Fewer blue lakes and more murky lakes across the continental U.S.: Implications for planktonic food webs
Fewer blue lakes and more murky lakes across the continental U.S.: Implications for planktonic food webs
复制标题
美国大陆的蓝色湖泊越来越少，浑浊的湖泊越来越多：对浮游食物网的影响
DOI：
10.1002/lno.10967
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发表时间：
2018
影响因子：
4.5
通讯作者：
S. Hampton
中科院分区：
文献类型：
--
作者：
D. Leech;A. Pollard;S. Labou;S. Hampton
越来越多的人认识到，有机物质外来输入的增加是湖泊生态系统变化的驱动因素，特别是在与富营养化同时发生时。以营养物-颜色范式（即基于总磷和真色）对湖泊进行评估，可为研究和管理提供更可靠的方法。为了评估美国湖泊营养色彩状况的时空格局和相关的食物网属性，我们分析了美国环境保护署的国家湖泊评估（NLA）数据。在2007年和2012年的分层随机抽样设计中，NLA对1000多个湖泊进行了采样，对美国大陆的湖泊状况进行了严格的评估。我们证明，许多美国湖泊同时经历了富营养化和褐化，从而产生了大量的“浑浊”湖泊。总体而言，“蓝色”湖泊减少了约18%（从2007年的46%到2012年的28%），而“浑浊”湖泊增加了近12%（从2007年的24%到2012年的35.4%）。“绿色”和“棕色”湖泊的比例没有统计学差异。从区域上看，阿巴拉契亚北部、南部平原和干旱地区的浑浊湖泊显著增加。浑浊湖泊表现出最高的叶绿素a浓度、蓝藻密度和微囊藻毒素浓度。浑浊湖泊的浮游动物总生物量最高，主要是由于轮虫和桡足类生物量增加。然而，浮游动物和浮游植物的生物量比较低，表明向更高营养水平的能量转移减少。这些结果强调，美国的许多湖泊同时“变绿”和“褐变”，对水质和食物网结构有潜在的负面影响。
Elevated allochthonous inputs of organic matter are increasingly recognized as a driver of ecosystem change in lakes, particularly when concurrent with eutrophication. Evaluation of lakes in a nutrient‐color paradigm (i.e., based on total phosphorus and true color) enables a more robust approach to research and management. To assess temporal and spatial patterns in nutrient‐color status for U.S. lakes and associated food web attributes, we analyzed the U.S. Environmental Protection Agency's National Lakes Assessment (NLA) data. With 1000+ lakes sampled in 2007 and 2012 in a stratified random sampling design, the NLA enables rigorous assessment of lake condition across the continental U.S. We demonstrate that many U.S. lakes are simultaneously experiencing eutrophication and brownification to produce an abundance of “murky” lakes. Overall, “blue” lakes decreased by ~ 18% (46% of lakes in 2007 to 28% in 2012) while “murky” lakes increased by almost 12% (24% of lakes in 2007 to 35.4% in 2012). No statistical differences were observed in the proportions of “green” or “brown” lakes. Regionally, murky lakes significantly increased in the Northern Appalachian, Southern Plains, and Xeric ecoregions. Murky lakes exhibited the highest epilimnetic chlorophyll a concentrations, cyanobacterial densities, and microcystin concentrations. Total zooplankton biomass was also highest in murky lakes, primarily due to increased rotifer and copepod biomass. However, zooplankton : phytoplankton biomass ratios were low, suggesting reduced energy transfer to higher trophic levels. These results emphasize that many lakes in the U.S. are simultaneously “greening” and “browning”, with potentially negative consequences for water quality and food web structure.
影响因子：
3.7
作者：
Fergus CE;Finley AO;Soranno PA;Wagner T
通讯作者：
Wagner T
影响因子：
6.6
作者：
Heisler J;Glibert P;Burkholder J;Anderson D;Cochlan W;Dennison W;Gobler C;Dortch Q;Heil C;Humphries E;Lewitus A;Magnien R;Marshall H;Sellner K;Stockwell D;Stoecker D;Suddleson M
通讯作者：
Suddleson M