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High Levels of Multiple Paternity in Littorina saxatilis: Hedging the Bets?

Artikel i vetenskaplig tidskrift
Författare Tuuli Mäkinen
Marina Panova
Carl André
Publicerad i The Journal of heredity
Volym 98
Nummer/häfte 7
Sidor 705-11
ISSN 0022-1503
Publiceringsår 2007
Publicerad vid Institutionen för marin ekologi, Tjärnö marinbiologiska laboratorium
Institutionen för marin ekologi
Sidor 705-11
Språk en
Länkar dx.doi.org/10.1093/jhered/esm097
Ämnesord evolution, marin ekologi
Ämneskategorier Ekologi

Sammanfattning

The mating system of a species can have great effects on its genetic structure and evolution. We studied the extent of multiple paternity in a gastropod with internal fertilization, the intertidal snail Littorina saxatilis. Paternal genotype reconstruction based on microsatellite markers was performed on the offspring of wild, naturally fertilized females from 2 populations. The numbers of males contributing to the offspring per female were among the highest detected in invertebrates so far, with the exception of social insects. No reproductive skew in favor of males that were genetically more distant from the females was detected, and the pattern of fertilization appeared random. The result fits a hypothesis of indiscriminate mating, with genetic bet hedging as the most likely explanation. Bet hedging may have evolved as a form of inbreeding avoidance, if the snails are not able to recognize relatives. However, nutritional benefits from sperm or sexual conflict with males are additional possibilities that remain to be assessed in this species. Whatever the causes, such high levels of multiple paternity are remarkable and are likely to have a large impact on population structure and dynamics in a species in which migration between populations is spurious.

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