milan米兰体育官方网站 北冰洋夏季海冰下浮游有孔虫的分布和丰度

引用

Vermassen F、Bird C、Weitkamp TM、Darling KF、Farnelid H、Heuzé C、Hsiang AY、Karam S、Stranne C、Sundbom M 和 Coxall HK (2025) 北冰洋夏季海冰下浮游有孔虫的分布和丰度。生物地球科学，22 (9)，第 2261-2286 页。 https://doi.org/10.5194/bg-22-2261-2025

摘要
浮游有孔虫是钙化原生生物，代表中上层微型浮游动物的一小部分但很重要。它们存在于地球上所有的海洋盆地中，并在沉积物记录中得到广泛研究，以重建整个地质时期的气候和环境变化。为了应对现代气候变化，北冰洋目前正在发生变化；然而，对浮游有孔虫种群的影响实际上尚不清楚。在这里，我们提供了北冰洋“高位”浮游有孔虫群落的首次系统采样——在这项工作中，北冰洋被定义为北纬 80°以北的区域——特别是位于格陵兰岛北部（林肯海及其毗邻的峡湾和莫里斯杰苏普海隆）、耶尔马克高原和北极之间的广大地区。使用多重网进行分层深度拖曳至 1000 米，以揭示夏季海冰以下这些群落的物种组成和空间变异性。北冰洋中部顶部 200 m 的平均丰度在 15 至 65 m−3 之间，0.3 individuals m−3 in the shelf area of the Lincoln Sea. At all stations, except one site at the Yermak Plateau, assemblages consisted solely of the polar specialist Neogloboquadrina pachyderma. It predominated in the top 100 m, where it was likely feeding on phytoplankton below the ice. Near the Yermak Plateau, at the outer edge of the pack ice, rare specimens of Turborotalita quinqueloba occurred that appeared to be associated with the inflowing Atlantic Water layer. Our results would suggest that the anticipated turnover from polar to subpolar planktonic species in the perennially ice-covered part of the central Arctic Ocean has not yet occurred, in agreement with a recent meta-analysis from the Fram Strait which suggested that the increased export of sea ice is blocking the influx of Atlantic-sourced species. The presented data set will be a valuable reference for continued monitoring of the abundance and composition of planktonic foraminifera communities as they respond to the ongoing sea-ice decline and the “Atlantification” of the Arctic Ocean basin. Additionally, the results can be used to assist paleoceanographic interpretations, based on sedimented foraminifera assemblages.

期刊
生物地球科学：第 22 卷，第 9 期

• 北冰洋夏季海冰下浮游有孔虫的分布和丰度