期刊
BEHAVIORAL ECOLOGY
卷 25, 期 3, 页码 -出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/beheco/aru024
关键词
assortative mating; cichlid; hue; mate choice; teleost fish
资金
- Swiss National Science Foundation (Schweizer Nationalfond) [31003A-118293, PZ00P3-126340]
- Swiss National Science Foundation (SNF) [31003A-118293, PZ00P3_126340] Funding Source: Swiss National Science Foundation (SNF)
A critical step for speciation in the face of gene flow is the origination of reproductive isolation. The evolution of assortative mating greatly facilitates this process. Assortative mating can be mediated by one or multiple cues across an array of sensory modalities. We here explore possible cues that may underlie female mate choice in a sympatric species pair of cichlid fish from Lake Victoria, Pundamilia pundamilia and Pundamilia nyererei. Previous studies identified species-specific female preferences for male coloration, but effects of other cues could not be ruled out. Therefore, we assessed female choice in a series of experiments in which we manipulated visual (color) and chemical cues. We show that the visibility of differences in nuptial hue (i.e., either blue or red) between males of the 2 species is necessary and sufficient for assortative mating by female mate choice. Such assortment mediated by a single cue may evolve relatively quickly, but could make reproductive isolation vulnerable to environmental changes. These findings confirm the important role of female mate choice for male nuptial hue in promoting the explosive speciation of African haplochromine cichlids.
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