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Life history strategies shape ageing patterns at the inter\u2010 and intra\u2010specific level, but the impact of life history strategies on mosaic\u2010ageing patterns <jats:italic>within<\/jats:italic> individuals remains unknown. Reproductive tissues in individuals selected to prioritise reproduction may age faster than somatic tissues because of increased \u2018wear and tear\u2019. Alternatively, individuals that prioritise reproduction may specially protect reproductive tissues at the expense of somatic tissues to allow for increased reproductive function. Here, we used Japanese quail (<jats:styled-content style=\"fixed-case\"><jats:italic>Coturnix japonica<\/jats:italic><\/jats:styled-content>) artificially selected for increased versus reduced reproductive investment (egg size) to test how reproductive strategies modulate within\u2010body variation in ageing patterns, by measuring telomere length as an ageing biomarker in blood cells, spleen and reproductive tissue (oviduct and testis). Although there were absolute, sex\u2010specific differences in telomere length across tissue types, we did not find evidence that an individual's reproductive strategy shapes within\u2010body mosaics of ageing: patterns of relative telomere length in somatic and reproductive tissues were similar in individuals selected for high and low reproductive investment, respectively (i.e., no significant selection regime\u2009\u00d7\u2009tissue type interaction), and consistent strong positive correlations in telomere lengths among blood cells, spleen and reproductive tissue were observed within individuals across reproductive investment selection regimes. Our results suggest that an individual's life history strategy does not affect tissue\u2010specific ageing rates or that \u2018wear and tear\u2019 and \u2018special protection\u2019 mechanisms might act simultaneously and cancel each other out.<\/jats:p>","DOI":"10.1111\/mec.70040","type":"journal-article","created":{"date-parts":[[2025,7,17]],"date-time":"2025-07-17T09:13:54Z","timestamp":1752743634000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["No Evidence That Life History Strategies Shape Within\u2010Body Mosaics of Ageing"],"prefix":"10.1111","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7127-4733","authenticated-orcid":false,"given":"Ana \u00c1ngela","family":"Romero\u2010Haro","sequence":"first","affiliation":[{"name":"Department of Evolutionary Ecology National Museum of Natural Sciences (MNCN\u2010CSIC)  Madrid Spain"},{"name":"Centre for Ecology and Conservation University of Exeter  Penryn UK"},{"name":"Instituto de Investigaci\u00f3n en Recursos Cineg\u00e9ticos IREC (CSIC, UCLM, JCCM)  Ciudad Real Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1956-8734","authenticated-orcid":false,"given":"Ellis","family":"Mulder","sequence":"additional","affiliation":[{"name":"Groningen Institute for Evolutionary Life Sciences University of Groningen  Groningen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1143-6868","authenticated-orcid":false,"given":"Simon","family":"Verhulst","sequence":"additional","affiliation":[{"name":"Groningen Institute for Evolutionary Life Sciences University of Groningen  Groningen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4806-4102","authenticated-orcid":false,"given":"Barbara","family":"Tschirren","sequence":"additional","affiliation":[{"name":"Centre for Ecology and Conservation University of Exeter  Penryn 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