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首页> 外文期刊>Polar biology >The role of local and regional environmental factors for Calanus finmarchicus and C-hyperboreus abundances in the Nordic Seas
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The role of local and regional environmental factors for Calanus finmarchicus and C-hyperboreus abundances in the Nordic Seas

机译：局部和区域环境因素在北欧海中的象鼻藻和C藻类丰富度的作用

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摘要

In the advective realm of the seas, it is challenging to disentangle the role of regional and local processes on zooplankton populations. However, comparative studies of spatially separated zooplankton populations can provide valuable insights into this issue. We studied interannual abundance variation of the key zooplankton species Calanus finmarchicus and C. hyperboreus in three near-shore locations of the Nordic Seas: off northern Norway, Svalbard, and northern Iceland. Average abundances of both species were similar among locations, while in each location the abundance of C. finmarchicus was about an order of magnitude higher than the abundance of C. hyperboreus. The abundance of both species decreased in northern Norway, while C. finmarchicus abundance increased in northern Iceland. C. finmarchicus abundance in northern Norway covaried with regional climate, while the Svalbard Calanus populations were related to local environment (hydrography, phytoplankton). In northern Iceland, C. finmarchicus abundance covaried with local environmental factors, while C. hyperboreus abundance covaried with climate variability. Top-down forcing could not be investigated. The results indicate that the mechanisms relating regional climate variability (North Atlantic and Arctic oscillations) to Calanus abundance are mediated through advection of water masses, while more local environmental variability involved bottom-up processes or advection.
机译：在海洋的对流领域，要想弄清区域性和局部性过程对浮游动物种群的作用是具有挑战性的。但是，对空间上分离的浮游动物种群的比较研究可以为这个问题提供有价值的见解。我们研究了北欧海的三个近岸位置：挪威北部，斯瓦尔巴特群岛和冰岛北部附近三个主要浮游动物物种Calaus finmarchicus和C. hyperboreus的年际丰度变化。这两个物种的平均丰度在位置之间相似，而在每个位置，finmarchicus的丰度都比高硼酸碳的丰度高一个数量级。挪威北部两种物种的丰度都下降了，而冰岛北部的C. finmarchicus丰度却有所提高。挪威北部的C. finmarchicus丰度与区域气候相关，而斯瓦尔巴德群岛的卡纳努斯种群与当地环境（水文学，浮游植物）有关。在冰岛北部，finmarchicus的丰度与当地环境因素相关，而高硼酸杆菌的丰度与气候变化相关。无法调查自上而下的强迫。结果表明，与区域气候变化（北大西洋和北极涛动）有关的Calanus丰度的机制是通过水团的平流介导的，而更多的局部环境变化则涉及自下而上的过程或平流。

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