Estimating thermal sensitivities in ectotherms: Warming with temperature oscillation enhance critical thermal maximum and metabolic plasticity in aphids
Monday, November 14, 2022
8:24 AM – 8:36 AM PT
Location: Vancouver Convention Centre, Meeting Room 214
University of New England Armidale, New South Wales, Australia
Aphid’s thermal-physiology is predominantly biased towards the effects of rising mean temperatures, whereas the effects of fluctuating, extreme climatic events are largely overlooked. This study assessed the impacts of waming and oscillating temperatures on the CTmax and metabolic rate of Acyrthosiphon pisum and Megoura crassicauda Mordvilko, using thermolimit respirometry. In this study, we used nine temperature regimes: four fluctuating temperature regimes (increased by +0°C, +2°C, +4°C and +5°C from field-recorded, fluctuating base temperatures), four constant temperature (19°C, 21°C, 23°C and 24°C) with a control temperature of 25°C as treatments. We found that CTmax of both aphid species were significantly higher at elevated fluctuating temperature compare with its corresponding constant temperature. Metabolic rates increases with temperature, peaked, and then drop at the highest temperatures. Findings of this study demonstrated that aphids developed metabolic plasticity by means of physiological adjustments to rise their CTmax to better cope with temperature changes, which would have great importance to comprehensive planning in informed pest management decision-making