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首页> 外文期刊>Estuarine Coastal and Shelf Science >Variation in the mobilization of mercury into Black-winged Stilt Himantopus himantopus chicks in coastal saltpans, as revealed by stable isotopes
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Variation in the mobilization of mercury into Black-winged Stilt Himantopus himantopus chicks in coastal saltpans, as revealed by stable isotopes

机译：稳定同位素揭示的汞在沿海盐田的黑翅高跷Himantopus himantopus雏鸡中的动员量变化

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摘要

Causes of variation in mobilization of mercury into Black-winged Stilt Himantopus himantopus chicks were studied through analysis of stable isotope ratios of carbon and nitrogen. Blood and breast feathers were collected from chicks in coastal saltpans during successive breeding seasons. Detritus samples and potential prey (macroinvertebrates) were also collected. Total mercury concentrations and stable isotope signatures were measured using atomic absorption spectroscopy and isotope ratio mass spectrometry respectively. Mercury levels in Chironomidae, Cor-ixidae and Hydrophilidae correlated with mercury levels in chick feathers. Differences of δ~(15)N signatures between macroinvertebrate groups indicated that they belong to different trophic levels. δ~(15)N signatures of invertebrates correlated with mercury levels in invertebrates and chicks, but not with δ~(15)N signatures in chicks. Between-group and between-site differences of δ~(15)N signatures and mercury levels in invertebrates suggested that they contribute differently to mercury mobilization into chicks, and their relative contribution depends on prey availability in each site. Inter-site differences in the biomagnification factor reinforced that idea. δ~(13)C signatures in invertebrates marked a larger range of carbon sources than just detritus. Variation of water inflow regime and prey availability may cause between-group and between-site differences of δ~(13)C signatures in prey. Discrepancies between feather and blood for δ~(13)C signatures in Praias-Sado and Vaia suggested that temporal variation of prey availability may be the main factor affecting mercury mobilization into chicks in both those cases, since their water inflow regimes are the same. The lowest levels of δ~(13)C signatures in Vau suggested that water inflow regime may be the main factor in this case, since no discrepancy existed in δ~(13)C signatures between blood and feather.
机译：通过分析碳和氮的稳定同位素比，研究了汞迁移到黑翅高跷Himantopus himantopus雏鸡中的动员原因。在连续繁殖季节中，从沿海盐田小鸡身上采集了血和胸羽。还收集了碎屑样本和潜在的猎物（无脊椎动物）。分别使用原子吸收光谱法和同位素比率质谱法测量了总汞浓度和稳定的同位素特征。 Chironomidae，Cor-ixidae和Hydrophilidae中的汞含量与鸡毛中的汞含量相关。大型无脊椎动物群之间的δ〜（15）N标记差异表明它们属于不同的营养级。无脊椎动物的δ〜（15）N标记与无脊椎动物和雏鸡中的汞含量相关，但与雏鸡的δ〜（15）N标记无关。无脊椎动物中δ〜（15）N标记的组间和位点间差异以及汞含量表明，它们对动员雏鸡中的汞的贡献不同，其相对贡献取决于每个位点的猎物可用性。站点间生物放大系数的差异强化了这一想法。无脊椎动物中的δ〜（13）C特征标志着碳源的范围不仅仅是碎屑。入水方式和猎物可利用性的变化可能导致猎物中δ〜（13）C信号的群间和场所间差异。在Praias-Sado和Vaia中，羽毛和血液中δ〜（13）C标记的差异表明，在这两种情况下，猎物可利用性的时间变化可能是影响汞向小鸡动员的主要因素，因为它们的水流入方式相同。 Vau中最低的δ〜（13）C签名水平表明，在这种情况下，水流入方式可能是主要因素，因为血液和羽毛之间的δ〜（13）C签名不存在差异。

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