Nest Reuse by Northern Spotted Owls on the East Slope of the Cascade Range, Washington
| Autor: | Eric D. Forsman, Stan G. Sovern, Margaret Taylor |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Northwestern Naturalist. 92:101-106 |
| ISSN: | 1938-5315 1051-1733 |
| DOI: | 10.1898/10-01.1 |
| Popis: | During a long-term demography study of Northern Spotted Owls (Strix occidentalis caurina) in the eastern Cascade Range of Washington State in 1989 to 2008, we documented 276 nests of Northern Spotted Owls at 73 different territories. Of these nests, 90.2% were on platforms, mostly in clumps of deformed limbs caused by dwarf mistletoe (primarily Arceuthobium douglasii), and 9.8% were in cavities in trees. Of the nests associated with dwarf mistletoe, 8.4% were nests built by other raptors and 91.6% were either natural accumulations of debris or debris accumulated by other birds or mammals. Owls switched nests between nesting attempts 81.2% of the time. The presence of a new male or female at a territory did not affect the odds of switching nests between nesting attempts. The odds an owl would reuse a nest were 6 times greater for owls that were successful in the previous nesting attempt compared to owls that were unsuccessful, given the same type of nest structure. The odds an owl would reuse a ca... |
| Databáze: | OpenAIRE |
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