrestrial (inland) waterbodies, and may also be referred to as ''blue water'', opposed to the seawater and waterbodies like the ocean. The vast majority of surface water is produced by prec ... drainage system of northwestern Tennessee, United States. Description The Obion has four major forks, the North Fork, Middle Fork, South Fork and Rutherford Fork (which is named after Henry Rutherford an early surveyor of the area). The confluences of these forks are a few miles above the mouth of the Obion's discharge into the Mississippi River. For the greater parts of their lengths, the forks exist as separate streams. In the mid-20th century, the Obion system was largely River engineering#Channelization, channelized for agriculture, agricultural purposes, under the auspices of the ''Obion-Forked Deer Basin Authority'', a Tennessee state agency that coordinated this work ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buffalo Bayou
Buffalo Bayou is a slow-moving body of water which flows through Houston in Harris County, Texas. Formed 18,000 years ago, it has its source in the prairie surrounding Katy, Fort Bend County, and flows approximately east through the Houston Ship Channel into Galveston Bay and the Gulf of Mexico. In addition to drainage water impounded and released by the Addicks and Barker reservoirs, the bayou is fed by natural springs, surface runoff, and several significant tributary bayous, including White Oak Bayou, Greens Bayou, and Brays Bayou. Additionally, Buffalo Bayou is considered a tidal river downstream of a point west of the Shepherd Drive bridge in west-central Houston. As the principal river of Greater Houston, the Buffalo Bayou watershed is heavily urbanized. Its direct drainage area contains a population of over 440,000. Including tributaries, the bayou has a watershed area of approximately . Route The upper watershed of Buffalo Bayou is impounded by the Addicks and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mississippi River
The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 32 U.S. states and two Canadian provinces between the Rocky and Appalachian mountains. The main stem is entirely within the United States; the total drainage basin is , of which only about one percent is in Canada. The Mississippi ranks as the thirteenth-largest river by discharge in the world. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana. Native Americans have lived along the Mississippi River and its tributaries for thousands of years. Most were hunter-ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ochlockonee River
The Ochlockonee River ( ) is a fast running river, except where it has been dammed to form Lake Talquin in Florida, originating in Georgia and flowing for before terminating in Florida. Background The name is from the Hitchiti language words for yellow river. The Ochlockonee originates south of the town of Sylvester in Worth County in southwest Georgia and empties into Ochlockonee Bay and then Apalachee Bay in Florida. The river forms the western boundaries of Leon County and Wakulla County and eastern boundaries of Gadsden County, Liberty County, and Franklin County in Florida. It flows through the Red Hills, the Jackson Bluff Dam, Talquin State Forest, Lake Talquin State Park and the Apalachicola National Forest, and past Ochlockonee River State Park, where it is tidally influenced and a mixture of fresh, brackish, and salt water, on the way to its terminus in Ochlockonee Bay, which then empties into Apalachee Bay, with tidal influences extending upstream over from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Pontchartrain
Lake Pontchartrain ( ) is an estuary located in southeastern Louisiana in the United States. It covers an area of with an average depth of . Some shipping channels are kept deeper through dredging. It is roughly oval in shape, about from west to east and from south to north. In descending order of area, the lake is located in parts of six Louisiana parishes: St. Tammany, Orleans, Jefferson, St. John the Baptist, St. Charles, and Tangipahoa. The water boundaries were defined in 1979 (see list of parishes in Louisiana). The lake is crossed by the Lake Pontchartrain Causeway, the longest continuous bridge over water in the world. A power line also crosses the lake. Its towers stand on caissons in Lake Pontchartrain, and its length can be used to visually demonstrate the curvature of the earth. Toponymy Lake Pontchartrain is named for , . He was the French Minister of the Marine, Chancellor, and Controller-General of Finances during the reign of France's "Sun King", L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caudal Fin
Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim. Fins located in different places on the fish serve different purposes such as moving forward, turning, keeping an upright position or stopping. Most fish use fins when swimming, flying fish use pectoral fins for gliding, and frogfish use them for crawling. Fins can also be used for other purposes; male sharks and mosquitofish use a modified fin to deliver sperm, thresher sharks use their caudal fin to stun prey, reef stonefish have spines in their dorsal fins that inject venom, anglerfish use the first spine of their dorsal fin like a fishing rod to lu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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