Nationally, there are currently 1257 floral and 425 faunal species listed as threatened under the Environment Protection and Biodiversity Conservation Act 1999, many of which occur on the coast. Several protected species are now stable or improving, demonstrating the benefits of good management. Crocodiles, for example, are increasing everywhere within their natural range, and mangroves have been increasing in extent in most parts of Australia. In contrast, migratory shorebirds are deteriorating, despite protection in Australia, likely because of the destruction of critical habitat in other countries along their migratory route. Continued decline of saltmarsh and seagrass habitats is a significant concern, given their role in coastal productivity, biodiversity maintenance, sediment stabilisation and carbon sequestration.