The community composition of zooplankton with an emphasis on copepods was assessed in the frontal zones of the Indian sector of the Southern Ocean (SO) during summer 2013. Copepods were the dominant group in both the bongo net and multiple plankton sampler across the entire region. High zooplankton abundance was recorded along each transect in the Polar Front (PF). Community structure in this front was dominated by common taxa, including Ctenocalanus citer, Clausocalanus spp., Calanoides acutus, Calanus propinquus, Calanus australis and Rhincalanus gigas, which together accounted for > 62% of the total abundance. Calocalanus spp., Neocalanus tonsus and C. propinquus were indicator species in the Sub-Tropical Front (STF), Sub-Antarctic Front and PF, respectively. A strong contrast in population structure and biovolume was observed between then PF and the STF. The community structure of smaller copepods was associated with the high-temperature region, whereas communities of larger copepods were associated with the low-temperature region. Thus, it seems probable that physical and biological characteristics of the SO frontal regions are controlling the abundance and distribution of zooplankton community structure by restricting some species to the warmer stratified zones and some species to the well-mixed zone.

中文翻译：

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南大洋印度海域浮游动物的分布

2013 年夏季，在南大洋印度区 (SO) 的锋区评估了以桡足类为重点的浮游动物群落组成。桡足类是整个地区的邦戈网和多个浮游生物采样器中的主要群体。沿极地前沿（PF）的每个样带记录了高浮游动物丰度。该前沿的群落结构以常见分类群为主，包括栉水母,克劳加兰种，尖嘴鲶,葫芦,南菖蒲和大犀牛, 合计占总丰度的 62% 以上。鲶鱼种，扁桃体和C. propinquus分别是亚热带锋（STF）、亚南极锋和PF的指示物种。在当时的 PF 和 STF 之间观察到人口结构和生物体积的强烈对比。较小的桡足类群落结构与高温区有关，而较大的桡足类群落与低温区有关。因此，SO锋区的物理和生物学特征似乎可能通过将一些物种限制在较温暖的分层区和将一些物种限制在充分混合区来控制浮游动物群落结构的丰度和分布。