November 2008 | Publisher: USGS | Science Center: Western Ecological Research Center (WERC, Sacramento) | Format: URL
www.werc.usgs.gov — Species distribution models are widely used, at multiple scales, to predict the geographical distribution of habitat suitability or species occurrence. Several studies have found that more accurate predictive models of species occurrences can be developed for rarer species. One recent study, however, found the relationship between range size and More...
Publisher: USGS | Science Center: National Wetlands Research Center (NWRC, Lafayette) | Format: URL
www.nwrc.usgs.gov — This report is a comprehensive summary of the status and trends of our nation's biological resources. The report describes the major processes and factors affecting biological resources, and it treats regional status and trends. Authors of the chapters and boxes in this two-volume report were drawn from federal and state agencies, universities, More...