{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T19:09:44Z","timestamp":1791400184726,"version":"4.3.3"},"reference-count":57,"publisher":"The Royal Society","issue":"10","license":[{"start":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T00:00:00Z","timestamp":1791331200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100020884","name":"Agencia Nacional de Investigaci\u00f3n y Desarrollo","doi-asserted-by":"publisher","award":["1241249"],"award-info":[{"award-number":["1241249"]}],"id":[{"id":"10.13039\/501100020884","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Resource use links ecological context to organismal performance, yet whether dietary breadth or trophic position is more closely associated with physiological state in wild birds remains unclear. We used a natural trophic gradient in a sympatric passerine assemblage to test whether trophic position and isotopic niche breadth are associated with integrated physiological phenotypes. We studied three co-occurring passerine species in central Chile spanning a trophic spectrum (granivorous, omnivorous, insectivorous). Using blood \u03b413C and \u03b415N, we quantified isotopic niche width and estimated trophic position, then compared these metrics with physiological variables measured in free-living birds (n = 60), including differential leukocyte counts, antioxidant capacity, and enzymatic markers of oxidative metabolism, glutathione-related physiology, and plasma esterase activity. Isotopic niche width differed among species but was weakly associated with physiological variation. By contrast, estimated trophic position showed stronger species-level correspondence with multivariate physiological organization. Metabolic and enzyme-based variables contributed most to interspecific physiological differentiation, whereas baseline non-enzymatic antioxidant buffering was conserved. Overall, estimated trophic position showed a stronger correspondence with coordinated physiological variation than isotopic niche breadth. These findings highlight species-level physiological differences associated with trophic position and provide a basis for broader comparative analyses of ecological and evolutionary influences on avian physiology.<\/jats:p>","DOI":"10.1098\/rsos.261499","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T00:08:04Z","timestamp":1791331684000},"source":"Crossref","is-referenced-by-count":1,"title":["Trophic position structures physiological trade-offs between metabolic and detoxification pathways in sympatric passerines"],"prefix":"10.1098","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6609-9969","authenticated-orcid":false,"given":"Pablo","family":"Sabat","sequence":"first","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonia","family":"Beltran-Hayet","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco","family":"del Basto","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin","family":"Corval\u00e1n","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Ramirez-Otarola","sequence":"additional","affiliation":[{"name":"Escuela de Medicina Veterinaria, Universidad Mayor 2 , Santiago, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe","family":"Alvarez-Vergara","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diego","family":"Landaeta","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Ecol\u00f3gicas, Universidad de Chile, Facultad de Ciencias 1 , \u00d1u\u00f1oa, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Nespolo","sequence":"additional","affiliation":[{"name":"Universidad Austral de Chile 3 , Valdivia, Chile"},{"name":"Instituto de Ciencias Ambientales y Evolutivas 4 , Valdivia, Chile"},{"name":"Millenium Nucleus of Patagonian Limit of Life (LiLi) 5 , Valdivia, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan C.","family":"Sanchez-Hernandez","sequence":"additional","affiliation":[{"name":"Department of Environmental Sciences, Universidad de Castilla-La Mancha\u2014Campus de Toledo 6 , Toledo, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karin","family":"Maldonado","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias, Universidad Adolfo Ibanez 7 , Pe\u00f1alol\u00e9n, Santiago Metropolitan Region, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4534-1242","authenticated-orcid":false,"given":"Seth D.","family":"Newsome","sequence":"additional","affiliation":[{"name":"Department of Biology, University of New Mexico Consortium of the Americas for Interdisciplinary Science 8 , Albuquerque, NM, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"2026100704115491800_RSOS261499C1","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1007\/s00442-023-05474-y","article-title":"Seasonal changes in diet, immune function, and oxidative stress in three passerines inhabiting a Mediterranean climate","volume":"203","author":"Ram\u00edrez-Otarola","year":"2023","journal-title":"Oecologia"},{"key":"2026100704115491800_RSOS261499C2","doi-asserted-by":"crossref","first-page":"1211","DOI":"10.1007\/s00442-015-3267-9","article-title":"Relationships between isotopic values and oxidative status: insights from populations of gentoo penguins","volume":"177","author":"Beaulieu","year":"2015","journal-title":"Oecologia"},{"key":"2026100704115491800_RSOS261499C3","doi-asserted-by":"crossref","first-page":"coac018","DOI":"10.1093\/conphys\/coac018","article-title":"A meta-analysis of impacts of immune response and infection on oxidative status in vertebrates","volume":"10","author":"Costantini","year":"2022","journal-title":"Conserv. 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