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Do freshwater mussel shells record road-salt pollution?

机译：淡水贻贝壳会记录道路盐污染吗？

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Road-salt pollution in streams in the Northeastern United States has become a major concern, but historical data are scarce. Freshwater bivalve shells have the ability to record past environmental information, and may act as archives of road-salt pollution. We sampled Elliptio complanata shells from four streams, as well as specimens collected in 1877. Average [Na/Ca]shell was highest in modern shells from the stream with the highest sodium concentrations, and low in shells collected from this same stream in 1877 as well as in the shells from other streams, suggesting that [Na/Ca]shell serves as a proxy for road-salt pollution. We expected higher [Na/Ca]shell in winter and spring. However, high-resolution [Na/Ca]shell analyses along the growth axis of one shell did not reveal any clear subannual patterns, which could be the result of shell growth cessation in winter and/or during periods of high stream sodium concentrations. Therefore, bulk [Na/Ca]shell analysis from multiple shells can be used as a proxy of large changes in stream sodium concentrations, but high-resolution variations in stream sodium concentrations do not seem to be recorded in the shells.
机译：美国东北部河流中的道路盐污染已成为主要问题，但历史数据很少。淡水双壳贝壳有能力记录过去的环境信息，并可以作为道路盐污染的档案。我们从4条溪流中采集了Elliptio complanata贝壳，并在1877年采集了标本。平均[Na / Ca]贝壳在含钠浓度最高的溪流中的现代贝壳中最高，而在1877年从同一溪流中采集的贝壳中钠含量较低。以及来自其他河流的贝壳中，表明[Na / Ca]贝壳可作为道路盐污染的替代物。我们预计冬季和春季的[Na / Ca]壳数会更高。但是，沿一个壳的生长轴进行的高分辨率[Na / Ca]壳分析未揭示任何清晰的年年模式，这可能是冬天和/或高钠浓度期间壳停止生长的结果。因此，来自多个壳的大量[Na / Ca]壳分析可以用作流态钠浓度大变化的替代，但是在壳中似乎没有记录到流态钠浓度的高分辨率变化。

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