The phenological responses of plants, particularly early flowering, are considered important biological indicators of climate change and the rhododendron results were among the most dramatic.
This discovery could potentially lead to the identification of chronic fatigue biomarkers (examinable biological indicators that can be used for diagnosis).
We're also looking at climate change over time, and butterflies are biological indicator species since they are associated with particular plants as caterpillars and often found in particular habitats.
To facilitate efficient sterilisation by steam and pressure, there are several methods of verification and indication used; these include colour-changing indicator tapes and biological indicators.