Maternal temperature stress modulates acclimation and thermal biology in Octopus maya (Cephalopoda: Octopodidae) juvenile progeny

Abstract

High temperatures alter the physiological condition of Octopus maya embryos, juveniles, and adults, and the time of exposure could have a key role in their thermal tolerance. The present study evaluates the effects of temperature and exposure time on octopus juveniles obtained from a thermally stressed female and a control female when exposed to optimal (25 °C) and high temperatures (30 °C) for 20 and 30 days, respectively. The results showed a transgenerational temperature effect that was expressed with low survival, depressed routine resting and high metabolic rates. Moreover, a collapse of antioxidant defense enzymes and high levels of oxidative damage products were detected in juveniles from thermally stressed females. Stress was lethal for animals acclimated at 30 °C, while the performance of juveniles acclimated at optimal temperature (25 °C) was conditioned by high oxidative stress levels and a reduction of the high metabolic rate (HMR) even after 30 days of experiment. In contrast, juveniles from the non-thermally stressed female had an optimal performance when acclimated at 25 °C but at 30 °C, they had a comparatively higher HMR during the first 8 days. These results suggest energy surplus in those animals to escape from warming scenarios before experiencing oxidative damage accumulation. Further studies should confirm if epigenetic alterations could be involved.

Climate change consequences on the systemic heart of female Octopus maya: oxidative phosphorylation assessment and the antioxidant system

“…It is also important for vitamin E regeneration and reactivation of inhibited proteins for oxidation ( Halliwell and Gutteridge, 2008 ). In cephalopods an imbalance in the prooxidant-antioxidant homeostasis has been detected in warming conditions even in embryos ( Domínguez-Castanedo et al, 2023 ; Kuan et al, 2022 ; Repolho et al, 2014 ), juveniles ( Vargas-Abúndez et al, 2023 ) and adults ( Meza-Buendía et al, 2021 ).…”

“…For its part, we have been observing that O. maya ( Voss and Solís-Ramírez, 1966 ) is particularly sensitive to high temperatures, which suggests that its cardiovascular system could be less tolerant than S. officinalis . It explains, at least in part, the relatively limited thermal tolerance observed in embryos ( Caamal-Monsreal et al, 2016 ; Domínguez-Castanedo et al, 2023 ), juveniles ( Noyola et al, 2013a , b ; Vargas-Abúndez et al, 2023 ) and adults ( Domínguez-Estrada et al, 2022 ; Juárez et al, 2015 , 2016 , 2022 ; Meza-Buendía et al, 2021 ; Pascual et al, 2019 ).…”