AI Article Synopsis
- The higher energetic cost of reproduction in females is traditionally seen as the main reason for female preference in males with elaborate traits.
- New research on Siamese fighting fish suggests that males may actually prefer female conspecifics more than females prefer male conspecifics.
- This suggests that in some species, males may incur higher costs related to mating, challenging the idea that female choice is more important for creating behavioral isolation between species.
Article Abstract
The higher energetic cost related to female gamete investment is classically considered the driving force behind sexual selection. This asymmetric cost of reproduction is thought to cause female preference for elaborate male ornamentation. Subsequent co-evolution of female preferences and male ornaments is thought then to lead to a greater preference for conspecific mates in females as compared to males. Thus, female choice is classically assumed to contribute more than male choice to behavioral isolation between sexually dimorphic species. However, this hypothesis fails to account for the cost of maintaining a territory, building a nest, courtship displays, ornament investment, and parental care, as seen in males of the Siamese fighting fish, Betta splendens. Here we show that male B. splendens have a greater preference for female conspecifics than females have for male conspecifics, when given a choice between conspecifics and the allopatric Betta imbellis. We hypothesize that in B. splendens, the cost of mating may be higher for males than females, and predict that male choice would contribute to behavioral isolation upon secondary contact of wild populations.
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| http://dx.doi.org/10.1016/j.beproc.2018.02.024 | DOI Listing |
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