The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks.

Kaufmann, J., Eizaguirre, Christophe, Milinski, M. and Lenz, T. L. (2015) The contribution of post-copulatory mechanisms to incipient ecological speciation in sticklebacks. Biology Letters, 11 (1). p. 20140933. DOI 10.1098/rsbl.2014.0933.

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Supplementary data:

Abstract

Ecology can play a major role in species diversification. As individuals are adapting to contrasting habitats, reproductive barriers may evolve at multiple levels. While pre-mating barriers have been extensively studied, the evolution of post-mating reproductive isolation during early stages of ecological speciation remains poorly understood. In diverging three-spined stickleback ecotypes from two lakes and two rivers, we observed differences in sperm traits between lake and river males. Interestingly, these differences did not translate into ecotype-specific gamete precedence for sympatric males in competitive in vitro fertilization experiments, potentially owing to antagonistic compensatory effects. However, we observed indirect evidence for impeded development of inter-ecotype zygotes, possibly suggesting an early stage of genetic incompatibility between ecotypes. Our results show that pre-zygotic post-copulatory mechanisms play a minor role during this first stage of ecotype divergence, but suggest that genetic incompatibilities may arise at early stages of ecological speciation.

Document Type: Article
Additional Information: WOS:000370669200013
Keywords: ecological speciation; gamete precedence; Gasterosteus aculeatus; fertilization success; ecotype;
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1098/rsbl.2014.0933
ISSN: 1744-9561
Related URLs:
Date Deposited: 03 Feb 2015 09:49
Last Modified: 17 Jun 2016 12:13
URI: http://oceanrep.geomar.de/id/eprint/27270

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