Influence of food web structure on carbon exchange between lakes and the atmosphere
Influence of food web structure on carbon exchange between lakes and the atmosphere
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DOI：
10.1126/science.277.5323.248
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发表时间：
1997-07-11
期刊：
影响因子：
56.9
通讯作者：
Pace, ML
中科院分区：
文献类型：
--
作者：
Schindler, DE;Carpenter, SR;Pace, ML
通过对湖泊上层捕食者和营养物负荷的控制，评价了食物网结构对湖泊与大气间碳通量的影响。养分富集增加了初级生产，使湖泊成为大气碳（C-atm）的净汇。顶级掠食者的变化导致了食草动物的变化。在相同养分负荷下，低放牧区的C-atm入侵量大于高放牧区。碳稳定同位素分布证实了湖泊二氧化碳的减少，并追踪了C-atm从藻类到顶级捕食者的转移，因此，顶级捕食者改变了生态系统的碳固定和与大气的联系。
Top predators and nutrient loading in lakes were manipulated to assess the influence oi food web structure on carbon flux between lakes and the atmosphere. Nutrient enrichment increased primary production, causing lakes to become net sinks for atmospheric carbon (C-atm). Changes in top predators caused shifts in grazers. At identical nutrient loading, C-atm invasion was greater to a lake with low grazing than to one with high grazing. Carbon stable-isotope distributions corroborated the drawdown of lake carbon dioxide and traced C-atm transfer from algae to top predators Thus, top predators altered ecosystem carbon fixation and linkages to the atmosphere.