Sexual Competition Among Male Blue Crab, <i>Callinectes sapidus</i>

Jivoff, Paul R.

doi:10.2307/1542939

Cited by 78 publications

(59 citation statements)

References 65 publications

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“…Similar size verified in U. cordatus males' and females' morphologic maturity was certainly related to its semiterrestrial behaviour features with up to a five-hour-mating, which occurred with both partners during intermoult (Hartnoll, 1969). On the other hand, male aquatic Brachyura at maturity was bigger than the female, which favored the formation of couples with males having advantage on females at mating time in post-moult (Jivoff, 1997). In this case, bigger males could provide a female with further protection, as pointed out for Arenaeus cribrarius by Fransozo (1998, 1999).…”

Section: Discussionsupporting

confidence: 59%

Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

Dalabona

Silva

Pinheiro

2005

Braz. arch. biol. technol.

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Section: Discussionsupporting

confidence: 59%

Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

Dalabona

Silva

Pinheiro

2005

Braz. arch. biol. technol.

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“…Smaller males passed only a small number of sperm to females in the second and the third matings. It has been observed that larger males always provide larger ejaculates to females even after successive matings than do smaller males also in spiny king crab ) and blue crab (Jivoff 1997). …”

Section: -4a Number Of Ejaculated Spermmentioning

confidence: 99%

“…Sperm probability is closely related to population demographic structure because male ability to provide sperm to females is influenced by their body size and mating frequency. For example, smaller males often hold less sperm than larger ones (Pitnick 1996;Jivoff 1997;Kendall et al 2001), and thus sperm availability can be less in populations with only small males. When the sex ratio in a population is skewed toward females, male mating frequency increases.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Large Male-Selective Harvesting on Reproduction: Illustration with Large Decapod Crustacean Resources

Sato¹

2012

Aqua-BioSci. Monogr. (ABSM)

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Keywordsbeen reported in many species of vertebrates and invertebrates (e.g. Bianchi et al. 2000;Branch and Odendaal 2003;Roy et al. 2003;Harvey et al. 2006).In a wide range of taxa, body size is one of the key determinants of fitness in both males and females (Andersson 1994). For example, body size is positively correlated with reproductive fitness (e.g. mating success and fecundity). Mostly, larger males are stronger competitors for females (e.g. Hoefler 2007) or can provide more ejaculated sperm (e.g. Jivoff 1997), or better care for the offspring (e.g. Kolm 2002). In females, body size positively correlates with egg size (e.g. Einum and Fleming 1999), number of spawning (e.g. Claramunt et al. 2007), number of eggs spawned (e.g. Evans et al. 2008), or quality of larvae (e.g. Berkeley et al. 2004). Therefore, mate choice is non-random in the majority of animal species (Real 1990), and males and females prefer larger mates mutually (e.g. Sandvik et al. 2000;Herdman et al. 2004; Aquiloni and Gherardi AbstractTo signal a need for caution for present large male-selective harvesting practices, negative impacts of the large male-selective harvesting on reproductive output in large decapod crustacean resources are introduced with emphasis on my own work with spiny king crab Paralithodes brevipes, coconut crab Birgus latro, and the stone crab Hapalogaster dentata. The large male-selective harvestings for several large decapod crustaceans have changed their population demographic structure by decreasing mean male size and skewing sex ratio towards females. By several field and laboratory experiments, the change of population demographic structure was anticipated to decrease female reproductive success in the resources (i.e. reproductive output of the harvested populations) through a decrease in sperm availability for females because of male size-dependent reproductive potentials and slow sperm recovery rate. Furthermore, reproductive output and stability of the large male-selective harvested resources were also anticipated to decline by a decrease in mate availability for females, attributing to combination of female mate choice for larger males with negative effects of female delayed mating and/or maternal influences. To establish the optimal management practices, the details of the mating system and reproductive ecology of each targeted species should be investigated.

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“…. Larger males have larger sperm reserves (Pitnick 1996, Kendall et al 2001, Sato et al 2005) and pass larger ejaculates to successive mates than do smaller ones in some species (Jivoff 1997, and thus sperm supply can be lower in populations with only small males. Therefore, the probability that females suffer from insufficient sperm supply is closely related to the structure of the population, namely the mean male size and the sex ratio.…”

Section: Introductionmentioning

confidence: 99%

Sperm limitation: possible impacts of large male-selective harvesting on reproduction of the coconut crab Birgus latro

Sato

Yoseda²,

Okuzawa³

et al. 2010

Aquat. Biol.

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Sexual Competition Among Male Blue Crab, Callinectes sapidus

Cited by 78 publications

References 65 publications

Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

Impacts of Large Male-Selective Harvesting on Reproduction: Illustration with Large Decapod Crustacean Resources

Sperm limitation: possible impacts of large male-selective harvesting on reproduction of the coconut crab Birgus latro

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