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26 August 2020 Coexistence of Hermaphrodites and Males in Androgenetic Clam Corbicula fluminea Müller in Shirakawa River, Kyoto, Japan
Kan Tejima, Mitsuya Yamada, Shouji Houki, Akira Komaru
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Abstract

Sex, maturity, and the incidence of males in a population of hermaphroditic Corbicula fluminea Müller from Shirakawa River, Kyoto, Japan, are reported. Two shell color types (yellow and green) of this species are recognized. High frequencies of females (63.3% yellow and 58.5% green) are represented among individuals in this population. Histological examination of gonads and measurements of shell length suggest this species first matures as a female before commencing spermatogenesis (i.e., it is a protogynous simultaneous hermaphrodite). Low frequencies of males (mostly less than 5%), the testes of which are filled with spermatozoa, are reported; no histological evidence for any change from males to hermaphrodites, or hermaphrodites to males, is found. Requirements for maintaining males, and for their successful reproduction in self-compatible hermaphrodite populations, are proposed as follows: (1) the protogynous nature of the hermaphrodite, (2) low self-fertilization rates of hermaphrodites, (3) more spermatozoa and greater survival of males than hermaphrodites, and (4) high population densities, ensuring males and hermaphrodites are in close proximity.

Kan Tejima, Mitsuya Yamada, Shouji Houki, and Akira Komaru "Coexistence of Hermaphrodites and Males in Androgenetic Clam Corbicula fluminea Müller in Shirakawa River, Kyoto, Japan," Journal of Shellfish Research 39(2), 337-344, (26 August 2020). https://doi.org/10.2983/035.039.0215
Published: 26 August 2020
JOURNAL ARTICLE
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KEYWORDS
Androdioecy
Androgenesis
Corbicula fluminea
fertilization
hermaphrodite
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