Arid
DOI10.1111/1365-2664.12775
Functional diversity loss with increasing livestock grazing intensity in drylands: the mechanisms and their consequences depend on the taxa
Chillo, Veronica1,2,3; Ojeda, Ricardo A.1; Capmourteres, Virginia2; Anand, Madhur2
通讯作者Chillo, Veronica
来源期刊JOURNAL OF APPLIED ECOLOGY
ISSN0021-8901
EISSN1365-2664
出版年2017
卷号54期号:3页码:986-996
英文摘要

1. Overgrazing is one of the main drivers of desertification in drylands, and livestock production is expected to increase in the next decades. The analysis of functional diversity can clarify the effects of increasing livestock grazing on ecosystem functioning.


2. We assess the effect of livestock grazing intensity on the relationship between taxonomic diversity (TDH) and functional diversity (FDQ) of plants, ants and small mammals, as well as on within-trait diversity. We compared results using two indices of taxonomic diversity (Shannon and Simpson indices). We used structural equation modelling (SEM) to assess the causal relationship between grazing intensity, TDH, FDQ and decomposition rate for each taxa.


3. Correlation between TDH vs. FDQ varied across assemblages and seasons, but was consistent between different indices of taxonomic diversity. A similar trajectory of TDH vs. FDQ under landuse intensification was found for all taxa, with a correlated loss of species and functional traits. Also, within-trait diversity was negatively affected by increasing grazing pressure. Vegetation and small mammal SEM models show that increasing grazing intensity had a strong and direct effect on decomposition rate. The ant SEM model was the only one that showed an indirect effect of grazing on decomposition through FDQ. TDH had no effect on decomposition for either taxa.


4. We found higher niche differentiation in animal than in plant assemblages. In vegetation, several species seem to have similar trait diversity (i.e. redundancy), perhaps due to a dominant role of environmental constraints. These results were consistent among diversity indices. But increasing disturbance negatively affected TDH vs. FDQ in all assemblages in a similar way. Livestock grazing affected decomposition rate directly, and indirectly only through the effect of ant FDQ.


5. Synthesis and applications. Under increasing grazing intensity, all plant and animal assemblages respond with a mirrored reduction in taxonomic diversity and functional diversity, although vegetation seems to have higher functional redundancy. Our results are robust to diversity indices, and show that several taxa respond similarly to land-use intensification, despite differences in the mechanism behind it. This may facilitate sustainable management. Notably, increasing grazing intensity affects decomposition rate through a stronger direct than indirect effect. The stronger direct effect of livestock on decomposition rate, rather than indirectly through functional diversity, suggests that changes in structure may be more important than changes in community composition.


英文关键词ants arid rangeland management decomposition rate drylands functional effect traits functional redundancy Monte desert overgrazing small mammals vegetation
类型Article
语种英语
国家Argentina ; Canada
收录类别SCI-E
WOS记录号WOS:000401239100032
WOS关键词SPECIES RICHNESS ; LITTER QUALITY ; ECOSYSTEM MULTIFUNCTIONALITY ; DECOMPOSITION ; RESPONSES ; BIODIVERSITY ; MAINTENANCE ; LINKAGES ; ARIDITY ; TRAITS
WOS类目Biodiversity Conservation ; Ecology
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200032
作者单位1.Consejo Nacl Invest Cient & Tecn, CCT Mendoza, Inst Argentino Invest Zonas Aridas IADIZA, Biodivers Res Grp, CC507, Mendoza, Argentina;
2.Univ Guelph, Sch Environm Sci, Global Ecol Change Lab, Guelph, ON N1G 2W1, Canada;
3.Univ Nacl Rio Negro Sede Andina, Inst Invest Recursos Nat Agroecol & Desarrollo Ru, Viedma, Rio Negro, Argentina
推荐引用方式
GB/T 7714
Chillo, Veronica,Ojeda, Ricardo A.,Capmourteres, Virginia,et al. Functional diversity loss with increasing livestock grazing intensity in drylands: the mechanisms and their consequences depend on the taxa[J],2017,54(3):986-996.
APA Chillo, Veronica,Ojeda, Ricardo A.,Capmourteres, Virginia,&Anand, Madhur.(2017).Functional diversity loss with increasing livestock grazing intensity in drylands: the mechanisms and their consequences depend on the taxa.JOURNAL OF APPLIED ECOLOGY,54(3),986-996.
MLA Chillo, Veronica,et al."Functional diversity loss with increasing livestock grazing intensity in drylands: the mechanisms and their consequences depend on the taxa".JOURNAL OF APPLIED ECOLOGY 54.3(2017):986-996.
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