Numbers of research papers by taxonomic class for four marine ecosystems.

CR – Coral reefs, KF – Kelp forests, MF – Mangrove forests, SB – Seagrass beds. Class information was obtained from the World Registry of Marine Species (WoRMS [16]). Only classes with at least 10 occurrences in the literature indexed in Web of Science® for any of the four ecosystems are shown. A full list of all classes with at least 1 occurrence can be found in Table S1.The two most studied classes for each ecosystem are shown in bold. Common names are not comprehensive but provide examples for the groups; in some cases no common names specific for the group exist and more general common names are provided.