Seasonal acclimatization of Asparagopsis taxiformis (Rhodophyta) from different biogeographic regions

摘要: We studied the photosynthetic acclimatization of two populations Asparagopsis taxiformis from biogeographic regions (Santa Catalina Island, California, and Kaneohe Bay, Hawaii) in seasons. compared thermal variability between locations estimated environmental optima tolerance limits photosynthesis to understand relationship phenotypic plasticity at each location. Photosynthetic performance was assessed using oxygen evolution pulsed amplitude modulated fluorometry quantify responses variation. A. both had similar high temperature tolerances for maximum net (Pnetmax) relative electron transport rate rETRmax (~30°C), but different cold tolerances. Respiration rates (summer winter) always increased above 25°C. Chlorophyll fluorescence yield dark-adapted samples decreased warmer temperatures winter colder during summer. Populations exposed greater (across short long time scales) displayed capacity acclimatization. California showed seasonal changes within range (14–21°C), whereas individuals Hawaii did not. The narrower (short-term response) subtropical may make it more susceptible than temperate predicted increases global sea surface temperatures. Acclimatization play an important role enabling respond a variable environment persist regions.