Vertical distribution, population structure and developmental characteristics of the less studied but globally distributed mesopelagic copepod Scaphocalanus magnus in the western Arctic Ocean
Vertical distribution, population structure and developmental characteristics of the less studied but globally distributed mesopelagic copepod Scaphocalanus magnus in the western Arctic Ocean
复制标题
北冰洋西部研究较少但全球分布的中层桡足类Scaphocalanus magnus的垂直分布、种群结构和发育特征
DOI：
10.1093/plankt/fbaa021
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发表时间：
2020
影响因子：
2.1
通讯作者：
Abe Yoshiyuki
中科院分区：
文献类型：
--
作者：
Yamaguchi Atsushi;Ashjian Carin J;Campbell Robert G;Abe Yoshiyuki
大舟哲水蚤（Scaphocalanus magnus）是一种大型桡足类动物，分布于世界各地。关于这个物种的生态信息是稀缺的。在本研究中，S.在北冰洋西部的一个冰站，用垂直分层网取样法收集了一年多的magnus。极夜和午夜太阳的垂直分布不同，极夜的核心深度分布为264-381米，午夜太阳的核心深度分布为518-745米。极夜期间较浅的分布可能是由于动物在生产力较低的季节向上移动以寻找足够的食物。早期桡足类阶段的丰度表现出明显的季节性。C2和C3阶段分别在6 - 8月和8 - 9月丰富。在C4之后，丰度的季节性不清楚。对于C4和C5，雄性的体型和质量大于雌性，而C6的情况相反。成年雄性不进食，因此寿命比雌性短，使成年雄性的性别比例偏向雌性。对于这些中层颗粒喂养桡足类，在C6 F的长停留时间表明，在不同的食物环境中，有可能等到有利的食物条件发生才开始繁殖。
Scaphocalanus magnusis a large copepod species with a worldwide distribution. Information on the ecology of this species is scarce. In this study,S. magnuswas collected using vertically stratified net sampling from an ice station in the western Arctic Ocean over a year. The vertical distribution differed between periods of polar night and midnight sun, with core depth distributions of 264–381 m for the polar night and 518–745 m for the midnight sun. The shallower distribution during the polar night may have resulted from the animals moving upwards to find sufficient food during the less productive season. The abundance of early copepodite stages showed clear seasonality. The C2 and C3 stages were abundant June–August and August–September, respectively. After C4, seasonality in abundance was not clear. For C4 and C5, body sizes and masses were greater for males than for females while the opposite was the case for C6. Adult males do not feed and thus have shorter life spans than females, skewing the adult sex ratio towards females. For these mesopelagic particle feeding copepods, a long residence time at C6F suggests that in a varying food environment, it is possible to wait to initiate reproduction until favourable food conditions occur.