Reproductive cycle of the venerid clam Meretrix lusoria in Ariake Sound and Tokyo Bay, Japan
Reproductive cycle of the venerid clam Meretrix lusoria in Ariake Sound and Tokyo Bay, Japan
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DOI：
10.1007/s12562-010-0289-4
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发表时间：
2010-11-01
影响因子：
1.9
通讯作者：
Tamaki, Akio
中科院分区：
文献类型：
--
作者：
Nakamura, Yasuo;Nakano, Tadashi;Tamaki, Akio
通过对文蛤生殖腺的组织学分析，对文蛤的生殖周期进行了研究。从白川潮滩、有明海峡的自然种群和从白川潮滩移植到东京湾大井潮滩的种群中采集了研究个体。在这两个研究领域，两性之间的生殖周期是同步的。文蛤的性腺在早春开始发育，在夏季成熟。大规模产卵发生在夏末/初秋。蛤蜊成熟时壳长为17-20毫米，比之前认为的要小得多。虽然两个研究区域的营养条件和盐度差异很大，但水温显示出相似的季节变化（冬季为12摄氏度，夏季为30摄氏度左右）。因此，温度可能控制性腺发育。在东京湾的潮滩缺氧沃茨频繁入侵的产卵期的巧合表明，这种缺氧事件干扰蛤招聘，并至少部分负责在这个位置的自然人口的消失。
We assessed the reproductive cycle of the venerid clam Meretrix lusoria by histological analysis of the gonads. Individuals for study were collected from natural populations on the Shirakawa tidal flat, Ariake Sound, and from populations that had been transplanted from the Shirakawa flat to the Oi flat in Tokyo Bay. In both study areas, the reproductive cycle was synchronized between sexes. Gonads of the clam started to develop in early spring and matured during the summer. Mass spawning occurred in the late summer/early fall. The clam matured at a shell length of 17-20 mm, which is much smaller than previously considered. While trophic conditions and salinity differed considerably in the two study areas, water temperatures showed similar seasonal changes (12 degrees C during the winter and around 30 degrees C during the summer). Thus, temperature probably controlled gonadal development. The coincidence of the period of spawning with the period of frequent intrusion of hypoxic waters into the tidal flats in Tokyo Bay suggests that such hypoxic events interfere with clam recruitment and are at least partly responsible for the disappearance of the natural population at this location.