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Snow algae have red\u2010colored pigments that darken snow surfaces, lowering its albedo and accelerating snowmelt. Despite their importance to the cryosphere, we know little about controls on snow algal productivity and biomass.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Here, we characterize photophysiology from diverse natural field\u2010collected populations of alpine snow algae from the North Cascades of Washington, USA, where the major red\u2010bloom producing genera <jats:italic>Chlainomonas<\/jats:italic>, <jats:italic>Sanguina<\/jats:italic>, and <jats:italic>Rosetta<\/jats:italic> were present. We tested short\u2010term physiological responses of snow algae to light (0\u20133000\u2009\u03bcmol\u2009m<jats:sup>\u22122<\/jats:sup>\u2009s<jats:sup>\u22121<\/jats:sup>) and CO<jats:sub>2<\/jats:sub> levels (0\u20131600\u2009ppm), allowing us to determine the saturating light and CO<jats:sub>2<\/jats:sub> levels for snow algal community net photosynthesis.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>All snow algal communities surveyed were adapted to extremely high light levels (3000\u2009\u03bcmol\u2009m<jats:sup>\u22122<\/jats:sup>\u2009s<jats:sup>\u22121<\/jats:sup>). In addition, photosynthesis rates of all the snow algal communities responded strongly to increasing CO<jats:sub>2<\/jats:sub> levels. At current atmospheric CO<jats:sub>2<\/jats:sub> levels (420\u2009ppm), snow algal net photosynthesis rates were only <jats:italic>c.<\/jats:italic> 50% saturated.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Together, these results suggest the primary productivity of important bloom\u2010forming snow algal communities in alpine ecosystems will likely rise as atmospheric CO<jats:sub>2<\/jats:sub> concentrations increase, regardless of potential changes in available light levels.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p>","DOI":"10.1111\/nph.70332","type":"journal-article","created":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T01:54:21Z","timestamp":1751421261000},"page":"2074-2085","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Elevated light and <scp>CO<sub>2<\/sub><\/scp> levels increase photosynthetic rates of diverse snow algal communities from the North 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