Patterns of sperm precedence and predictors of paternity in the Trinidadian guppy

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114 Citations (Scopus)

Abstract

Despite its widespread occurrence in animals, sperm competition has been studied in a limited range of taxa. Among the most neglected groups in this respect are internally fertilizing fish in which virtually nothing is known about the dynamics of sperm competition. In this study, we examined the outcome of sperm competition when virgin female guppies mated with two males. Behavioural cues were used to ensure that each male mated once (with female cooperation) and that sperm were successfully inseminated at copulation. Two polymorphic microsatellite loci were used to estimate the proportion of offspring sired by the second male (P-2) and the results revealed a bimodal distribution with either first or (more often) second male priority. The observed P-2 distribution differed from that expected under the 'fair raffle' model of sperm competition. Random sperm mixing is therefore unlikely to account for the observed variance in P-2 in this study. A further aim of our study was to identify predictors of male reproductive success. Using logistic linear modelling, we found that the best predictors of paternity were time to remating and the difference in courtship display rate between first and second males. Males that mated quickly and performed relatively high numbers of sigmoid displays obtained greater parentage than their slower and less vigorous counterparts. Since females are attracted to high-displaying males, our results suggest that female choice may facilitate sperm competition and/or sperm choice in guppies.

Original languageEnglish
Pages (from-to)719-724
Number of pages6
JournalProceedings of the Royal Society of London Series B: Biological Sciences
Volume268
Issue number1468
DOIs
Publication statusPublished - 7 Apr 2001

Keywords

  • Poecilia reticulata
  • poeciliid
  • guppies
  • sperm competition
  • P-2
  • POSTCOPULATORY FEMALE CHOICE
  • POECILIA-RETICULATA
  • EJACULATE CHARACTERISTICS
  • NATURAL-POPULATIONS
  • MULTIPLE PATERNITY
  • SEXUAL SELECTION
  • MALE-BEHAVIOR
  • COMPETITION
  • RISK
  • CRITERIA

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