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Table 2 Quantitative reviews and meta-analyses of pollination and biological control selected for this review

From: Pollination and biological control research: are we neglecting two billion smallholders

 

Author

Theme

Total studies*

Agricultural studies

Pollination

Ricketts et al. [58]

Distance to natural habitat

22

22

Winfree et al. [39]

Disturbance

50

27

Williams et al. [59]

Disturbance

21

11

Garibaldi et al. [29]

Isolation from natural habitat

29

29

Garibaldi et al. [53]

Crop pollination by insects

43

43

Kennedy et al. [50]

Local and landscape effects

34

34

Shackelford et al. [22]

Local and landscape complexity

19

19

Unique studies (n)

 

115

88

Biological control

Letourneau et al. [60]

Natural enemy diversity

63

30

Chaplin-Kramer et al. [61]**

Landscape complexity

45

44

Veres et al. [25]

Landscape complexity

25

24

Shackelford et al. [22]

Local and landscape complexity

28

28

Unique studies (n)

 

138

102

  1. *The number of studies we present may differ with those presented by a review as some combined studies from different years at the same location into single entries. These were spilt for the purposes of this review. Other quantitative reviews (QRs) split single studies into multiple entries when more than one crop was investigated. Here we consider them as a single study.
  2. **46 studies were used in this review but one PhD thesis (O’Rourke, 2010) was omitted due to lack of access.