A change in functional or morphological traits occurring once or repeatedly  during the lifetime of an individual organism in its natural environment. Through acclimatisation, the individual maintains performance across a range of environmental conditions. For a clear differentiation between findings in laboratory and field studies, the term 'acclimation is used in ecophysiology for the respective phenomena when observed in well-defined experimental settings. The term ' plasticity characterises the generally limited scope of changes in phenotype that an individual can reach through the process of acclimatisation.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report