Passive sperm loss and patterns of sperm precedence in Muscovy Ducks (Cairina moschata)

Sarah M. Stai, William Searcy

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigated the importance of passive sperm loss in the outcome of sperm competition in captive, wild-type Muscovy Ducks (Cairina moschata). In nature, Muscovy Ducks can be expected to experience more intense sperm competition than most other waterfowl because of their non-monogamous mating system. We estimated the instantaneous rate of sperm loss from the reproductive tracts of female Muscovy Ducks as 0.0235 ± 0.0018 h-1 [SE], a fairly typical rate in comparison to the few other species of birds in which passive sperm loss has been measured. We also measured sperm precedence in trials in which a captive female was allowed to mate with two males in succession, with either a 24-h or a 72-h lag between matings. Paternity was determined with microsatellite markers. The mean proportion of a female's eggs fertilized by the second male (P2) was 0.72 ± 0.14 in trials with the 24-h lag and 0.42 ± 0.13 in trials with the 72-h lag. The last-male precedence observed in the 24-h trials can be explained by a quantitative model in which passive sperm loss alone determines average success, but this model is not consistent with the outcome of the 72-h trials. Other factors, including perhaps postcopulatory female choice, must be acting in addition to passive sperm loss in the trials with the longer lag.

Original languageEnglish
Pages (from-to)495-502
Number of pages8
JournalAuk
Volume127
Issue number3
DOIs
StatePublished - Jul 1 2010

Fingerprint

Cairina moschata
sperm
spermatozoa
sperm competition
waterfowl
paternity
mating systems
reproductive strategy
loss
trial
microsatellite repeats
egg
bird
birds

Keywords

  • Cairina moschata
  • Muscovy Ducks
  • passive sperm loss
  • sperm competition
  • sperm precedence
  • waterfowl

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Passive sperm loss and patterns of sperm precedence in Muscovy Ducks (Cairina moschata). / Stai, Sarah M.; Searcy, William.

In: Auk, Vol. 127, No. 3, 01.07.2010, p. 495-502.

Research output: Contribution to journalArticle

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