Seasonal Cycle of Male Gonad Development of the Intertidal Sea Anemone &lt;I&gt;Actinia equina&lt;/I&gt; (Cnidaria : Anthozoa) in Sagami Bay, Japan

Yanagi, Kensuke; Segawa, Susumu; Okutani, Takashi

doi:10.5179/benthos1996.51.2_13

BENTHOS RESEARCH

1996

DOI: 10.5179/benthos1996.51.2_13

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Seasonal Cycle of Male Gonad Development of the Intertidal Sea Anemone <I>Actinia equina</I> (Cnidaria : Anthozoa) in Sagami Bay, Japan

Kensuke Yanagi¹,

Susumu Segawa²,

Takashi Okutani

Abstract: The annual cycle

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Cited by 4 publications

(1 citation statement)

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“…Because sexual reproduction of Anthopleura sp. has not been investigated in detail, it is possible that the young brooded in the coelenteron are derived from several processes, including sexual reproduction, as in A. equina (Chia & Rostron 1970;Yanagi et al 1996). The aims of this study were (1) to document any seasonality of brooding in Anthopleum s~.…”

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confidence: 98%

Internal brooding of clonal propagules by a sea anemone, Anthopleura sp.

Isomura

Hamada

Nishihira

2003

Invertebrate Biology

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We investigated the seasonal prevalence of reproductive activities and of the development of brooded propagules in an intertidal sea anemone, Anthopleura sp., on the rocky shore of Mutsu Bay, in northern Japan. A monthly examination of anemones, by dissection and histological techniques, revealed no sign of gonad development, but did reveal that they produce and internally brood propagules throughout the year. Release of propagules was observed in the field. This anemone population appears to be entirely asexual and agametic, and may persist solely through clonal propagation.

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mentioning

confidence: 98%

Internal brooding of clonal propagules by a sea anemone, Anthopleura sp.

Isomura

Hamada

Nishihira

2003

Invertebrate Biology

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Internal brooding affects the spatial structure of intertidal sea anemones in the Arctic-boreal region

et al. 2012

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Reproduction in the tropical frilly sea anemone Phymanthus pinnulatus (Cnidaria, Actiniaria)

Yong

Yap

Tan

et al. 2021

Invertebrate Biology

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Our understanding of how sea anemones reproduce in the equatorial Central Indo‐Pacific region remains poor compared to other marine regions. Here we report the gametogenic cycles of Phymanthus pinnulatus, a zooxanthellate sea anemone found throughout the Indo‐Pacific tropics. Observations were based on 41 individuals collected in Singapore. We found P. pinnulatus to be gonochoric, with an equal sex ratio of 1:1. Phases of oogenesis and spermatogenesis were detailed for the first time in P. pinnulatus, and were consistent with phases in other actiniarians. Females with pedal disc diameters <10 mm were found to asynchronously produce oocytes. We also found that trophonemata were associated with both oocytes and spermaries during gametogenesis. In Singapore, the periods during which gametes matured in each sex of P. pinnulatus appeared to overlap. We were unable distinguish whether spawning was annual or continuous in P. pinnulatus. Our observations on the occurrence of maturing and matured gametes in P. pinnulatus were similar to those reported for other species within the Central Indo‐Pacific. It also coincided with the multispecies spawning of scleractinian corals in Singapore. This study contributes to the growing body of work focused on the biology of tropical actiniarians in the Central Indo‐Pacific region.

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Seasonal Cycle of Male Gonad Development of the Intertidal Sea Anemone <I>Actinia equina</I> (Cnidaria : Anthozoa) in Sagami Bay, Japan

Abstract: The annual cycle

Cited by 4 publications

References 17 publications

Internal brooding of clonal propagules by a sea anemone, Anthopleura sp.

Internal brooding of clonal propagules by a sea anemone, Anthopleura sp.

Internal brooding affects the spatial structure of intertidal sea anemones in the Arctic-boreal region

Reproduction in the tropical frilly sea anemone Phymanthus pinnulatus (Cnidaria, Actiniaria)

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