Interactions of a single species (population) or an association of different species (community) occupying a particular region, including their biotic and abiotic environments.
Descriptions of Columbia Environmental Research Center's multidisciplinary research capabilities used in various ecological studies of large river floodplains, coastal habitats, wetlands, streams, and lakes.
Web site for an Internet Map Service (IMS) serving base cartographic data, USGS data, science applications and real time modelling analyses for the Columbia River basin using geospatial analysis technology.
The information provided in the CEE-TV database profiles available geo-referenced information on contaminant exposure and effects in terrestrial vertebrates along the U. S. coasts. The database utilizes Microsoft's Access 2000 for Windows.
Report with mini-movie and photos on the hypothesis that the atmospheric transport of dust arising from the desertification in northern Africa led to algal infestation of corals, coral diseases, and the near extinction of associated sea urchins.
Describes biological soil crusts, with special reference to their role in resisting soil erosion, improving soil fertility, and increasing water infiltration in the deserts of the Colorado Plateau region.
Links to research studies, conservation information, and general information on desert tortoises at the Western Ecological Research Center in Sacramento, California.
Article from Wildlife Monographs no. 100 (1988) on the relationships of wetland habitat dynamics and life history to the breeding distributions of the various species of ducks with information on research methods and references.
Use of diatoms in biostratigraphy, coastal and estuarine studies, paleoceanology, paleoliminology, earthquake studies, environmental quality and forensic studies. Includes listing of USGS diatom projects and links to other diatom websites.
Maps of the ranges of tree species in North America compiled by Elbert Little and others were digitized for use in USGS vegetation and climate modeling studies. Can be downloaded as ArcView shapefiles and in PDF graphic files.
U.S. Department of the Interior |
U.S. Geological Survey