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

Proceedings. Biological Sciences
J P Evans, A E Magurran

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 (P2) and the results revealed a bimodal distribution with either first or (more often) second male priority The observed P2 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 P2 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 per...Continue Reading

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Citations

Nov 3, 2004·Proceedings of the National Academy of Sciences of the United States of America·Andrea S Aspbury, Caitlin R Gabor
Jun 27, 2008·The Journal of Heredity·Leigh W SimmonsJonathan P Evans
Jun 25, 2002·Proceedings. Biological Sciences·Andrea PilastroAngelo Bisazza
Aug 12, 2003·Proceedings. Biological Sciences·Trevor E PitcherLocke Rowe
Apr 3, 2004·Proceedings. Biological Sciences·Amanda BretmanTom Tregenza
Aug 6, 2004·Proceedings. Biological Sciences·S A Becher, A E Magurran
Aug 13, 2004·Proceedings. Biological Sciences·Dustin J MarshallJonathan P Evans
Sep 29, 2004·Proceedings. Biological Sciences·Jonathan P EvansAndrea Pilastro
Sep 9, 2006·Proceedings. Biological Sciences·A M Ludlow, A E Magurran
May 28, 2010·Proceedings. Biological Sciences·Jonathan P Evans
Apr 27, 2012·Proceedings. Biological Sciences·A South, S M Lewis
Jun 7, 2013·Proceedings. Biological Sciences·Andrés López-SepulcreDavid N Reznick
Jun 28, 2006·BMC Evolutionary Biology·Laura S CorleyAndrew Pomiankowski
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Jan 24, 2013·PloS One·Sabine Nöbel, Klaudia Witte
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