Copepod assemblages in the water column and drifting sea-ice floes in the ice-edge region in the Indian Ocean sector of the Southern Ocean during the austral summer
Copepod assemblages in the water column and drifting sea-ice floes in the ice-edge region in the Indian Ocean sector of the Southern Ocean during the austral summer
复制标题
南半球夏季南大洋印度洋区冰缘区域水柱中的桡足类群落和漂浮的海冰
DOI：
10.1007/s00300-022-03030-7
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发表时间：
2022
期刊：
影响因子：
1.7
通讯作者：
M. Moteki
中科院分区：
文献类型：
--
作者：
Makabe;R.;T. Hasegawa;M. Sano;H. Kashiwase;M. Moteki
与冰相关的桡足类Stephos longipes、Paralabidocera antarctica和Drescheriella glacialis是栖息在南极海冰中的优势物种。当边缘冰区（MIZ）的冰从春季到夏季融化时，它们被释放到水柱中，影响远洋生态系统，尽管人们对外海区域的情况知之甚少。我们于2014年仲夏（1月）和2016-2018年调查了南大洋印度区文森斯湾附近的漂流海冰和邻近水柱中桡足类动物的出现情况。在澳大利亚莫森站（2016年，n= 1）和达恩利角（2018年，n= 2）收集的冰生长季节（2月至3月）的海冰样本提供了与冰融化季节的一些比较。在南文森斯湾附近的浮冰中。 longipes和harpacticoid无节幼体数量丰富，但变化也很大（2016年：2.2 ± 3.5 [× 104ind. m−3]，n= 8；2017年：1.1 ± 5.4，n= 11；2018年： 0.94 ± 1.81,n= 10)。桡足类无节幼体在 0-5 m 深度非常丰富（最大为 8.1 × 102ind. m−3），但在 35 m 以下深度则不存在；这意味着桡足类在被释放后迅速从表层消失，主要是由于捕食/非捕食死亡或从无节幼体发育到桡足类阶段。总体而言，结果表明，陆架区域形成的海冰将一些与冰相关的桡足类动物运送到更北的地方，为远洋捕食者提供食物，尽管S. longipesis 也是 MIZ 的主要消费者。
The ice-associated copepodsStephos longipes,Paralabidocera antarctica, andDrescheriella glacialisare the dominant species inhabiting Antarctic sea ice. They influence the pelagic ecosystem after being released into the water column when the ice melts from spring to summer in the marginal ice zone (MIZ), although less is known about those in the off-shelf region. We investigated the occurrence of copepods in drifting sea-ice floes and the adjacent water column off Vincennes Bay in the Indian sector of the Southern Ocean in mid-summer (January) of 2014 and 2016–2018. Sea-ice samples from the ice-growth season (February–March) collected off Australia’s Mawson Station (2016,n= 1) and Cape Darnley (2018,n= 2) provide some comparison with the ice-melt season. In the ice floes off Vincennes Bay,S. longipesand harpacticoid nauplii were abundant, but also highly variable (2016: 2.2 ± 3.5 [× 104ind. m−3],n= 8; 2017: 1.1 ± 5.4,n= 11; 2018: 0.94 ± 1.81,n= 10). Copepod nauplii were very abundant at 0–5 m depths (maximum of 8.1 × 102ind. m−3), but absent at depths below 35 m; this implies that copepods disappear rapidly from the surface layer after being released, mainly due to predation/non-predation death or development from the nauplius to the copepodite stages. Overall, the results indicate that sea ice forming in shelf regions transports some of the ice-associated copepods further north, which supplies food to pelagic predators, althoughS. longipesis also a primary consumer in the MIZ.