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Occurrence of abnormal sexual dimorphic structures in the gonochoristic crustacean, Upogebia major (Thalassinidea: Decapoda), inhabiting mud tidal flats in Japan

Published online by Cambridge University Press:  02 November 2010

Takahiro Nanri
Affiliation:
Department of Biology, Faculty of Science, Okayama University, Tsushima 3-1-1, Okayama-Kitaku 700-8530, Japan
Mayuko Fukushige
Affiliation:
Department of Biology, Faculty of Science, Okayama University, Tsushima 3-1-1, Okayama-Kitaku 700-8530, Japan
Jonathan P. Ubaldo
Affiliation:
Department of Biology, Faculty of Science, Okayama University, Tsushima 3-1-1, Okayama-Kitaku 700-8530, Japan
Bong-Jung Kang
Affiliation:
Japan International Research Center for Agricultural Sciences, Owashi 1-1, Tsukuba, Ibaraki 305-8686, Japan
Nobufumi Masunari
Affiliation:
Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Fisheries Science, Ushimado 8841-6, Setouchi-shi 701-4303, Japan
Yoshitake Takada
Affiliation:
Japan Sea National Fisheries Research Institute, Suido-cho 1-5939-22, Niigata 951-8121, Japan
Masatsugu Hatakeyama
Affiliation:
Invertebrate Gene Function Research Unit, National Institute of Agrobiological Sciences, Owashi 1-2, Tsukuba, Ibaraki 305-8634, Japan
Masayuki Saigusa*
Affiliation:
Natural Environment and Biodiversity Research–Education Supporting Agency, and Environmental Sciences for Wild Life, Faculty of Science, Okayama University, Tsushima-Naka 3-1-1, Okayama-Kitaku 700-8530, Japan
*
Correspondence should be addressed to: M. Saigusa, Natural Environment and Biodiversity Research–Education Supporting Agency and Environmental Sciences for Wild Life, Faculty of Science, Okayama University, Tsushima-Naka 3-1-1, Okayama-Kitaku 700-8530, Japan email: [email protected]

Abstract

Normal females of the mud shrimp, Upogebia major, have a pair of pleopods on the first abdominal segment, while normal males do not. We have investigated nine populations in the Seto-Inland Sea, Japan, and found morphological disorders on the first abdominal segments of both males and females. In males, the first pleopods occurred. Morphology and arrangement of these additional pleopods were classified into four types. The pleopods of Types M-1 and M-2 were similar in structure to those of normal females. These males could be considered as de-masculinized individuals, and the occurrence of males with these morphological disorders showed local variation: while their frequency was high in two specific sites in Kasaoka Inlet (11.5% in Site 6 and 5.5% in Site 7), it was less than 3.5% in other sites. Other types had abnormal additional appendages similar to the walking legs (pereiopods) (Type M-3) or biramous leaf-like pleopods (Type M-4), but their frequency was extremely low (only 3 out of 1558 males inspected). Morphological disorders in males (Types M-1 and M-2) occurred independently of gonadal development, and did not affect the sexual characteristics as revealed by analyses of allometric growth and gonadal index. In females, morphological disorders were classified into five types: incomplete first pleopods (Type F-1); lack of the first pleopods (Type F-2 and F-3); transformation into the pereiopod-like pleopods (Type F-4); and biramous leaf-like pleopods (Type F-5). The frequency of Types 1–3 was especially high in Site 6 in Kasaoka Inlet (24.4%), but was less than 9.4% in other sites. A feature was that cuticular lesions often co-occurred with the morphological disorders. Possible causal factors of these abnormalities are discussed.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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