Publication: Evidence of non‑random mating in a colour polymorphic raptor, the Booted Eagle
Authors
Bosch, Josep ; Calvo Sendín, José Francisco ; Enrique Martínez, José ; Baiges, Claudi ; Mestre, Joan ; Jiménez Franco, María Victoria
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Publisher
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DOI
https://doi.org/10.1007/s10336-020-01763-y
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info:eu-repo/semantics/article
Description
©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted version of a Published Work that appeared in final form in Journal of Ornithology. To access the final edited and published work see https://doi.org/10.1007/s10336-020-01763-y
Abstract
Sexual selection and non-random mating are considered, among others, determinant mechanisms for the maintenance of
genetic colour polymorphism in some bird species. We analyse the mechanisms, which, in parallel with Mendelian inherit ance, may be acting in the maintenance and evolution of the morph ratio in a two-morph raptor species, using observational
data of successful breeding individuals and their ofspring from long-term studies conducted in three Spanish populations.
Our results showed that the dark ofspring produced in breeding events involving mixed-morph adult pairs far exceeds the
expected value under the Hardy–Weinberg equilibrium, especially in the case of pairs formed by a light male and a dark
female. In addition, the low number of dark eaglets born from pairs formed by light individuals (indistinctly homozygous or
heterozygous) indicates that the number of breeding events of heterozygous (both the male and female) light morph pairs,
was much lower than expected. As the plausible existence of a transmission ratio distortion phenomenon in heterozygous
light morph males does not, alone, explain the disproportionate number of dark eaglets observed, our results suggest that
one or two selective mating phenomena may be occurring in this polymorphic system. The frst one could be a disassortative
mating process whereby heterozygous light males preferentially mate with dark females, based on the imprint of the colour
morph of their mother. The second phenomenon would only afect light morph individuals, which would preferentially mate
with heterozygous individuals of the opposite sex, selected according to secondary sexual characteristics or behavioural
traits that are unknown at the moment
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Citation
Journal of Ornithology (2020) 161:849–857
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