Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.

Sperm morphology is generally uniform within a species due to selective pressures that act to achieve better fertilization outcomes under postcopulatory competitive circumstances. Therefore, polyandry that intensifies post-mating sperm competition should constrain intraspecific sperm polymorphism. C...

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Autores principales:	Noritaka Hirohashi, Noriyosi Sato, Yoko Iwata, Satoshi Tomano, Md Nur E Alam, Lígia Haselmann Apostólico, José Eduardo Amoroso Rodriguez Marian
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f0f6ccc88d6d46999c65a8b900528beb
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spelling	oai:doaj.org-article:f0f6ccc88d6d46999c65a8b900528beb2021-12-02T20:19:20ZContext-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.1932-620310.1371/journal.pone.0256745https://doaj.org/article/f0f6ccc88d6d46999c65a8b900528beb2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0256745https://doaj.org/toc/1932-6203Sperm morphology is generally uniform within a species due to selective pressures that act to achieve better fertilization outcomes under postcopulatory competitive circumstances. Therefore, polyandry that intensifies post-mating sperm competition should constrain intraspecific sperm polymorphism. Contrary to this paradigm, we previously found that a polyandrous squid, Heterololigo bleekeri, produces dimorphic eusperm (flagellum length dimorphism; FLD), which is closely associated with alternative reproductive tactics (ARTs); large males (consorts) transfer their spermatophores inside the female's mantle cavity, while small males (sneakers) do so outside the mantle. Thus, FLD was considered as the consequence of different insemination strategies that arise from different modes of sperm competition, sperm storage and the fertilization environment. However, in other squid species showing ARTs, the choice of mating behaviour is rather conditional (i.e., switching mating tactic between consorts and sneakers), which poses the question of whether sperm FLD could have evolved. Here, we investigated five species in the family Loliginidae that exhibit ARTs and found that all species showed sneaker-biased FLD. However, in a species with conditional ARTs, we found FLD rather ambiguous and the testicular somatic index to be nearly continuous among individuals at transitional state, suggesting that plasticity in mating behaviour compromises the disruptive selection on a sperm morphological trait.Noritaka HirohashiNoriyosi SatoYoko IwataSatoshi TomanoMd Nur E AlamLígia Haselmann ApostólicoJosé Eduardo Amoroso Rodriguez MarianPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 8, p e0256745 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Noritaka Hirohashi Noriyosi Sato Yoko Iwata Satoshi Tomano Md Nur E Alam Lígia Haselmann Apostólico José Eduardo Amoroso Rodriguez Marian Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
description	Sperm morphology is generally uniform within a species due to selective pressures that act to achieve better fertilization outcomes under postcopulatory competitive circumstances. Therefore, polyandry that intensifies post-mating sperm competition should constrain intraspecific sperm polymorphism. Contrary to this paradigm, we previously found that a polyandrous squid, Heterololigo bleekeri, produces dimorphic eusperm (flagellum length dimorphism; FLD), which is closely associated with alternative reproductive tactics (ARTs); large males (consorts) transfer their spermatophores inside the female's mantle cavity, while small males (sneakers) do so outside the mantle. Thus, FLD was considered as the consequence of different insemination strategies that arise from different modes of sperm competition, sperm storage and the fertilization environment. However, in other squid species showing ARTs, the choice of mating behaviour is rather conditional (i.e., switching mating tactic between consorts and sneakers), which poses the question of whether sperm FLD could have evolved. Here, we investigated five species in the family Loliginidae that exhibit ARTs and found that all species showed sneaker-biased FLD. However, in a species with conditional ARTs, we found FLD rather ambiguous and the testicular somatic index to be nearly continuous among individuals at transitional state, suggesting that plasticity in mating behaviour compromises the disruptive selection on a sperm morphological trait.
format	article
author	Noritaka Hirohashi Noriyosi Sato Yoko Iwata Satoshi Tomano Md Nur E Alam Lígia Haselmann Apostólico José Eduardo Amoroso Rodriguez Marian
author_facet	Noritaka Hirohashi Noriyosi Sato Yoko Iwata Satoshi Tomano Md Nur E Alam Lígia Haselmann Apostólico José Eduardo Amoroso Rodriguez Marian
author_sort	Noritaka Hirohashi
title	Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
title_short	Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
title_full	Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
title_fullStr	Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
title_full_unstemmed	Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
title_sort	context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/f0f6ccc88d6d46999c65a8b900528beb
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Context-dependent behavioural plasticity compromises disruptive selection of sperm traits in squid.

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