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Incidental Oligotrophication of North American Great Lakes

机译：北美五大湖的附带营养缺陷

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摘要

Phytoplankton production is an important factor in determining both ecosystem stability and the provision of ecosystem goods and services. The expansive and economically important North American Great Lakes are subjected to multiple stressors and understanding their responses to those stresses is important for understanding system-wide ecological controls. Here we show gradual increases in spring silica concentration (an indicator of decreasing growth of the dominant diatoms) in all basins of Lakes Michigan and Huron (USA and Canadian waters) between 1983 and 2008. These changes indicate the lakes have undergone gradual oligotrophication coincident with and anticipated by nutrient management implementation. Slow declines in seasonal drawdown of silica (proxy for seasonal phytoplankton production) also occurred, until recent years, when lake-wide responses were punctuated by abrupt decreases, putting them in the range of oligotrophic Lake Superior. The timing of these dramatic production drops is coincident with expansion or populations or invasive dreissemd mussels, particularly quagga mussels, in each basm. The combmed effect of nutrient mitigation and invasive species expansion demonstrates the challenges facing large-scale ecosystems and suggest the need for new management regimes for large ecosystems.
机译：浮游植物的生产是决定生态系统稳定性以及生态系统产品和服务提供的重要因素。北美五大湖具有广泛的经济意义，因此要承受多种压力，因此了解它们对这些压力的反应对于了解整个系统的生态控制至关重要。在这里，我们显示了1983年至2008年之间密歇根湖和休伦湖（美国和加拿大水域）的所有盆地中春季二氧化硅浓度的逐渐增加（一种指示性硅藻生长减少的指标）。并由养分管理实施预期。二氧化硅的季节性回落（用于季节性浮游植物生产的替代物）也缓慢下降，直到最近几年，整个湖泊的响应因突然的下降而中断，使其处于贫营养的苏必利尔湖范围。这些急剧的产量下降的时机与每种基底中的扩张或种群或侵入性淡淡贻贝，特别是夸加贻贝相吻合。养分缓解和入侵物种扩展的综合效果证明了大型生态系统面临的挑战，并表明需要针对大型生态系统的新管理制度。

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  • 来源
    《Environmental Science & Technology》 |2011年第8期|p.3297-3303|共7页
  • 作者

    Mary Anne Evans; Gary Fahnenstiel; Donald Scavia;

  • 作者单位

    SchooI of Natural Resources and Environment, University of Michigan, 440 Church St., Ann Arbor, Michigan 48109, United States;

    Lake Michigan Field Station, Great Lakes Environmental Research Laboratory, NOAA, 1431 Beach St. Muskegon, Michigan 49441,United States,Department of Biology, Hope College, Holland, Michigan 49423, United States;

    SchooI of Natural Resources and Environment, University of Michigan, 440 Church St., Ann Arbor, Michigan 48109, United States,"Graham Environmental Sustainability Institute, University of Michigan, Ann Arbor, Michigan 48109, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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