{
  "abstract": "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 δ13C and δ15N, 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.",
  "abstract_shown": true,
  "affiliations": [
    "Departamento de Ciencias Ecológicas, Universidad de Chile, Facultad de Ciencias 1 , Ñuñoa, Santiago Metropolitan Region, Chile",
    "Escuela de Medicina Veterinaria, Universidad Mayor 2 , Santiago, Chile",
    "Universidad Austral de Chile 3 , Valdivia, Chile",
    "Instituto de Ciencias Ambientales y Evolutivas 4 , Valdivia, Chile",
    "Millenium Nucleus of Patagonian Limit of Life (LiLi) 5 , Valdivia, Chile",
    "Department of Environmental Sciences, Universidad de Castilla-La Mancha—Campus de Toledo 6 , Toledo, Spain",
    "Departamento de Ciencias, Universidad Adolfo Ibanez 7 , Peñalolén, Santiago Metropolitan Region, Chile",
    "Department of Biology, University of New Mexico Consortium of the Americas for Interdisciplinary Science 8 , Albuquerque, NM, USA"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Pablo Sabat",
      "orcid": "0000-0002-6609-9969"
    },
    {
      "affs": [
        0
      ],
      "name": "Antonia Beltran-Hayet"
    },
    {
      "affs": [
        0
      ],
      "name": "Francisco del Basto"
    },
    {
      "affs": [
        0
      ],
      "name": "Benjamin Corvalán"
    },
    {
      "affs": [
        1
      ],
      "name": "Natalia Ramirez-Otarola"
    },
    {
      "affs": [
        0
      ],
      "name": "Felipe Alvarez-Vergara"
    },
    {
      "affs": [
        0
      ],
      "name": "Diego Landaeta"
    },
    {
      "affs": [
        2,
        3,
        4
      ],
      "name": "Roberto Nespolo"
    },
    {
      "affs": [
        5
      ],
      "name": "Juan C. Sanchez-Hernandez"
    },
    {
      "affs": [
        6
      ],
      "name": "Karin Maldonado"
    },
    {
      "affs": [
        7
      ],
      "name": "Seth D. Newsome",
      "orcid": "0000-0002-4534-1242"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1p9xcrphg6c9p.bib",
  "cited_by": 1,
  "doi": "10.1098/rsos.261499",
  "fulltext_url": null,
  "id": "1p9xcrphg6c9p",
  "issns": [
    "2054-5703"
  ],
  "landing_url": "https://royalsocietypublishing.org/rsos/article/13/10/261499/483517/Trophic-position-structures-physiological-trade",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2303|Isotope Analysis in Ecology"
    ]
  ],
  "openalex": "W7220717107",
  "pdf_url": "https://royalsocietypublishing.org/rsos/article-pdf/doi/10.1098/rsos.261499/6169019/rsos.261499.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "The Royal Society",
  "ris": "https://research.draconitic.com/paper/1p9xcrphg6c9p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:45Z",
      "native_id": "10.1098/rsos.261499",
      "source": "crossref",
      "url": "https://royalsocietypublishing.org/rsos/article/13/10/261499/483517/Trophic-position-structures-physiological-trade"
    }
  ],
  "subjects": [
    {
      "field": "biology",
      "origin": "openalex:2303|Isotope Analysis in Ecology",
      "subfield": "ecology"
    }
  ],
  "title": "Trophic position structures physiological trade-offs between metabolic and detoxification pathways in sympatric passerines",
  "title_text": "Trophic position structures physiological trade-offs between metabolic and detoxification pathways in sympatric passerines",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:45Z",
  "url": "https://research.draconitic.com/paper/1p9xcrphg6c9p",
  "venue": "Royal Society Open Science",
  "versions": []
}