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Table 4 Selection rate for the different bibliographic sources

From: Evidence of the impact of noise pollution on biodiversity: a systematic map

Type of bibliographic sources Bibliographic sources Exported citations (A) Included articles after screening stages
Systematic map (B) 2019–2020 group (C) Total ratio regarding exported citations (B + C)/A (%)
Bibliographic databases Web of Science Core Collection 8544
(7859a + 685b)
860 (48%) 115 (82%) 11
Scopus 12045 (11,186a + 859b) 306 (17%) 18 (13%) 3
Total 20,589 1166 (65%) 133 (9%) 6
Web-based search engines Google Scholar 3403 (3293a + 110b) 143 (8%) 4 (3%) 4
BASE 600 25 (1%) 3 (2%) 5
CORE 327 50 (3%) 0 15
TOTAL 4330 218 (12%) 7 (5%) 5
Call for literature 83 21 (1%) 1 (< 1%) 27
Bibliographies of relevant reviews 4025 341 (19%) 0 8
Specialist websites 9 9 (< 1%) 0 100
Other manually included articles 39 39 (2%) 0 100
TOTAL 29,075 1794 141 7
  1. High score (in bold); low score (in italic)
  2. a First search until 2018
  3. b Update 2019–2020