Producer-decomposer co-dependency influences biodiversity effects

被引:182
作者
Naeem, S [1 ]
Hahn, DR [1 ]
Schuurman, G [1 ]
机构
[1] Univ Washington, Dept Zool, Seattle, WA 98195 USA
关键词
D O I
10.1038/35001568
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Producers, such as plants and algae, acquire nutrients from inorganic sources that are supplied primarily by decomposers whereas decomposers, mostly fungi and bacteria, acquire carbon from organic sources that are supplied primarily by producers. This producer-decomposer co-dependency is important in governing ecosystem processes(1-4), which implies that the impacts of declining biodiversity on ecosystem functioning(5-7) should be strongly infuenced by this process. Here we show, by simultaneously manipulating producer (green algal) and decomposer (heterotrophic bacterial) diversity in freshwater microcosms, that algal biomass production varies considerably among microcosms (0.0-0.67 mg ml(-1)), but that neither algal nor bacterial diversity by itself can explain this variation. Instead, production is a joint function of both algal and bacterial diversity. Furthermore, the range in algal production in microscosms in which bacterial diversity was manipulated was nearly double (1.82 times) that of microcosms in which bacterial diversity was not manipulated. Measures of organic carbon use by bacteria in these microcosms indicate that carbon usage is the mechanism responsible for these results. Because both producer(8) and microbial diversity(9) respond to disturbance and habitat modification, the main causes of biodiversity loss(8), these results suggest that ecosystem response to changing biodiversity is likely to be more complex than other studies(5-7) have shown.
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页码:762 / 764
页数:3
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