Evolution of an increased performance under acute challenge does not exacerbate vulnerability to chronic stress.
Sci Rep
; 12(1): 2126, 2022 02 08.
Article
en En
| MEDLINE
| ID: mdl-35136150
An adequate stress response plays a vital role in coping with challenges. However, if selection for improved coping with an acute challenge affects the entire stress response system, susceptibility to adverse effects of chronic stressors can be deepened. Here, we used bank voles from lines selected for high swim-induced aerobic metabolism (A) and unselected control (C), and asked if the selection affected sensitivity to chronic mild stress (CMS). The voles were first habituated to daily weighing and feces collection for three weeks, and then for two weeks were exposed to CMS or remained undisturbed. The habituation itself resulted in an increased swim-induced oxygen consumption in both line types, and a decreased body mass. The CMS treatment caused reduction of food consumption in the second week of the experiment, and, in males, a decline in the metabolic rate. Paradoxically, fecal corticosterone metabolites decreased in the CMS-treated group. The response to CMS did not differ between the line types. Thus, the selection for increased performance was not traded off by increased vulnerability to chronic stress. The counter-intuitive results may even lead to a speculation that bank voles-and perhaps also other animals-prefer experiencing unpredictable, unpleasant stressors over the monotony of standard laboratory housing.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Condicionamiento Físico Animal
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Estrés Fisiológico
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Arvicolinae
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Evolución Biológica
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Selección Artificial
Límite:
Animals
Idioma:
En
Revista:
Sci Rep
Año:
2022
Tipo del documento:
Article
País de afiliación:
Polonia
Pais de publicación:
Reino Unido