Ecological effects of full and partial protection in the crowded Mediterranean Sea: a regional meta-analysis

Sylvaine Giakoumi, Claudia Scianna, Jeremiah Grahm Plass-Johnson, Fiorenza Micheli, Kirsten Grorud-Colvert, Pierre Thiriet, Joachim Claudet, Giuseppe Di Carlo, Antonio Di Franco, Steven D. Gaines, Jose Antonio García-Charton, Jane Lubchenco, Jessica Reimer, Enric Sala, Paolo Guidetti

Research output: Contribution to journalJournal articleResearchpeer-review

221 Downloads (Pure)


Marine protected areas (MPAs) are a cornerstone of marine conservation. Globally, the number and coverage of MPAs are increasing, but MPA implementation lags in many human-dominated regions. In areas with intense competition for space and resources, evaluation of the effects of MPAs is crucial to inform decisions. In the human-dominated Mediterranean Sea, fully protected areas occupy only 0.04% of its surface. We evaluated the impacts of full and partial protection on biomass and density of fish assemblages, some commercially important fishes, and sea urchins in 24 Mediterranean MPAs. We explored the relationships between the level of protection and MPA size, age, and enforcement. Results revealed significant positive effects of protection for fisheries target species and negative effects for urchins as their predators benefited from protection. Full protection provided stronger effects than partial protection. Benefits of full protection for fish biomass were only correlated with the level of MPA enforcement; fish density was higher in older, better enforced, and -interestingly- smaller MPAs. Our finding that even small, well-enforced, fully protected areas can have significant ecological effects is encouraging for "crowded" marine environments. However, more data are needed to evaluate sufficient MPA sizes for protecting populations of species with varying mobility levels.
Original languageEnglish
Article number8940
JournalScientific Reports
Issue number1
Publication statusPublished - 2017


Dive into the research topics of 'Ecological effects of full and partial protection in the crowded Mediterranean Sea: a regional meta-analysis'. Together they form a unique fingerprint.

Cite this