Nestling sex ratio in the Southwestern Willow Flycatcher
Condor
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Abstract
Using molecular-genetic techniques, we determined the gender of 202 Southwestern Willow Flycatcher (Empidonax traillii extimus) nestlings from 95 nests sampled over a five-year period. Overall nestling sex ratio did not vary significantly from 50:50 among years, by clutch order, or by mating strategy (monogamous vs. polygamous pairings). However, we did observe significant differences among the four sites sampled, with sex ratios biased either toward males or females at the different sites. Given the small population sizes and geographic isolation of many of the endangered subspecies' breeding populations, sex-ratio differences may have localized negative impacts.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Nestling sex ratio in the Southwestern Willow Flycatcher |
| Series title | Condor |
| DOI | 10.1093/condor/104.4.877 |
| Volume | 104 |
| Issue | 4 |
| Year Published | 2002 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Forest and Rangeland Ecosys Science Center |
| Description | 5 p. |
| First page | 877 |
| Last page | 881 |
| Country | United States |
| State | Arizona |
| Other Geospatial | Roosevelt Lake, San Pedro River, Verde River, White Mountains |
| Google Analytic Metrics | Metrics page |