| Abstract: | We studied dispersal in a color-banded population of the Groove-billed Ani (Crotophaga sulcirostris) in Costa Rica. Eight percent of the young alive at the end of the breeding season bred on their natal territories the next year and 4% remained but did not breed. Thirteen percent dispersed successfully within the study area and bred in communal groups or simple pairs. The remaining 75% of the young birds disappeared from the study area. Young males remained in the study area as breeders more frequently than did young females. Breeding dispersal occurred, with at least 9% of the adult population moving to a new territory each year.We used a demographic model to estimate the following dispersal fates for young birds. For both males and females, 62% of the young alive at the end of the breeding season in which they hatched obtained a breeding position the next year. Of those that dispersed from their natal territories, 59 to 70% of the males and 64 to 74% of the females obtained breeding positions. Of those that bred the year after they hatched, 22% of the males and 2% of the females bred in their natal units, 34% of the males and 6% of the females bred within the study area but outside their natal units, and 44% of the males and 92% of the females bred outside the study area. We estimated that all of the males and 28% of the females that bred the year after they hatched were within three territories of their natal sites. |
| Genre: | Article |
| ProdID: | 1001800 |
| Citation Author: | Bowen, B. S.; Koford, R. R.; Vehrencamp, S. L. |
| Citation Contributing Office: | Northern Prairie Wildlife Research Center |
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| Citation End Page: | 64 |
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| Citation Language: | English |
| Citation Larger Work Title: | Condor |
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| Citation Number Of Pages: | 12 |
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| Citation Phsyical Description: | p. 52-64 |
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| Citation Search Results Text: | Dispersal in the communally breeding groove-billed ani (Crotophaga sulcirostris); 1989; Article; Journal; Condor; Bowen, B. S.; Koford, R. R.; Vehrencamp, S. L. |
| Citation Start Page: | 52 |
| Citation Volume: | 91 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Dispersal in the communally breeding groove-billed ani (Crotophaga sulcirostris); 1989; Article; Journal; Condor; Bowen, B. S.; Koford, R. R.; Vehrencamp, S. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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