The effect of experimental hybridization on cognition and brain anatomy: Limited phenotypic variation and transgression in Poeciliidae.

Autor: Vila-Pouca C; Behavioural Ecology Group, Wageningen University & Research, Wageningen, 6700 HB, The Netherlands., De Waele H; Behavioural Ecology Group, Wageningen University & Research, Wageningen, 6700 HB, The Netherlands., Kotrschal A; Behavioural Ecology Group, Wageningen University & Research, Wageningen, 6700 HB, The Netherlands.
Jazyk: angličtina
Zdroj: Evolution; international journal of organic evolution [Evolution] 2022 Dec; Vol. 76 (12), pp. 2864-2878. Date of Electronic Publication: 2022 Oct 10.
DOI: 10.1111/evo.14644
Abstrakt: Hybridization can promote phenotypic variation and often produces trait combinations distinct from the parental species. This increase in available variation can lead to the manifestation of functional novelty when new phenotypes bear adaptive value under the environmental conditions in which they occur. Although the role of hybridization as a driver of variation and novelty in traits linked to fitness is well recognized, it remains largely unknown whether hybridization can fuel behavioral novelty by promoting phenotypic variation in brain morphology and/or cognitive traits. To address this question, we investigated the effect of hybridization on brain anatomy, learning ability, and cognitive flexibility in first- and second-generation hybrids of two closely related fish species (Poecilia reticulata and Poecilia wingei). Overall, we found that F1 and F2 hybrids showed intermediate brain morphology and cognitive traits compared to parental groups. Moreover, as phenotypic dispersion and transgression were low for both brain and cognitive traits, we suggest that hybridization is not a strong driver of brain anatomical and cognitive diversification in these Poeciliidae. To determine the generality of this conclusion, hybridization experiments with cognitive tests need to be repeated in other families.
(© 2022 The Authors. Evolution published by Wiley Periodicals LLC on behalf of The Society for the Study of Evolution.)
Databáze: MEDLINE
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