Dispersal in the communally breeding groove-billed ani (Crotophaga sulcirostris)
Condor
By: B. S. Bowen, Rolf R. Koford, and S.L. Vehrencamp
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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.
Suggested Citation
Bowen, B.S., Koford, R.R., Vehrencamp, S., 1989, Dispersal in the communally breeding groove-billed ani (Crotophaga sulcirostris): Condor, v. 91, p. 52-64, https://doi.org/10.2307/1368148.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Dispersal in the communally breeding groove-billed ani (Crotophaga sulcirostris) |
| Series title | Condor |
| DOI | 10.2307/1368148 |
| Volume | 91 |
| Year Published | 1989 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Northern Prairie Wildlife Research Center |
| Description | 13 p. |
| First page | 52 |
| Last page | 64 |