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Taxon-free analyses of functional traits (ecometrics) allow for testing the performance of such traits through time, utilizing both the fossil record and paleoenvironmental proxies. Here, we test the role of body size as a functional trait with respect to climate, using turtles as a model system. We examine the influence of mass-specific metabolic rate as a functional factor in the sorting of body size with environmental temperature and investigate the utility of community body size composition as an ecometric correlated to climate variables. We then apply our results to the fossil record of the Plio-Pleistocene Shungura Formation in Ethiopia. Results show that turtle body sizes scale with mass-specific metabolic rate for larger taxa, but not for the majority of species, indicating that metabolism is not a primary driver of size. Body size ecometrics have stronger predictive power at continental than at global scales, but without a single, dominant predictive functional relationship. Application of ecometrics to the Shungura fossil record suggests that turtle paleocommunity ecometrics coarsely track independent paleoclimate estimates at local scales. We hypothesize that both human disruption and biotic interactions limit the ecometric fit of size to climate in this clade. Nonetheless, examination of the consistency of trait\u2013environment relationships through deep and shallow time provides a means for testing anthropogenic influences on ecosystems.<\/jats:p>","DOI":"10.1073\/pnas.2201948119","type":"journal-article","created":{"date-parts":[[2023,2,6]],"date-time":"2023-02-06T15:24:21Z","timestamp":1675697061000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":10,"title":["The utility of body size as a functional trait to link the past and present in a diverse reptile clade"],"prefix":"10.1073","volume":"120","author":[{"given":"Abigail K.","family":"Parker","sequence":"first","affiliation":[{"name":"Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ United Kingdom"},{"name":"University Museum of Zoology, University of Cambridge, Cambridge, CB2 3EJ United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johannes","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Leibniz-Institut f\u00fcr Evolutions- und Biodiversit\u00e4tsforschung, Museum f\u00fcr Naturkunde, Berlin, 10115 Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jean-Renaud","family":"Boisserie","sequence":"additional","affiliation":[{"name":"Laboratory Paleontology Evolution Paleoecosystems Paleoprimatology, CNRS &amp; Universit\u00e9 de Poitiers, Poitiers, F-86000 France"},{"name":"French Centre for Ethiopian Studies, CNRS &amp; Ministry of Europe and Foreign Affairs, Addis Ababa, PO BOX 5554 Ethiopia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2237-6901","authenticated-orcid":false,"given":"Jason J.","family":"Head","sequence":"additional","affiliation":[{"name":"Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ United Kingdom"},{"name":"University Museum of Zoology, University of Cambridge, Cambridge, CB2 3EJ United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2023,2,6]]},"reference":[{"key":"e_1_3_4_1_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.tree.2006.02.002"},{"key":"e_1_3_4_2_2","doi-asserted-by":"publisher","DOI":"10.2307\/1468026"},{"key":"e_1_3_4_3_2","doi-asserted-by":"publisher","DOI":"10.5735\/086.051.0221"},{"key":"e_1_3_4_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-3207(01)00197-5"},{"key":"e_1_3_4_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10531-010-9798-9"},{"key":"e_1_3_4_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/ecm.1454"},{"key":"e_1_3_4_7_2","first-page":"127","article-title":"Dental ecometrics of tropical Africa: Linking vegetation types and communities of large plant-eating mammals","volume":"19","author":"Zliobaite I.","year":"2018","unstructured":"I. 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