LIVE BENTHIC FORAMINIFERAL FAUNAS ALONG A BATHYMETRICAL TRANSECT (282–4987 M) ON THE PORTUGUESE MARGIN (NE ATLANTIC)
LIVE BENTHIC FORAMINIFERAL FAUNAS ALONG A BATHYMETRICAL TRANSECT (282–4987 M) ON THE PORTUGUESE MARGIN (NE ATLANTIC)
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葡萄牙边缘（大西洋东北部）沿测深横断面 (282–4987 M) 的活底栖有孔虫动物群
DOI：
10.2113/gsjfr.42.1.66
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发表时间：
2012
影响因子：
1.1
通讯作者：
H. Stigter
中科院分区：
文献类型：
--
作者：
Mark Phipps;F. Jorissen;A. Pusceddu;S. Bianchelli;H. Stigter
在葡萄牙边界沿282-4987 m深度样带收集的8个岩心中研究了活底栖有孔虫。在样带沿线的站点之间，比较了63-150亩和50- 150亩的群落的总存量（TSS）和物种组合，并与比斯开湾和伊比利亚西部边缘的活有孔虫研究进行了比较。根据沉积有机质含量和回收有孔虫的生态特征，将其划分为3组站点：（1)富营养化上坡站（海拔282 ~ 1002 m）以地中海绒毡虫、长叶绒毡虫、黑绒毡虫、野绒毡虫、白绒毡虫、玻璃Epistominella vitrea）、长绒毡虫和粗绒毡虫为主；(2)中低坡站（海拔1374 ~ 2475 m）以细绒毡虫、亲缘圆绒毡虫和长绒毡虫为主；(3)低营养化斜坡和深海平原站（2908-4987 m），动物规模较大，以Cibicides kullenbergi和Reophax fusiformis和Recurvoides sp等凝集种为主。较小的部分主要是机会性钙质物种，如Bulimina translucens、Epistominella exigua和Nuttallides pusillus以及Reophax fusiformis，但这些物种大多数在4987 m处减少，Reophax fusiformis、Pullenia salisburyi和各种单thalamous凝集物占主导地位。这种组合的演替可能反映了营养资源随着水深的增加而日益稀缺。这一假设得到了证实：1)随着水深的增加，TSS明显下降；2)沉积物中植物色素浓度向更深的位置下降。此外，多孔钙质有孔虫的比例随水深的增加而减少，而凝集有孔虫的比例则增加，这表明一般来说，多孔钙质有孔虫比凝集有孔虫有更高的营养需求。
Live benthic foraminifera were studied in eight cores collected along a depth transect ranging 282-4987 m on the Portuguese margin. Total standing stocks (TSS) and species assemblages from both 63-150- and >150-mu m fractions are compared between stations along the transect and with previous live foraminiferal studies from the Bay of Biscay and western Iberian margin. Based on the sedimentary organic matter contents and ecological traits of the retrieved foraminifera, three groups of stations are distinguished: (1) eutrophic upper-slope stations (282-1002 m) with faunas dominated by Uvigerina mediterranea, U. elongatastriata, Melonis barleeanus, Bigenerina nodosaria, Trifarina bradyi, Epistominella vitrea, Cribrostomoides bradyi, and Bolivina robusta, (2) mesotrophic middle- to lower-slope stations (1374-2475 m) with faunas dominated by Uvigerina peregrina, Globobulimina affinis, and Repmanina charoides, and (3) oligotrophic lower-slope and abyssal-plain stations (2908-4987 m) with faunas in the larger size fraction dominated by Cibicides kullenbergi and agglutinated species such as Reophax fusiformis and Recurvoides sp. 1. The smaller size fraction is dominated by opportunistic calcareous species such as Bulimina translucens, Epistominella exigua, and Nuttallides pusillus, along with Reophax fusiformis, but most of these species are diminished at 4987 m, where Reophax fusiformis, Pullenia salisburyi, and various monothalamous agglutinates are dominant. This succession of assemblages probably reflects the increasing scarcity of trophic resources with water depth. This hypothesis is corroborated by 1) the clear decrease of TSS with increasing water depth, and 2) the decreasing sediment phytopigment concentrations towards deeper sites. Moreover, the decreasing percentage of perforate calcareous foraminifera, and increasing percentage of agglutinated foraminifera with water depth, suggests that, in general, perforate calcareous species have higher trophic requirements than agglutinated ones.