FACTORS AFFECTING WHICH MALE RED-WINGED BLACKBIRDS ACQUIRE TERRITORIES

被引:16
作者
BELETSKY, LD [1 ]
ORIANS, GH [1 ]
机构
[1] UNIV WASHINGTON,INST ENVIRONM STUDIES,SEATTLE,WA 98195
来源
CONDOR | 1993年 / 95卷 / 04期
关键词
TERRITORY ACQUISITION; NATAL DISPERSAL; FLOATERS; RED-WINGED BLACKBIRDS; AGELAIUS PHOENICEUS; BIRTH DATE;
D O I
10.2307/1369417
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
We use data from a 14-year study of dispersal, territoriality, and breeding success to investigate territory acquisition in male Red-winged Blackbirds (Agelaius phoeniceus). Males born in our study area that we later detected breeding had dispersed an average of about 1,400 m and had traversed an average of 25 territories between natal and breeding sites. Our data indicate that all or most males that bred within our study area were probably born no more than 5 km away. Some natal-year cohorts contributed disproportionately to the population of male breeders, suggesting that population structure influenced territory ownership. Most males that obtained territories did so when two years old (their first adult year), but a significant fraction spent at least one adult year as nonterritorial floaters. Our results are consistent with the hypothesis that familiarity with particular areas contributes to territory ownership, but we found no evidence that Resource Holding Potential is a prime determinant of territory acquisition. Chance events may also strongly influence ability to gain a territory.
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页码:782 / 791
页数:10
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