RELATING GROUSE NEST SUCCESS AND CORVID DENSITY TO HABITAT: A MULTI-SCALE APPROACH
| Autor: | Douglas L. Manzer, Susan J. Hannon |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
geography
geography.geographical_feature_category Ecology Grouse Tympanuchus Biology Generalist and specialist species biology.organism_classification Grassland Predation Habitat Nest General Earth and Planetary Sciences Ecological trap Ecology Evolution Behavior and Systematics Nature and Landscape Conservation General Environmental Science |
| Zdroj: | Journal of Wildlife Management. 69:110-123 |
| ISSN: | 1937-2817 0022-541X |
| DOI: | 10.2193/0022-541x(2005)069<0110:rgnsac>2.0.co;2 |
| Popis: | Predators are the major cause of nest failure for prairie grouse, and corvids are widespread generalist predators that exploit land altered by humans where grouse are found. We studied how human-caused habitat change affected predator and prey by using habitat variables to model nest selection, corvid density, and nest success for sharp-tailed grouse (Tympanuchus phasianellus) in Alberta, Canada, 1999–2001. Habitat was quantified over a range of extents (radius of observation) from 2 to 2,265 m. We predicted that habitat features associated with corvid density at broad extents would also relate to grouse nest success, and that nesting cover and the presence of avian predator perch sites would be important at smaller extents. Corvid density was higher in landscapes with higher proportions of crop and sparse grassland (1,600-m extent). Conversely, nest success was markedly higher (≥ 4 times) in landscapes with < 10% crop and < 35% crop and sparse grassland (aggregated) at broad extents (1,600 m). M... |
| Databáze: | OpenAIRE |
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