Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jaridenv.2006.10.016 |
Discriminating direct and indirect effects of exotic grazers on native plant cover in the Monte desert of Argentina | |
Tadey, M.; Farji-Brener, A. G. | |
通讯作者 | Farji-Brener, A. G. |
来源期刊 | JOURNAL OF ARID ENVIRONMENTS
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ISSN | 0140-1963 |
EISSN | 1095-922X |
出版年 | 2007 |
卷号 | 69期号:3页码:526-536 |
英文摘要 | The relationship between exotic mammalian herbivores (EMH) and the native vegetation has often been focused on direct effects and viewed it as binary interactions. However, in arid environments indirect effects and the community context may also influence the effect of EMH on plants. We sampled the flora and soil nutrients (SN) in seven paddocks that differed in stocking rates, and used structural equation modeling (SEM) to partition the net effect of EMH into direct and indirect effects on the most abundant plant species of the Monte desert of Argentina. We proposed two indirect effects by which EMH can modify the cover of a focal plant species: the modification of the assemblage plant cover (APC) and alteration of SN. Indirect effects appear to be as important as direct ones. EMH did not affect the status of SN; thus indirect effects through this pathway were irrelevant. Conversely, EMH always affected the APC negatively, but the effect of APC on a focal plant varied according to their identity. Therefore, indirect effects through the APC were positive or negative depending on plant species. Several possible mechanisms explaining how changes in the cover of nearby plants can alter the cover of a focal plant species are discussed. These results emphasize the importance of indirect interactions to explain the complex relationship between EMH and native plant cover in arid ecosystems. (c) 2006 Elsevier Ltd. All rights reserved. |
英文关键词 | indirect interactions livestock structural equation models Patagonia |
类型 | Article |
语种 | 英语 |
国家 | Argentina |
收录类别 | SCI-E |
WOS记录号 | WOS:000245349300013 |
WOS关键词 | COMMUNITIES ; DYNAMICS ; HERBIVORES ; NUTRIENT ; SELECTIVITY ; COMPETITION ; VEGETATION ; RANGELANDS ; GRADIENTS ; ABUNDANCE |
WOS类目 | Ecology ; Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/154777 |
作者单位 | (1)Univ Nacl Comahue, CRUB, Lab Ecotono, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina |
推荐引用方式 GB/T 7714 | Tadey, M.,Farji-Brener, A. G.. Discriminating direct and indirect effects of exotic grazers on native plant cover in the Monte desert of Argentina[J],2007,69(3):526-536. |
APA | Tadey, M.,&Farji-Brener, A. G..(2007).Discriminating direct and indirect effects of exotic grazers on native plant cover in the Monte desert of Argentina.JOURNAL OF ARID ENVIRONMENTS,69(3),526-536. |
MLA | Tadey, M.,et al."Discriminating direct and indirect effects of exotic grazers on native plant cover in the Monte desert of Argentina".JOURNAL OF ARID ENVIRONMENTS 69.3(2007):526-536. |
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