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Ecology Of Glacial Relict Fishes In South Dakota's Sandhills Region, Eli Felts
Ecology Of Glacial Relict Fishes In South Dakota's Sandhills Region, Eli Felts
Electronic Theses and Dissertations
Native stream fish zoogeography has changed substantially across North America during the last century as habitat degradation, stream fragmentation and introductions of nonnative species have led to numerous extinctions, extirpations and altered distributions. Insufficient information regarding imperiled species often results in reactive, rather than proactive, management, and knowledge of species status and ecology is critical in identifying conservation priorities. South Dakota populations of three dace species (northern redbelly dace Chrosomus eos, finescale dace Chrosomus neogaeus, and pearl dace Margariscus margarita) are relict of Pleistocene Glaciation and are isolated from the northern core of their distribution, but little information exists regarding …
Sauger Population Ecology In Three Missouri River Mainstem Reservoirs, Brian D. S. Graeb
Sauger Population Ecology In Three Missouri River Mainstem Reservoirs, Brian D. S. Graeb
Electronic Theses and Dissertations
Sauger Sander canadensis populations have experienced widespread declines across much of their range. Factors suspected to contribute to these declines include hybridization, exploitation, loss of spawning areas, and general habitat alterations associated with regulated rivers. Several sauger populations within the Missouri River basin are also experiencing similar declines, particularly in the headwaters of Montana, and the lower basin states of Nebraska and Missouri. However, sauger populations in many of the reservoirs in South Dakota (between Montana and the lower basin) have relatively stable populations. Given the paucity of information on factors influencing sauger population ecology in general, and Missouri River …