AI Article Synopsis
- Stress responses are physiological and behavioral reactions to harmful stimuli, but they can become detrimental in certain conditions.
- The Mexican cavefish serves as a model for studying the genetics behind behavioral evolution and shows reduced stress responses at larval stages, and increased glucocorticoid receptor expression.
- Variations in stress responses were observed across different cavefish populations, suggesting their adaptations are linked to their predator-scarce environments.
Article Abstract
Stress responses are conserved physiological and behavioral outcomes as a result of facing potentially harmful stimuli, yet in pathological states, stress becomes debilitating. Stress responses vary considerably throughout the animal kingdom, but how these responses are shaped evolutionarily is unknown. The Mexican cavefish has emerged as a powerful system for examining genetic principles underlying behavioral evolution. Here, we demonstrate that cave Astyanax have reduced behavioral and physiological measures of stress when examined at larval stages. We also find increased expression of the glucocorticoid receptor, a repressible element of the neuroendocrine stress pathway. Additionally, we examine stress in three different cave populations, and find that some, but not all, show reduced stress measures. Together, these results reveal a mechanistic system by which cave-dwelling fish reduced stress, presumably to compensate for a predator poor environment.
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| http://dx.doi.org/10.1002/jez.b.22987 | DOI Listing |
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