Quantifying the evidence for biodiversity effects on ecosystem functioning and services
Tóm tắt
Concern is growing about the consequences of biodiversity loss for ecosystem functioning, for the provision of ecosystem services, and for human well being. Experimental evidence for a relationship between biodiversity and ecosystem process rates is compelling, but the issue remains contentious. Here, we present the first rigorous quantitative assessment of this relationship through meta‐analysis of experimental work spanning 50 years to June 2004. We analysed 446 measures of biodiversity effects (252 in grasslands), 319 of which involved primary producer manipulations or measurements. Our analyses show that: biodiversity effects are weaker if biodiversity manipulations are less well controlled; effects of biodiversity change on processes are weaker at the ecosystem compared with the community level and are negative at the population level; productivity‐related effects decline with increasing number of trophic links between those elements manipulated and those measured; biodiversity effects on stability measures (‘insurance’ effects) are not stronger than biodiversity effects on performance measures. For those ecosystem services which could be assessed here, there is clear evidence that biodiversity has positive effects on most. Whilst such patterns should be further confirmed, a precautionary approach to biodiversity management would seem prudent in the meantime.
Từ khóa
Tài liệu tham khảo
Crawley M.J., 1993, Glim for Ecologists
Díaz S., 2005, Trends and Conditions, 279
Harper J.L., 1977, Plant Population Biology
Kinzig A., 2002, Functional Consequences of Biodiversity: Empirical Progress and Theoretical Extensions
Lepš J., 2004, Vegetation Ecology, 199
MA, 2003, Ecosystems and Human Well‐being: A Framework for Assessment
MA, 2005, Ecosystems and Human Well‐Being: Synthesis
May R.M., 1981, Theoretical Ecology: Principles and Applications
Petchey O., 2002, Biodiversity and Ecosystem Functioning. Synthesis and Perspectives, 127, 10.1093/oso/9780198515708.003.0011
Raffaelli D., 2002, Biodiversity and Ecosystem Functioning: Synthesis and Perspectives, 147, 10.1093/oso/9780198515708.003.0013
Rosenberg M.J., 2000, Metawin 2.0 User's Manual: Statistical Software for Meta‐Analysis
Schmid B., 2002, Functional Consequences of Biodiversity: Experimental Progress and Theoretical Extensions, 120
Sokal R.R., 1995, Biometry. The Principles and Practice of Statistics in Biological Research
Zavaleta E.S., 2004, Realistic species losses disproportionately reduce grassland resistance to biological invaders, Proc. Natl Acad. Sci. USA, 306, 1175