https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/d3c5e3e3-97bf-4e74-9f8d-523dce5f9270 INDICATOR SPECIES Indicator species are defined as species which can provide information on ecological changes and give early warning signals regarding ecosystem processesin site-specific conditions due to their sensitive reactions to them. They can also be called sentinel species, indicator organisms, biological indicators ('bioindicators'), biological markers, or environmental indicators. The latter three expressions do not necessarily refer to species but also to other environmental elements which can indicate environmental changes.