Primeros registros de incremento en los niveles plasmáticos de glucosa en individuos adultos de Pleurodema thaul (Lesson, 1826) (Anura: Leptodactylidae) sometidos a estrés por frío

This study analyzed the synthesis of glucose in Pleurodema thaul exposed to cold thermal stress as an antifreezing molecule. The plasma glucose concentrations were measured using a glucose meter Accu-Chek Active and a commercial kit. The results showed signifi cant increase of plasma glucose in individuals under the cold thermal stress, indicating that glucose have a function as antifreeze mechanism in this species.El presente estudio analizó las variaciones en la concentración plasmática de glucosa en el anfibio, Pleurodema thaul sometido a estrés térmico por frío. Para ello, se midieron las concentraciones plasmáticas de este metabolito utilizando un glucómetro Accu-Chek Active y un kit comercial. Los resultados muestran signifi cativos incrementos de glucosa en los individuos sometidos al estrés térmico por frío, por lo que se identifi ca a la glucosa como elemento anticongelante en esta especie

Seawater carbonate chemistry and total wet weight, metabolically active tissue, ingestion rate and oocyte diameter of Adult Mussels Mytilus chilensis

The effect of CO2-driven ocean acidification (OA) on marine biota has been extensively studied mostly on a single stage of the life cycle. However, the cumulative and population-level response to this global stressor may be biased due to transgenerational effects and their impacts on physiological plasticity. In this study, we exposed adult mussels Mytilus chilensis undergoing gametogenesis to two pCO2 levels (550 and 1200 μatm) for 16 weeks, aiming to understand if prolonged exposure of reproductive individuals to OA can affect the performance of their offspring, which, in turn, were reared under multiple stressors (pCO2, temperature, and dissolved cadmium). Our results indicate dependence between the level of pCO2 of the broodstock (i.e., parental effect) and the performance of larval stages in terms of growth and physiological rates, as a single effect of temperature. While main effects of pCO2 and cadmium were observed for larval growth and ingestion rates, respectively, the combined exposure to stressors had antagonistic effects. Moreover, we found a suppression of feeding activity in post-spawning broodstock upon high pCO2 conditions. Nevertheless, this observation was not reflected in the final weight of the broodstock and oocyte diameter. Due to the ecological and socioeconomic importance of mussels' species around the globe, the potential implications of maternal effects for the physiology, survival, and recruitment of larvae under combined global-change stressors warrant further investigation