Review Appraisals

Review Database

The effects of organic agriculture on biodiversity and abundance: a meta-analysis

Bengtsson, J., J. Ahnstrom & A.-C. Weibull
Journal of Applied Ecology, 42, 261-269. Year: 2005

26 High
Population Bird, Arthropod, Plant
Intervention Organic Agriculture, Conventional Agriculture
Heterogeneity Taxa, Study Design
Outcome Metrics Species Richness, Abundance
Region No Restriction
Criteria Score
Protocol 1 Is an a-priori protocol available? 0
Search Strategy 2.1 Does the search for literature document the use of a comprehensive range of resources? 1
2.2 Are the search strings clearly defined? 0
Including Studies 3.1 Does the review apply clearly documented inclusion criteria to all potentially relevant articles found during the search? 3
3.2 Does the review demonstrate that inclusion decisions are repeatable? 3
3.3 Are inclusion/exclusion decisions transparent? 3
Critical Appraisal 4.1 Does the review critically appraise the methods of each study? 1
4.2 Are studies objectively weighted according to methodological quality? 2
Data Extraction 5.1 Is data extraction documented, repeatable and consistent? 2
5.2 Are the extracted data reported for each study? 3
Data Extraction 6.1 Is a quantitative synthesis conducted? 3
6.2 Is heterogeneity in the impact of the intervention or exposure investigated statistically? 2
6.3 Does the review consider possible publication bias? 3

Assessment of Review

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26 High
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