Spatial and inter-decadal variability in plankton abundance and composition in the Northwest Atlantic (1958-2006)
Spatial and inter-decadal variability in plankton abundance and composition in the Northwest Atlantic (1958-2006)
复制标题
DOI：
10.1093/plankt/fbq090
复制
发表时间：
2010-12-01
影响因子：
2.1
通讯作者：
Pepin, Pierre
中科院分区：
文献类型：
--
作者：
Head, Erica J. H.;Pepin, Pierre
本文介绍了1958年至2006年西北大西洋8个陆架和深海区域11个浮游生物分类群的连续浮游生物记录仪采样结果。对于大陆架地区，浮游植物丰度增加，在20世纪90年代初，主要是在冬季，作为北极淡水的纽芬兰（NLS）和斯科舍架（SS）的贡献增加。在更远的东部，在副极地环流中，浮游植物的数量在1990年代和2000年代随着气温的上升而增加。在这两个领域，变化可以用分层增加来解释。20世纪90年代北极水流入NLS的增加也可能是两种北极哲水蚤物种丰度增加的直接原因。glacialis和C. hyperboreus），并间接导致哲水蚤I ~ IV（主要是哲水蚤C. finmarchicus），也许通过食物成分的变化。在SS上，北极哲水蚤物种在2000年代大量增加，可能是由于通过圣劳伦斯湾从北极运输的增加。在深海，浮游生物的季节性周期几十年来变化不大，2000年代浮游植物水平的增加伴随着浮游动物丰度的增加，这表明自下而上的控制。在大陆架地区，浮游植物的增加，在20世纪90年代是在冬季和哲水蚤I-IV出现在春季比前几十年。然而，浮游动物的水平总体上没有变化，也许是因为所检查的物种在冬季主要不活跃。
The results of Continuous Plankton Recorder sampling in the NW Atlantic between 1958 and 2006 are presented for 11 plankton taxa in eight shelf and deep ocean regions. For shelf regions, phytoplankton abundances increased in the early 1990s, mainly in winter, as the contribution of Arctic-derived freshwater to the Newfoundland (NLS) and Scotian shelves (SS) increased. Farther east, in the sub-polar gyre, phytoplankton levels increased with rising temperatures during the 1990s and 2000s. In both areas, the changes can be explained by increased stratification. The increased influx of arctic water to the NLS in the 1990s was also probably directly responsible for the increased abundances of two arctic Calanus species (C. glacialis and C. hyperboreus) and indirectly responsible for the decreased abundance of Calanus I-IV (mainly C. finmarchicus), perhaps via changes in food composition. On the SS the arctic Calanus species increased in abundance in the 2000s, likely as the result of increased transport from the Arctic via the Gulf of St Lawrence. In the deep ocean, plankton seasonal cycles changed little over the decades and increasing phytoplankton levels in the 2000s were accompanied by increases in zooplankton abundance, suggesting bottom-up control. In shelf regions, phytoplankton increases in the 1990s were in winter and Calanus I-IV appeared earlier in spring than in previous decades. Zooplankton levels generally did not change overall however, perhaps because the species examined were mainly inactive during winter.