Threatened aquatic habitats

Most threatened species are land-based (with more than half occurring in forests), but evidence is growing of the vulnerable nature of freshwater habitats and marine habitats such as coral reefs. In the USA, for example, freshwater species are at greater risk than terrestrial species, with nearly 70 per cent of the mussels, 50 per cent of the crayfish and 37 per cent of the fishes considered under threat.