Genetic monogamy despite social promiscuity in the pot-bellied seahorse (Hippocampus abdominalis)

Publication Type: Journal Article

Year of Publication: 2007

Authors: Wilson, AB, Martin-Smith KM

Journal: Molecular Ecology

Volume: 16

Issue: 11

Pagination: 2345 - 2352

Date Published: 06/2007

ISSN: 1365-294X

Keywords: mating system, microsatellite genotyping, sex-role reversal, Syngnathidae, traditional sex roles


Sexual selection theory predicts a positive correlation between relative parental investment and mate choice. In syngnathid fishes (seahorses and pipefish), males brood offspring in specialized brooding structures. While female-female mating competition has been demonstrated in some pipefishes, all seahorses (genus
Hippocampus ) studied to date have been found to have conventional sex roles with greater male–male competition for access to mates despite possessing the most complex brood structures in the family. Although multiple mating is common in pipefish, seahorses are again exceptional, exhibiting strict genetic monogamy. Both demographic and behavioural explanations have been offered to explain the lack of multiple mating in seahorse species, but these hypotheses have not yet been explicitly addressed. We investigated mating systems and brood parentage of the pot-bellied seahorse, Hippocampus abdominalis, a temperate-water species that is socially
promiscuous with conventional sex roles in laboratory populations. We observed promiscuous courtship behaviour and sex-role reversal in high density, female-biased field populations of H. abdominalis. We hypothesize that sex roles are plastic in
H. abdominalis, depending on local population density and sex ratio. Despite promiscuous courtship behaviour, all assayed male seahorses were genetically monogamous in both laboratory and wild populations. Physiological limitations associated with embryo incubation may explain the absence of multiple mating in seahorses and may have played an important role in the development of the unique reproductive behaviour typical in these species.

DOI: 10.1111/j.1365-294X.2007.03243.x

Short Title: Mol Ecol