Sensory-based quantification of male colour patterns in Trinidadian guppies reveals no support for parallel phenotypic evolution in multivariate trait space.

Autor: Yong L; Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Penryn, UK., Croft DP; Centre for Research in Animal Behaviour, College of Life and Environmental Sciences, University of Exeter, Exeter, UK., Troscianko J; Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Penryn, UK., Ramnarine IW; Department of Life Sciences, The University of The West Indies, St Augustine, Trinidad and Tobago., Wilson AJ; Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Penryn, UK.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2022 Mar; Vol. 31 (5), pp. 1337-1357. Date of Electronic Publication: 2021 Jul 04.
DOI: 10.1111/mec.16039
Abstrakt: Parallel evolution, in which independent populations evolve along similar phenotypic trajectories, offers insights into the repeatability of adaptive evolution. Here, we revisit a classic example of parallelism, that of repeated evolution of brighter males in the Trinidadian guppy (Poecilia reticulata). In guppies, colonisation of low predation habitats is associated with emergence of 'more colourful' phenotypes since predator-induced viability selection for crypsis weakens while sexual selection by female preference for conspicuousness remains strong. Our study differs from previous investigations in three respects. First, we adopted a multivariate phenotyping approach to characterise parallelism in multitrait space. Second, we used ecologically-relevant colour traits defined by the visual systems of the two selective agents (i.e., guppy, predatory cichlid). Third, we estimated population genetic structure to test for adaptive (parallel) evolution against a model of neutral phenotypic divergence. We find strong phenotypic differentiation that is inconsistent with a neutral model but very limited support for the predicted pattern of greater conspicuousness at low predation. Effects of predation regime on each trait were in the expected direction, but weak, largely nonsignificant, and explained little among-population variation. In multitrait space, phenotypic trajectories of lineages colonising low from high predation regimes were not parallel. Our results are consistent with reduced predation risk facilitating adaptive differentiation, potentially by female choice, but suggest that this proceeds in independent directions of multitrait space across lineages. Pool-sequencing data also revealed SNPs showing greater differentiation than expected under neutrality, among which some are found in genes contributing to colour pattern variation, presenting opportunities for future genetic study.
(© 2021 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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