thumbnail

Nestling sex ratios in the southwestern willow flycatcher

The Condor

By:
, , , and

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Nestling sex ratios in the southwestern willow flycatcher
Series title:
The Condor
Volume
104
Issue:
4
Year Published:
2002
Language:
English
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
p. 877-881
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
The Condor
First page:
877
Last page:
881
Number of Pages:
5