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Plicate Rocksnail
The plicate rocksnail, scientific name ''Leptoxis plicata'', is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species is endemic to the United States, specifically the state of Alabama. The snail has been listed as endangered on the United States Fish and Wildlife Service list of endangered species since October 28, 1998. Description The plicate rocksnail is a pleurocerid snail with a shell that grows to about 20 mm (0.8 in) in length. Shells are subglobose with broadly rounded apertures. The body whorl may be ornamented with strong folds or plicae. Shell color is usually brown, occasionally green, and often with four equidistant color bands. The columella (central column or axis) is smooth, rounded, and typically pigmented in the upper half. The aperture is usually bluish-white, occasionally pink or white. The operculum (plate that closes the shell when the snail is retracted) is da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-Charles Chenu
Jean-Charles Chenu (30 August 1808 – 12 November 1879) was a French physician, naturalist and author. Bibliography Natural history *''Illustrations conchyliologiques ou description et figures de toutes les coquilles connues vivantes et fossiles, classées suivant le système de Lamarck modifié d'après les progrès de la science et comprenant les genres nouveaux et les espèces rècemment découvertes'' (1842–1854) ** 1842Tome I.- Volume one contains ammonites, land snails and sea snails. * 1845. Histoire Naturelle des Coquilles D'Angleterre'. Paris, A. Franck. - This is translation in French from English of work by Edward Donovan Edward Donovan (1768 – 1 February 1837) was an Anglo-Irish writer, natural history illustrator, and amateur zoologist. He did not travel, but collected, described and illustrated many species based on the collections of other naturalists. H .... ''The Natural History of British Shells, including Figures and Descriptions of all the Species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term ''aperture'' is used for the main opening in gastropod shells, scaphopod shells, and also for ''Nautilus'' and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a ''gape''. Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. In gastropods In some prosobranch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Domain
The public domain (PD) consists of all the creative work A creative work is a manifestation of creative effort including fine artwork (sculpture, paintings, drawing, sketching, performance art), dance, writing (literature), filmmaking, and composition. Legal definitions Creative works require a cre ... to which no exclusive intellectual property rights apply. Those rights may have expired, been forfeited, expressly waived, or may be inapplicable. Because those rights have expired, anyone can legally use or reference those works without permission. As examples, the works of William Shakespeare, Ludwig van Beethoven, Leonardo da Vinci and Georges Méliès are in the public domain either by virtue of their having been created before copyright existed, or by their copyright term having expired. Some works are not covered by a country's copyright laws, and are therefore in the public domain; for example, in the United States, items excluded from copyright include the for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inundation
A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health. Human changes to the environment often increase the intensity and frequency of flooding, for example land use changes such as deforestation and removal of wetlands, changes in waterway course or flood controls such as with levees, and larger environmental issues such as climate change and sea level rise. In particular climate change's increased rainfall and extreme weather events increases the severity of other causes for flooding, resulting in more intense floods and increased flood risk. Flooding may occur as an overflow of water from water bodies, such as a river, lake, or ocean, in which the water overtops or breaks levees, resulting in some of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile River
The Mobile River is located in southern Alabama in the United States. Formed out of the confluence of the Tombigbee and Alabama rivers, the approximately river drains an area of of Alabama, with a watershed extending into Mississippi, Georgia, and Tennessee. Its drainage basin is the fourth-largest of primary stream drainage basins entirely in the United States. The river has historically provided the principal navigational access for Alabama. Since construction of the Tennessee-Tombigbee Waterway, it also provides an alternative route into the Ohio River watershed. The Tombigbee and Alabama River join to form the Mobile River approximately northeast of Mobile, along the county line between Mobile and Baldwin counties. The combined stream flows south, in a winding course. Approximately downstream from the confluence, the channel of the river divides, with the Mobile flowing along the western channel. The Tensaw River, a bayou of the Mobile River, flows alongside to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blount County, Alabama
Blount County is a county located in the U.S. state of Alabama. As of the 2020 census, the population was 59,134. Its county seat is Oneonta. Blount County is a moist county. In the November 6, 2012 elections, a countywide ballot initiative to allow alcohol sales was narrowly defeated, but Blountsville, Cleveland and Oneonta have allowed for the sale of alcohol since 2013. Blount County has been dubbed the "Covered Bridge Capital of Alabama" since it has more historic covered bridges standing within a single county than any other in the state - with earlier covered bridges known of. This county celebrates the Covered Bridge Festival every autumn in Oneonta to commemorate its three remaining covered bridges. History Blount County was created by the Alabama Territorial Legislature on February 6, 1818, formed from land ceded to the federal government by the Creek Nation on August 9, 1814. This county was named for Governor Willie Blount of Tennessee, who provided assistance to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson County, Alabama
Jefferson County is the List of counties in Alabama, most populous county in the U.S. state of Alabama, located in the central portion of the state. As of the 2020 United States census, 2020 census, its population was 674,721. Its county seat is Birmingham, Alabama, Birmingham. Its rapid growth as an industrial city in the 20th century, based on heavy manufacturing in steel and iron, established its dominance. Jefferson County is the central county of the Birmingham-Hoover, Alabama, Hoover, AL Birmingham metropolitan area, Alabama, Metropolitan Statistical Area. History Jefferson County was established on December 13, 1819, by the Alabama Legislature. It was named in honor of former President of the United States, President Thomas Jefferson. The county is located in the north-central portion of the state, on the southernmost edge of the Appalachian Mountains. It is in the center of the (former) iron, coal, and limestone mining belt of the Southern United States. Most of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Locust Fork Of The Black Warrior River
The Locust Fork River, in the U.S. State of Alabama, is one of three major tributaries of the Black Warrior River, stretching across Blount, and some portions of Etowah, Jefferson and Marshall counties. Its course (1) drains a watershed of and comprises challenging whitewater rapids popular with canoers and kayakers, as well as smooth water sections for tubing, and spots for sport fishing. Anglers hail some of those spots as among the best sport fishing in AL. The Locust Fork River ranks in the top 2% of the nation's free flowing rivers with “outstandingly remarkable values” in all seven categories of the Nationwide Rivers Inventory of the National Park Service, (https://www.nps.gov/subjects/rivers/alabama.htm). The Locust Fork is home to the nationally sanctioned annual Locust Fork Canoe and Kayak Races, http://alabamacupraces.com/races.html In the late 1980s, the Birmingham Water Works proposed damming the river as a source of drinking water. When those plans became p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tombigbee River
The Tombigbee River is a tributary of the Mobile River, approximately 200 mi (325 km) long, in the U.S. states of Mississippi and Alabama. Together with the Alabama, it merges to form the short Mobile River before the latter empties into Mobile Bay on the Gulf of Mexico. The Tombigbee watershed encompasses much of the rural coastal plain of western Alabama and northeastern Mississippi, flowing generally southward. The river provides one of the principal routes of commercial navigation in the southern United States, as it is navigable along much of its length through locks and connected in its upper reaches to the Tennessee River via the Tennessee-Tombigbee Waterway. The name "Tombigbee" comes from Choctaw ''/itumbi ikbi/'', meaning "box maker, coffin maker", from ''/itumbi/'', "box, coffin", and ''/ikbi/'', "maker". The river formed the eastern boundary of the historical Choctaw lands, from the 17th century when they coalesced as a people, to the forced Indian Removal b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Little Warrior River
Little Warrior River is a river in Blount County, Alabama. It is a tributary of the Locust Fork of the Black Warrior River The Locust Fork River, in the U.S. State of Alabama, is one of three major tributaries of the Black Warrior River, stretching across Blount, and some portions of Etowah, Jefferson and Marshall counties. Its course (1) drains a watershed of an .... The Little Warrior River forms near the town of Locust Fork at the confluence of the Calvert Prong and the Blackburn Fork. References Rivers of Alabama Rivers of Blount County, Alabama {{Alabama-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Warrior River
The Black Warrior River is a waterway in west-central Alabama in the southeastern United States. The river rises in the extreme southern edges of the Appalachian Highlands and flows 178 miles (286 km) to the Tombigbee River, of which the Black Warrior is the primary tributary. The river is named after the Mississippian culture, Mississippian paramount chief Chief Tuskaloosa, Tuskaloosa, whose name was Muskogean languages, Muskogean for 'Black Warrior'. The Black Warrior is impounded along nearly its entire course by a series of locks and dams to form a chain of reservoirs that not only provide a path for an inland waterway, but also yield hydroelectric power, drinking water, and industrial water. The river flows through the Black Warrior Basin, a region historically important for the extraction of coal and methane. The cities of Tuscaloosa, AL, Tuscaloosa and Northport, AL, Northport grew at the historical head of navigation at the fall line between the Appalachian Highlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Population Genetics
Population genetics is a subfield of genetics that deals with genetic differences within and between populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure. Population genetics was a vital ingredient in the emergence of the modern evolutionary synthesis. Its primary founders were Sewall Wright, J. B. S. Haldane and Ronald Fisher, who also laid the foundations for the related discipline of quantitative genetics. Traditionally a highly mathematical discipline, modern population genetics encompasses theoretical, laboratory, and field work. Population genetic models are used both for statistical inference from DNA sequence data and for proof/disproof of concept. What sets population genetics apart from newer, more phenotypic approaches to modelling evolution, such as evolutionary game theory and adaptive dynamics, is its emphasis on such genetic phenomena as dominance, epi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
