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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Strong evidence for terrestrial support of zooplankton in small lakes based on stable isotopes of carbon, nitrogen, and hydrogen
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Strong evidence for terrestrial support of zooplankton in small lakes based on stable isotopes of carbon, nitrogen, and hydrogen

机译：基于稳定的碳，氮和氢同位素，有力地证明了小湖泊中浮游生物的陆地支持

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摘要

Cross-ecosystem subsidies to food webs can alter metabolic balances in the receiving (subsidized) system and free the food web, or particular consumers, from the energetic constraints of local primary production. Although cross-ecosystem subsidies between terrestrial and aquatic systems have been well recognized for benthic organisms in streams, rivers, and the littoral zones of lakes, terrestrial subsidies to pelagic consumers are more difficult to demonstrate and remain controversial. Here, we adopt a unique approach by using stable isotopes of H, C, and N to estimate terrestrial support to zooplankton in two contrasting lakes. Zooplankton {Holopedium, Daphnia, and Leptodiaptomus) are comprised of≈20-40% of organic material of terrestrial origin. These estimates are as high as, or higher than, prior measures obtained by experimentally manipulating the inorganic ~13C content of these lakes to augment the small, natural contrast in ~13C between terrestrial and algal photosynthesis. Our study gives credence to a growing literature, which we review here, suggesting that significant terrestrial support of pelagic crustaceans (zooplankton) is widespread.
机译：对食物网的跨生态系统补贴可以改变接收（补贴）系统中的新陈代谢平衡，并使食物网或特定的消费者摆脱本地初级生产的积极约束。尽管对于溪流，河流和湖泊沿岸带的底栖生物，陆生和水生系统之间的跨生态系统补贴已广为人知，但对中上层消费者的陆生补贴更加难以证明，并且仍然存在争议。在这里，我们采用一种独特的方法，即使用H，C和N的稳定同位素来估算两个相反湖泊中对浮游动物的陆地支持。浮游动物（Ho足类，水蚤和Leptodiaptomus）由约20-40％的陆生有机物质组成。这些估算值与通过实验操作这些湖泊的无机〜13 C含量以增强陆地和藻类光合作用的〜13 C中小的自然反差而获得的先前方法一样高，甚至更高。我们的研究为越来越多的文献提供了证明，在这里我们进行了评论，这表明上层甲壳类动物（陆生浮游动物）在陆地上的重要支持得到广泛传播。

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