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Full-Text Articles in Biology
Niche Overlap In Sympatric Rocio (Teleostei: Cichlidae) Of Guatemala, Cesar Estuardo Fuentes Montejo
Niche Overlap In Sympatric Rocio (Teleostei: Cichlidae) Of Guatemala, Cesar Estuardo Fuentes Montejo
College of Science and Health Theses and Dissertations
Rocio is a small genus of Neotropical freshwater fishes that is distributed in Atlantic drainages of northern Middle America. Two species in the genus exhibit sympatry in the Río Dulce basin (in Izabal, Guatemala), where one species is endemic (R. spinosissima), while the other only includes this area as part of a larger geographic range (R. octofasciata). Unfortunately, the ecology of these species has been poorly studied. This study sought to determine the ecological and morphological differences between these two closely related sympatric freshwater fishes. We hypothesized that R. octofasciata would exhibit greater ecological and morphological …
Comparison Of Feeding Functional Morphology Development In North American Esocids, Cheryl Theile
Comparison Of Feeding Functional Morphology Development In North American Esocids, Cheryl Theile
Master's Theses
Esocidae is a family of freshwater fishes within order Esociformes known for its long, cylindrical bodies, duck-bill snouts, and an impressive number of sharp teeth. There are four species, including two subspecies, in North America with areas of overlap of their geographic distribution. These ambush predators change diets from invertebrate prey to vertebrate prey during their first year of life, and the timing of this shift varies between species. In particular, the sister species Esox lucius (Northern Pike) and Esox masquinongy (Muskellunge) overlap in the upper Midwest, but E. masquinongy transitions to a vertebrate diet sooner in its development than …
Changes In The Diet Of Lake Trout (Salvelinus Namaycush) In Near-Shore Lake Michigan With The Invasion Of The Round Goby (Neogobius Melanostomus): 1995-2005, Marybeth Kathryn Brey
Changes In The Diet Of Lake Trout (Salvelinus Namaycush) In Near-Shore Lake Michigan With The Invasion Of The Round Goby (Neogobius Melanostomus): 1995-2005, Marybeth Kathryn Brey
Masters Theses
The predator-prey base of the Great Lakes has been altered since the early 1900's, with the majority of these changes occurring due to invasive species such as the sea lamprey (Petromyzon marinus), alewife (Alosa pseudoharangus), and rainbow smelt (Osmerus mordax). These changes have forced large piscivorous fish to find alternate prey species. One predator, the lake trout (Salvelinus namaychush) has experienced a series of diet shifts in the last century, due to a changing prey base. In recent years the Great Lakes, particularly Lake Michigan has experience a new invader, the round goby (Neogobius melanostomus), which has colonized the …