Filters: Tags: Ecology (X)2,358 results (46ms)
We undertook a demographic analysis of the Yellowstone grizzly bears (Ursus arctos) to identify critical environmental factors controlling grizzly bear vital rates, and thereby to help evaluate the effectiveness of past management and to identify future conservation issues. We concluded that, within the limits of uncertainty implied by the available data and our methods of data analysis, the size of the Yellowstone grizzly bear population changed little from 1975 to 1995. We found that grizzly bear mortality rates are about double in years when the whitebark pine crop fails than in mast years, and that the population probably declines when the crop fails and increases in mast years. Our model suggests that natural...
Palynology and paleoecology of lignites from the Manning Formation (Jackson Group) outcrop in the Lake Somerville spillway of east-central Texas
Are carbon taxes the best tool to implement the Kyoto commitments, a comment on Stephen Smith's paper
Phosphorus research strategies to meet agricultural and environmental challenges of the 21st century
Contaminant exposure and effects - terrestrial vertebrates database: trends and data gaps for Atlantic coast estuaries