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Table 10 Summary of the main effects highlighted in the narrative syntheses

From: Can linear transportation infrastructure verges constitute a habitat and/or a corridor for insects in temperate landscapes? A systematic review

Specific questionGroupMain effects on insect biodiversityType of evidenceSusceptibility to biasb
Q1 habitat/management practicesA: vegetation restoration+ to NS6 control-impact studies6 medium
B: artificialization of the LTI− to NS4 control-impact studies, 1 BACI study1 low, 4 medium
C: mowing and grazingDifficult to synthesize (inconsistencies)5 control-impact studies, 1 BACI study1 low, 5 medium
Q2 habitat in LTI verges vs. at proximityD: Coleoptera in terrestrial LTI verges in comparison with other habitatsDifficult to synthesize (inconsistencies)10 control-impact studies6 low, 4 medium
E: pollinators in terrestrial LTI verges in comparison with other habitatsNS to +8 control-impact studies4 low, 4 medium
F: “unwanted species” in road verges in comparison with other habitatsNS to +7 control-impact studies2 low, 5 medium
G: other groupsa in terrestrial LTI verges in comparison with other habitatsNS to +10 control-impact studies6 low, 4 medium
H: all species in aquatic LTI verges in comparison with other habitatsNot possible to conclude (too few and inconsistent studies)3 control-impact studies1 low, 2 medium
Q3 dispersal/management practicesNo article  
Q4 dispersal in LTI verges vs. at proximityNot possible to conclude (too few and inconsistent studies)2 control-impact studies2 medium
Q5 habitat/surrounding landscapeI: urbanization in the surrounding landscape− to NS7 control-impact studies3 low, 4 medium
J: agriculture in the surrounding landscape− to NS5 control-impact studies1 low, 4 medium
K: natural or protected areas in the surrounding landscapeNS to +4 control-impact studies1 low, 3 medium
L: forested areas in the surrounding landscapeNS to +3 control-impact studies2 low, 1 medium
Q6 dispersal/surrounding landscapeNo article  
  1. + positive effect, negative effect, NS statistically non-significant effect, NS to + effects mainly statistically non-significant but sometimes positive, + to NS effects mainly positive but sometimes statistically non-significant
  2. aInsects different from Coleoptera, pollinators and “unwanted species”
  3. bMedium: study with medium level of susceptibility to bias, low: study with low level of susceptibility to bias