Table 1.
Definition and justification of response and explanatory variables entering the hurdle model.
Each variable was characterized for every 25km2 grid cell considered in this study (see Fig 1).
Fig 1.
Number of Caatinga biodiversity and conservation publications (in grey) and percentage of Caatinga publications in relation to Brazilian biodiversity and conservation research (in black).
Fig 2.
Top-10 contributing universities in number of scientific publications for Caatinga biodiversity and conservation science.
Fig 3.
Distribution of recorded field sites for Caatinga biodiversity and conservation research between 1993 and 2008 (left panel) and 1993 and 2017 (right panel).
Table 2.
Results of Hurdle modelling analysis.
The hurdle component refers to presence/absence of research sites; the count component refers to number of research sites in cells with at least one recorded study.