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Temporal changes in pelagic copepod assemblages off Ubatuba, Brazil

机译：巴西乌巴图巴附近上层co足类种群的时间变化

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摘要

The inner shelf waters off Southeastern Brazil are periodically enriched by bottom intrusions of the cold and nutrient-rich South Atlantic Central Water (SACW), which is transported offshore by the Brazil Current. This study examined the temporal contrasts in abundance and structure of pelagic copepod assemblages in a neritic station off Ubatuba, in relation to hydrography and phytoplankton biomass, to investigate the effects of SACW bottom intrusions on copepod population dynamics during three consecutive years. The water-column characteristics shifted from a well-mixed, more turbid and phytoplankton-poor scenario during subsidence conditions to a stratified, less turbid and high Chl-a concentration scenario during SACW bottom intrusions, leading to increased copepod diversity, abundance, and biomass. The rise in copepod diversity during SACW intrusions was related to the contribution of oceanic species in addition to coastal water species. The copepod community was numerically dominated by small-sized species, such as Oncaea waldemari, Oithona plumifera, and clausocalanid and paracalanid copepodids, regardless of seasonality and SACW intrusions. Some large calanoid species contributed considerably to the total copepod biomass during intrusions. In addition to confirming that SACW seasonal intrusions play a key role in pelagic processes off Southeast Brazil, this study showed that the multiannual variability of SACW seasonal intrusions is important in regulating the structure and dynamics of copepod communities in this subtropical area.
机译：巴西东南部的内陆架水定期被富含营养的冷和南大西洋南大西洋中央水（SACW）的底部侵入所充实，该水由巴西洋流运往近海。这项研究检查了乌巴图巴附近一个中枢站的浮游co足类组合物的丰度和结构的时间差异，与水文学和浮游植物生物量有关，以调查SACW底部侵入对连续足pe类种群动态的影响。水柱特征从沉陷条件下混合均匀，混浊和浮游植物贫乏的情况转变为SACW底部侵入过程中分层，混浊和高Chl-a浓度的情况，从而导致leading足类动物多样性，丰度和生物量增加。 SACW入侵期间co足类多样性的增加与除沿海水域物种外的海洋物种的贡献有关。 pe足类群落在数量上受小型物种的支配，例如Oncaea waldemari，Oithona plumifera，clausocalanid和paracalanid copepodids，无论季节和SACW入侵如何。在入侵过程中，一些大型的类颅动物物种对to足类的生物量有很大贡献。除了证实SACW季节性入侵在巴西东南部远洋过程中起关键作用外，这项研究还表明SACW季节性入侵的多年变化对于调节该亚热带地区co足类群落的结构和动态很重要。

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