Approaches and constraints to the reconstruction of palaeoproductivity from Cape Basin abyssal benthic foraminifera (South Atlantic)

Approaches and constraints to the reconstruction of palaeoproductivity from Cape Basin abyssal benthic foraminifera (South Atlantic)
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开普盆地深海底栖有孔虫(南大西洋)古生产力重建的方法和限制

DOI:
10.1144/jmpaleo2015-045
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发表时间:
2016
影响因子:
2
通讯作者:
Diz P
Diz P
中科院分区:
地球科学4区
文献类型:
--
作者:
Diz P

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来自深海充氧环境的底栖有孔虫组合的特征已被用来重建过去的生产力条件。已经开发出的不同方法都不是没有复杂性或适用于所有环境的。在这项研究中,我们评估了使用底栖有孔虫(积累率和组合组成)作为末次冰期(25-95ka)位于开普盆地南部(南纬41.1°,东经7.8°,水深4981米)深海核心古生产力变化的指标。组合特征表明通常食物有限的环境接受不同强度的不稳定有机碳的间歇输入。以植物碎屑形式向海底输送有机物质的高度季节性影响了组合特征,因为相应的反应并不涉及整个群落。机会性物种Epistominella exigua(Brady)受益于这种偶尔出现的高有机投入,它们能够快速繁殖并建立大量种群。一般来说,其余物种(即与甜菜蛾相比机会主义程度较低)仅在种群密度和动物群组成方面表现出细微的变化。在这种情况下,底栖有孔虫积累率似乎与到达沉积物表面的有机通量无关,而是对浮游植物繁殖的强度做出反应。
The characteristics of benthic foraminiferal assemblages from well-oxygenated deep-sea settings have been used to reconstruct past productivity conditions. None of the different approaches that have been developed is without complications or applies in all settings. In this study we assess the use of benthic foraminifera (accumulation rates and assemblages composition) as proxies for palaeoproductivity changes during the last glacial period (25 – 95 ka) in an abyssal core located in the south of Cape Basin (41.1 °S, 7.8 °E, 4981 m water depth). Assemblage characteristics indicate a generally food-limited environment receiving episodic inputs of labile organic carbon of variable strength. High seasonality in the delivery of organic material to the seafloor in the form of phytodetritus influences the assemblage characteristics because the corresponding response does not involve the whole community. Benefiting from this occasionally high organic input is the opportunistic speciesEpistominella exigua(Brady) that reproduces rapidly to build up large populations. In general, the rest of the species (i.e. less opportunistic compared toE. exigua) show only subtle variations in their population densities and fauna composition. Under those circumstances benthic foraminiferal accumulation rates seem to be independent of the amount of organic flux arriving at the sediment surface and respond instead to the strength of phytoplankton blooms.
东北大西洋中部海洋区域深海海底的植物碎屑菌
DOI: --
发表时间: 1989
期刊:
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作者:
H. Thiel;O. Pfannkuche;G. Schrieber;K. Lochte;A. Gooday;C. Hemleben;R. Mantoura;C. Turley;J. Patching;Franz Riemann
通讯作者: Franz Riemann
南纬 68 至 73° 威德尔海东部的底栖有孔虫组合:分布、生态和化石潜力
DOI: --
发表时间: 1990
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作者:
A. Mackensen;H. Grobe;G. Kuhn;D. K. Fu¨tterer
通讯作者: D. K. Fu¨tterer
DOI: --
发表时间: 1997
期刊:
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作者:
C. Smart;A. Gooday
通讯作者: A. Gooday
DOI: --
发表时间: 1997
期刊:
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作者:
P. Froneman;R. Perissinotto;E. Pakhomov
通讯作者: E. Pakhomov
DOI: --
发表时间: 1983
期刊:
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作者:
B. Corliss
通讯作者: B. Corliss