Seasonal Traits of Reproduction in a Gnathiid Isopod Elaphognathia cornigera (Nunomura, 1992)(Ecology)

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概要

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• Field studies on the reproductive traits of a population of a gnathiid isopod Elaphognathia cornigera (Nunomura) were conducted at a rocky intertidal shore on the Izu Peninsula, southern Japan. Fortnightly surveys for two years showed some peculiar seasonal trends in the female reproductive characteristics. While adult males and juveniles of the species occurred throughout the year, semelparous adult females occurred only from spring to autumn. Based on the occurrence patterns of the females in six different reproductive stages, there seemed to be four generations in 1994 and three in 1995. Though the reproductive investment of a female showed no significant variation through each year, there were marked seasonal variations in the female broods. Female body size and brood size became the largest in early summer, but egg size reached its maximum in autumn. Maximum food availability (high density of gobies) in spring and the unfavorable environmental conditions in winter were thought to be the major controlling factors of the size and number of female broods.

• 社団法人日本動物学会の論文
• 2000-05-20

著者

• Tanaka Katsuhiko

  Shimoda Marine Research Center, University of Tsukuba

• Aoki Masakazu

  Shimoda Marine Research Center University Of Tsukuba

• Tanaka Katsuhiko

  Shimoda Marine Research Center University Of Tsukuba

関連論文

• Ecological studies on the community of drifting seaweeds in the south-eastern coastal waters of Izu Peninsula, central Japan, I : Seasonal changes of plants in species composition, appearance, number of species and size
• Ecological studies on the community of drifting seaweeds in the south-eastern coastal waters of Izu Peninsula, central Japan. II : Seasonal changes in plants showing maximum stipe length in drifting seaweed communities
• Regional variation in shell utilization patterns of the hermit crab Pagurus filholi
• Spatial distribution patterns of the sponge-dwelling gnathiid isopod Elaphognathia cornigera (Nunomura) on an intertidal rocky shore of the Izu Peninsula, southern Japan
• Fine Structures of Tunic Cells and Distribution of Bacteria in the Tunic of the Luminescent Ascidian Clavelina miniata : Ascidiacea, Urochordata
• Transplantation of Gorgonian Octocorals for in situ Experimental Manipulations
• Variation in gametophyte dominance in populations of Chondrus verrucosus (Gigartinaceae, Rhodophyta)
• Seasonal Traits of Reproduction in a Gnathiid Isopod Elaphognathia cornigera (Nunomura, 1992)(Ecology)

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