DOC , grazers, and resilience of phytoplankton to enrichment
DOC , grazers, and resilience of phytoplankton to enrichment
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DOC、食草动物和浮游植物对富集的恢复力
DOI：
10.1002/lol2.10280
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发表时间：
2022
影响因子：
7.8
通讯作者：
Wilkinson, Grace M.
中科院分区：
文献类型：
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作者：
Carpenter, Stephen R.;Pace, Michael L.;Wilkinson, Grace M.
浮游植物的大量繁殖通常伴随着营养物质的富集。湖泊之间吸收光的溶解有机碳（DOC）的差异可能会将水华阈值转移到更高的养分负荷，从而提高湖泊对富集的恢复能力。为了探索这个想法，我们测量了两个具有对比 DOC 浓度的湖泊的实验富集恢复能力。我们使用浮游植物对 DOC 和营养物质的响应模型、弹性的动态时间序列指标以及随机弹性的两种经验测量（平均退出时间和中位生存时间）来比较两个湖泊的水华阈值。对于动态指标和生态系统模型来说，DOC 较高的湖泊对富集的恢复能力更强。然而，两个湖泊恢复力的随机指标的分布重叠。这些分析表明，DOC 与混合深度和浮游动物生物量相互作用，影响恢复力。需要 DOC 和许多观察结果的强烈对比来辨别 DOC 对浓缩恢复能力的影响。
Phytoplankton blooms often follow nutrient enrichment. Differences among lakes in light‐absorbing dissolved organic carbon (DOC) may shift bloom thresholds to higher nutrient loads and thereby increase resilience of lakes to enrichment. To explore this idea, we measured resilience to experimental enrichment of two lakes with contrasting DOC concentrations. We compared bloom thresholds in both lakes using a model of phytoplankton response to DOC and nutrients, a dynamic time series indicator of resilience, and two empirical measures of stochastic resilience, mean exit time and median survival time. For the dynamic indicator and ecosystem model the lake with higher DOC was more resilient to enrichment. However, the distributions overlapped for stochastic indicators of resilience of the two lakes. These analyses show that DOC interacts with mixing depth and zooplankton biomass to affect resilience. Strong contrasts in DOC and many observations are needed to discern effects of DOC on resilience to enrichment.