Seasonality of sexual reproduction in three photosymbiotic Trididemnum species (Didemnidae: Ascidiacea: Tunicata) in a subtropical sea grass bed

Euichi  Hirose; Aoi  Kojima; Jun  Nogami; Katsuya  Teruya

doi:10.1017/S0025315407057219

Abstract

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The seasonality of sexual reproduction was studied in three photosymbiotic Trididemnum species, T. miniatum, T. clinides and T. nubilum, inhabiting the same site. In all species, the colonies lacked gonads and/or embryos during the cold season, while gonads were found in most colonies for several months in the warm season. There were some interspecific differences in the duration of the breeding season. Although water temperature is thought to be the principal factor confining sexual reproduction in these photosymbiotic ascidians, other factors, e.g. precipitation, potentially affect fecundity.

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Hirose, Euichi Oka, Atsushi T. and Hirose, Mamiko 2009. Two New Species of Photosymbiotic Ascidians of the GenusDiplosomafrom the Ryukyu Archipelago, with Partial Sequences of the COI Gene. Zoological Science, Vol. 26, Issue. 5, p. 362.

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Kojima, Aoi and Hirose, Euichi 2012. Transmission of Cyanobacterial Symbionts During Embryogenesis in the Coral Reef Ascidians Trididemnum nubilum and T. clinides (Didemnidae, Ascidiacea, Chordata). The Biological Bulletin, Vol. 222, Issue. 1, p. 63.

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Seasonality of sexual reproduction in three photosymbiotic Trididemnum species (Didemnidae: Ascidiacea: Tunicata) in a subtropical sea grass bed

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