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首页> 外文期刊>Marine biology >Reproductive strategies of two deep-sea gastropod species from the Porcupine Seabight (Northeast Atlantic)
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Reproductive strategies of two deep-sea gastropod species from the Porcupine Seabight (Northeast Atlantic)

机译：豪猪海域（东北大西洋）的两种深海腹足动物物种的繁殖策略

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摘要

Two species of small gastropods (<6 mm in length), Amphissa acutecostata (Philippi, 1844) and Gymnobela subaraneosa (Dautzenberg and Fischer, 1896), widely distributed in the northeast Atlantic, were found in large numbers in the Porcupine Seabight (Northeast Atlantic). Except for some aspects of taxonomy and distribution, as well as some data on larval development, the biology of these species is unknown. This study describes basic aspects of the life-history strategies of both species. Histological studies showed that oocyte and sperm development in both species was similar to the gametogenetic patterns observed in other deep-sea gastropods. In females, oogonia proliferated in the germinal epithelium and developed into previtellogenic oocytes (30-40 μm), which grew into vitellogenic primary oocytes. Vitellogenic oocytes were covered by a thin layer of follicle cells involved in the vitellogenic processes. The maximum size for mature oocytes was 99.06 μm for A. acutecostata and 114.82 μm for G. subaraneosa. In A. acutecostata most of the volume of the ovary was occupied by previtellogenic and early vitellogenic oocytes, whereas in G. subaraneosa most of the volume was filled by large vitellogenic oocytes. Both species showed quasi-continuous production of oocytes. The oocyte size-frequency diagrams suggested a continuous release of a small number of oocytes throughout the year for A. acutecostata, and asynchronous periodic spawning events for G. subaraneosa. Gonad development and gametogenesis could be strongly affected by presence of parasites in one of the populations of G. subaraneosa.
机译：在豪猪海域（东北大西洋）大量发现了两种小型腹足动物（长度<6毫米），即Amphissa急性肋ata（Philippi，1844年）和裸Gym（Gymnobela subaraneosa）（Dautzenberg and Fischer，1896年）。 ）。除了分类学和分布的某些方面以及有关幼体发育的某些数据外，这些物种的生物学性尚不清楚。这项研究描述了两种物种的生活史策略的基本方面。组织学研究表明，这两个物种的卵母细胞和精子发育与其他深海腹足动物的配子体发育模式相似。在雌性中，卵黄质在生发上皮中增殖，并发展为玻璃体形成前卵母细胞（30-40μm），然后生长为卵黄原代卵母细胞。卵母细胞形成的卵母细胞被卵母细胞形成过程中的卵泡细胞薄层覆盖。成熟的卵母细胞的最大大小对于A.急性肋ata为99.06μm，而对于G. subaraneosa则为114.82μm。在急性肋孢菌中，卵巢的大部分体积被玻璃化前卵母细胞和早期卵黄形成的卵母细胞占据，而在亚油茶中，大部分卵黄质被卵黄形成的卵母细胞充满。两种物种均显示卵母细胞准连续产生。卵母细胞大小-频率图表明，一年生急性肋孢菌持续释放少量卵母细胞，而亚蛛网菌则有异步周期性产卵事件。拟南芥种群之一中存在寄生虫，可能强烈影响性腺发育和配子发生。

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