MORPHOLOGY AND MICROHABITAT PREFERENCES OF BENTHIC FORAMINIFERA FROM THE NORTHWEST ATLANTIC-OCEAN
MORPHOLOGY AND MICROHABITAT PREFERENCES OF BENTHIC FORAMINIFERA FROM THE NORTHWEST ATLANTIC-OCEAN
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DOI：
10.1016/0377-8398(91)90014-w
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发表时间：
1991-07-01
影响因子：
1.9
通讯作者：
CORLISS, BH
中科院分区：
文献类型：
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作者：
CORLISS, BH
在加拿大新斯科舍省大陆边缘和缅因州湾200 ~ 3000 m水深的6个箱式岩芯中，测定了孟加拉红染色钙质底栖有孔虫的分布。 在表层沉积物中，这些类群可分为四个微生境。 在至少一个箱式岩芯中，表层动物类群一般在顶部厘米处发现，中层动物类群在1至4厘米处发现，深层动物类群在> 4厘米的沉积物深度处发现。 第四组，浅的底栖动物类群，被发现在顶部2厘米，并推断为底栖动物的基础上，壁孔隙度特性和测试形状类似于底栖动物类群。 表层、浅层和中层底栖动物类群在沉积物中的位置从岩芯到岩芯一直保持不变，而深层底栖动物类群则分布在岩芯中逐渐变浅的沉积物深度处，随着有机碳含量从浅水深度逐渐增加，每种微生境类别都有不同的形态特征。 表生动物类群具有平凸或双凸的横截面，轮螺旋盘绕和大孔缺失或仅在一侧发现。 浅的底栖动物类群具有单螺旋、三螺旋或平螺旋的卷曲，表面卷曲出现在一些类群上。 中间的底栖动物类群有圆形的外周，孔在整个测试和planispiral卷曲，与Cibicidoides bradyi的例外，具有trochospiral卷曲。 深底动物群的分类群，在一般情况下，planispiral或三列盘绕与圆柱形或卵形的测试。
The distribution of Rose Bengal stained calcareous benthic foraminifera was determined in six box cores raised from water depths between 200 and 3000 m on the Nova Scotian continental margin and Gulf of Maine. The taxa can be separated into four microhabitats within the surficial sediments. Epifaunal taxa are generally found in the top cm, intermediate infaunal taxa are found from about 1 to 4 cm and deep infaunal taxa are found at > 4 cm sediment depth in at least one box core. A fourth group, shallow infaunal taxa, is found in the top 2 cm and is inferred to be infaunal based on wall porosity characteristics and test shapes similar to infaunal taxa. The epifaunal, shallow infaunal and intermediate infaunal taxa maintain their positions within the sediments from core to core, whereas the deep infaunal taxa are found at progressively shallower sediment depths in cores within increasing organic carbon contents from shallower water depths.Each microhabitat category has distinct morphological characteristics. Epifaunal taxa have plano-covex or biconvex cross sections, trochospiral coiling and large pores absent or found on only one side. Shallow infaunal taxa have uniserial, triserial, or planispiral coiling, with surface ornamentation present on a number of taxa. The intermediate infaunal taxa have rounded peripheries, pores over the entire test and planispiral coiling, with the exception of Cibicidoides bradyi which has trochospiral coiling. The deep infaunal taxa have, in general, planispiral or triserial coiling with cylindrical or ovate shaped tests.