Patterns of sperm precedence and predictors of paternity in the Trinidadian guppy
Open Access
- 7 April 2001
- journal article
- Published by The Royal Society in Proceedings Of The Royal Society B-Biological Sciences
- Vol. 268 (1468) , 719-724
- https://doi.org/10.1098/rspb.2000.1577
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 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.Keywords
This publication has 36 references indexed in Scilit:
- ‘Sloppy’ sperm mixing and intraspecific variation in sperm precedence (P2) patternsProceedings Of The Royal Society B-Biological Sciences, 2000
- CRITERIA FOR DEMONSTRATING POSTCOPULATORY FEMALE CHOICEEvolution, 2000
- CRITERIA FOR DEMONSTRATING FEMALE SPERM CHOICEEvolution, 2000
- Geographic variation in multiple paternity within natural populations of the guppy (Poecilia reticulata)Proceedings Of The Royal Society B-Biological Sciences, 1999
- Sperm competition affects male behaviour and sperm output in the rainbow darterProceedings Of The Royal Society B-Biological Sciences, 1998
- Determinants of paternity in a butterflyProceedings Of The Royal Society B-Biological Sciences, 1998
- Risk of sperm competition directly affects ejaculate size in the Mediterranean fruit flyAnimal Behaviour, 1991
- Sperm competition games: raffles and rolesProceedings Of The Royal Society B-Biological Sciences, 1990
- SPERM COMPETITION AND ITS EVOLUTIONARY CONSEQUENCES IN THE INSECTSBiological Reviews, 1970
- Intraspecific Sperm Competition in Lebistes reticulatusThe American Naturalist, 1954