Whole spermatangia within the seminal receptacles of female chokka squid (<i>Loligo reynaudii</i> d’Orbigny, 1839–1841)

Sato, Noriyosi; Iwata, Yoko; Shaw, Paul W.; Sauer, W. H. H.

doi:10.1093/mollus/eyy059

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Another hypothesis for the different extent of sperm dimorphism between L. reynaudii and H. bleekeri is the form of sperm storage in the seminal receptacle. Although females of most squid species store individual sperm in the seminal receptacle, 50% of females of L. reynaudii store intact spermatangia in their seminal receptacle (Sato et al., 2019). These results indicate that despite mating by sneaker males of L. reynaudii occurring before they join the mating aggregation, their sperm storage form would be similar to that occurring under EPC (i.e.…”

Section: Discussionmentioning

confidence: 99%

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Iwata

Sato

Hirohashi

et al. 2021

J of Evolutionary Biology

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In polygamous species, the mode of sperm storage in females influences evolution of sperm quantitative and qualitative traits because it provides the arena for sperm competition, cryptic female choice and fertilization processes. In this study, we compared ejaculate traits of two squid species, Heterololigo bleekeri and Loligo reynaudii. Both species show dimorphic sperm traits associated with alternative reproductive tactics where consort and sneaker males transfer sperm to different storage sites within a female (on the oviduct and near the mouth, respectively). Due to differences in reproductive behaviours and sperm placement, sperm competition risk is expected to be higher in sneakers than in consorts of both species and higher overall in L. reynaudii. Our results demonstrate that the instantaneous number of released sperm is adjusted to the expected sperm competition risk via an elaborate sperm package. Consort sperm are similar in size; however, sneaker sperm have a significantly longer flagellum in H. bleekeri than in L. reynaudii, most likely due to intra‐tactic conflicts associated with sperm storage conditions. From consideration of the different mating tactics, we suggest that while levels of sperm competition determine quantitative traits, sperm quality traits are determined more by the mode of sperm storage and fertilization.

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Section: Discussionmentioning

confidence: 99%

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Iwata

Sato

Hirohashi

et al. 2021

J of Evolutionary Biology

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Sex-specific role of the optic gland in octopus maya: A transcriptomic analysis

Ventura-López

López‐Galindo

Rosas

et al. 2022

General and Comparative Endocrinology

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A review of sperm storage methods and post-copulatory sexual selection in the Cephalopoda

Sato

2021

Biological Journal of the Linnean Society

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In many animal phyla, females have a unique sperm storage organ (SSO). Post-copulatory sexual selection is a powerful driving force of SSO evolution. SSOs are generally considered to have evolved through sexual antagonistic coevolution between male genitalia and the SSO and/or cryptic female choice (CFC). In cephalopods, sperm transfer and fertilization are conducted through complex processes, and sperm storage methods show inter-species variation. In some species, males implant spermatangia superficially under the female skin, and then sperm released from the spermatangia are transferred into a seminal receptacle (SR). Deep-sea cephalopods, which lack a SR, have instead evolved a deep-implanting method by which the spermatangium is embedded deep in the musculature of the mantle wall of the female. In some species, the female stores whole spermatangia within a spermatangium pocket. Because the males of most species do not insert an intromittent organ into the female when transferring sperm, SSO evolution may have been influenced by CFC alone. This review summarizes the sperm storage methods and the mechanisms of post-copulatory sexual selection in cephalopods and it is proposed that these diverse methods evolved as adaptive mechanisms through post-copulatory sexual selection.

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Whole spermatangia within the seminal receptacles of female chokka squid (Loligo reynaudii d’Orbigny, 1839–1841)

Abstract: Whole spermatangia within the seminal receptacles of female chokka squid (Loligo reynaudii Orbigny, 1845

Cited by 3 publications

References 30 publications

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Sex-specific role of the optic gland in octopus maya: A transcriptomic analysis

A review of sperm storage methods and post-copulatory sexual selection in the Cephalopoda

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