| prevalence of aspergillus fumigatus in free-living goshawks (accipiter gentilis atricapillus). | during the fall migration of 1972 and 1973 unusually large numbers of goshawks (accipiter gentilis atricapillus) were counted at hawk ridge in duluth, minnesota. these birds were sampled for prevalence of fungi of the genus aspergillus. fungi of this genus were recovered from 26 of 49 birds (53%) in 1972 and 4 of 45 (7%) birds in 1973. aspergillosis was confirmed at necropsy in three wild goshawks in 1972, but none in 1973. the disease was further confirmed at necropsy in 8 of 12 (67%) goshawks ... | 1980 | 7001046 |
| 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 |
| effects of experimental food supplementation on movements of juvenile northern goshawks (accipiter gentilis atricapillus). | food availability is thought to strongly influence the leaving phase of natal dispersal in animals with condition-dependent dispersal. we conducted a food supplementation experiment to determine the influence of extra food on the onset of dispersal and early dispersal movement patterns of 42 radio-tagged northern goshawks (accipiter gentilis atricapillus) from 28 broods in north-central new mexico during 1992 and 1993. we randomly assigned half of the broods each year as treatments and the other ... | 2003 | 12647170 |