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Table 2 The eligibility criteria for article screening

From: What are the effects of even-aged and uneven-aged forest management on boreal forest biodiversity in Fennoscandia and European Russia? A systematic review

Question elements Eligibility criteria
Populations Included:
Boreal forests in Fennoscandia and European Russia (the dominating tree species in the study area must be spruce or pine)
Exposure Included:
Even-aged forest management
Uneven-aged forest management
Excluded:
Thinning (studies where the objective is to study precisely the effects of thinning, thinned even-aged forests were included)
Retention (articles where the objective is to study precisely the effects of retention)a
Management where the stems and all cutting biomass were left in the forest (restoration, not for production purposes)
Comparators Included:
Young even-aged forest, age ≤ 80 years
Mature even-aged forest, age ≥ 80 years
Natural or near-natural forests, including protected forest areas, national parks
Retention felling (only included in the case of experimental studies where traditional clearcut (i.e. all the trees are removed) is one of the treatments; otherwise even-aged forests where retention felling had been done were included as even-aged forest)
Excluded:
Non-forest lands, e.g. agricultural areas, parks in urban areas
Tree plantations not considered to be forest, e.g. Christmas tree plantations
Forested peatlands
Outcomes Included:
Species richness
Abundance (counts or coverage)
excluded:
All data on non-terrestrial species and bacteria
Data on tree species
Amount of dead wood (is treated as an effect modifier)
Community composition indices
Species biomasses
Visiting frequency/habitat occupancy/breeding success etc.
Number of nests/grouse leks/ant mounds etc.
Study design Included:
Control-intervention field studies
Excluded:
Simulation/modelling studies (even partly simulated/modelled)
Studies where exposure/comparator and outcome data are from different sources (combining the data of two different field data)
Habitat selection studies
Edge effect studies (But included if there are separate areas, for example, clearcut interior/edge area/forest interior. In addition, interior areas should be located far enough from the edge relative to the species in question so that edge effects do not compromise the results)
Studies, where the study subject (often lichen) is transplanted to the exposure/comparator area
Language Included:
English
Finnish
Swedish
Russian
  1. aThere has been a recent meta-analysis on the impact of retention on biodiversity [19]