Details

Autor(en) / Beteiligte

• Ryan, Thomas A.
• Taff, Conor C.
• Zimmer, Cedric
• Vitousek, Maren N.

Titel

Cold temperatures induce priming of the glucose stress response in tree swallows

Ist Teil von

• Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 2023-06, Vol.280, p.111419-111419, Article 111419

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2023

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Capricious environments often present wild animals with challenges that coincide or occur in sequence. Conceptual models of the stress response predict that one threat may prime or dampen the response to another. Although evidence has supported this for glucocorticoid responses, much less is known about the effects of previous challenges on energy mobilization. Food limitation may have a particularly important effect, by altering the ability to mobilize energy when faced with a subsequent challenge. We tested the prediction that challenging weather conditions, which reduce food availability, alter the energetic response to a subsequent acute challenge (capture and restraint). Using a three-year dataset from female tree swallows measured during three substages of breeding, we used a model comparison approach to test if weather (temperature, wind speed, and precipitation) over 3- or 72-hour timescales predicted baseline and post-restraint glucose levels, and if so which environmental factors were the strongest predictors. Contrary to our predictions, weather conditions did not affect baseline glucose; however, birds that had experienced lower temperatures over the preceding 72 h tended to have higher stress-induced glucose when faced with an acute stressor. We also saw some support for an effect of rainfall on stress-induced glucose: around the time that eggs hatched, birds that had experienced more rainfall over the preceding 72 h mounted lower responses. Overall, we find support in a wild animal for the idea that the glucose stress response may be primed by exposure to prior challenges. [Display omitted] •Baseline and stress-induced glucose were measured in female tree swallows.•Baseline glucose was not influenced by weather in the preceding 3 or 72 h.•Stress-induced glucose increase tended to be primed by 3-days of colder temperature.•The energetic stress response appears susceptible to priming in wild tree swallows.