Ecosystems 146 Biodiversity 95 Conservation 69 Research & information: general 62 biodiversity 60 Biology, life sciences 58 Forestry 55 China 51 Ecological science, the Biosphere 46 Indicator indicator 36 climate change 35 Climate change 34 Conservation of the environment 31 Conservation of wildlife & habitats 31 Land use 30 Fish 27 Research and information: general 27 Rivers 27 nonhuman 26 species richness 26 species diversity 25 habitat 23 Animals 22 United States 22 Vegetation 22 article 22 habitat fragmentation 22 Environmental management 21 habitat quality 21 human 21