Reproductive swarming of sympatric nereidid polychaetes in an estuary of the Omuta-gawa River in Kyushu, Japan, with special reference to simultaneous swarming of two Hediste species
Reproductive swarming of sympatric nereidid polychaetes in an estuary of the Omuta-gawa River in Kyushu, Japan, with special reference to simultaneous swarming of two Hediste species
复制标题
DOI：
10.2108/zsj.23.205
复制
发表时间：
2006-02-01
影响因子：
0.9
通讯作者：
Tosuji, Hiroaki
中科院分区：
文献类型：
--
作者：
Hanafiah, Zazili;Sato, Masanori;Tosuji, Hiroaki
2003年12月至2005年1月，通过对日本九州大屋田川河口的定期采样，研究了同域沙蚕多毛目沙蚕生殖集群的生境差异和时空分离。河口上游主要分布着大泽泰勒喙虫和Hediste diadroma的底栖成虫，而河口上游主要分布着Hediste diadroma的底栖成虫。粳稻多分布于中游，但二者的分布有重叠。结果表明，4种沙蚕成虫在大潮期间的夜间高潮后繁殖群集现象均发生在河口：H。japonica（12月下旬至2月下旬）、H. diadroma（12月中旬至4月下旬，整个河口）、Tosawai（10月下旬至12月下旬，中游和另一河口）和Nectoneanthes oxypoda sensu Imajima，1972（4月下旬至5月上旬，下游）。这一结果表明，除了H. japonica和H.横裂同时群集和大量产卵的两个Hediste种通常观察到在中下游从12月下旬至2月初，这表明没有一个产卵前的障碍，生殖隔离之间。结果表明，在产卵行为上，两种线虫没有明显差异。japonica和H.横裂这两个物种的男性似乎参与群集早于女性。
Habitat differences and spatial and temporal separation in reproductive swarming among sympatric nereidid polychaetes were examined in an estuary of the Omuta-gawa River, Kyushu, Japan by annual periodical sampling from December 2003 to January 2005. Benthic adults of Tylorrhynchus osawai and Hediste diadroma occupied mainly the upper reaches of the estuary, whereas those of H. japonica usually inhabited the middle reaches, though their distributions overlapped. Reproductive swarming of mature adults occurred in the estuary just after high tide at night during spring tides in four nereidids: H. japonica (in the middle and lower reaches from late December to late February), H. diadroma (throughout the whole estuary from middle December to late April), T osawai (in the middle reaches and another estuary from late October to late December), and Nectoneanthes oxypoda sensu Imajima, 1972 (in the lower reaches in late April and early May). This result shows that temporal separation of reproductive swarming may act as a reproductive isolation mechanism among these nereidids, except for H. japonica and H. diadroma. Simultaneous swarming and mass-spawning of the two Hediste species were commonly observed in the middle and lower reaches from late December to early February, suggesting the absence of a pre-spawning barrier to reproductive isolation between them. We found no difference in spawning behavior between H. japonica and H. diadroma. Males of both species seemed to participate in swarming earlier than females.