{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T19:19:26Z","timestamp":1791832766553,"version":"4.3.4"},"reference-count":91,"publisher":"The Company of Biologists","issue":"20","license":[{"start":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T00:00:00Z","timestamp":1698710400000},"content-version":"vor","delay-in-days":16,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100000780","name":"European Commission","doi-asserted-by":"crossref","award":["GAP 890948"],"award-info":[{"award-number":["GAP 890948"]}],"id":[{"id":"10.13039\/501100000780","id-type":"DOI","asserted-by":"crossref"}]},{"name":"National Science Foundation","award":["IOS-1655269"],"award-info":[{"award-number":["IOS-1655269"]}]},{"name":"University of Groningen: Rijksuniversiteit Groningen"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,10,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>The acute stress response can be considered the primary evolutionary adaptation to maximise fitness in the face of unpredictable environmental challenges. However, the difficulties of assessing physiology in natural environments mean that comparatively little is known about how response variation influences fitness in free-living animals. Currently, determining acute stress physiology typically involves blood sampling or cardiac monitoring. Both require trapping and handling, interrupting natural behaviour, and potentially biasing our understanding toward trappable species\/individuals. Importantly, limits on repeated sampling also restrict response phenotype characterisation, vital for linking stress with fitness. Surface temperature dynamics resulting from peripheral vasomotor activity during acute stress are increasingly promoted as alternative physiological stress indicators, which can be measured non-invasively using infrared thermal imaging, overcoming many limitations of current methods. Nonetheless, which aspects of stress physiology they represent remains unclear, as the underlying mechanisms are unknown. To date, validations have primarily targeted the hypothalamic\u2013pituitary\u2013adrenal axis, when the sympathetic\u2013adrenal\u2013medullary (SAM) system is likely the primary driver of vasomotor activity during acute stress. To address this deficit, we compared eye and bill region surface temperatures (measured using thermal imaging) with SAM system activity (measured as heart rate variability via electrocardiogram telemetry) in wild-caught captive house sparrows (Passer domesticus) during capture and handling. We found that lower body surface temperatures were associated with increased sympathetic nervous system activation. Consequently, our data confirm that body surface temperatures can act as a proxy for sympathetic activation during acute stress, providing potentially transformative opportunities for linking the acute stress response with fitness in the wild.<\/jats:p>","DOI":"10.1242\/jeb.246552","type":"journal-article","created":{"date-parts":[[2023,9,28]],"date-time":"2023-09-28T05:51:00Z","timestamp":1695880260000},"source":"Crossref","is-referenced-by-count":27,"title":["It's cool to be stressed: body surface temperatures track sympathetic nervous system activation during acute stress"],"prefix":"10.1242","volume":"226","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1527-3859","authenticated-orcid":false,"given":"Paul","family":"Jerem","sequence":"first","affiliation":[{"name":"Groningen Institute for Evolutionary Life Sciences, University of Groningen 1 , 9700 CC Groningen , The Netherlands"},{"name":"Tufts University 2 Department of Biology , , Medford , MA 02155, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. 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