The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species

被引:169
作者
Crosta, X
Romero, O
Armand, LK
Pichon, JJ
机构
[1] Univ Bordeaux 1, DGO, UMR 5805, CNRS,EPOC, F-33405 Talence, France
[2] Univ Bremen, Dept Geosci, D-28334 Bremen, Germany
[3] Univ Tasmania, Sch Earth Sci, Hobart, Tas 7001, Australia
基金
澳大利亚研究理事会;
关键词
diatom; Bacillariophyceae; biogeography; PCOZ; Southern Ocean; sediments;
D O I
10.1016/j.palaeo.2005.03.028
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Diatom assemblages from 228 core-top samples were investigated to determine the modem geographic distributions of 10 major open ocean species or species groups in the Atlantic and Indian sectors of the Southern Ocean. Our study gives a more comprehensive view of the relationships between diatom distribution and environmental pressures than previous studies, as our modem database covers a much wider area, and additionally highlights the relationships with sea ice cover and concentration. The 10 species or species categories can mainly be lumped into three groupings. First, a cool open ocean grouping composed of Rhizosolenia pointed group, Thalassiosira gracilis group and Trichotoxon reinboldii with maximum relative abundances occurring within the maximum winter sea-ice edge. Second, a pelagic open ocean grouping composed of Fragilariopsis kerguelensis, Thalassiosira lentiginosa, Thalassiosira oliverana and Thalassiothrix spp. group with maximum occurrences at the Antarctic Polar Front. Third, a warm open ocean grouping with maximum abundances observed within the Polar Front Zone and composed of the Rhizosolenia rounded group, the Thalassionenza nitzschioides var. nitzschioides group and the Thalassionema nitzschioides var. lanceolata. Comparisons of the abovementioned 10 species or species groups with modem February sea-surface temperatures and sea-ice duration and concentration reveal species-specific sedimentary distributions regulated both by sea-surface temperatures and sea ice conditions that support the use of diatom remains to reconstruct past variations of these environmental parameters via qualitative and transfer ftinction approaches. (c) 2005 Elsevier B.V All rights reserved.
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页码:66 / 92
页数:27
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