Ecosystems 90 Biodiversity 48 Research & information: general 40 Conservation 37 China 35 Biology, life sciences 33 Conservation of wildlife & habitats 31 biodiversity 31 Forestry 28 habitat 23 habitat fragmentation 22 Ecological science, the Biosphere 21 habitat quality 21 Conservation of the environment 20 Indicator indicator 20 Research and information: general 20 climate change 19 nonhuman 19 Rivers 18 Land use 17 article 17 Climate change 16 species richness 15 Technology: general issues 14 Animals 13 Fish 13 habitat type 13 human 13 Birds 12 Environmental policy & protocols 12