FORAMINIFERAL ASSEMBLAGES FROM THE FJORDS AND SHELF OF EASTERN GREENLAND
FORAMINIFERAL ASSEMBLAGES FROM THE FJORDS AND SHELF OF EASTERN GREENLAND
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DOI：
10.2113/gsjfr.24.2.123
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发表时间：
1994-04-01
影响因子：
1.1
通讯作者：
HELGADOTTIR, G
中科院分区：
文献类型：
--
作者：
JENNINGS, AE;HELGADOTTIR, G
对来自三个峡湾和格陵兰岛东部陆架的 12 个样本进行了有孔虫分析，以观察现代有孔虫组合及其与沉积物性质和水团特征的关系。对 >63 mum 和 > 125 mum 部分进行了分析，以确定应使用什么尺寸的部分用于格陵兰东部沿线的未来生物地层学和古环境研究。我们发现格陵兰岛东部峡湾和陆架支持混合钙质/胶凝组合。最常见的凝集物种是 Textularia Earlandi、Spiroplectammina biformis、Trochammina nana 和 Saccammina difflugiformis。最常见的钙质物种是 Cassidulina reniforme、C. teretis、Elphidium excavatum 和 Lobatula lobatula。峡湾中的组合似乎与底层水体特征有关，在海底极地水（米基斯峡湾）处以凝集有孔虫为主，在海底大西洋中层水（康格德鲁格苏阿克峡湾）处发现了混合钙质/凝集动物群。在南森峡湾，在极地和大西洋水域之间的水团过渡中，发现了主要是凝集的组合。 63 至 125 mum 尺寸部分中的有孔虫数量比 > 125 mum 尺寸部分中的有孔虫丰富度高出 23 倍。尽管这两个尺寸部分的物种组成差异很大，但 >63 mum 部分和 >125 mum 部分的主成分分析显示了相似的结果。然而，使用 >125 mum 分数可以更好地定义环境变量（尤其是底层水盐度和 pH 值）和动物群之间的关联。
Twelve grab samples from three fjords and the shelf of eastern Greenland were analyzed for foraminifera to observe the modern foraminifera assemblages and their relations to sediment properties and water mass characteristics. Both the >63 mum and the > 125 mum fractions were analyzed to determine what size fraction should be used for future biostratigraphic and paleoenvironmental studies along eastern Greenland. We found that the east Greenland fjords and shelf support a mixed calcareous/agglutinated assemblage. The most common agglutinated species are Textularia earlandi, Spiroplectammina biformis, Trochammina nana, and Saccammina difflugiformis. The most common calcareous species are Cassidulina reniforme, C. teretis, Elphidium excavatum, and Lobatula lobatula. The assemblages in the fjords appear to be associated with bottom water mass characteristics, with agglutinated foraminifera dominating sites with Polar Water at the seafloor (Mikis Fjord) and a mixed calcareous/agglutinated fauna found at sites with Atlantic Intermediate Water at the seafloor (Kangerdlugssuaq Fjord). In Nansen Fjord, with a water mass transitional between the Polar and Atlantic waters, a mainly agglutinated assemblage was found. Foraminifera were up to 23 times more abundant in the 63 to 125 mum size fraction than they were in the >125 mum size fraction. Although the species composition of these two size fractions differed substantially, principal components analysis of the >63 mum fraction and the >125 mum fraction showed similar results. However, the association between environmental variables (especially bottom water salinity and pH) and fauna was better defined using the >125 mum fraction.