Terrestrial support of lake food webs: Synthesis reveals controls over cross-ecosystem resource use.
Terrestrial support of lake food webs: Synthesis reveals controls over cross-ecosystem resource use.
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DOI：
10.1126/sciadv.1601765
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发表时间：
2017-03
期刊：
影响因子：
13.6
通讯作者：
Pace ML
中科院分区：
文献类型：
--
作者：
Tanentzap AJ;Kielstra BW;Wilkinson GM;Berggren M;Craig N;Del Giorgio PA;Grey J;Gunn JM;Jones SE;Karlsson J;Solomon CT;Pace ML
有广泛的证据表明，水生消费者利用陆地资源取决于周围集水区的特点。广泛的证据表明，有机物从陆地输出到水生生态系统支持接收食物网仍然存在争议。一个紧迫的问题不仅是高地支持是否可能，而且是在什么一般条件下，它出现。我们收集了迄今为止最大的数据集，湖泊浮游动物的同位素组成（δ2H，δ13C和δ15N）及其相关食物网基础上的资源。总的来说，我们的数据集涵盖了从北方到亚热带的147个湖泊的559个观测结果。通过预测陆地资源的支持内湖和集水区的特点，我们发现，一半的所有消费者的意见，也就是说，中位数是由至少42%的陆地来源的材料。一般来说，陆地浮游动物的支持是最大的湖泊与大的物理和水文连接集水区，丰富的地上和地下有机物。然而，一些消费者对湖内产量提高的陆地资源的反应不那么强烈。我们的研究表明，多种机制驱动广泛的跨生态系统支持的水生消费者在北方湖泊，并表明陆地景观的变化将影响生态系统过程远远超出其边界。
There is widespread evidence that aquatic consumers use terrestrial resources depending on the features of surrounding catchments. Widespread evidence that organic matter exported from terrestrial into aquatic ecosystems supports recipient food webs remains controversial. A pressing question is not only whether high terrestrial support is possible but also what the general conditions are under which it arises. We assemble the largest data set, to date, of the isotopic composition (δ2H, δ13C, and δ15N) of lake zooplankton and the resources at the base of their associated food webs. In total, our data set spans 559 observations across 147 lakes from the boreal to subtropics. By predicting terrestrial resource support from within-lake and catchment-level characteristics, we found that half of all consumer observations that is, the median were composed of at least 42% terrestrially derived material. In general, terrestrial support of zooplankton was greatest in lakes with large physical and hydrological connections to catchments that were rich in aboveground and belowground organic matter. However, some consumers responded less strongly to terrestrial resources where within-lake production was elevated. Our study shows that multiple mechanisms drive widespread cross-ecosystem support of aquatic consumers across Northern Hemisphere lakes and suggests that changes in terrestrial landscapes will influence ecosystem processes well beyond their boundaries.