Fe and Mn in Antarctic bivales: Indicators of change in near-shore biogeochemistry?

本文验证了南极软壳蛤（Laternula elliptica）组织和壳基质中微量元素（Fe, Mn）浓度反映了融水驱动的环境中微量元素负荷的假设。组织应该反映急性浓度，而壳档案则表明冰川在空间和时间上的发育和融化。通过将双壳贝暴露于颗粒铁和溶解铁（Fe）中，研究了双壳贝对微量元素的吸收、结合和释放。本文将分析不同组织对铁的吸收以及铁进入壳的途径。此外，将从乔治国王岛冰川融化速度快和慢的地点收集动物，并将铁和锰纳入LA-ICP-MS测量的年生长带。

We test the hypothesis that trace element (Fe, Mn) concentrations in both tissues and shell matrix of the Antarctic soft shell clam Laternula elliptica reflect melt water driven trace element load in the environment. The tissue should reflect the acute concentrations, whereas the shell archives signals of glacial development and melt-ing in space and over time. Trace element uptake, incorporation and release by the bivalve L. elliptica will be investigated in experiments, by exposing bivalves to par-ticulate and dissolved iron (Fe). Fe uptake into different tissues and the pathways of incorporation into shell will be analyzed. Further, animals will be collected from sites with fast and slow glacier melt rates at King-George Island and incorporation of Fe and Mn into yearly growth bands measured with LA-ICP-MS.