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首页> 外文期刊>Estuarine Coastal and Shelf Science >The coccolithophore summer-autumn assemblage in the upwelling waters of Portugal: Patterns of mesoscale distribution (1985-2005)
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The coccolithophore summer-autumn assemblage in the upwelling waters of Portugal: Patterns of mesoscale distribution (1985-2005)

机译：葡萄牙上升流中的球石藻夏秋组合：中尺度分布模式（1985-2005年）

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摘要

A study of the mesoscale distribution of phytoplankton communities observed along the Portuguese upwelling coast in 1985-1986 made it possible to identify an assemblage composed by the coccolitho-phores Helicosphaera carteri, Syracosphaera pulchra and Coronosphaera mediterranea. The assemblage was consistently present in the coast in the following years (1991,1992,1994, 2003 and 2005) and from 1992 onwards, Rhabdosphaera davigera was recognised as being part of it, although in low concentrations During late summer, this group of species showed higher affinities with upwelling waters of subtropical origin (ENACWst) on the SW coast. At the end of the upwelling season, in autumn, the assemblage was adverted to the NW shelf due to the intensification of the poleward surface circulation or meridional seasonal changes of environmental conditions. The species maximum abundances were not coincident in space: H. carteri developed at the central part of the western coast while blooms of S. pulchra and C. mediterranea generally occurred further south, such as at the upwelling centre of cape S. Vicente. Syracosphaera pulchra blooms were characterised by lower concentrations of C. mediterranea and vice-versa. The above patterns were recurrent along the years but the relative abundance of each species appeared related to the interannual variability of physical conditions as the upwelling.
机译：对1985-1986年沿葡萄牙上升流海岸的浮游植物群落的中尺度分布进行的研究，使人们有可能确定由球藻Helicosphaera carteri，Syracosphaera pulchra和Coronosphaera mediterranea组成的组合。在随后的几年中（1991、1992、1994、2003和2005年），该组合一直存在于海岸中，从1992年开始，尽管其浓度很低，但仍被认为是Rhabdosphaera davigera的一部分，而在夏季末，这一类物种与西南海岸的亚热带起源上升水（ENACWst）表现出更高的亲和力。在上升季节的末期，在秋天，由于极地表面环流的加剧或环境条件的经向季节性变化，该组合被推荐到西北大陆架。该物种的最大丰度在空间上并不吻合：H。Carteri在西海岸的中部发展，而S. pulchra和C. mediterranea的花朵通常在更南端发生，例如在S. Vicente角的上升中心。 Syracosphaera pulchra花朵的特征是低浓度的C. mediterranea，反之亦然。上述模式多年来反复出现，但每个物种的相对丰度都与上升的物理条件的年际变化有关。

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