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Full-Text Articles in Animal Sciences
What We Know About Minnesota's First Endangered Fish Species: The Topeka Shiner, Jay T. Hatch
What We Know About Minnesota's First Endangered Fish Species: The Topeka Shiner, Jay T. Hatch
Journal of the Minnesota Academy of Science
The Topeka shiner, Notropis topeka, is the first of Minnesota's native ichthyofauna to be classified as federally endangered. The species is in serious decline in Kansas, Missouri, Nebraska and Iowa but is far more common in Minnesota than once was thought. At present, it is known from 89 sites in 17 streams of the Missouri River Drainage. Topeka shiners are multiple-clutch spawning nest associates of sunfishes and reproduce over an eight- to ten-week period between late May and early August. Mean clutch size is 261 to 284. Longevity is three years. Males grow faster than females, reaching longer mean total …
Siberian Tiger Species Survival Plan: A Strategy For Survival, U. S. Seal, T. F. Foose
Siberian Tiger Species Survival Plan: A Strategy For Survival, U. S. Seal, T. F. Foose
Journal of the Minnesota Academy of Science
The wild population of Siberian tigers (Panthera tigris altaica) is estimated at about 300 in six separate populations. Since an effective population size of at least 500 is necessary for long-term survival and evolution, and since the wild populations are not going to be able to expand in their natural habitat, it is evident that a captive breeding program is necessary for sustained preservation of this form. There are 1000 living Siberian tigers in zoos; only three outside of Russia are wild-born. About 250 are in North American zoos. Although about 68 wild-caught animals have been brought into zoos, six …