marine ecosystem Ecosystems 21 Indicator indicator 6 biodiversity 6 protected area 6 China 5 Reefs 5 conservation management 5 environmental protection 5 marine environment 5 Atlantic Ocean 4 Biodiversity 4 Conservation 4 Fish 4 Fisheries 4 Pacific Ocean 4 Phytoplankton 4 anthropogenic effect 4 biomass 4 coastal zone 4 community structure 4 fish 4 marine policy 4 Anthozoa 3 Bacillariophyta 3 Conservation planning 3 Isotopes 3 Marine ecosystems 3 Marine protected area 3 Pisces 3