Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia ...

• Main Author: Zandt, Emma Ingrid
• Format: Text
• Language: unknown
• Published: University of Plymouth 2024
• Subjects: Ocean acidification; Hypoxia; Physiology; FOS Biological sciences; Metabolic rate; Population comparison; ResM; Arctic; Climate change
• Online Access: https://dx.doi.org/10.24382/5132; https://pearl.plymouth.ac.uk/handle/10026.1/21901

Periodic episodes of low oxygen (hypoxia) and elevated CO2 (hypercapnia) accompanied by low pH occur naturally in Norwegian fjord systems. Under the influence of climate change, the geographic range and intensity of hypoxia and hypercapnia are predicted to increase, especially considering the phenomenon of Arctic amplification. To examine the metabolic variability and physiological capabilities of amphipods to these stressors, a series of physiological measurements were performed on latitudinal subpopulations (60° and 69°) of the amphipod Echinogammarus marinus, acclimated to different natural thermal regimes. The effects of elevated pCO2 and hypoxia, separate and together, on thermal sensitivity (Q10), metabolic rate, activation energy (Ea), aerobic threshold and aerobic scope were evaluated by determining whole-animal rates of oxygen uptake (MO2). Our results showed no metabolic cold adaptation in the colder-water, high-latitude population (69°). While MO2, aerobic threshold and scope were reduced compared ...