| 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. |
| Genre: | Article |
| ProdID: | 1016305 |
| Citation Author: | Paxton, E. H.; Sogge, M. K.; McCarthey, Tracy; Keim, Paul |
| Citation Contributing Office: | Forest and Rangeland Ecosystem Science Center |
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| Citation End Page: | 881 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | The Condor |
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| Citation Month: | NOV |
| Citation No Pagination: | |
| Citation Number Of Pages: | 5 |
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| Citation Phsyical Description: | p. 877-881 |
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| Citation Search Results Text: | Nestling sex ratios in the southwestern willow flycatcher; 2002; Article; Journal; The Condor; Paxton, E. H.; Sogge, M. K.; McCarthey, Tracy; Keim, Paul |
| Citation Start Page: | 877 |
| Citation Volume: | 104 |
| Citation Year: | 2002 |
| Type: | citation/reference |
| Text: | Nestling sex ratios in the southwestern willow flycatcher; 2002; Article; Journal; The Condor; Paxton, E. H.; Sogge, M. K.; McCarthey, Tracy; Keim, Paul |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 2002 00:00 -0600 |
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