Table 1.

Marine biodiversity maintenance function assessment indicators.

Aspects	Types	Indicators	Grading criteria
			High ecological importance	Mid ecological importance
Species diversity	Species range	Population size	Endangered/critically endangered	Vulnerable
		Regional importance	Concentration area	Migratory zones
Ecosystem diversity	Coral reefs	Scale	Top 80% of scale	Bottom 20% of scale
	Mangroves	Scale	Top 80% of scale	Bottom 20% of scale
	Sea beds	Scale	Top 80% of scale	Bottom 20% of scale
	Coastal salt marshes	Scale	Top 50% of scale	Bottom 50% of scale
	Mudflats	Scale	Top 50% of scale	Bottom 50% of scale
		Regional Importance	A species of bird that exceeds 1% of its East Asian population
		Biological communities	Top 50% of macrobenthic species diversity	Bottom 50% of macrobenthic species diversity
	Estuaries	Scale	Top 50% of scale	Bottom 50% of scale
		Productivity	Chlorophyll concentration above 6 ug/L	Chlorophyll concentration below 6 ug/L
		Regional importance	A bird species that exceeds 1% of its East Asian population or is important in supporting the life history of a fishery resource such as migration	The rest estuaries
		Biological communities	Top 50% of spawning stock density	Bottom 50% of spawning stock density
	islands	Regional importance	A species of bird that exceeds 1% of its East Asian population	The rest islands
		Vegetation cover	Top 50% of vegetation cover	Bottom 50% of vegetation cover
		Importance of rights and interests	Islands in the territorial sea base point, islands in the territorial sea base point protection area	–
	Other endemic habitats such as oyster reefs, tidal sand ridges, etc	Uniqueness	High	–
Genetic diversity	Aquatic germplasm resource distribution area32	Regional importance	Aquatic Germplasm Resource Reserve Core Area	Aquatic germplasm resource reserve general area
	Fishery resources growth and breeding area	Regional importance	Spawning grounds	Important baiting grounds, wintering grounds, migratory corridors, etc
		Species importance	Keystone species	Common species