Developmental effects of visual environment on species-assortative mating preferences in Lake Victoria cichlid fish

Wright, D. S.; Demandt, N.; Alkema, J. T.; Seehausen, Ole; Groothuis, T. G. G.; Maan, Martine (2016). Developmental effects of visual environment on species-assortative mating preferences in Lake Victoria cichlid fish. Journal of Evolutionary Biology, 30(2), pp. 289-299. Wiley 10.1111/jeb.13001

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Local adaptation can be a potent force in speciation, with environmental heterogeneity leading to niche specialization and population divergence. However, local adaption often requires nonrandom mating to generate reproductive isolation. Population divergence in sensory properties can be particularly consequential in speciation, affecting both ecological adaptation and sexual communication. Pundamilia pundamila and Pundamilia nyererei are two closely related African cichlid species that differ in male coloration, blue vs. red. They co-occur at rocky islands in southern Lake Victoria, but inhabit different depth ranges with different light environments. The species differ in colour vision properties, and females exert species-specific preferences for blue vs. red males. Here, we investigated the mechanistic link between colour vision and preference, which could provide a rapid route to reproductive isolation. We tested the behavioural components of this link by experimentally manipulating colour perception – we raised both species and their hybrids under light conditions mimicking shallow and deep habitats – and tested female preference for blue and red males under both conditions. We found that rearing light significantly affected female preference: shallow-reared females responded more strongly to P. pundamilia males and deep-reared females favoured P. nyererei males – implying that visual development causally affects mate choice. These results are consistent with sensory drive predictions, suggesting that the visual environment is key to behavioural isolation of these species. However, the observed plasticity could also make the species barrier vulnerable to environmental change: speciesassortative preferences were weaker in females that were reared in the other species’ light condition.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Seehausen, Ole and Maan, Martine

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1010-061X

Publisher:

Wiley

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

19 Jan 2017 17:25

Last Modified:

05 Feb 2017 01:31

Publisher DOI:

10.1111/jeb.13001

PubMed ID:

27770466

BORIS DOI:

10.7892/boris.91002

URI:

https://boris.unibe.ch/id/eprint/91002

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