Iron assimilation by the clam Laternula elliptica: Do stable isotopes (δ⁵⁶Fe) help to decipher the sources?

Iron assimilation by the clam Laternula elliptica: Do stable isotopes (δ⁵⁶Fe) help to decipher the sources?
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椭圆蛤对铁的同化:稳定同位素 (δFe) 是否有助于破译来源?

DOI:
10.1016/j.chemosphere.2015.04.067
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发表时间:
2015
期刊:
影响因子:
8.8
通讯作者:
S. Henkel
S. Henkel
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Poigner;D. Wilhelms-Dick;D. Abele;M. Staubwasser;S. Henkel

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采用多收集器电感耦合等离子体质谱(MC-ICP-MS)技术分析了南极双壳类鱼(Laternula elliptica)血淋巴中铁的稳定同位素(δ 56 Fe)特征,以验证其同位素指纹是否可以追溯到同化铁的主要来源。早期的铁浓度调查L. ellipticahemolymph的研究表明,从底栖边界附近的孔隙水Fe中沉淀的活性和生物可利用的Fe(oxyhydr)氧化物颗粒(即铁水化物)的同化作用是导致L中Fe浓度高的原因。椭圆藻属(Poigner等人,在Potter Cove(南极洲国王乔治岛)的两个站位,双壳贝类血淋巴的δ 56 Fe平均值分别为−1.19 ± 0.34‰和−1.04 ± 0.39‰,比表层沉积物中易还原的Fe(羟基)氧化物池(−0.3‰至−0.6‰)轻0.5‰至0.85‰。这与较轻的铁同位素富集在更高的营养水平,从营养的光同位素的优先同化。尽管如此,两个站点的δ 56 Fe血淋巴值显示出很高的变异性,范围在−0.21‰(接近未改变/原生Fe(氧氢)氧化物矿物的值)和−1.91‰(孔隙水Fe或成岩Fe沉淀物的典型值)之间,我们将其解释为不同来源的Fe同化导致的“混合”δ 56 Fe特征,具有不同的Fe含量和δ 56 Fe值。此外,不能排除与质量相关的铁分馏的生理过程中的双壳类。这是第一个研究解决的潜在的铁同位素追溯食物来源的双壳类。
Iron stable isotope signatures (δ56Fe) in hemolymph (bivalve blood) of the Antarctic bivalveLaternula ellipticawere analyzed by Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry (MC-ICP-MS) to test whether the isotopic fingerprint can be tracked back to the predominant sources of the assimilated Fe. An earlier investigation of Fe concentrations inL. ellipticahemolymph suggested that an assimilation of reactive and bioavailable Fe (oxyhydr)oxide particles (i.e. ferrihydrite), precipitated from pore water Fe around the benthic boundary, is responsible for the high Fe concentration inL. elliptica(Poigner et al., 2013b).At two stations in Potter Cove (King George Island, Antarctica) bivalve hemolymph showed mean δ56Fe values of −1.19 ± 0.34‰ and −1.04 ± 0.39‰, respectively, which is between 0.5‰ and 0.85‰ lighter than the pool of easily reducible Fe (oxyhydr)oxides of the surface sediments (−0.3‰ to −0.6‰). This is in agreement with the enrichment of lighter Fe isotopes at higher trophic levels, resulting from the preferential assimilation of light isotopes from nutrition. Nevertheless, δ56Fe hemolymph values from both stations showed a high variability, ranging between −0.21‰ (value close to unaltered/primary Fe(oxyhydr)oxide minerals) and −1.91‰ (typical for pore water Fe or diagenetic Fe precipitates), which we interpret as a “mixed” δ56Fe signature caused by Fe assimilation from different sources with varying Fe contents and δ56Fe values. Furthermore, mass dependent Fe fractionation related to physiological processes within the bivalve cannot be ruled out.This is the first study addressing the potential of Fe isotopes for tracing back food sources of bivalves.
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