Indicator species

An indicator species is a species whose presence, absence, or abundance provides evidence about environmental conditions, such as pollution, habitat quality, or ecological change.

Lichen bioindication: The use of lichens to assess environmental conditions, especially air quality. Lichen presence and community composition can reveal atmospheric pollution and deposition.
Ecological tolerance: The range of environmental conditions within which an organism can survive and reproduce. Narrow tolerance to a pollutant or habitat condition can make a species informative.
Sentinel species: A species selected to provide an early warning of environmental hazards affecting organisms or people. Sentinels emphasize warning of specific hazards, while indicator species can signal broader conditions.
Confounding variable: A factor associated with both a proposed cause and an outcome that can distort their apparent relationship. Climate, habitat, or land use may explain an indicator pattern attributed to pollution.
Biological monitoring: The use of organisms or biological responses to assess environmental conditions over time. Indicator species are a common tool for tracking ecological condition.
Dose–response relationship: The relationship between the amount of an exposure and the magnitude of a biological response. A predictable response to exposure helps connect species abundance with environmental conditions.
Keystone species: A species whose ecological effects are unusually large relative to its abundance. Keystone status describes ecological influence, not the species’ usefulness as an environmental signal.
Detection probability: The probability of observing a species when it is present in a surveyed area. A nondetection may reflect survey limits rather than genuine absence.
Water quality: The chemical, physical, and biological characteristics of water that determine its suitability for organisms and uses. Aquatic indicator species can reveal nutrient pollution, oxygen stress, and contamination.
Species distribution: The geographic and habitat pattern of where members of a species occur. Observed presence or absence becomes meaningful only against a species’ expected distribution.

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