endangered species 29 Conservation 12 Ecosystems 10 Forestry 8 Biodiversity 5 biodiversity 5 China 4 Land use 4 human activity 4 Ecology 3 Fish 3 Fisheries 3 Indicator indicator 3 Mammalia 3 United States 3 Varanidae 3 bird 3 conservation management 3 habitat fragmentation 3 invasive species 3 nature conservation 3 protected area 3 restoration ecology 3 taxonomy 3 Amphibia 2 Birds 2 Chondrichthyes 2 DNA 2 Ecoregions 2 Endangered species 2