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Sperm allocation in relation to female size in a semelparous salmonid

To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities. Therefore, in mating contexts where males must choose among females i...

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Autores principales: Makiguchi, Yuya, Ichimura, Masaki, Kitayama, Takenori, Kawabata, Yuuki, Kitagawa, Takashi, Kojima, Takahito, Pitcher, Trevor E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5210678/
https://www.ncbi.nlm.nih.gov/pubmed/28083096
http://dx.doi.org/10.1098/rsos.160497
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author Makiguchi, Yuya
Ichimura, Masaki
Kitayama, Takenori
Kawabata, Yuuki
Kitagawa, Takashi
Kojima, Takahito
Pitcher, Trevor E.
author_facet Makiguchi, Yuya
Ichimura, Masaki
Kitayama, Takenori
Kawabata, Yuuki
Kitagawa, Takashi
Kojima, Takahito
Pitcher, Trevor E.
author_sort Makiguchi, Yuya
collection PubMed
description To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities. Therefore, in mating contexts where males must choose among females in a short period of time, as is the case with semelparous species (which die after one intensely competitive short duration breeding season), selection on sperm allocation can be expected to be a powerful selective agent that shapes the male reproductive success. We quantitatively investigated sperm allocation patterns in chum salmon in relation to perceived female quality by developing a novel method for determining the amount of sperm allocated per ejaculate during spawning bouts. We examined the relationship between sperm expenditure and the body size of paired females (a proxy of egg number and egg quality) in the absence of male–male competition in an experimental channel. The estimated amount of sperm released per spawning event was positively correlated with the size of paired females. However, the number of spawning events a female participated in, which reduces the number of eggs she spawns in each subsequent bout, did not affect this relationship. These results provide support for predictions arising from the sperm allocation hypothesis, male salmon do economize their sperm expenditure in accordance with paired female body size as predicted for their first spawning event, but males overestimate or are unable to assess the quality of females beyond size and provide more sperm than they should in theory when paired with a female that spawned previously. Overall, the observed sperm allocation pattern in chum salmon appears to be adapted to maximize reproductive success assuming female size is an honest indicator of quality, although temporal changes in a female's quality during a reproductive season should be considered when examining sperm allocation strategies.
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spelling pubmed-52106782017-01-12 Sperm allocation in relation to female size in a semelparous salmonid Makiguchi, Yuya Ichimura, Masaki Kitayama, Takenori Kawabata, Yuuki Kitagawa, Takashi Kojima, Takahito Pitcher, Trevor E. R Soc Open Sci Biology (Whole Organism) To maximize reproductive success, males have to adaptively tailor their sperm expenditure in relation to the quality of potential mates because they require time to replenish their sperm supply for subsequent mating opportunities. Therefore, in mating contexts where males must choose among females in a short period of time, as is the case with semelparous species (which die after one intensely competitive short duration breeding season), selection on sperm allocation can be expected to be a powerful selective agent that shapes the male reproductive success. We quantitatively investigated sperm allocation patterns in chum salmon in relation to perceived female quality by developing a novel method for determining the amount of sperm allocated per ejaculate during spawning bouts. We examined the relationship between sperm expenditure and the body size of paired females (a proxy of egg number and egg quality) in the absence of male–male competition in an experimental channel. The estimated amount of sperm released per spawning event was positively correlated with the size of paired females. However, the number of spawning events a female participated in, which reduces the number of eggs she spawns in each subsequent bout, did not affect this relationship. These results provide support for predictions arising from the sperm allocation hypothesis, male salmon do economize their sperm expenditure in accordance with paired female body size as predicted for their first spawning event, but males overestimate or are unable to assess the quality of females beyond size and provide more sperm than they should in theory when paired with a female that spawned previously. Overall, the observed sperm allocation pattern in chum salmon appears to be adapted to maximize reproductive success assuming female size is an honest indicator of quality, although temporal changes in a female's quality during a reproductive season should be considered when examining sperm allocation strategies. The Royal Society Publishing 2016-12-14 /pmc/articles/PMC5210678/ /pubmed/28083096 http://dx.doi.org/10.1098/rsos.160497 Text en © 2016 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Biology (Whole Organism)
Makiguchi, Yuya
Ichimura, Masaki
Kitayama, Takenori
Kawabata, Yuuki
Kitagawa, Takashi
Kojima, Takahito
Pitcher, Trevor E.
Sperm allocation in relation to female size in a semelparous salmonid
title Sperm allocation in relation to female size in a semelparous salmonid
title_full Sperm allocation in relation to female size in a semelparous salmonid
title_fullStr Sperm allocation in relation to female size in a semelparous salmonid
title_full_unstemmed Sperm allocation in relation to female size in a semelparous salmonid
title_short Sperm allocation in relation to female size in a semelparous salmonid
title_sort sperm allocation in relation to female size in a semelparous salmonid
topic Biology (Whole Organism)
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5210678/
https://www.ncbi.nlm.nih.gov/pubmed/28083096
http://dx.doi.org/10.1098/rsos.160497
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