气候变化领域集成服务门户(CCPortal): Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation

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DOI	10.1073/pnas.0711411105
	Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation
	Menge D.N.L.; Levin S.A.; Hedin L.O.
发表日期	2008
ISSN	0027-8424
起始页码	1573
结束页码	1578
卷号	105 期号:5
英文摘要	Symbiotic nitrogen (N) fixing trees are absent from old-growth temperate and boreal ecosystems, even though many of these are N-limited. To explore mechanisms that could select against N fixation in N-limited, old-growth ecosystems, we developed a simple resource-based evolutionary model of N fixation. When there are no costs of N fixation, increasing amounts of N fixation will be selected for until N no longer limits production. However, tradeoffs between N fixation and plant mortality or turnover, plant uptake of available soil N, or N use efficiency (NUE) can select against N fixation in N-limited ecosystems and can thereby maintain N limitation indefinitely (provided that there are losses of plant-unavailable N). Three key traits influence the threshold that determines how large these tradeoffs must be to select against N fixation. A low NUE, high mortality (or turnover) rate and low losses of plant-unavailable N all increase the likelihood that N fixation will be selected against, and a preliminary examination of published data on these parameters shows that these mechanisms, particularly the tradeoff with NUE, are quite feasible in some systems. Although these results are promising, a better characterization of these parameters in multiple ecosystems is necessary to determine whether these mechanisms explain the lack of symbiotic N fixers - and thus the maintenance of N limitation - in old-growth forests. © 2008 by The National Academy of Sciences of the USA.
英文关键词	Evolutionary ecology; Model
语种	英语
scopus关键词	article; ecology; ecosystem; evolution; model; nitrogen fixation; plant metabolism; priority journal; biological model; ecosystem; genetic selection; genetics; metabolism; tree; nitrogen; Ecosystem; Evolution; Models, Biological; Nitrogen; Nitrogen Fixation; Selection (Genetics); Trees
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159176
作者单位	Menge, D.N.L., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Levin, S.A., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Hedin, L.O., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Menge D.N.L.,Levin S.A.,Hedin L.O.. Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation[J],2008,105(5).
APA	Menge D.N.L.,Levin S.A.,&Hedin L.O..(2008).Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation.Proceedings of the National Academy of Sciences of the United States of America,105(5).
MLA	Menge D.N.L.,et al."Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation".Proceedings of the National Academy of Sciences of the United States of America 105.5(2008).