Habitat, not resource availability, limits consumer production in lake ecosystems
Habitat, not resource availability, limits consumer production in lake ecosystems
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DOI：
10.1002/lno.10153
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发表时间：
2015-11-01
影响因子：
4.5
通讯作者：
Solomon, Christopher T.
中科院分区：
文献类型：
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作者：
Craig, Nicola;Jones, Stuart E.;Solomon, Christopher T.
湖泊中的食物网生产力可能受到溶解有机碳（DOC）的限制，这通过限制底栖动物猎物的丰度来减少鱼类产量。我们证明，在一组10个小的，北温带湖泊跨越广泛的DOC梯度，这些高DOC浓度对底栖动物生产的负面影响主要是由温暖的，良好的充氧栖息地的可用性，而不是光限制底栖动物的初级生产如前所述。有没有显着的影响，底栖动物生产控制后的氧气，即使稳定同位素分析表明，底栖动物利用这种资源的初级生产。平均全湖底栖动物生产较低的高DOC湖泊的含氧栖息地的可用性降低，是鱼类生物量。这些见解提高了湖泊食物网的理解，并告知管理面临的空间变异性和持续的时间变化湖泊DOC浓度。
Food web productivity in lakes can be limited by dissolved organic carbon (DOC), which reduces fish production by limiting the abundance of their zoobenthic prey. We demonstrate that in a set of 10 small, north temperate lakes spanning a wide DOC gradient, these negative effects of high DOC concentrations on zoobenthos production are driven primarily by availability of warm, well-oxygenated habitat, rather than by light limitation of benthic primary production as previously proposed. There was no significant effect of benthic primary production on zoobenthos production after controlling for oxygen, even though stable isotope analysis indicated that zoobenthos do use this resource. Mean whole-lake zoobenthos production was lower in high-DOC lakes with reduced availability of oxygenated habitat, as was fish biomass. These insights improve understanding of lake food webs and inform management in the face of spatial variability and ongoing temporal change in lake DOC concentrations.