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Table 1 The different components of the systematic map

From: What evidence exists on how changes in marine ecosystem structure and functioning affect ecosystem services delivery? A systematic map protocol

PECO elements Definition(s)
Population
 Marine biodiversity (ecosystems and species) This will include all types of marine ecosystems and the species that they contain
Exposure
 Types of changes in marine biodiversity All changes at all levels, from species to the ecosystems, functional and structural
Comparator
 Spatial difference—temporal difference Spatial difference or difference in time
Outcomes
 Marine ecosystem services (and disservices) All qualitative or quantitative values of marine ecosystem services and disservices