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首页> 外文期刊>The Science of the Total Environment >Mercury bioaccumulation in temperate forest food webs associated with headwater streams
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Mercury bioaccumulation in temperate forest food webs associated with headwater streams

机译：温带森林食品网的汞生物累积与下线流相关的

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The soils and food webs associated with mid to high elevation, forested, headwater streams in northeastern North America are potential hotspots for mercury (Hg) methylation and bioaccumulation, but are not well studied. Our goals were to quantify total Hg (THg) and methyl Hg (MeHg) concentrations in soils and terrestrial food webs associated with headwater streams of northern hardwood forests to identify predictors of small-scale spatial variation in Hg bioaccumulation. We sampled soil characteristics that promote Hg methylation including pH, sulfur and calcium content, and organic matter. To assess spatial variation, we sampled at high (similar to 700 m asl) and mid elevations (similar to 500 m asl), both adjacent to (1 m) and away from (75 m) three replicate headwater streams in each of two watersheds of the White Mountains region, New Hampshire, USA. Soils of these forested watersheds differed significantly in pH and the content of calcium, sulfur, organic matter and THg. Conditions for methylation were more favorable in the upland forest sites compared to streamside sites. Significant bioaccumulation of THg occurred in all measured components of the food web, including insects, spiders, salamanders, and birds. Trophic position, as determined by delta N-15, was the best predictor of both THg and MeHg bioaccumulation across the sampled taxa and was also a better predictor than spatial location. However, the degree of bioaccumulation at which MeHg significantly affects animal behavior, reproduction or survival is unknown for most taxa in terrestrial habitats, particularly for invertebrates. These findings show that Hg methylation and bioaccumulation is not limited to areas traditionally classified as wetlands or to areas with exceptionally high THg inputs, but that it is a widespread and important phenomenon in the moist deciduous forests of eastern North America. (c) 2019 Elsevier B.V. All rights reserved.
机译：与北美东北部高度高海拔相关的土壤和食品网是森林，森林，下水流，是汞（Hg）甲基化和生物累积的潜在热点，但没有很好地研究。我们的目标是量化与北硬木森林的下水流相关的土壤和陆地食物网中的总Hg（THG）和甲基Hg（MeHG）浓度，以识别Hg生物累积的小规模空间变化的预测因子。我们采样的土壤特性，促进甲基化，包括pH，硫和钙含量和有机物质。为了评估空间变化，我们在高（类似于700米ASL）和中升高（类似于500米ASL），两者（<1米）和远离（> 75米）三个复制下水流白色山区地区的两个流域，新罕布什尔，美国。这些森林流域的土壤在pH和钙，硫，有机物质和THG的含量显着显着不同。与流烟囱位点相比，甲基化的条件更有利。在食品网的所有测量组分中发生显着的BG生物累积，包括昆虫，蜘蛛，蝾螈和鸟类。由Delta N-15确定的营养位置是在采样的分类群中的THG和MEHG生物累积的最佳预测因子，而且也比空间位置更好地预测。然而，Mehg在陆地栖息地的大多数分类群中，莫尔格显着影响动物行为，繁殖或存活的程度是未知的，特别是对于无脊椎动物而言。这些发现表明，HG甲基化和生物累积不仅限于传统上归类为湿地的区域或具有异常高THG投入的地区，但它在北美东部潮湿的落叶林中是一种广泛和重要的现象。 （c）2019 Elsevier B.v.保留所有权利。

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