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The structure of the ungulate tapetum fibrosum is unique, and its reflectance varies temporally in reindeer (<jats:italic>Rangifer tarandus<\/jats:italic>). We used reflectance spectroscopy to characterize the white\u2010tailed deer (<jats:italic>Odocoileus virginianus<\/jats:italic>) tapetum fibrosum and to determine if reflectance varies spatially across the species\u2019 range. Our results revealed spatial variation in tapetal coloration and reflectance across parts of the white\u2010tailed deer's range, with populations displaying distinct spectral profiles. Deer in the northern populations of Missouri, Minnesota, and Indiana primarily possessed more short\u2010wave\u2010reflecting tapeta, whereas deer in the Georgia population exhibited more mid\u2010wave\u2010reflecting tapeta and the tapeta of Texas deer appeared intermediate in reflectance. Our findings suggest that tapetal reflectance in white\u2010tailed deer may be influenced by ecological and environmental pressures that vary spatially. These results suggest that local variations in the spatial and temporal dynamics of the tapetum fibrosum in ungulates may be an adaptive trait.<\/jats:p>","DOI":"10.1002\/jez.70007","type":"journal-article","created":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T10:37:55Z","timestamp":1751452675000},"page":"905-910","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Potential Spectral Tuning of the Tapetum Lucidum in a Broadly Distributed Ungulate"],"prefix":"10.1002","volume":"343","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8854-1818","authenticated-orcid":false,"given":"Blaise A.","family":"Newman","sequence":"first","affiliation":[{"name":"Warnell School of Forestry and Natural Resources University of Georgia Athens Georgia USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"suffix":"Jr.","given":"Billy R.","family":"Hammond","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Georgia Athens Georgia USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gino J.","family":"D'Angelo","sequence":"additional","affiliation":[{"name":"Warnell School of Forestry and Natural Resources University of Georgia Athens Georgia USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,7,2]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11252-019-00840-2"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/wsb.438"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1139\/Z08-050"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/20416695231218520"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.1600377"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2022.1002"},{"volume-title":"Deer of the World: Their Evolution, Behavior, and Ecology","year":"1998","author":"Geist V.","key":"e_1_2_8_8_1"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.053553"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspl.1899.0125"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.1968.0016"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.3390\/ani14030420"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-5224.2004.00318.x"},{"key":"e_1_2_8_14_1","first-page":"187","article-title":"Evolution of the Tapetum","volume":"100","author":"Schwab I. 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