Daytime surface swarms of the euphausiid Thysanoessa inermis off the west coast of Hokkaido, northern Japan
Daytime surface swarms of the euphausiid Thysanoessa inermis off the west coast of Hokkaido, northern Japan
复制标题
日本北部北海道西海岸白天的磷虾科无刺鼩鼩鱼群
DOI：
10.1007/bf00428489
复制
发表时间：
1989
期刊：
影响因子：
2.4
通讯作者：
S. Hamaoka
中科院分区：
文献类型：
--
作者：
Y. Hanamura;M. Kotori;S. Hamaoka
1982 ~ 1987年在日本海东北部的北海道西海岸调查了南极磷虾Thysanoessa inermis（Krøyer）的日间群集生物学特性。群完全由完全成熟的个人，男性拥有精囊在射精管和女性附着精囊在thelycum。女性占主导地位，在大多数群体，而男性或几乎平衡的群体很少遇到。完全成熟的雌性出现在蜂群季节后期，通常是4月中旬。胃的检查表明，在白天的表面群集行为的摄食活动低。群体的个体大小。在八木尻岛附近发现的化石比在积丹半岛附近同时发现的化石要大得多。这表明这两个地区的磷虾种群是不同的。
Biological characteristics of the daytime swarming of the euphausiidThysanoessa inermis(Krøyer) were examined off the west coast of Hokkaido in the northeast Sea of Japan between 1982 and 1987. Swarms were composed exclusively of fully mature individuals; males possessed spermatophores at the ejaculatory ducts and females had attached spermatophores at the thelycum. Females predominated in most swarms, while males or nearly balanced swarms were infrequently encountered. Fully mature females occurred in the late swarming season, usually mid-April. Examination of stomachs indicated that feeding activity was low during the daytime surface swarming behavior. The body sizes of swarmingT. inermisoccurring around Yagishiri Island were significantly larger than those found simultaneously off the Shakotan Peninsula. This suggests that the euphausiid populations of the two areas are different.