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首页> 外文期刊>Journal of oceanography >Do River Discharge Rates Drive the Overall Functioning of the Pelagic Ecosystem over the Continental Shelf of the Bay of Biscay (NE Atlantic)? A Comparison of Two Contrasting Years with Special Reference to Anchovy (Engraulis encrasicolus L.) Nutritional State
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Do River Discharge Rates Drive the Overall Functioning of the Pelagic Ecosystem over the Continental Shelf of the Bay of Biscay (NE Atlantic)? A Comparison of Two Contrasting Years with Special Reference to Anchovy (Engraulis encrasicolus L.) Nutritional State

机译：河流排放速度是否会驱动比斯开湾（东北大西洋）大陆架上的中上层生态系统的整体功能？比较两个不同年份，特别提到An鱼（Engraulis encrasicolus L.）的营养状况

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In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong difference in the freshwater outflow rates from the two main large rivers, the Loire and the Gironde, which was principally responsible for the inter-annual fluctuations of the nutrients in the Bay. This overall influence of river flow results in a characteristic pattern of sea-surface salinity, which was reflected by the phytoplankton biomass distribution. Mesozooplankton enzyme activities showed high variations between the two years. The contrast in the dynamics of the pelagic food web processes between the two consecutive years, with higher activity in 2001, affected the nutritional condition of the zooplanktivorous breeding anchovy Engraulis encrasicolus.
机译：在2000年和2001年春季，中游浮游生物样本是在研究航行期间系统地采集的，该游轮致力于研究东北大西洋比斯开湾，陆架的法国部分中上层小鱼的分布和数量。在这些中型浮游动物样品中测量了三种酶的同时活性，以表征区域尺度上生态系统功能的主要特征。目的是通过丙酮酸激酶活性评估碳水化合物的同化率，通过中速浮游动物群落通过胰蛋白酶的活性来评估蛋白质的同化率，以及通过天冬氨酸转氨甲酰酶的活性来评估由此产生的总生产率。对中上层环境的最大影响是卢瓦尔河和吉伦特河这两个主要大型河流的淡水流出率之间的巨大差异，这主要是造成海湾养分年年波动的原因。河流流量的总体影响导致海面盐度的特征性模式，这反映在浮游植物生物量的分布上。中生浮游生物的酶活性在两年之间显示出很高的变化。连续两年间中上层食物网过程的动态变化与2001年的活动增加形成对比，影响了浮游动物En鱼Engraulis encrasicolus的营养状况。

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