Threshold parameters of temperature and hypoxia of Halobatrachus didactylus (Bloch & Schneider, 1801)

JUAN MANUEL MOLINA; ANDREAS KUNZMANN; JOÃO PENA REIS; PEDRO GUERREIRO

MAr del plata

Workshop; 5to Workshop de Fisiología Ecológica y del Comportamiento; 2023

IIMYC, universidad nacional de mar del plata

In a context of climate change, warming of the seas and expansion of hypoxic zones are challenges that mostspecies of sh are, or will be subjected to. Understanding how dierent species cope with these changes intheir environments at individual level can shed light on how populations and ecosystems will be aected.We provide rst-time estimates on thermal and oxygen-related limits for Halobatrachus didactylus, a coastalsedentary sh that lives in intertidal environments of north-east Atlantic. Using respirometry in dierentexperimental designs we found that this species is highly resistant to acute thermal stress (CTmax: 34.82+/- 0.66 °C) and acute hypoxia (Pcrit: 0.404 +/- 0.034 mg O2L-1). We found size-specic dierences in thisresponse, with smaller individuals being more sensitive. The resilience parameters obtained in this study forthis species showcase it as an ideal experimental model for further work on climate change and physiology.