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Full-Text Articles in Ecology and Evolutionary Biology
Chemosensory-Mediated Deposit Feeding In The Spionid Polychaete Dipolydora Quadrilobata., Timothy J. Riordan Jr.
Chemosensory-Mediated Deposit Feeding In The Spionid Polychaete Dipolydora Quadrilobata., Timothy J. Riordan Jr.
Electronic Theses and Dissertations
Deposit feeding organisms live and feed in marine soft-sediment habitats. This sediment makes up a majority of the material ingested by deposit feeders and contains a variety of edible material that may constitute their principal nutrient source. However, the specific components that are assimilated by these organisms, and the strategies they employ to efficiently collect those components, remain unclear. Sensory interactions between an organism and its surrounding environment typically play an important role in helping the organism detect and locate potential food. Accordingly, chemical sensing by deposit feeders is most likely involved in feeding, yet few specifics about this role …
In Support Of A Rationally Managed Fishery: Age And Growth In Patagonian Toothfish (Dissostichus Eleginoides), Julian R. Ashford
In Support Of A Rationally Managed Fishery: Age And Growth In Patagonian Toothfish (Dissostichus Eleginoides), Julian R. Ashford
Biological Sciences Theses & Dissertations
Patagonian toothfish (Dissostichus eleginoides) occur on the continental shelves and shelf breaks of southern South America and the Southern Ocean. Stock structure, critical to good fisheries management, can be inferred from growth differences between areas, but available growth data are compromised by inconsistencies in age estimation methods, sampling and sample sizes, and techniques used to derive estimates. I asked the scientific question: how is growth in Patagonian toothfish structured spatially within the Southern Ocean? I developed a multi-stage randomized design to sample fish caught by commercial longline, and an age estimation methodology. Because toothfish are difficult to age, …
Distribution, Morphometries, And Tooth Morphology Of The Genus Desmognathus In West Virginia, Jessica Ann Wooten
Distribution, Morphometries, And Tooth Morphology Of The Genus Desmognathus In West Virginia, Jessica Ann Wooten
Theses, Dissertations and Capstones
Very few genera of vertebrates demonstrate variation in body size, color, pattern, and life history traits to the extreme that is demonstrated in the genus Desmognathus. Exact distribution of Desmognathus, as well as other genera of salamanders, is very difficult to outline because of hybridization between certain desmognathine species. Tooth morphology, tail keeling, head and body shape, and geographic location are factors used in the separation among species in this genus. There are five desmognathine salamanders, including D. monticola, D. fuscus, D. ochrophaeus, D. quadramaculatus, and 0. welteri in West Virginia. The purpose of this study was to analyze the …
A Natural History Study Of Desmognathus Welteri In West Virginia, Zachary Ira Felix
A Natural History Study Of Desmognathus Welteri In West Virginia, Zachary Ira Felix
Theses, Dissertations and Capstones
The Black Mountain salamander, Desmognathus welteri, is a relatively large brownish-green salamander that possesses morphological characters associated with a semi-aquatic lifestyle. The history of this species in the state of West Virginia is an interesting one. Due to taxonomic confusion and the lack of a thorough investigation of the species in the state, little was known about the species until recently. Surveys for Desmognathus welteri in southern West Virginia revealed five new populations. This makes 17 localities for the species in the state. It appears D. welteri is restricted to relatively high elevation, high gradient, forested streams in the Cumberland …