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We tested whether petal light transmission and internal floral temperature influence microbial abundance in two co\u2010occurring species,\n                          <jats:italic>Lyonia lucida<\/jats:italic>\n                          and\n                          <jats:italic>Lyonia fruticosa<\/jats:italic>\n                          (Ericaceae), which have translucent petal \u2018windows\u2019 that modify internal light environments.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>We measured internal and external floral temperatures, quantified culturable microbial abundance (yeasts, molds, bacteria), and assessed ultraviolet (UV) and infrared (IR) petal transmission using spectrometry. We then experimentally tested the UV resistance of microbial communities across 108 flowers from 18 plants. Additionally, we used manipulative light experiments to test whether IR radiation drove differences in floral warming between these two species.<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          Petal windows transmitted more UV and IR radiation than pigmented tissue. Internal floral temperature predicted microbial abundance, with warmer flowers harboring fewer microbes. A spectral filter experiment confirmed that IR radiation warms\n                          <jats:italic>L. lucida<\/jats:italic>\n                          flowers but not\n                          <jats:italic>L. fruticosa<\/jats:italic>\n                          , while natural variation in UV transmission did not predict microbial abundance or UV resistance.\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>Petal spectral traits shape floral microclimate and microbial abundance primarily through temperature\u2010mediated filtering linked to IR\u2010driven warming rather than passive UV sterilization. These results position flowers as microhabitats where petal traits constrain microbial communities.<\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>","DOI":"10.1111\/nph.71608","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T07:02:07Z","timestamp":1791356527000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Petal infrared transmission warms flowers and reduces microbial abundance"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-9720-7903","authenticated-orcid":false,"given":"Jessica N.","family":"Williams","sequence":"first","affiliation":[{"name":"Department of Biological Sciences Florida Atlantic University  Davie FL 33314 USA"},{"name":"Integrative Biology Program Florida Atlantic University  Davie FL 33314 USA"},{"name":"School of Environment, Coastal, and Ocean Sustainability Florida Atlantic University  Boca Raton FL 33431 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6432-1810","authenticated-orcid":false,"given":"Daniel A.","family":"Barker","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences Florida Atlantic University  Davie FL 33314 USA"},{"name":"School of Environment, Coastal, and Ocean Sustainability Florida Atlantic University  Boca Raton FL 33431 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-6154-2087","authenticated-orcid":false,"given":"Antonia J.","family":"Millet","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences Florida Atlantic University  Davie FL 33314 USA"},{"name":"Integrative Biology Program Florida Atlantic University  Davie FL 33314 USA"},{"name":"School of Environment, Coastal, and Ocean Sustainability Florida Atlantic University  Boca Raton FL 33431 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0602-4084","authenticated-orcid":false,"given":"Jonathan M.","family":"Carcache","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences Florida Atlantic University  Davie FL 33314 USA"},{"name":"Integrative Biology Program Florida Atlantic University  Davie FL 33314 USA"},{"name":"School of Environment, Coastal, and Ocean Sustainability Florida Atlantic University  Boca Raton FL 33431 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3534-3113","authenticated-orcid":false,"given":"Jacob S.","family":"Francis","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences Florida Atlantic University  Davie FL 33314 USA"},{"name":"Integrative Biology Program Florida Atlantic University  Davie FL 33314 USA"},{"name":"School of Environment, Coastal, and Ocean Sustainability Florida Atlantic University  Boca Raton FL 33431 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,7]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cois.2020.08.006"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/nph.70644"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0067556"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/1365-2435.70037"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.18637\/jss.v067.i01"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1674\/0003-0031-174.2.204"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajb2.70150"},{"key":"e_1_2_9_9_1","unstructured":"BorchersHW.2023.pracma: practical numerical math functions. 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