On the Life History of Pandalus nipponensis YOKOYA

Tamura, T.M.

doi:10.2331/suisan.15.721

Cited by 5 publications

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“…Of 37 species of decapods known to have protandric sexual systems, 31 are caridean shrimps, 1 is an axiid thalassinid, 1 is a parastacid crayfish, 2 are hippid anomurans, and 2 are penaeoid shrimps [ Table 1 in Brook et al, 1994, plus the alpheid shrimp Athanas indicus (Coutiere, 1903) in Gherardi and Calloni (1993); the pandalid shrimps Panda/us gracilis Stimpson, 1860, in Hayashi (1988 and P. nipponensis Yokoya, 1933, in Tamura (1950; the parastacid crayfish Parastacus nicoleti (Philippi, 1882) in Rudolph (1995); and Melicertus kerathurus (Forskal, 1775) in Heegaard (1971)]. In several protandric caridean species, all individuals of the population mature first as males and then become females as they increase in size and age, e.g., Rathbun, 1902;Panda/us platyceros Brandt, 1851;Panda/us hypsinotus Brandt, 1851; Panda/us goniurus Stimpson, 1860 (Butler, 1964(Butler, , 1980 (Fig.…”

Section: Protandric Hermaphroditism In the Carideamentioning

confidence: 99%

Simultaneous Hermaphroditism in Caridean Shrimps: A Unique and Puzzling Sexual System in the Decapoda

Bauer¹

2000

Journal of Crustacean Biology

173

156

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The sexual system of the caridean genus Lysmata has been described until recently as protandric hermaphroditism, in which individuals change sex from male to female with increasing size. However, recent studies by Bauer andHolt (1998) andFiedler (1998) have shown that female-phase individuals of at least two species are outcrossing simultaneous hermaphrodites, a sexual system described here as protandric simultaneous hermaphroditism (PSH). There is considerable variation in the ontogeny of protandric carideans, revealing an underlying flexibility in sex determination and development which has made PSH possible in at least some Lysmata spp. Possible costs and benefits of retention of male reproductive function in female-phase hermaphrodites are proposed. The PSH appears to be unique (to date) within the Decapoda and other Malacostraca to the caridean genus Lysmata and perhaps the related genus Exhippolysmata. It is puzzling that PSH has evolved in a group with such considerable variation in socio-ecological attributes: some Lysmata species are warm temperate, highly aggregated, with unspecialized (facultative) fish-cleaning behavior while others are tropical species, occur at low density in hermaphrodite pairs associated with sea anemones, and are specialized fish cleaners. Description of sexual systems, costs/benefits of PSH, and socioecological attributes of Lysmata, considered in the context of a phylogeny of the group, will be necessary to understand how PSH evolved in Lysmata and why it has not evolved in other groups of protandric carideans.

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