Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans

Abstract In cephalopods, all species are considered to be polyandrous because of their common life history and reproductive traits reflecting a polyandrous mating system. Contrary to this belief, here we show several lines of evidence for monogamy in the firefly squid, Watasenia scintillans. In this...

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Autores principales:	Noriyosi Sato, Sei-Ichiro Tsuda, Md. Nur E. Alam, Tomohiro Sasanami, Yoko Iwata, Satoshi Kusama, Osamu Inamura, Masa-aki Yoshida, Noritaka Hirohashi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/00596c49627e4ddea1da5f4621d9d03c
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spelling	oai:doaj.org-article:00596c49627e4ddea1da5f4621d9d03c2021-12-02T16:31:53ZRare polyandry and common monogamy in the firefly squid, Watasenia scintillans10.1038/s41598-020-68006-12045-2322https://doaj.org/article/00596c49627e4ddea1da5f4621d9d03c2020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-68006-1https://doaj.org/toc/2045-2322Abstract In cephalopods, all species are considered to be polyandrous because of their common life history and reproductive traits reflecting a polyandrous mating system. Contrary to this belief, here we show several lines of evidence for monogamy in the firefly squid, Watasenia scintillans. In this species, females are capable of long-term storage of spermatangia, and of egg spawning even after the complete disappearance of males following the breeding season. The stored spermatangia are distributed equally between bilateral pouches under the female’s neck collar. Such a nonrandom pattern of sperm storage prompted us to hypothesize that females might engage in lifetime monandry. Hence, we genotyped female-stored spermatangia and offspring, and found that in 95% of females (18/19), all the spermatangia had been delivered from a single male and all the embryos in a clutch had been sired by spermatozoa from stored spermatangia. In males, throughout the reproductive season, relative testis mass was much smaller in W. scintillans than in all other cephalopods examined previously. The mean number of male-stored spermatophores was ~ 30, equivalent to only 2.5 matings. Our genetic, demographic and morphometrical data agree with a mathematical model predicting that monogyny is favored when potential mates are scarce. Together, these results suggest mutual monogamy in W. scintillans.Noriyosi SatoSei-Ichiro TsudaMd. Nur E. AlamTomohiro SasanamiYoko IwataSatoshi KusamaOsamu InamuraMasa-aki YoshidaNoritaka HirohashiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Noriyosi Sato Sei-Ichiro Tsuda Md. Nur E. Alam Tomohiro Sasanami Yoko Iwata Satoshi Kusama Osamu Inamura Masa-aki Yoshida Noritaka Hirohashi Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
description	Abstract In cephalopods, all species are considered to be polyandrous because of their common life history and reproductive traits reflecting a polyandrous mating system. Contrary to this belief, here we show several lines of evidence for monogamy in the firefly squid, Watasenia scintillans. In this species, females are capable of long-term storage of spermatangia, and of egg spawning even after the complete disappearance of males following the breeding season. The stored spermatangia are distributed equally between bilateral pouches under the female’s neck collar. Such a nonrandom pattern of sperm storage prompted us to hypothesize that females might engage in lifetime monandry. Hence, we genotyped female-stored spermatangia and offspring, and found that in 95% of females (18/19), all the spermatangia had been delivered from a single male and all the embryos in a clutch had been sired by spermatozoa from stored spermatangia. In males, throughout the reproductive season, relative testis mass was much smaller in W. scintillans than in all other cephalopods examined previously. The mean number of male-stored spermatophores was ~ 30, equivalent to only 2.5 matings. Our genetic, demographic and morphometrical data agree with a mathematical model predicting that monogyny is favored when potential mates are scarce. Together, these results suggest mutual monogamy in W. scintillans.
format	article
author	Noriyosi Sato Sei-Ichiro Tsuda Md. Nur E. Alam Tomohiro Sasanami Yoko Iwata Satoshi Kusama Osamu Inamura Masa-aki Yoshida Noritaka Hirohashi
author_facet	Noriyosi Sato Sei-Ichiro Tsuda Md. Nur E. Alam Tomohiro Sasanami Yoko Iwata Satoshi Kusama Osamu Inamura Masa-aki Yoshida Noritaka Hirohashi
author_sort	Noriyosi Sato
title	Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
title_short	Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
title_full	Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
title_fullStr	Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
title_full_unstemmed	Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
title_sort	rare polyandry and common monogamy in the firefly squid, watasenia scintillans
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/00596c49627e4ddea1da5f4621d9d03c
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Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans

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