| 文件类型： |
文章 |
| 所有的著者/提供者： |
Brad G Hill; M Ross Lein |
| ISSN: | 0004-8038 |
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| OCLC号码： |
485051935 |
| 语言注释： |
English |
| 注意： |
Fig. 1. Territory boundaries of Black-capped Chickadees and Mountain Chickadees in 1983. (A) As determined by the minimum convex polygon method. (B) As determined by Anderson's utilization distribution method.
Fig. 2. Territory boundaries of Black-capped Chickadees and Mountain Chickadees in 1984. (A) As determined by the minimum convex polygon method. (B) As determined by Anderson's utilization distribution method. |
| 奖励： |
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摘要：
We examined territorial relationships of breeding Black-capped Chickadees (Parus atricapillus) and Mountain Chickadees (P. gambeli) in the foothills of the Rocky Mountains in southwestern Alberta, where the two species are sympatric in mixed forests of river valleys. Both the minimum convex polygon method and Anderson's (1982) utilization distribution method indicated that territory size did not differ significantly between species. There was no indication of interspecific territoriality, with little intraspecific overlap of territories (0-8%) but considerable interspecific overlap (30-70%). Discriminant function analysis of habitat variables measured on randomly located plots on territories showed no interspecific differences. However, an analysis that weighted plots by relative use by birds showed a significant difference. Mountain Chickadees used areas with large conifers and dead trees more than did Black-capped Chickadees. Our results indicate that habitat preferences shown by the two species in allopatry persist in sympatry, and that local coexistence is permitted by the mosaic nature of the habitat.
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文章 : 英语