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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >Sexual reproduction in three hermaphroditic deep-sea Caryophyllia species (Anthozoa : Scleractinia) from the NE Atlantic Ocean
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Sexual reproduction in three hermaphroditic deep-sea Caryophyllia species (Anthozoa : Scleractinia) from the NE Atlantic Ocean

机译：来自东北大西洋的三种雌雄同体深海石竹科植物的有性繁殖（Anthozoa：Scleractinia）

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摘要

The reproductive biology and gametogenesis of three species of Caryophyllia were examined using histological techniques. Caryophyllia ambrosia, Alcock 1898, C. cornuformis, Pourtales 1868, and C. sequenzae, Duncan 1873, were collected from the Porcupine Seabight and Rockall Trough in the NE Atlantic Ocean. These three ahermatypic solitary corals inhabit different depth ranges: C. cornuformis-435-2000 m, C. sequenzae-960-1900 m, and C. ambrosia-1100-3000m. All three species are hermaphroditic. Hermaphroditism in these species was found to be cyclical, with only one sex of gametes viable in any individual at any point in time, although gametes of both sexes were found together within a single mesentery. Once the viable gametes are spawned, the next sex of gametes continues to grow until mature, and so gametogenesis is a continuous cycle. Oocytes and spermacysts in all species increased in density towards the actinopharynx. Maximum fecundity for C. sequenzae was 940 oocytes per polyp, and for C. ambrosia 2900 oocytes per polyp. Fecundity could not be established for C. cornuformis. In all three species, individuals were asynchronous within populations, and production of gametes was quasi-continuous throughout the year. All species are hypothesised to have lecithotrophic larvae owing to their large oocyte sizes (C. cornuformis max-350 mu m; C. sequenzae max-430 mu m; C. ambrosia max-700 mu m). Both the average oocyte size and fecundity increased in species going down the depth gradient of the NE Atlantic.
机译：使用组织学技术检查了三种石竹的生殖生物学和配子发生。从东北大西洋的豪猪海带和洛克洛海槽收集了石竹藻（Alcock 1898），角形衣梭菌（C.cornuformis），普尔塔（Pourtales）和1873年邓肯氏菌（C. sequenzae）。这三种单峰珊瑚生活在不同的深度范围内：角形梭菌435-2000 m，s。sequenzae-960-1900 m和ambrosia-1100-3000m。这三个物种都是雌雄同体的。发现这些物种中的雌雄同体是周期性的，在任何时间点任何人都只能存活一种性别的配子，尽管在单个肠系膜中发现了两种性别的配子。一旦产生了可行的配子，配子的下一个性别将继续生长直至成熟，因此配子发生是一个连续的周期。所有物种的卵母细胞和精囊的密度朝着光化咽部增加。序列梭状芽胞杆菌的最大繁殖力为每个息肉940个卵母细胞，而氨纶梭菌的最大繁殖力为每个息肉2900个卵母细胞。无法确定角膜梭菌的生殖力。在这三个物种中，个体在种群中是不同步的，并且配子的生产在一年中几乎是连续的。由于所有物种的卵母细胞尺寸较大（C.cornuformis最大值为350μm; S。sequenzae最大值为430μm; C。ambrosia最大值为700μm），因此假设所有物种均具有绒毛营养幼虫。沿东北大西洋的深度梯度下降的物种的平均卵母细胞大小和繁殖力都增加了。

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