Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.

In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual selection). Sperm competition theory predicts a n...

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Autores principales:	Paolo Galeotti, Guido Bernini, Lisa Locatello, Roberto Sacchi, Mauro Fasola, Diego Rubolini
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/30acc32951a248aeb824016b1e3a60cd
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spelling	oai:doaj.org-article:30acc32951a248aeb824016b1e3a60cd2021-11-18T07:08:09ZSperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.1932-620310.1371/journal.pone.0043771https://doaj.org/article/30acc32951a248aeb824016b1e3a60cd2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22916304/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual selection). Sperm competition theory predicts a negative relationship between investment in body traits favouring mate acquisition (secondary sexual characters, SSCs) and investment in ejaculate size or quality, due to the inherent costs of sperm production. In contrast, the phenotype-linked fertility hypothesis posits that male fertilizing efficiency is reliably reflected by the phenotypic expression of male SSCs, allowing females to obtain direct benefits by selecting more ornamented males as copulation partners. In this study, we investigated the relationships between male SSCs and size and quality (viability and longevity) of ejaculates allocated to females in mating trials of the freshwater crayfish Austropotamobius italicus. We showed that the relative size of male weapons, the chelae, was negatively related to ejaculate size, and that chelae asymmetry, resulting from regeneration of lost chelipeds, negatively covaried with sperm longevity. Moreover, males allocated more viable sperm to mates from their own rather than different stream of origin. Our findings thus suggest that, according to sperm competition theory, pre-copulatory sexual selection for large weapons used in male fighting may counteract post-copulatory sperm competition in this crayfish species, and that investment in cheliped regeneration may impair ejaculate quality.Paolo GaleottiGuido BerniniLisa LocatelloRoberto SacchiMauro FasolaDiego RuboliniPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 8, p e43771 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Paolo Galeotti Guido Bernini Lisa Locatello Roberto Sacchi Mauro Fasola Diego Rubolini Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
description	In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates (pre-copulatory sexual selection) and ability of their ejaculates to outcompete those of other males (post-copulatory sexual selection). Sperm competition theory predicts a negative relationship between investment in body traits favouring mate acquisition (secondary sexual characters, SSCs) and investment in ejaculate size or quality, due to the inherent costs of sperm production. In contrast, the phenotype-linked fertility hypothesis posits that male fertilizing efficiency is reliably reflected by the phenotypic expression of male SSCs, allowing females to obtain direct benefits by selecting more ornamented males as copulation partners. In this study, we investigated the relationships between male SSCs and size and quality (viability and longevity) of ejaculates allocated to females in mating trials of the freshwater crayfish Austropotamobius italicus. We showed that the relative size of male weapons, the chelae, was negatively related to ejaculate size, and that chelae asymmetry, resulting from regeneration of lost chelipeds, negatively covaried with sperm longevity. Moreover, males allocated more viable sperm to mates from their own rather than different stream of origin. Our findings thus suggest that, according to sperm competition theory, pre-copulatory sexual selection for large weapons used in male fighting may counteract post-copulatory sperm competition in this crayfish species, and that investment in cheliped regeneration may impair ejaculate quality.
format	article
author	Paolo Galeotti Guido Bernini Lisa Locatello Roberto Sacchi Mauro Fasola Diego Rubolini
author_facet	Paolo Galeotti Guido Bernini Lisa Locatello Roberto Sacchi Mauro Fasola Diego Rubolini
author_sort	Paolo Galeotti
title	Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
title_short	Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
title_full	Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
title_fullStr	Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
title_full_unstemmed	Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
title_sort	sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/30acc32951a248aeb824016b1e3a60cd
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Sperm traits negatively covary with size and asymmetry of a secondary sexual trait in a freshwater crayfish.

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