The evolution of genetic and conditional alternative reproductive tactics

Proceedings. Biological Sciences
Leif Engqvist, Michael Taborsky

Abstract

Frequency-dependent selection may drive adaptive diversification within species. It is yet unclear why the occurrence of alternative reproductive tactics (ARTs) is highly divergent between major animal taxa. Here we aim to clarify the environmental and social conditions favouring the evolution of intra-population variance of male reproductive phenotypes. Our results suggest that genetically determined ARTs that are fixed for life evolve when there is strong selection on body size due to size-dependent competitiveness, in combination with environmental factors reducing size benefits. The latter may result from growth costs or, more generally, from age-dependent but size-independent mortality causes. This generates disruptive selection on growth trajectories underlying tactic choice. In many parameter settings, the model also predicts ARTs to evolve that are flexible and responsive to current conditions. Interestingly, the conditions favouring the evolution of flexible tactics diverge considerably from those favouring genetic variability. Nevertheless, in a restricted but relevant parameter space, our model predicts the simultaneous emergence and maintenance of a mixture of multiple tactics, both genetically and conditionally det...Continue Reading

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Citations

Oct 26, 2016·The Journal of Animal Ecology·Loreto A CorreaLuis A Ebensperger
May 10, 2017·The Journal of Animal Ecology·Petri T Niemelä, Niels J Dingemanse
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Aug 15, 2019·Ecology and Evolution·Luca CorlattiBruno Bassano
Apr 11, 2020·Ecology and Evolution·Jeanette B MossMark E Welch
Oct 13, 2020·Proceedings. Biological Sciences·Sarah E Nason, Clint D Kelly
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Jan 28, 2021·Proceedings. Biological Sciences·Xiang-Yi LiWolfgang Goymann
Jun 9, 2021·Journal of Evolutionary Biology·Marie Claire CheliniDanielle L Edwards
Dec 8, 2021·Evolution; International Journal of Organic Evolution·Jane M Reid, Paul Acker

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