Environmental unpredictability shapes glucocorticoid regulation across populations of tree swallows.

Abstract:

:The ability to respond appropriately to challenges is an important contributor to fitness. Variation in the regulation of glucocorticoid hormones, which mediate the phenotypic response to challenges, can therefore influence the ability to persist in a given environment. We compared stress responsiveness in four populations of tree swallows (Tachycineta bicolor) breeding under different environmental conditions to evaluate support for different selective pressures in driving the evolution of glucocorticoid regulation. In accordance with the environmental unpredictability hypothesis, stronger stress responses were seen in more unpredictable environments. Contrary to the reproductive value hypothesis, the stress response was not lower in populations engaging in more valuable reproductive attempts. Populations with stronger stress responses also had stronger negative feedback, which supports a "mitigating" rather than a "magnifying" effect of negative feedback on stress responses. These results suggest that combining a robust stress response with strong negative feedback may be important for persisting in unpredictable or rapidly changing environments.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zimmer C,Taff CC,Ardia DR,Rose AP,Aborn DA,Johnson LS,Vitousek MN

doi

10.1038/s41598-020-70161-4

subject

Has Abstract

pub_date

2020-08-13 00:00:00

pages

13682

issue

1

issn

2045-2322

pii

10.1038/s41598-020-70161-4

journal_volume

10

pub_type

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