Influence of the porewater geochemistry on Fe and Mn assimilation in Laternula elliptica at King George Island (Antarctica)
Influence of the porewater geochemistry on Fe and Mn assimilation in Laternula elliptica at King George Island (Antarctica)
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DOI：
10.1016/j.ecss.2013.10.027
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发表时间：
2013-12-20
影响因子：
2.8
通讯作者：
Abele, Doris
中科院分区：
文献类型：
--
作者：
Poigner, Harald;Monien, Patrick;Abele, Doris
来自冰川的大量成岩沉积物被认为是造成乔治王岛南极椭圆海蚌中Fe和Mn含量高的原因。事实上，撤退实验表明，铁含量的双壳贝类血淋巴中的环境浓度的强烈影响，但没有显着差异，血淋巴和组织浓度之间的两个网站的高和低输入的成石碎片。比较铁和锰浓度的孔隙水，底层水，和血淋巴从采样点，锰似乎被同化为溶解的物种，而铁显然沉淀在好氧的沉积物或底层水体中的铁水化物同化前的双壳类。因此，我们认为铁和锰积累在组织中的高变异性。椭圆形的南极洲周围的沉积物的地球化学环境的差异，并由此产生的铁和锰通量跨越底栖边界。(C)2013爱思唯尔有限公司保留所有权利。
A high input of lithogenic sediment from glaciers was assumed to be responsible for high Fe and Mn contents in the Antarctic soft shell clam Laternula elliptica at King George Island. Indeed, withdrawal experiments indicated a strong influence of environmental Fe concentrations on Fe contents in bivalve hemolymph, but no significant differences in hemolymph and tissue concentrations were found among two sites of high and lower input of lithogenic debris. Comparing Fe and Mn concentrations of porewater, bottom water, and hemolymph from sampling sites, Mn appears to be assimilated as dissolved species, whereas Fe apparently precipitates as ferrihydrite within the oxic sediment or bottom water layer prior to assimilation by the bivalve. Hence, we attribute the high variability of Fe and Mn accumulation in tissues of L. elliptica around Antarctica to differences in the geochemical environment of the sediment and the resulting Fe and Mn flux across the benthic boundary. (C) 2013 Elsevier Ltd. All rights reserved.