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首页> 外文期刊>Oceanologia >Annual cycle of phytoplankton community through the water column: Study applied to the implementation of bivalve offshore aquaculture in the southeastern Bay of Biscay
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Annual cycle of phytoplankton community through the water column: Study applied to the implementation of bivalve offshore aquaculture in the southeastern Bay of Biscay

机译：水柱中浮游植物群落的年循环：这项研究适用于在比斯开湾东南部实施双壳类近海水产养殖

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This study describes, for the first time, the annual variability of phytoplankton community in different layers of the water column in open waters off the Basque coast (southeastern Bay of Biscay). Phytoplankton composition, abundance and biomass, together with size-fractionated chlorophyll a , nutrients, and optical and hydrographic conditions were measured in an experimental bivalve culture area from May 2014 to June 2015. Water column conditions showed the typical dynamics previously described for temperate areas, characterised by winter homogeneity and summer stratification. Phytoplankton temporal variability was studied at depths of 3, 17 and 33?m, and was found to be related to those processes. In particular, temperature and nutrients (mostly nitrate and silicate) were the environmental variables which significantly explained most of the variability of chlorophyll concentration, whereas river flow was the main driver of abundance variability. Total chlorophyll was generally low (0.6?μg?Lsup?1/sup on average). Of the 194 registered taxa, 47.4% belonged to dinoflagellates and 35.1% to diatoms. In addition, diatoms showed the highest biomass values, and haptophytes represented the greatest contribution to cell-abundance. This fact, despite the low chlorophyll values indicating low phytoplankton biomass, could favour mussel growth given the high fatty acid content reported for diatoms and haptophytes.
机译：这项研究首次描述了巴斯克海岸（比斯开东南湾）附近开阔水域水柱不同层中浮游植物群落的年度变化。在2014年5月至2015年6月的实验双壳类养殖区中测量了浮游植物的组成，丰度和生物量，以及大小分级的叶绿素a，养分以及光学和水文条件。冬季均一，夏季分层。在3、17和33？m深度研究了浮游植物的时间变异性，发现与这些过程有关。特别地，温度和养分（主要是硝酸盐和硅酸盐）是环境变量，可显着解释大多数叶绿素浓度的变化，而河流流量是丰度变化的主要驱动力。总叶绿素通常较低（平均为0.6？μg？L ？1 ）。在194个注册的分类单元中，有47.4％属于鞭毛藻，而35.1％属于硅藻。此外，硅藻显示出最高的生物量值，而触藻植物对细胞丰度的贡献最大。尽管叶绿素值低表明浮游植物生物量低，但由于硅藻和触藻类植物的脂肪酸含量较高，这一事实可能有利于贻贝的生长。

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