Table S3. A concrete case of research synthesis: Reporting of location of the study area and sampling points. For our meta-analysis (Vetter et al 2013), we analyzed 20 articles testing for effects of tropical forest edges on bird nest predation risk. Since forest cover was not consistently reported in primary articles, we used the location of the study area and generated the desired data ourselves via satellite images and GIS software.

Article / Coordinates of the study site(s) and precision / Map / Map with coordinates or distinct reference points* / Precise locations of sampling points
Arango-Vélez and Kattan 1997 / no / yes, Fig. 1 / no / no
Burkey 1993 / yes, delineation (degrees/minutes), p. 139 / no / no / no
Chiarello et al 2008 / yes, delineation (minutes), p. 3211 / yes, Fig. 1 / no / no
Cooper and Francis 1998 / yes (minutes), p. 199 / no / no / no
Duca et al 2001 / no / no / no / no
Eriksson et al 2001 / yes (minutes), p. 743 / (Fig. 1, satellite image) / no / no
Estrada et al 2002 / yes (minutes), p. 200 / no / no / no
Gibbs 1991 / yes (minutes), p. 156 / no / no / no
Hanson et al 2007 / yes (minutes), p. 501 / no / no / no
Hausmann et al 2005 / yes, delineation (minutes), p. 2333 / no / no / no
Kotze and Lawes 2007 / yes (minutes), p. 295 / no / no / no
Latta et al 1995 / no / no / no / no
Laurance et al 1993 / yes (minutes), p.712 / yes, Fig. 1 / yes, Fig. 1 (coordinates in precision of minutes) / no
Lindell 2000 / yes (minutes), p. 17 / no / no / no
Maina and Jackson 2003 / yes, delineation (minutes), p. 162 / yes, Fig. 1 / yes, Fig. 1 (highway as reference point) / no
Melo and Marini 1997 / yes (minutes), Table 1 / yes, Fig. 1 / yes, Fig. 1 (coordinates in precision of minutes) / no
Pangau-Adam et al 2006 / yes, delineation (minutes), p. 4144 / yes, Fig. 1 / no / no
Piper et al 2002 / no / no / no / no
Spanhove et al 2009 / yes (minutes), p. 369 / yes, Fig. 1 / no / no
Tabarelli and Mantovani 1997 / yes, delineation (minutes), p. 700 / no / no / no


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