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How carryover effects manifest, however, may vary depending on the type and magnitude of risks that animals face in subsequent life-stages. The influence of carryover effects on cause-specific mortality remains largely unclear, particularly during vulnerable life-stages, including juvenile periods. We proposed and investigated the\n                    <jats:italic>Cause-specific carryover hypothesis,<\/jats:italic>\n                    that the relative influence of traits developed during a previous stage on mortality during the next vary by cause of mortality, using juvenile sagebrush songbirds (Brewer\u2019s sparrow,\n                    <jats:italic>Spizella breweri<\/jats:italic>\n                    ; sagebrush sparrow,\n                    <jats:italic>Artemisiospiza nevadensis<\/jats:italic>\n                    ; sage thrasher,\n                    <jats:italic>Oreoscoptes montanus<\/jats:italic>\n                    ) as a focal system. We tracked birds during the post-fledging period (a juvenile period following the nestling period), identified the rates and causes of mortality, and tested the relative influence of different nestling traits (wing length, tarsus length, feather development, and body condition) on post-fledging mortality risk. Carryover effects varied across co-occurring species and differed by cause of mortality, and tarsus length had an unexpected and outsized impact on predation risk in the two sparrows. Although wing morphology typically is considered the most important trait for mobility in birds, most mortalities occurred during the first 5 days of the post-fledging period when altricial fledglings were incapable of flight and likely relied on running or scrambling ability to escape predators. Therefore, carryover effects were driven by stage-specific behavior during the period of highest risk. Developing animals may face investment trade-offs between morphological traits that influence different types of risk during different subsequent stages.\n                  <\/jats:p>","DOI":"10.1007\/s00442-026-05887-5","type":"journal-article","created":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T17:17:31Z","timestamp":1781889451000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Carryover effects across juvenile periods vary by species, cause-specific mortality, and stage-specific behavior"],"prefix":"10.1007","volume":"208","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-5338-7424","authenticated-orcid":false,"given":"Emily R.","family":"Shertzer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donald W.","family":"Jones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna D.","family":"Chalfoun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,19]]},"reference":[{"key":"5887_CR1","doi-asserted-by":"publisher","first-page":"73","DOI":"10.1016\/j.anbehav.2023.01.012","volume":"198","author":"C Aastrup","year":"2023","unstructured":"Aastrup C, Nilsson J-\u00c5, Hasselquist D, Hegemann A (2023) Size and immune function as predictors of predation risk in nestling and newly fledged jackdaws. 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