Adrenal response to competitive singing: glucocorticoid metabolites in male Saltator similis (Aves, Thraupidae)
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View abstract on PubMed
Summary
This summary is machine-generated.Male Green-winged Saltators in song competitions show lower overall glucocorticoid metabolite (GCM) levels but acute stress spikes on competition days. Further research is needed to assess bird welfare during these events.
Area Of Science
- Avian Ecology
- Animal Behavior
- Endocrinology
Background
- Song competitions are popular in Brazil, involving passerine birds like the Green-winged Saltator (Saltator similis).
- Understanding the physiological stress responses of these birds during competitions is crucial for assessing their welfare.
Purpose Of The Study
- To evaluate the adrenal response in male Green-winged Saltators during song competitions.
- To compare glucocorticoid metabolite (GCM) levels in birds participating in competitions versus a control group under similar ex situ conditions.
Main Methods
- Collected uro-faecal extract samples from male S. similis on a rest day (D-3), day before (D-1), day of (D0), and day after (D1) competitions.
- Measured GCM levels using a validated direct enzyme immunoassay (EIA, CJM006).
- Compared GCM levels between competition participants and a control group not involved in competitions.
Main Results
- The competition group exhibited lower average GCM concentrations (33.43 ± 22.09 ng/g) compared to the control group (70.09 ± 29.45 ng/g; P = 0.01).
- GCM concentrations significantly increased on the competition day (D0: 38.29 ± 26.12 ng/g) compared to the rest day (D-3: 28.64 ± 17.86 ng/g; P = 0.02).
- The observed spike in GCM levels on competition day suggests an acute stress response.
Conclusions
- Male Green-winged Saltators experience acute stress during song competitions, indicated by elevated GCM levels.
- Further investigation is required to ascertain the welfare implications for birds in competition settings and to understand potential long-term stress effects.
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