Resilience of phytoplankton dynamics to trophic cascades and nutrient enrichment

Resilience of phytoplankton dynamics to trophic cascades and nutrient enrichment
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浮游植物动态对营养级联和营养富集的恢复力

DOI:
10.1002/lno.11913
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发表时间:
2021
影响因子:
4.5
通讯作者:
Pace, Michael L.
Pace, Michael L.
中科院分区:
地球科学1区
文献类型:
--
作者:
Carpenter, Stephen R.;Arani, Babak M. S.;Van Nes, Egbert H.;Scheffer, Marten;Pace, Michael L.

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在两个多年期全湖实验中,比较了浮游植物色素浓度交替状态的恢复力,这些实验旨在将操作的生态系统在交替状态之间转换。平均离开时间,阈值交叉之间的平均时间,在夏季分层期间每5分钟自动测量计算。交替状态被清楚地确定,和平衡显示狭窄的变化,在自助分析的不确定性。平均退出时间范围为13至290 h。在参考生态系统Paul Lake中,低色素状态的平均退出时间比高色素状态的平均退出时间长约100小时。在操作的生态系统中,彼得湖,在级联实验中,高色素状态的平均退出时间超过低色素状态30小时。在富集实验中,低色素状态的平均离开时间比高色素状态的平均离开时间长约100小时。平均退出时间是随机生态系统恢复力的一个有用度量,在随机生态系统中,高频测量是在整个生态系统状态范围内通过一致的方法进行的。
Resilience was compared for alternate states of phytoplankton pigment concentration in two multiyear whole‐lake experiments designed to shift the manipulated ecosystem between alternate states. Mean exit time, the average time between threshold crossings, was calculated from automated measurements every 5 min during summer stratification. Alternate states were clearly identified, and equilibria showed narrow variation in bootstrap analysis of uncertainty. Mean exit times ranged from 13 to 290 h. In the reference ecosystem, Paul Lake, mean exit time of the low‐pigment state was about 100 h longer than mean exit time of the high‐pigment state. In the manipulated ecosystem, Peter Lake, mean exit time of the high‐pigment state exceeded that of the low‐pigment state by 30 h in the cascade experiment. In the enrichment experiment mean exit time of the low‐pigment state was longer than that of the high‐pigment state by about 100 h. Mean exit time is a useful measure of resilience for stochastic ecosystems where high‐frequency measurements are made by consistent methods over the full range of ecosystem states.
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DOI: --
发表时间: 2019
影响因子: 27.6
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