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Evaluating the social and ecological effectiveness of partially protected marine areas

Marine protected areas (MPAs) are a primary tool for the stewardship, conservation, and restoration of marine ecosystems, yet 69% of global MPAs are only partially protected (i.e., are open to some form of fishing). Although fully protected areas have well-documented outcomes, including increased fish diversity and biomass, the effectiveness of partially protected areas is contested.

Custodians of the globe’s blue carbon assets

Over the last decades scientists have discovered that seagrass meadows, tidal marshes, and mangroves – “blue carbon” ecosystems – are among the most intensive carbon sinks in the biosphere. By sequestering and storing significant amounts of carbon from the atmosphere and ocean, blue carbon ecosystems help mitigate climate change. But conversion and degradation of these ecosystems can also release billions of tons of CO2  and other greenhouse gases into the ocean and atmosphere and contribute to global warming.

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Compared to fully safeguarded marine protected areas, partially protected areas have little benefit for marine life or people’s enjoyment...an in-depth study of MPAs along Australia’s southern coast shows that these partially protected reserves are largely ineffective—both for protectin