Table 1. Overview of datasets on the differences in insect diversity between native and non-native plants using the community (1–22) or the biogeographical approach (23–33).
Indicated are for each dataset the plant sample size (number of native/non-native plant species), the mean difference in insect diversity (number of species), and the standardized mean difference in insect diversity (±95% confidence interval). Overall outcome of random effects (RE) model indicated in italics. Significant differences are indicated in bold.
| Dataset and reference | Sample size (native/non-native plants) | Mean difference insect diversity (native–non-native) | Standardized mean diff. insect diversity (±95% CI) | |
|---|---|---|---|---|
| Community approach | ||||
| 1 | Agrawal et al. (2005) | 14/14 | 0.11 | 0.08 [−0.66, 0.82] |
| 2 | Auerbach & Simberloff (1988) | 1/2 | 4.00 | |
| 3 | Bürki & Nentwig (1997) | 1/1 | 0.00 | |
| 4 | Engelkes et al. (2012) | 2/2 | 36.60 | 0.68 [−1.33, 2.70] |
| 5 | Goßner, Gruppe & Simon (2005) | 1/1 | −5.00 | |
| 6 | Goßner, Liston & Späth (2007) | 4/2 | 0.07 | 0.48 [−1.24, 2.20] |
| 7 | Hartley, Rogers & Siemann (2010) | 3/1 | 6.61 | |
| 8 | Harvey et al. (2015) | 5/5 | 0.01 | 0.05 [−1.19 , 1.29] |
| 9 | Helden, Stamp & Leather (2012) | 16/7 | 1.39 | 0.51 [−0.39, 1.41] |
| 10 | Jobin, Schaffner & Nentwig (1996) | 1/1 | 33.00 | |
| 11 | Kennedy & Southwood (1984) | 21/7 | 12.62 | 1.08 [0.18, 1.99] |
| 12 | Leather (1986) | 46/13 | 14.11 | 0.44 [−0.19, 1.06] |
| 13 | Liu & Stiling (2006) | 2/4 | 4.00 | 1.38 [−0.49, 3.24] |
| 14 | Meijer et al. (2015) | 8/20 | 0.31 | 0.79 [−0.06 , 1.63] |
| 15 | Meijer et al. (2015) | 19/19 | 0.40 | 0.50 [−0.15 , 1.14] |
| 16 | Novotny et al. (2003) | 1/2 | −0.82 | |
| 17 | Proches et al. (2008) | 3/9 | 2.26 | 1.02 [−0.35, 2.38] |
| 18 | Radho-Toly, Majer & Yates (2001) | 2/2 | 0.80 | 1.77 [−0.54, 4.08] |
| 19 | Southwood, Moran & Kennedy (1982) | 4/2 | 44.75 | 2.30 [0.16, 4.44] |
| 20 | Southwood, Moran & Kennedy (1982) | 3/3 | 14.00 | 1.33 [−0.44, 3.10] |
| 21 | Southwood et al. (2004) | 2/2 | 130.5 | 1.46 [−0.75, 3.67] |
| 22 | Sugiura (2010) | 102/49 | 0.45 | 0.77 [0.42, 1.13] |
| RE model | 261/168 | 0.67 [0.46 , 0.89] | ||
| Biogeographical approach | ||||
| 23 | Cripps et al. (2006) | 1 | 33.0 | |
| 24 | Goeden (1974) | 1 | 18.0 | |
| 25 | Meijer et al. (2015) | 2 | 0.96 | 0.66 [−1.35 , 2.68] |
| 26 | Meijer et al. (2015) | 12 | 0.31 | 0.31 [−0.49 , 1.12] |
| 27 | Memmott et al. (2000) | 2 | 11.0 | 3.10 [0.19, 6.01] |
| 28 | Moore (1975) | 1 | 2.0 | |
| 29 | Southwood, Moran & Kennedy (1982) | 2 | 51.5 | 4.64 [0.87, 8.40] |
| 30 | Southwood et al. (2004) | 1 | 8.0 | |
| 31 | Szentesi (1999) | 1 | 9.0 | |
| 32 | Wilson & Flanagan (1990) | 1 | 42.0 | |
| 33 | Wilson, Flanagan & Gillett (1990) | 1 | 19.0 | |
| RE model | 25 | 1.59 [−0.19–3.37] | ||