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Coastal ecosystems worldwide support an estimated 80% of the global annual fish catch and provide an estimated US$12 trillion in socio-economic benefits known as “ecosystem services,” so it’s vital to understand how their characteristics influence how they are changing. Twenty years ago, a comparative study of two coastal ecosystems – the Chesapeake Bay and the Northern Adriatic – looked at common issues including nutrient pollution, overfishing, and inter-jurisdictional management.