Effects of seasonal hypoxia on macroinvertebrate communities in a small reservoir

Q3 Environmental Science
David O. Lucchesi, Steven R. Chipps, David A. Schumann
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引用次数: 1

Abstract

Localized hypoxia can reduce available habitat, restrict movement and limit the abundance of aquatic invertebrates. Although cultural eutrophication, coupled with the effects of climate change, is likely to increase the frequency and extent of hypoxia in aquatic ecosystems, little is known about how oxygen gradients in small reservoirs influence spatial distribution and abundance of aquatic invertebrates. The present study evaluated the effects of environmental and biological attributes on seasonal and spatial variation of macroinvertebrates and explored how hypoxic conditions influenced littoral, benthic and pelagic macroinvertebrate communities in Lake Alvin, South Dakota. Data on reservoir conditions, in conjunction with macroinvertebrate sampling from May to October 2009–2011, were applied in an information theoretic approach to evaluate factors affecting invertebrate abundance. Hypoxic conditions were present from May to September in the lacustrine zone impacting 10%–39% of the water column. Benthic invertebrates were typically absent from the lacustrine zone during periods of severe hypoxia and were most abundant in the shallow, well-oxygenated riverine zone. Littoral invertebrates were negatively related to the per cent of the hypoxic water column, suggesting fish, confined to shallow waters by hypoxia, may be consuming a larger portion of littoral invertebrates in their diets. Cladocera and Copepoda densities were influenced primarily by water depth and monthly precipitation. The larger size of Daphnia found in the hypoxic-prone transitional and lacustrine zones suggested low oxygen concentrations may provide a refuge from fish predation. The results of the present study demonstrated spatial variations in near-bottom oxygen concentrations were important predictors of macroinvertebrate and zooplankton abundance and size structure in Lake Alvin and that macroinvertebrates, particularly benthic and littoral invertebrates, could benefit from measures taken to reduce summer hypoxia.

Abstract Image

季节性缺氧对小型水库大型无脊椎动物群落的影响
局部缺氧可以减少可用的栖息地,限制运动和限制水生无脊椎动物的丰度。虽然养殖富营养化,加上气候变化的影响,可能会增加水生生态系统缺氧的频率和程度,但人们对小型水库中的氧气梯度如何影响水生无脊椎动物的空间分布和丰度知之甚少。本研究评估了环境和生物属性对大型无脊椎动物季节和空间变化的影响,探讨了缺氧条件对南达科他州阿尔文湖沿岸、底栖和远洋大型无脊椎动物群落的影响。利用2009-2011年5 - 10月的储层条件数据,结合大型无脊椎动物样本,应用信息论方法评价影响无脊椎动物丰度的因素。5 ~ 9月湖盆区缺氧,影响10% ~ 39%的水柱。底栖无脊椎动物在严重缺氧时期通常不存在于湖带,而在浅而富氧的河带中最为丰富。沿海无脊椎动物与缺氧水柱的百分比呈负相关,这表明由于缺氧而被限制在浅水区的鱼类可能在其饮食中消耗了更大比例的沿海无脊椎动物。枝足类和桡足类的密度主要受水深和月降水量的影响。在易缺氧过渡带和湖相带发现的较大水蚤表明,低氧浓度可能为鱼类捕食提供了避难所。本研究结果表明,近底氧浓度的空间变化是阿尔文湖大型无脊椎动物和浮游动物丰度和大小结构的重要预测因子,大型无脊椎动物,特别是底栖和沿岸无脊椎动物,可以从减少夏季缺氧的措施中受益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Lakes and Reservoirs: Research and Management
Lakes and Reservoirs: Research and Management Environmental Science-Water Science and Technology
CiteScore
2.40
自引率
0.00%
发文量
29
期刊介绍: Lakes & Reservoirs: Research and Management aims to promote environmentally sound management of natural and artificial lakes, consistent with sustainable development policies. This peer-reviewed Journal publishes international research on the management and conservation of lakes and reservoirs to facilitate the international exchange of results.
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