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Abundant and ecologically important coralline algae may be particularly susceptible to OA; however, multi\u2010stressor studies and those on articulated morphotypes are lacking. Here, we use field observations and laboratory experiments to elucidate the impacts of warming and acidification on growth, calcification, mineralogy, and photophysiology of the temperate articulated coralline alga, <jats:italic>Calliarthron tuberculosum.<\/jats:italic> We conducted a 4\u2010week fully factorial mesocosm experiment exposing individuals from a southern CA kelp forest to current and future temperature and pH\/<jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> conditions (+2\u00b0C, \u22120.5 pH units). Calcification was reduced under warming (70%) and further reduced by high <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> or high <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> x warming (~150%). Growth (change in linear extension and surface area) was reduced by warming (40% and 50%, respectively), high <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> (20% and 40%, respectively), and high <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> x warming (50%\u2009and 75%, respectively). The maximum photosynthetic rate (P<jats:sub>max<\/jats:sub>) increased by 100% under high <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> conditions, but we did not detect an effect of <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> or warming on photosynthetic efficiency (\u03b1). We also did not detect the effect of warming or <jats:italic>p<\/jats:italic>CO<jats:sub>2<\/jats:sub> on mineralogy. However, variation in Mg incorporation in cell walls of different cell types (i.e., higher mol % Mg in cortical vs. medullary) was documented for the first time in this species. These results support findings from a growing body of literature suggesting that coralline algae are often more negatively impacted by warming than OA, with the potential for antagonistic effects when factors are combined.<\/jats:p>","DOI":"10.1111\/jpy.13272","type":"journal-article","created":{"date-parts":[[2022,6,3]],"date-time":"2022-06-03T12:20:45Z","timestamp":1654258845000},"page":"517-529","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Consequences of warming and acidification for the temperate articulated coralline alga, <i>Calliarthron tuberculosum<\/i> (Florideophyceae, Rhodophyta)"],"prefix":"10.1111","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5190-0151","authenticated-orcid":false,"given":"Emily M.","family":"Donham","sequence":"first","affiliation":[{"name":"University of California Santa Cruz Ecology and Evolutionary Biology  130 McAllister Way, Santa Cruz California 95060 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scott L.","family":"Hamilton","sequence":"additional","affiliation":[{"name":"Moss Landing Marine Laboratories San Jose State University  8272 Moss Landing Rd Moss Landing California 95039 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivano","family":"Aiello","sequence":"additional","affiliation":[{"name":"Moss Landing Marine Laboratories San Jose State University  8272 Moss Landing Rd Moss Landing California 95039 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nichole N.","family":"Price","sequence":"additional","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences  60 Dr, East Boothbay Bigelow Maine 04544 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer E.","family":"Smith","sequence":"additional","affiliation":[{"name":"Scripps Institution of Oceanography  9500 Gilman Dr, La Jolla California 92093 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,7,2]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps07639"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0804478105"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40641-015-0008-4"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mio.2014.08.003"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1890\/03-9000"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2486.2011.02409.x"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-017-02777-y"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1029\/2020GL089553"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.3389\/fmars.2019.00186"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41558-019-0681-8"},{"key":"e_1_2_9_12_1","first-page":"1","article-title":"Understanding coralline algal responses to ocean acidification: Meta\u2010analysis and synthesis","volume":"2021","author":"Cornwall C. 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