Climate change forces new ecological states in tropical Andean lakes.
Climate change forces new ecological states in tropical Andean lakes.
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DOI：
10.1371/journal.pone.0115338
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Smol JP
中科院分区：
文献类型：
--
作者：
Michelutti N;Wolfe AP;Cooke CA;Hobbs WO;Vuille M;Smol JP
近几十年来，相对于全球平均水平，热带安第斯山脉的气温上升速度加快。然而，气候变化对安第斯湖泊的影响在很大程度上仍不为人所知，而这些湖泊对维持区域生物多样性至关重要，是当地居民的重要水资源。在这里，我们表明，最近的气候变化迫使高山湖泊的赤道安第斯山脉走向新的生态和物理状态，在区域冰川的快速萎缩密切同步。使用过时的沉积物岩心从三个湖泊在南部的厄瓜多尔山脉，我们记录突然增加的浮游植物中的微量丰度的优势，在浮游植物中的海洋thalassiosiroid硅藻Discostella stelligera。这种前所未有的转变是在气温上升、大气压力场变化和风速下降的背景下发生的。这些湖泊的生态重建与变暖和/或水柱分层增强有关。与季节性冰雪覆盖的北极和温带高山地区相比，水产生产并没有随着变暖而普遍增加，在一些湖泊中甚至有所下降，这可能是因为热稳定性的增强阻碍了地下水营养物质向地表沃茨的再循环。我们的研究结果表明，这些湖泊已经超过了重要的生态阈值，可能对安第斯水资源产生深远的影响。
Air temperatures in the tropical Andes have risen at an accelerated rate relative to the global average over recent decades. However, the effects of climate change on Andean lakes, which are vital to sustaining regional biodiversity and serve as an important water resource to local populations, remain largely unknown. Here, we show that recent climate changes have forced alpine lakes of the equatorial Andes towards new ecological and physical states, in close synchrony to the rapid shrinkage of glaciers regionally. Using dated sediment cores from three lakes in the southern Sierra of Ecuador, we record abrupt increases in the planktonic thalassiosiroid diatom Discostella stelligera from trace abundances to dominance within the phytoplankton. This unprecedented shift occurs against the backdrop of rising temperatures, changing atmospheric pressure fields, and declining wind speeds. Ecological restructuring in these lakes is linked to warming and/or enhanced water column stratification. In contrast to seasonally ice-covered Arctic and temperate alpine counterparts, aquatic production has not increased universally with warming, and has even declined in some lakes, possibly because enhanced thermal stability impedes the re-circulation of hypolimnetic nutrients to surface waters. Our results demonstrate that these lakes have already passed important ecological thresholds, with potentially far-reaching consequences for Andean water resources.
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影响因子：
5.2
作者：
Rabatel, A.;Francou, B.;Wagnon, P.
通讯作者：
Wagnon, P.
影响因子：
2.3
作者：
Bush, MB;Hansen, BCS;Gosling, WD
通讯作者：
Gosling, WD
DOI：
10.1073/pnas.1003719108
发表时间：
2011-05-24
影响因子：
11.1
作者：
Bird, Broxton W.;Abbott, Mark B.;Rosenmeier, Michael F.
通讯作者：
Rosenmeier, Michael F.
影响因子：
1.7
作者：
Gunkel, G;Casallas, J
通讯作者：
Casallas, J
影响因子：
2.3
作者：
Niemann, Holger;Behling, Hermann
通讯作者：
Behling, Hermann