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Environmental diel variation, parasite loads, and local population structuring of a mixed-mating mangrove fish

Ellison, Amy, Wright, Patricia, Taylor, D. Scott, Cooper, Chris, Regan, Kelly, Currie, Suzie and Consuegra, Sofia 2012. Environmental diel variation, parasite loads, and local population structuring of a mixed-mating mangrove fish. Ecology and Evolution 2 (7) , pp. 1682-1695. 10.1002/ece3.289

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Abstract

Genetic variation within populations depends on population size, spatial structuring, and environmental variation, but is also influenced by mating system. Mangroves are some of the most productive and threatened ecosystems on earth and harbor a large proportion of species with mixed-mating (self-fertilization and outcrossing). Understanding population structuring in mixed-mating species is critical for conserving and managing these complex ecosystems. Kryptolebias marmoratus is a unique mixed-mating vertebrate inhabiting mangrove swamps under highly variable tidal regimes and environmental conditions. We hypothesized that geographical isolation and ecological pressures influence outcrossing rates and genetic diversity, and ultimately determine the local population structuring of K. marmoratus. By comparing genetic variation at 32 microsatellites, diel fluctuations of environmental parameters, and parasite loads among four locations with different degrees of isolation, we found significant differences in genetic diversity and genotypic composition but little evidence of isolation by distance. Locations also differed in environmental diel fluctuation and parasite composition. Our results suggest that mating system, influenced by environmental instability and parasites, underpins local population structuring of K. marmoratus. More generally, we discuss how the conservation of selfing species inhabiting mangroves and other biodiversity hotspots may benefit from knowledge of mating strategies and population structuring at small spatial scales.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Wiley-Blackwell
ISSN: 2045-7758
Date of First Compliant Deposit: 6 December 2016
Last Modified: 04 Jun 2017 09:29
URI: http://orca-mwe.cf.ac.uk/id/eprint/95753

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