Seasonal acclimation in metabolism reduces light requirements of eelgrass (Zostera marina)

► Eelgrass displays physiological and metabolic acclimation to seasonal temperature changes. ► Temperature acclimation allows eelgrass to grow faster and penetrate to deeper waters. ► Acclimation cannot prevent sudden eelgrass mortality under extreme temperature events. ► Acclimation improve plant performance under slowly changing temperature conditions. ► Deteriorating light conditions is a greater threat than temperature to depth penetration.