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Sperm displacement behavior of the cuttlefish Sepia esculenta (Cephalopoda: Sepiidae)


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Title: Sperm displacement behavior of the cuttlefish Sepia esculenta (Cephalopoda: Sepiidae)
Authors: Wada, Toshifumi / Takegaki, Takeshi / Mori, Tohru / Natsukari, Yutaka
Issue Date: Aug-2005
Publisher: Springer Verlag
Citation: Journal of Ethology, 23(2), pp.85-92; 2005
Abstract: Sperm displacement behavior of cuttlefish (Sepia esculenta) was observed in a tank. Before ejaculation, male cuttlefish used their arms III to scrape out sperm masses attached to the buccal membranes of females. The removed sperm mass debris was directly visible and countable. Active sperm were present within the removed sperm debris, implying that the aim of this behavior is to remove competing male sperm. However, many sperm masses remained on the female buccal membrane even after the removal behavior, showing that sperm removal in S. esculenta is incomplete. The duration of sperm removal (an indicator of male investment in that process) was unaffected by the body sizes of mated pair, the duration of spermatangia placement at the current mating (for the hypothesis that the sperm removal serves to creat attachment space of spermatophores), or the estimated amount of sperm masses deposited from previous matings. Moreover, male S. esculenta performed sperm removal regardless of whether the last male to mate with the partner was himself, suggesting males remove not only the sperm of rivals but also their own. Although the number of removed sperm masses increased with the time spent on removal of sperm, male cuttlefish may shorten the duration of sperm removal to avoid the risk of mating interruption. We conclude that this time restriction would likely influence the degree of partial sperm removal in S. esculenta. A digital video image relating to the article is available at http://www.momo-p.com/showdetail-e.php?movieid=momo040729se01a.
Keywords: Cuttlefish / Sepia esculenta / Sperm competition / Sperm displacement / Sperm removal duration
URI: http://hdl.handle.net/10069/27390
ISSN: 02890771
DOI: 10.1007/s10164-005-0146-6
Rights: © Japan Ethological Society and Springer-Verlag 2005 / The final publication is available at www.springerlink.com
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/27390

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