Santovito, Gianfranco (2025) Gianfranco Santovito (2025) CAN ANTARCTIC FISH FACE MARINE HEATWAVE-LIKE EVENTS? EXPLORING CARDIAC PHYSIOLOGY OF TREMATOMUS BERNACCHII USING BIO-LOGGERS AND STRESS BIOMARKERS. [Data Collection]
Collection description
Rising seawater temperatures fundamentally reshape marine ecosystems, with the Southern Ocean exhibiting heightened vulnerability to climatic perturbations. Antarctic teleosts have evolved under near-constant sub-zero conditions, developing unique physiological adaptations. In this study, we investigated the responses of Trematomus bernacchii, an endemic Antarctic fish, to three successive marine heatwave-like events. Using state-of-the-art implantable bio-loggers, we continuously monitored core body temperature and heart rate over 15 days, revealing a statistically significant positive correlation between internal temperature and cardiac performance, increasing by approximately 25% per °C. Molecular analyses of cardiac tissue revealed a novel sequential antioxidant response. An early upregulation of gpx4 suggests immediate mitochondrial protection against lipid peroxidation, while subsequent induction of gpx1, prdx3, and prdx5 indicates a broader cytosolic defence. Furthermore, the marked decoupling between elevated gpx1 transcript levels and diminished Selenium-dependent glutathione peroxidase enzymatic activity highlights a hitherto unrecognised post-transcriptional regulatory mechanism under acute thermal stress. Our findings suggest that T. bernacchii activates a sequential, organ-specific stress response to short-term warming, which may allow it to overcome episodic heatwaves.
| DOI: |  10.25430/researchdata.cab.unipd.it.00001628 |
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| Keywords: | Trematomus bernacchii, Heat stress, Gene expression, Bio-loggers, Oxidative stress, Antioxidant defence, Cardiac tissue | ||||||
| Subjects: | Life Sciences > Physiology, Pathophysiology and Endocrinology: Organ physiology, pathophysiology, endocrinology, metabolism, ageing, tumorigenesis, cardiovascular diseases, metabolic syndromes > Comparative physiology and pathophysiology | ||||||
| Department: | Departments > Dipartimento di Biologia (DiBio) | ||||||
| Depositing User: | Gianfranco Santovito | ||||||
| Date Deposited: | 21 Aug 2025 07:41 | ||||||
| Last Modified: | 21 Aug 2025 07:41 | ||||||
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| Type of data: | Other | ||||||
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| Resource language: | English | ||||||
| Metadata language: | English | ||||||
| Publisher: | Research Data Unipd | ||||||
| Date: | 19 August 2025 | ||||||
| Copyright holders: | The Author | ||||||
| URI: | https://researchdata.cab.unipd.it/id/eprint/1628 |
orcid.org/0000-0001-8260-7006
