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首页> 外文期刊>Journal of great lakes research >Biomonitoring using invasive species in a large Lake: Dreissena distribution maps hypoxic zones
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Biomonitoring using invasive species in a large Lake: Dreissena distribution maps hypoxic zones

机译：在大湖中使用入侵物种进行生物监测：Dreissena分布图可测低氧区

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Due to cultural eutrophication and global climate change, an exponential increase in the number and extent of hypoxic zones in marine and freshwater ecosystems has been observed in the last few decades. Hypoxia, or low dissolved oxygen (DO) concentrations, can produce strong negative ecological impacts and, therefore, is a management concern. We measured biomass and densities of Dreissena in Lake Erie, as well as bottom DO in 2014 using 19 high frequency data loggers distributed throughout the central basin to validate a three-dimensional hydrodynamic-ecological lake model. We found that a deep, offshore hypoxic zone was formed by early August, restricting the Dreissena population to shallow areas of the central basin. Deeper than 20 m, where bottom hypoxia routinely develops, only young of the year mussels were found in small numbers, indicating restricted recruitment and survival of young Dreissena. We suggest that monitoring Dreissena distribution can be an effective tool for mapping the extent and frequency of hypoxia in freshwater. In addition, our results suggest that an anticipated decrease in the spatial extent of hypoxia resulting from nutrient management has the potential to increase the spatial extent of profundal habitat in the central basin available for Dreissena expansion. (C) 2017 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：由于文化的富营养化和全球气候变化，近几十年来，海洋和淡水生态系统中缺氧区的数量和范围呈指数增长。缺氧或低溶解氧（DO）浓度会产生强烈的负面生态影响，因此是管理上的关注点。我们使用分布在整个中部盆地的19个高频数据记录仪测量了伊利湖Dreissena的生物量和密度，以及2014年的底部DO，以验证三维水动力-生态湖模型。我们发现，到8月初形成了一个深海近海缺氧区，将Dreissena种群限制在中部盆地的浅水区。深度超过20 m的地方通常会发生底部缺氧，仅发现少量的一年生贻贝，这表明幼小Dreissena的募集和生存受到限制。我们建议监测Dreissena分布可以作为一种有效的工具，用于绘制淡水中缺氧的程度和频率。此外，我们的结果表明，由养分管理导致的缺氧空间范围的预期减少可能会增加可用于Dreissena扩张的中央盆地深层生境的空间范围。 （C）2017年国际大湖研究协会。由Elsevier B.V.发布。保留所有权利。

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