{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,10]],"date-time":"2025-07-10T06:10:07Z","timestamp":1752127807490,"version":"3.41.2"},"reference-count":67,"publisher":"Wiley","license":[{"start":{"date-parts":[[2025,7,9]],"date-time":"2025-07-09T00:00:00Z","timestamp":1752019200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Exp Zool Pt A"],"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Glucocorticoids (GCs) regulate suites of traits that can have far\u2010reaching consequences on reproduction and survival. While studies of GC effects on performance are common, results vary widely in their relationship to fitness. Focusing studies on performance metrics that have repercussions for both reproduction and survival may help clarify extended consequences of GC secretion. In this study we evaluated relationships between endogenous GC reactivity, body condition, food availability, and breeding\u2010site departure during storms in a population of white\u2010crowned sparrows early in the breeding season, asking whether GC secretion in response to our capture and handling challenge predicts natural behavioral responses to inclement weather, and whether food availability influences that decision. Our data support a role for GC reactivity in decisions to abandon nascent territories, in that more reactive individuals\u2014those with higher free CORT in response to capture and handling stress\u2014depart sooner during storms. In this case only free GCs (unbound to corticosteroid binding globulin) predict behavior, supporting the hypothesis that free hormone in the plasma is the biologically active fraction. We also suggest a role for food availability in these decisions, as males that located a supplemental food source did not depart during a storm. The very small sample size in the feeding study, however, limits any broad conclusions. All together these data (1) link GC reactivity (free max GC) to a naturally\u2010induced behavior, and (2) support that individual variation in GC elevation has consequences for trade\u2010offs in survival and reproduction.<\/jats:p>","DOI":"10.1002\/jez.70006","type":"journal-article","created":{"date-parts":[[2025,7,10]],"date-time":"2025-07-10T05:49:48Z","timestamp":1752126588000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Maximum Free Glucocorticoids Link Natural Behavior and Stressors in a Wild Bird Population"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0394-909X","authenticated-orcid":false,"given":"Creagh W.","family":"Breuner","sequence":"first","affiliation":[{"name":"Ecology and Evolution\/Wildlife Biology Programs The University of Montana Missoula Montana USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joely G.","family":"DeSimone","sequence":"additional","affiliation":[{"name":"Appalachian Laboratory, Frostburg University of Maryland Center for Environmental Science Cambridge Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B.","family":"Sunny Domschot","sequence":"additional","affiliation":[{"name":"Wildlife Biology Program The University of Montana Missoula Montana USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas P.","family":"Hahn","sequence":"additional","affiliation":[{"name":"Neurobiology, Physiology, and Behavior University of California at Davis Davis California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,7,9]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1016\/j.yhbeh.2008.02.021","article-title":"Parental Investment and Its Sensitivity to Corticosterone is Linked to Melanin\u2010Based Coloration in Barn Owls","volume":"54","author":"Almasi B.","year":"2008","journal-title":"Hormones and Behavior"},{"key":"e_1_2_9_3_1","doi-asserted-by":"crossref","first-page":"355","DOI":"10.2307\/3676661","article-title":"Interactions of Corticosterone With Feeding, Activity and Metabolism in Passerine Birds","volume":"23","author":"Astheimer L. 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