2007
DOI: 10.3354/meps06971
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Threshold dimorphism in ejaculate characteristics in the squid Loligo bleekeri

Abstract: Male dimorphism has been thought to correlate with alternative reproductive behaviors. Alternative reproductive behaviors promote asymmetry in sperm competition, and the differences in fertilization success could promote adaptations in ejaculate characteristics in relation to each reproductive behavior. Using allometric analysis, we show that ejaculate dimorphism clearly exists in males of the squid Loligo bleekeri, a cephalopod species with body size-related alternative mating behaviors. A morphological switc… Show more

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Cited by 40 publications
(63 citation statements)
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“…The hectocotylized arm is not inserted into the seminal recepta-cle; therefore, antagonistic genital coevolution would not occur between the hectocotylized arm and the seminal receptacle. However, the seminal receptacle may be affected strongly by post-copulatory sexual selection because cephalopods have a promiscuous mating system, which has led to many studies of sperm competition in cuttlefish (Hanlon et al, 1999;Hall & Hanlon, 2002;Naud et al, 2004Naud et al, , 2005Wada et al, 2005;Naud & Havenhand, 2006) and loliginid squids (Shaw & Boyle, 1997;Hanlon, Smale & Sauer, 2002;Shaw & Sauer, 2004;Iwata, Munehara & Sakurai, 2005;Iwata & Sakurai, 2007). In particular, the number and location of seminal receptacles varies among species.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…The hectocotylized arm is not inserted into the seminal recepta-cle; therefore, antagonistic genital coevolution would not occur between the hectocotylized arm and the seminal receptacle. However, the seminal receptacle may be affected strongly by post-copulatory sexual selection because cephalopods have a promiscuous mating system, which has led to many studies of sperm competition in cuttlefish (Hanlon et al, 1999;Hall & Hanlon, 2002;Naud et al, 2004Naud et al, , 2005Wada et al, 2005;Naud & Havenhand, 2006) and loliginid squids (Shaw & Boyle, 1997;Hanlon, Smale & Sauer, 2002;Shaw & Sauer, 2004;Iwata, Munehara & Sakurai, 2005;Iwata & Sakurai, 2007). In particular, the number and location of seminal receptacles varies among species.…”
Section: Discussionmentioning
confidence: 99%
“…The spermatangium, sometimes referred to as the sperm reservoir or sperm mass, is released from the spermatophore by a spermatophoric reaction (e.g. Drew, 1919; Austin, Lutwak‐Mann & Mann, 1964; Takahama et al , 1991) and attaches to the female body (Drew, 1919; Iwata & Sakurai, 2007). In most squids, the female stores sperm in her seminal receptacle, a sperm storage organ, but how does sperm end up inside the seminal receptacle is unknown.…”
Section: Introductionmentioning
confidence: 99%
“…Many studies have suggested that most cephalopods utilize polyandry, which is where a female mates with multiple males during the spawning season (Hanlon and Messenger, 1996;Hanlon et al, 2005). Previous studies have shown that females not only mate with large size males in a group (the consorts) but also mate with other smaller males (the sneakers) using distinct types of courtship behavior (Hanlon et al, , 2002(Hanlon et al, , 2005Jantzen and Havenhand, 2003b;Naud et al, 2004Naud et al, , 2016Iwata et al, 2005;Wada et al, 2005;Iwata and Sakurai, 2007;Huffard et al, 2008;Sato et al, 2014). These results suggest that males of different sizes may adopt different strategies in order to gain access to females and that females may during the same process choose different males in order to maximize their reproduction success.…”
Section: Introductionmentioning
confidence: 99%
“…We therefore carried out further investigations with other Loliginidae species that also employ alternative male mating behavior. In Loligo reynaudii and Photololigo edulis , sperm from sneaker individuals, as judged from the sperm mass morphology (Iwata and Sakurai 2007 ), exhibited self-swarming, whereas no swarming occurred for sperm from consort individuals. Moreover, in species employing only sneaker-type mating behavior, that is, males inseminate the external sites on females, such as Idiosepius paradoxus and Todarodes pacifi cus , sperm also showed swarming behavior, supporting our hypothesis that the swarming trait tightly associates with the fertilization mode rather than sperm competition between sneaker and consort (Parker 1990 ).…”
Section: Discussionmentioning
confidence: 98%