The vertical distribution and abundance of copepod nauplii and other micro- and mesozooplankton in the seasonal ice zone of Lützow-Holm Bay during austral summer 2009
The vertical distribution and abundance of copepod nauplii and other micro- and mesozooplankton in the seasonal ice zone of Lützow-Holm Bay during austral summer 2009
复制标题
L季节冰区桡足类无节幼体及其他中小型浮游动物的垂直分布和丰度
DOI：
10.1007/s00300-016-1925-y
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发表时间：
2016
期刊：
影响因子：
1.7
通讯作者：
Odate T & Fukuchi M
中科院分区：
文献类型：
--
作者：
Takahashi KT;Ojima M;Tanimura A;Odate T & Fukuchi M
南极季节性冰区（SIZ）是南大洋的一个重要生态区域。然而，在这个带的微型和中型浮游动物的丰度和垂直分布，特别是较小的桡足类无节幼体的贡献，知之甚少。2009年1月，我们调查了东南极Lützow-Holm湾SIZ微型和中型浮游动物的垂直分布、丰度和物种组成。浮游动物样本是用一个60-µm网眼的封闭网（适用于估计桡足类无节幼体的数量丰度）从三个深度层（0-100，100-200，200-500米）垂直拖曳收集的。小型哲水蚤桡足类，Oithonidae和Oncaeidae在该地区的浮游动物群落中占主导地位。聚类分析显示，这些群落按深度分为上层（0-200米）和中层（>200米）两类。在0- 100-m层的分布格局发生变化的海冰边缘，但没有表现出明显的关系，锋结构。桡足类的无节幼体包括Oithonaspp.，Oncaeaspp.，和哲水蚤是浮游动物总丰度的主要贡献者。表层无节幼体的丰度在开阔水域和边缘冰区较高，而在叶绿素含量较高的浮冰区较低。与海冰相关的低水温，而不是食物供应，可能导致了低桡足类无节幼体丰度观察到的表层内的浮冰区。这些发现提供了宝贵的背景资料，以监测浮游动物群落结构的变化，以应对不断变化的环境条件。
The Antarctic seasonal ice zone (SIZ) is an ecologically important region of the Southern Ocean. However, the abundance and vertical distribution of micro- and mesozooplankton in this zone, in particular the contribution of nauplii of smaller copepod taxa, are poorly understood. We investigated the vertical distribution, abundance, and species composition of micro- and mesozooplankton in the SIZ of Lützow-Holm Bay, East Antarctica, in January 2009. Zooplankton samples were collected using a 60-µm mesh closing net (appropriate to estimate the quantitative abundance of copepod nauplii) vertically hauled from three depth layers (0–100, 100–200, 200–500 m). Small calanoid copepods, Oithonidae, and Oncaeidae were dominant among the zooplankton communities in this region. Cluster analysis revealed that the communities were separated by depth into epipelagic (0–200 m) and mesopelagic (>200 m) groups. Distribution patterns in the 0- to 100-m layer changed at the sea ice edge, but showed no clear relationship with frontal structures. Nauplii of copepods includingOithonaspp.,Oncaeaspp., and Calanoida were major contributors to total zooplankton abundance. The abundance of these nauplii in the surface layer was high in open water and the marginal ice zone but low in the pack ice zone where chlorophyllaconcentrations were high. Low water temperature associated with sea ice, rather than food availability, may have caused the low copepod nauplii abundance observed in the surface layer within the pack ice zone. These findings provide valuable background information to monitor variations in zooplankton community structure in response to changing environmental conditions.