Nestling sex ratio in the Southwestern Willow Flycatcher

Eben H. Paxton, Mark K. Sogge, Tracy D. McCarthey, Paul S Keim

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)877-881
Number of pages5
JournalCondor
Volume104
Issue number4
StatePublished - Nov 2002

Fingerprint

nestling
sex ratio
breeding population
molecular genetics
subspecies
population size
gender
nest
nests
breeding
nestlings
Empidonax trailii extimus
methodology

Keywords

  • Empidonax traillii
  • Endangered species
  • Nestling sex ratio
  • Willow Flycatcher

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Paxton, E. H., Sogge, M. K., McCarthey, T. D., & Keim, P. S. (2002). Nestling sex ratio in the Southwestern Willow Flycatcher. Condor, 104(4), 877-881.

Nestling sex ratio in the Southwestern Willow Flycatcher. / Paxton, Eben H.; Sogge, Mark K.; McCarthey, Tracy D.; Keim, Paul S.

In: Condor, Vol. 104, No. 4, 11.2002, p. 877-881.

Research output: Contribution to journalArticle

Paxton, EH, Sogge, MK, McCarthey, TD & Keim, PS 2002, 'Nestling sex ratio in the Southwestern Willow Flycatcher', Condor, vol. 104, no. 4, pp. 877-881.
Paxton EH, Sogge MK, McCarthey TD, Keim PS. Nestling sex ratio in the Southwestern Willow Flycatcher. Condor. 2002 Nov;104(4):877-881.
Paxton, Eben H. ; Sogge, Mark K. ; McCarthey, Tracy D. ; Keim, Paul S. / Nestling sex ratio in the Southwestern Willow Flycatcher. In: Condor. 2002 ; Vol. 104, No. 4. pp. 877-881.
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