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首页> 外文期刊>ICES Journal of Marine Science >Mesozooplankton size-fractionated metabolism and feeding off NW Spain during autumn: effects of a poleward current
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Mesozooplankton size-fractionated metabolism and feeding off NW Spain during autumn: effects of a poleward current

机译：Mesozooplankton大小分级的新陈代谢和秋季西班牙西北部的觅食：极地电流的影响

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Two consecutive cruises were carried out off NW Spain in October 1999 in an attempt to obtain information on the poleward current that affects the hydrodynamics of this area during autumn and winter. The stations sampled were divided into three zones: coastal (C), between the saline intrusion and the coast; poleward current (P), where salinity at 100-m depth was > 35.85; and oceanic (O), outside the poleward current. Phytoplankton biomass, integrated through the photic zone, was similar for the three zones. Conversely, mesozooplankton biomass showed high spatial variation, with the lowest values associated with the high-salinity current. There was a decreasing trend in the relative importance of the biomass of the largest size class (> 1000 μm) from coastal to oceanic zones. The lowest percentages of both Chl a and primary production ingested daily by copepods were measured at the poleward current stations. Specific metabolic rates were not significantly different between zones. The total amount of carbon respired and the NH_4 and PO_4 released were highest in coastal areas and lowest within the poleward current, in agreement with the pattern observed for mesozooplankton biomass. Diel vertical migrations were more marked in the coastal areas, decreasing gradually towards the oceanic stations. The role of mesozooplankton in promoting the flux of carbon, nitrogen, and phosphorus followed the same spatial distribution. Overall, the contribution of mesozooplankton to biogeochemical cycles seems to be minor in the poleward current compared to the other two zones, possibly as a consequence of the low biomass associated with this current.
机译：1999年10月，在西班牙西北部进行了两次连续的航行，试图获得有关影响该地区秋季和冬季水动力的极流的信息。采样站被划分为三个区域：盐渍入侵和海岸之间的海岸（C）；极向电流（P），其中100-m深度的盐度> 35.85；和海洋（O），在极向洋流之外。在这三个区域，通过光合带整合的浮游植物生物量相似。相反，中层浮游生物质显示出高空间变异性，与高盐度电流相关的数值最低。从沿海到海洋地区，最大尺寸类别（> 1000μm）的生物质的相对重要性呈下降趋势。 the足类动物每天摄入的ward足类和初级产量的最低百分比是在极地电流站测得的。区域之间的特定代谢率无显着差异。与中生浮游生物的观测模式一致，在沿海地区呼吸的碳总量最高，在极地洋流内释放的NH_4和PO_4最高。沿海地区的Diel垂直迁移更为明显，向海洋站逐渐减少。中生浮游生物在促进碳，氮和磷通量中的作用遵循相同的空间分布。总体而言，与其他两个区域相比，中极浮游生物对极地洋流对生物地球化学循环的贡献似乎微不足道，这可能是由于与该洋流相关的生物量较低所致。

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