Temperature-induced developmental plasticity in Plodia interpunctella: reproductive behaviour and sperm length

Iossa, Graziella and Maury, Chloris and Fletcher, Rachel M. and Eady, Paul (2019) Temperature-induced developmental plasticity in Plodia interpunctella: reproductive behaviour and sperm length. Journal of Evolutionary Biology . ISSN 1010-061X

Full content URL: https://doi.org/10.1111/jeb.13447

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Temperature-induced developmental plasticity in Plodia interpunctella: reproductive behaviour and sperm length
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Abstract

In both plants and animals, male gametogenesis is particularly sensitive to heat stress, to the extent that a single hot or cold day can compromise crop productivity or population persistence. In animals, heat stress during development can impact a male’s ability to secure copulations and/or his post-copulatory fertility. Despite such observations, relatively few studies have examined the consequences of developmental temperature on the reproductive behaviour and physiology of males and females. Here we report for the first time the effects of developmental temperature on the phenotypic expression of both apyrene and eupyrene sperm and the copulatory behaviour of the Indian meal moth, Plodia interpunctella. We show that the length of both apyrene and eupyrene sperm decrease with increasing developmental temperature and that males are less likely to engage in copulation when reared at the highest and lowest temperatures. Where copulation occurred, the duration of copula decreased as male developmental temperature increased. We argue that identification of the mechanisms and consequences of reproductive failure in animals facing heat stress will help understand how wild and domesticated populations will respond to global climate change. We also contend that such studies will help elucidate long-standing evolutionary questions around the maintenance of genetic variation in traits highly relevant to fitness and the role of phenotypic plasticity in driving the evolution of novel traits.

Keywords:Apyrene sperm, eupyrene sperm, copulation duration, phenotypic plasticity, mating behaviour, primary reproductive traits, sperm heteromorphism, spermatophore, testes
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C142 Reproductive Biology
C Biological Sciences > C182 Evolution
Divisions:College of Science > School of Life Sciences
ID Code:35446
Deposited On:11 Apr 2019 14:22

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