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Full-Text Articles in Life Sciences
Long-Term Effects Of Elevated Manganese On Procambarus Clarkii Behavior, Cody W. Lambert
Long-Term Effects Of Elevated Manganese On Procambarus Clarkii Behavior, Cody W. Lambert
Theses, Dissertations and Capstones
Manganese is a prominent heavy metal within the earth’s crust and a micro mineral essential for biological function, however, high level exposure may lead to neurological defects. Industrial activities allow elevated manganese (Mn2+)to enter air and waterways. The Environmental Protection Agency (EPA) implements secondary standards for aesthetics in drinking water at 0.05 ppm Mn2+, although evidence indicates levels at, or below this concentration negatively impact aquatic life. Crayfish (Procambarus clarkii) were exposed to environmentally relevant Mn2+ concentrations for 6 months, while the control group was kept in reconstituted fresh water for the same time period. …
Monitoring The Land Cover Change In The Historic Range Of Cambarus Veteranus In West Virginia Using A 1973-2013 Landsat Time Series, Emma Martha Arneson
Monitoring The Land Cover Change In The Historic Range Of Cambarus Veteranus In West Virginia Using A 1973-2013 Landsat Time Series, Emma Martha Arneson
Theses, Dissertations and Capstones
The crayfish Cambarus veteranus is near extinction in its historic range of the Upper Guyandotte River watershed. The biggest threats to C. veteranus are mining and road construction. Mining has been a continuous activity in the southern coalfields where the crayfish has historically been found, yet little is known about how much land cover change the practice has done to the region. Crayfish act as important organisms within aquatic ecosystems and without them, those systems are often degraded. Quantifying the change in land cover is important to understanding threats to C. veteranus for future protection of the crayfish and its …
The Natural Life History Of Cambarus (Puncticambarus) Smilax, The Greenbrier Crayfish, Paul William Hughes
The Natural Life History Of Cambarus (Puncticambarus) Smilax, The Greenbrier Crayfish, Paul William Hughes
Theses, Dissertations and Capstones
The natural life history of Cambarus (Puncticambarus) smilax, the Greenbrier Crayfish, was studied in West Fork of the Greenbrier River and in Thorny Creek, a tributary of the main stem of the Greenbrier River. The Greenbrier Crayfish gets its name from the Greenbrier River watershed where it is thought to occur exclusively. Among described members of the subgenus Puncticambarus, C. smilax is a sister taxon most similar to Cambarus (Puncticambarus) robustus. Monthly collections were made within the two study sites, from August 2010 to July 2011. Collecting techniques included dip-netting, seine-netting, and hand collecting. Cambarus smilax and all other species …
The Crayfishes Of West Virginia’S Southwestern Coalfields Region With An Emphasis On The Life History Of Cambarus Theepiensis, David Allen Foltz Ii
The Crayfishes Of West Virginia’S Southwestern Coalfields Region With An Emphasis On The Life History Of Cambarus Theepiensis, David Allen Foltz Ii
Theses, Dissertations and Capstones
Crayfish are the third most endangered faunal group in the world behind freshwater snails and unionid mussels. A better understanding of each species’ life history is vital in order to aid in crayfish conservation; however, little to no life history information is available for most crayfish. Recently, an undescribed species of crayfish, Cambarus theepiensis, was discovered in the Cumberland Mountains of West Virginia and Eastern Kentucky. In conjunction with the species’ scientific description, life history data was collected from May 2012 through April 2013 from two sites located within the Twelvepole watershed of southwestern West Virginia. Animals were collected monthly …
Dietary Preference Of The Queensnake (Regina Septemvittata), Timothy J. Brust
Dietary Preference Of The Queensnake (Regina Septemvittata), Timothy J. Brust
Theses, Dissertations and Capstones
The Queensnake (Regina septemvittata) is a small secretive water snake found throughout the eastern United States. Once common, their numbers have declined to the extent that they are now threatened throughout most of their range, largely the result of pollutant-based reduction in prey species. These snakes are assumed to eat molted crayfish exclusively. For some common crayfish species, molting happens only twice a summer during a two- week period. It has not been documented if Queensnakes eat anything besides crayfish on a regular basis. The purpose of this study was to determine the prey preference of Queensnakes with particular focus …
The Status And Distribution Of Invasive Crayfishes And Their Effects On Native Crayfish Communities In West Virginia, Casey David Swecker
The Status And Distribution Of Invasive Crayfishes And Their Effects On Native Crayfish Communities In West Virginia, Casey David Swecker
Theses, Dissertations and Capstones
Introductions of non-native crayfish species have resulted in the global decline of native crayfish populations, including those in North America. The last large survey of crayfishes from West Virginia was in 1988 and 1989. In this thorough document Raymond Jezerinac, Whitney Stocker, and Donald Tarter identified three separate areas in West Virginia where non-native crayfish species have been introduced. One area is located in the Potomac River drainage in northeastern West Virginia commonly referred to as the eastern panhandle of the state. This is also the only drainage in West Virginia where the native spiny cheek crayfish (Orconectes limosus) occurs. …
Dopamine Modulates The Lateral Giant Neuron And Serotonergic Facilitation In Crayfish, Joshua Scott Titlow
Dopamine Modulates The Lateral Giant Neuron And Serotonergic Facilitation In Crayfish, Joshua Scott Titlow
Theses, Dissertations and Capstones
The lateral giant (LG) neural circuit is a model system used to study the function of individual neurons. The LG circuit is part of a tail flip escape reflex that is a defensive behavior for crayfish. This thesis begins by addressing the effects of dopamine (DA), a neurotransmitter involved in normal and abnormal behaviors of most animals. Here it is shown that dopamine decreases the excitability of the LG neuron, a trigger for the escape reflex. An electrophysiology protocol was used to mimic sensory input to the LG neuron. Stimulating a sensory nerve in the last ganglion with an electrode …