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Zool."],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The araucaria pine (\n                    <jats:italic>Araucaria angustifolia<\/jats:italic>\n                    ) is a putative keystone species in the Araucaria Forest of southern South America. Its large seeds (\n                    <jats:italic>pinh\u00f5es<\/jats:italic>\n                    ) constitute an important food resource for small rodents, whose abundance and trophic dynamics may vary with seed availability. We investigated the dietary importance of\u00a0\n                    <jats:italic>Araucaria angustifolia<\/jats:italic>\n                    \u00a0seeds for three native omnivorous sigmodontine rodents\u2014\n                    <jats:italic>Akodon paranaensis<\/jats:italic>\n                    ,\u00a0\n                    <jats:italic>Oligoryzomys flavescens<\/jats:italic>\n                    , and\u00a0\n                    <jats:italic>Oligoryzomys nigripes<\/jats:italic>\n                    \u2014and evaluated whether their responses to seed availability support a single functional\u2010group assumption. If rodents act as a single functional group, increased pinh\u00e3o consumption should reduce niche breadth, increase interspecific niche overlap, and raise rodent abundance during seed production. We assessed rodent abundance through trapping over ten months spanning seed production and non\u2010production periods and analyzed stomach contents to characterize diet composition. Food items were grouped into five categories, with arthropods, pinh\u00f5es, and other seeds or fruits accounting for more than ninety\u2010five percent of all recorded items. Arthropods were consumed more frequently during the non\u2010production period, particularly by\u00a0\n                    <jats:italic>Akodon paranaensis<\/jats:italic>\n                    . In contrast,\u00a0\n                    <jats:italic>Oligoryzomys<\/jats:italic>\n                    \u00a0species consumed more pinh\u00f5es and reached peak abundance during the production period. Trophic niche overlap was greater than expected by chance only during the non\u2010production period. During seed production,\u00a0\n                    <jats:italic>Oligoryzomys<\/jats:italic>\n                    \u00a0species reduced their niche breadth, whereas\u00a0\n                    <jats:italic>Akodon paranaensis<\/jats:italic>\n                    \u00a0broadened its diet, being less dependent on\u00a0\n                    <jats:italic>Araucaria angustifolia<\/jats:italic>\n                    \u00a0seeds. Overall, species exhibited distinct responses to\n                    <jats:italic>pinh\u00e3o<\/jats:italic>\n                    availability, with\u00a0\n                    <jats:italic>Oligoryzomys<\/jats:italic>\n                    \u00a0spp.\u2014especially\u00a0\n                    <jats:italic>O. nigripes<\/jats:italic>\n                    \u2014showing stronger functional and numerical responses, underscoring their key role in\n                    <jats:italic>Araucaria<\/jats:italic>\n                    seed\u2013rodent interactions.\n                  <\/jats:p>","DOI":"10.1111\/1749-4877.70105","type":"journal-article","created":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T17:05:11Z","timestamp":1776099911000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Availability of a Keystone Plant Resource Reduces Niche Overlap and Drives Distinct Species\u2010Specific Changes in Niche Breadth Among Small Rodents"],"prefix":"10.1111","author":[{"given":"Adriana A.","family":"Perini","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Ecologia de Mam\u00edferos \u2013 Zoologia Universidade do Vale do Rio dos Sinos UNISINOS  S\u00e3o Leopoldo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3488-621X","authenticated-orcid":false,"given":"Emerson M.","family":"Vieira","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Ecologia de Mam\u00edferos \u2013 Zoologia Universidade do Vale do Rio dos Sinos UNISINOS  S\u00e3o Leopoldo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,13]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1146\/annurev.es.14.110183.002043","article-title":"The Theory of Limiting Similarity","volume":"14","author":"Abrams P.","year":"1983","journal-title":"Annual Review of Ecology, Evolution, and Systematics"},{"key":"e_1_2_7_3_1","doi-asserted-by":"crossref","first-page":"807","DOI":"10.1590\/0001-3765201420130063","article-title":"Patterns of Arboreal and Terrestrial Space Use by Non\u2010Volant Small Mammals in an Araucaria Forest of Southern Brazil","volume":"86","author":"Abreu M. 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