| habitat classification modeling with incomplete data: pushing the habitat envelope. | habitat classification models (hcms) are invaluable tools for species conservation, land-use planning, reserve design, and metapopulation assessments, particularly at broad spatial scales. however, species occurrence data are often lacking and typically limited to presence points at broad scales. this lack of absence data precludes the use of many statistical techniques for hcms. one option is to generate pseudo-absence points so that the many available statistical modeling tools can bb used. tr ... | 2007 | 17913135 |
| selective predation on utah prairie dogs. | predation always affects demography and population dynamics, but removal of certain types of individuals is especially consequential. predators strike quickly and commonly avoid areas with human observers, however, and thereby make it difficult to document patterns of predation under natural conditions. at a colony of marked utah prairie dogs (cynomys parvidens), a high frequency of predation in 2005 provided an unusual opportunity to examine susceptibility of five types of individuals to predat ... | 2006 | 17004225 |