Little Evidence for Intralocus Sexual Conflict over the Optimal Intake of Nutrients for Life Span and Reproduction in the Black Field Cricket Teleogryllus Commodus

Overview

Journal Evolution

Publisher Oxford University Press

Specialty Biology

Date 2017 Jun 23

PMID 28640400

Citations 9

Authors

James Rapkin

C Ruth Archer

Charles E Grant

Kim Jensen

Clarissa M House

Alastair J Wilson

John Hunt

Affiliations

Soon will be listed here.

Abstract

There is often large divergence in the effects of key nutrients on life span (LS) and reproduction in the sexes, yet nutrient intake is regulated in the same way in males and females given dietary choice. This suggests that the sexes are constrained from feeding to their sex-specific nutritional optima for these traits. Here, we examine the potential for intralocus sexual conflict (IASC) over optimal protein and carbohydrate intake for LS and reproduction to constrain the evolution of sex-specific nutrient regulation in the field cricket, Teleogryllus commodus. We show clear sex differences in the effects of protein and carbohydrate intake on LS and reproduction and strong positive genetic correlations between the sexes for the regulated intake of these nutrients. However, the between-sex additive genetic covariance matrix had very little effect on the predicted evolutionary response of nutrient regulation in the sexes. Thus, IASC appears unlikely to act as an evolutionary constraint on sex-specific nutrient regulation in T. commodus. This finding is supported by clear sexual dimorphism in the regulated intake of these nutrients under dietary choice. However, nutrient regulation did not coincide with the nutritional optima for LS or reproduction in either sex, suggesting that IASC is not completely resolved in T. commodus.

Citing Articles

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