Seagrasses, a functional group of marine flowering plants rooted in the world’s coastal oceans, support
marine food webs and provide essential habitat for many coastal species, playing a critical role in the
equilibrium of coastal ecosystems and human livelihoods. For the first time, the probability of extinction
is determined for the world’s seagrass species under the Categories and Criteria of the International
Union for the Conservation of Nature (IUCN) Red List of Threatened Species. Several studies have
indicated that seagrass habitat is declining worldwide. Our focus is to determine the risk of extinction
for individual seagrass species, a 4-year process involving seagrass experts internationally, compilation
of data on species’ status, populations, and distribution, and review of the biology and ecology of each
of the world’s seagrass species. Ten seagrass species are at elevated risk of extinction (14% of all seagrass
Seagrasses, a functional group of marine flowering plants rooted in the world’s coastal oceans, supportmarine food webs and provide essential habitat for many coastal species, playing a critical role in theequilibrium of coastal ecosystems and human livelihoods. For the first time, the probability of extinctionis determined for the world’s seagrass species under the Categories and Criteria of the InternationalUnion for the Conservation of Nature (IUCN) Red List of Threatened Species. Several studies haveindicated that seagrass habitat is declining worldwide. Our focus is to determine the risk of extinctionfor individual seagrass species, a 4-year process involving seagrass experts internationally, compilationof data on species’ status, populations, and distribution, and review of the biology and ecology of eachof the world’s seagrass species. Ten seagrass species are at elevated risk of extinction (14% of all seagrass
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