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首页> 外文期刊>Marine biology >Reproduction in the externally brooding sea anemone Epiactis georgiana in the Antarctic Peninsula and the Weddell Sea
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Reproduction in the externally brooding sea anemone Epiactis georgiana in the Antarctic Peninsula and the Weddell Sea

机译：在南极半岛和韦德尔海外部繁殖的海葵乔治亚大红海葵繁殖

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摘要

External parental care is uncommon among actiniarians but common in Epiactis species. Here, several aspects of reproduction are analyzed for of one of them, Epiactis georgiana. Samples were collected in December, January, February, March, and April in the Antarctic Peninsula and the eastern Weddell Sea, during 1998, 2000, 2002, and 2003. Most sexually mature individuals of E. georgiana are male or female, but some are hermaphrodites. This is the first report of hermaphroditism in E. georgiana, which is the third species of the genus with this sexual pattern. The results suggest that oogenesis starts in December and that at least two generations of oocytes overlap; a third generation is often brooded externally. Putative fertilization is likely internal, and larvae and/or embryos are externally brooded on the distal part of the adult column until an advanced developmental stage. Apparently E. georgiana reproduces seasonally, probably releasing the embryos/larvae in the last months of the austral spring (December). Inter-individual variability was observed in gametogenesis. In addition, specimens from the Antarctic Peninsula were larger than those from the Weddell Sea. This study represents the first step in understanding the reproductive mode of E. georgiana.
机译：外部的父母照料在放牧者中并不常见，但在Epiactis物种中很普遍。在这里，对繁殖的几个方面进行了分析，其中之一是乔治亚州Epiactis。 1998年，2000年，2002年和2003年分别在南极半岛和韦德海东部采集了12月，1月，2月，3月和4月的样品。乔治亚州大肠杆菌的大多数性成熟个体是男性或女性，但有些是雌雄同体。这是佐治亚州大肠杆菌中的雌雄同体的首次报道，这是具有该性模式的属的第三种。结果表明卵子发生在12月开始，并且至少两代卵母细胞重叠。第三代通常在外部繁殖。推定的受精很可能是内部的，幼虫和/或胚胎从外部繁殖在成年柱的远端，直到发育后期。显然，佐治亚州大肠杆菌（E. Georgiana）季节性繁殖，可能在南方春季（12月）的最后几个月释放出胚胎/幼虫。在配子发生中观察到个体间差异。此外，南极半岛的标本比韦德尔海的标本更大。这项研究代表了了解格鲁吉亚大肠杆菌生殖方式的第一步。

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  • 来源
    《Marine biology》 |2013年第1期|67-80|共14页
  • 作者

    E. Rodriguez; C. Orejas; P. J. Lopez-Gonzalez; J. M. Gili;

  • 作者单位

    Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA;

    Instituto Espanol de Oceanografia, Centro Oceanografico de Baleares, Muelle de Poniente, s, 07015 Palma de Mallorca, Spain;

    Biodiversidad y Ecologia de Invertebrados Marinos, Departmento de Fisiologia y Zoologia, Facultad de Biologia, Universidad de Sevilla, Reina Mercedes 6, 41012 Sevilla, Spain;

    Department of Biologia Marina y Oceanograffa, Institut de Ciencies del Mar (CSIC), Passeig Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

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