Buchumschlag

Physiological Trade-Offs Under Thermal Variability in the Giant Lion’s Paw Scallop (Nodipecten subnodosus): Metabolic Compensation and Oxidative Stress

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Veröffentlicht in:Stresses vol. 5, no. 3 (2025), p. 42-60
1. Verfasser: Joachin-Mejia, Natalia G
Weitere Verfasser: Racotta Ilie S., Carreño-León, Diana P, Ulaje, Sergio A, Lluch-Cota, Salvador E
Veröffentlicht:
MDPI AG
Schlagworte:
Mexico
Baja California Mexico
Gulf of California
Physiology
Evolution & development
Experiments
Temperature
Carbohydrates
Fisheries
Adaptation
Variables
Fever
Metabolism
Organisms
Lipids
Mitochondrial DNA
Respiration
Climate change
Hyperthermia
Oxidative stress
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Abstract:Understanding how thermal variability affects marine ectotherms is essential for predicting species resilience under climate change. We investigated the physiological responses of juvenile Nodipecten subnodosus (lion’s paw scallop), offspring of two genetically distinct populations (Bahía de Los Ángeles and Laguna Ojo de Liebre), reared under common garden conditions and exposed to three temperature regimes: constant, regular oscillation, and stochastic variability. After 15 days of exposure, scallops underwent an acute hyperthermia challenge. We measured metabolic rates, scope for growth (SFG), tissue biochemical composition, and oxidative stress markers (SOD, CAT, GPx, TBARS). No significant differences were detected between populations for most traits, suggesting that phenotypic plasticity predominates over evolutionary divergence in thermal responses. However, the temperature regime significantly influenced metabolic, biochemical and oxidative stress markers, indicating that scallops in variable conditions compensated through improved energy balance and food assimilation but also showed higher oxidative stress compared to the constant regime. Following acute hyperthermic exposure, energy demand escalated, compensatory mechanisms were impaired, and scallops attained a state of physiological maintenance and survival under stress, irrespective of their population or prior thermal regime exposure.
ISSN:2673-7140
DOI:10.3390/stresses5030042
Quelle:Publicly Available Content Database