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Osmoregulation And Salinity Preference In Juvenile Sandbar Sharks (Carcharhinus Plumbeus) In Winyah Bay, Sc, Usa, Jessica Wingar
Osmoregulation And Salinity Preference In Juvenile Sandbar Sharks (Carcharhinus Plumbeus) In Winyah Bay, Sc, Usa, Jessica Wingar
Electronic Theses and Dissertations
Juvenile sandbar sharks (Carcharhinus plumbeus) have been caught in salinities ranging from 7 – 40. In Winyah Bay, a partially mixed estuary in Northeast SC, juvenile sandbar sharks tidally alternate between higher tides in middle bay and lower tides in lower bay. To assess salinity preference and duration in eight acoustically-tagged juvenile sandbar sharks in different salinities, acoustic receivers with salinity loggers were placed throughout Winyah Bay. Juvenile sandbar sharks were caught in salinities from 17.2 to 36.1 and acoustic detections were recorded from 11.5 to 24.7 by salinity loggers in middle bay. Smaller juvenile sandbar sharks used lower salinities, …
Unique Osmoregulatory Morphology In Primitive Sharks: An Intermediate State Between Holocephalan And Derived Shark Secretory Morphology, Matthew Eric Larsen
Unique Osmoregulatory Morphology In Primitive Sharks: An Intermediate State Between Holocephalan And Derived Shark Secretory Morphology, Matthew Eric Larsen
Electronic Theses and Dissertations
Discovery of an unusual rectal gland in the Atlantic sixgill shark, Hexanchus vitulus, led to examination of rectal glands in 29 species of epipelagic and deep-sea sharks. Eight of 14 deep-sea species of sharks had digitiform glands that were previously assumed to be characteristic of elasmobranchs (N=281; mean width-length ratio ± SD = 0.18 ± 0.07). Hematoxylin-and-eosin stained sections from deep-sea sharks were similar to those from shallow water sharks. Glands from the family Somniosidae were kidney bean-shaped (N = 3; mean width-length ratio ± SD = 0.46 ± 0.05); whereas those from the families Echinorhinidae and Hexanchidae appeared lobulate …