Indicator indicator 12 Indicator species Conservation 7 Ecosystems 7 Biodiversity 6 Forestry 6 biodiversity 5 Birds 4 Land use 4 Varanidae 4 species diversity 4 Environmental protection 3 Surveys 3 Vegetation 3 Bioindicator species 2 Biomarkers 2 Food chain 2 Monitoring 2 Population distribution 2 Protected areas 2 Species composition 2 Species richness 2 agricultural land 2 anthropogenic effect 2 bioindicator 2 biomonitoring 2 conservation status 2 endangered species 2 environmental change 2 grassland 2