Life Sciences Commons^™

Species Richness Gradients Of Oak Forest Plants Along The Missouri River In Nebraska And Iowa, Steven B. Rolfsmeier

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

The upland deciduous forests of the Missouri River valley contain many plants typical of forests to the east of this area, which are assumed to have migrated northward and westward along the river in postglacial times. Previous workers have reported a gradient of decreasing species richness upstream among woody species, which is suggested to be the result of climatic gradients and differential dispersal capabilities of the immigrant species. Floristic work on all vascular species in eight woodland sites along the Nebraska-Iowa border quantifies the presence of similar gradients for herbaceous species, but of differing degrees. These studies also reveal the …

The Nebraska Natural Heritage Program: Two Year Progress Report, Mary Clausen, Mike Fritz, Gerry Steinauer

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

Since European settlement, human activities have totally eliminated the natural vegetation from approximately 50 percent of Nebraska’s landscape, and of that remaining most has been heavily impacted. As a result, numerous plants and animals have been extirpated from the state and many others are threatened.

The destruction of Nebraska’s natural diversity resulted in both public and private conservation groups recognizing the need for a centralized and accessible biological database for the state’s rare species and natural community types. Toward this end, the Nebraska Natural Heritage Program (NENHP) was established in August, 1987 through a cooperative effort between The Nature Conservancy …

Selected Bibliography On Diseases And Parasites Of Fishes: Books, Proceedings, And Reviews, 1978-1989, Joyce A. Mann

United States Fish and Wildlife: Staff Publications

This bibliography was prepared to assist students of fish health, fishery biologists, librarians, and others in selecting reading materials or developing library collections on the diseases and parasites of fishes. A continuation of Fish Disease Leaflet 53, "Diseases and parasites of fish: an annotated bibliography of books and symposium, 1904-1977," it includes English language books, proceedings, and review articles published from 1978 to 1989. It includes references that are readily available by purchase or through interlibrary loan. The references are arranged alphabetically by author surname and then by year within the following major subject classifications: general works, bacterial diseases, histology, …

Selenium In The Aquatic Environment Of Quivira National Wildlife Refuge In 1987, R. Mark Wilson, George T. Allen

United States Fish and Wildlife: Staff Publications

Selenium is a widely distributed element generally found at low concentrations in surface waters and soils (Cooper et. al. 1974. Kubota 1980. Raptis et. al. 1983. Trelease 1945). Selenium has received recent attention from the Department of the Interior and the U.S. Fish and Wildlife Service (Service) because high levels of selenium borne by irrigation return flows have caused serious problems for fish and wildlife (Clark 1987. Hoffman et. al. 1988. Lemly 1987. Ohlendorf et. al. 1986a,b, 1987, 1988, Saiki and Lowe 1987). Because selenium concentrations can occur in coal deposits, ash from coal-fired powerplants has caused serious selenium contamination …