A STOICHIOMETRIC ANALYSIS OF THE ZOOPLANKTON-PHYTOPLANKTON INTERACTION IN MARINE AND FRESH-WATER ECOSYSTEMS
A STOICHIOMETRIC ANALYSIS OF THE ZOOPLANKTON-PHYTOPLANKTON INTERACTION IN MARINE AND FRESH-WATER ECOSYSTEMS
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DOI：
10.1038/370211a0
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发表时间：
1994-07-21
期刊：
影响因子：
64.8
通讯作者：
HASSETT, RP
中科院分区：
文献类型：
--
作者：
ELSER, JJ;HASSETT, RP
自a.c.雷德菲尔德发表经典论文(1)以来的35年里，元素比例的应用在海洋和淡水浮游植物研究中得到了广泛应用（2,3）。但直到最近才在其他地方的远洋生态系统，如生产者-消费者界面，研究营养比例（4,5）。在这里，我们报告了第一项研究的结果，据我们所知，在湖泊和海洋栖息地中上层海洋生产者和消费者（浮游植物和浮游动物）的N:P比率。湖泊浮游植物N:P比值高于海洋；海洋浮游动物的氮磷比高于淡水浮游动物。湖泊浮游植物-浮游动物相互作用（N: p -食物-N: p -消费者）的元素失衡为正失衡，超过了海洋样地的负失衡；因此，缺磷食物可能会限制湖泊浮游动物的生长，而不是海洋。化学计量学计算(6)表明，湖泊中消费者驱动的养分循环比率可能比海洋系统高4-6倍。与这种差异一致的是，浮游植物对磷的限制在湖泊中比在海洋中更为普遍。因此，淡水和海洋生态系统中浮游动物-浮游植物相互作用的生态化学计量学性质不同。
IN the 35 years since A. C. Redfield's classic paper(1), the use of elemental ratios has become widespread in marine and freshwater phytoplankton studies(2,3). But nutrient ratios have only recently been studied elsewhere in pelagic ecosystems, such as the producer-consumer interface(4,5). Here we report the results of the first study, to our knowledge, of N:P ratios in pelagic producers and consumers (phytoplankton and zooplankton) in lacustrine and marine habitats. The N:P ratio of phytoplankton was higher in lakes than in marine sites; however, N:P ratios were higher in marine zooplankton than in freshwater zooplankton. The elemental imbalance of the phytoplankton-zooplankton interaction (N:P-food-N:P-consumers) in lakes was positive and exceeded the negative imbalance in marine sites; thus P-deficient food may limit zooplankton growth in lakes but not in oceans. Stoichiometric calculations(6) indicated that consumer-driven nutrient recycling ratios in lakes may be 4-6 times higher than in marine systems. Consistent with this difference, phytoplankton P-limitation was more prevalent in lakes than in marine sites. Thus, the ecological stoichiometry of the zooplankton-phytoplankton interaction differs qualitatively in freshwater and marine ecosystems.