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A metagenome analysis allowed the identification of the most abundant heterotrophic bacteria of the phycosphere, but the isolation of additional strains showed that metagenomics underestimated the complexity of the algal microbiome, However, a culture\u2010independent approach revealed the presence of a planctomycete that likely represents a novel bacterial family. We analysed algal and bacterial volatiles by open\u2010system\u2010stripping analysis (OSSA) on Tenax TA desorption tubes, followed by thermodesorption, cryofocusing and GC\u2010MS\u2010analysis. The analyses of the alga and the abundant bacterial strains <jats:italic>Sphingopyxis litoris<\/jats:italic> A01A\u2010101, <jats:italic>Algihabitans albus<\/jats:italic> A01A\u2010324, <jats:italic>\u201cCoraliitalea coralii\u201d<\/jats:italic> A01A\u2010333 and <jats:italic>Litoreibacter<\/jats:italic> sp. A01A\u2010347 revealed sulfur\u2010 and nitrogen\u2010containing compounds, ketones, alcohols, aldehydes, aromatic compounds, amides and one lactone, as well as the typical algal products, apocarotenoids. The compounds were identified by gas chromatographic retention indices, comparison of mass spectra and syntheses of reference compounds. A major algal metabolite was 3,4,4\u2010trimethylcyclopent\u20102\u2010en\u20101\u2010one, an apocarotenoid indicating the presence of carotenoids related to capsanthin, not reported from algae so far. A low overlap in volatiles bouquets between <jats:italic>C.\u2005velia<\/jats:italic> and the bacteria was found, and the xenic algal culture almost exclusively released algal components.<\/jats:p>","DOI":"10.1002\/cbic.202200530","type":"journal-article","created":{"date-parts":[[2022,11,22]],"date-time":"2022-11-22T04:15:17Z","timestamp":1669090517000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Volatiles of the Apicomplexan Alga <i>Chromera velia<\/i> and Associated Bacteria"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9266-4848","authenticated-orcid":false,"given":"Diana","family":"Koteska","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Organische Chemie Technische Universit\u00e4t Braunschweig  Hagenring 30 38106 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pia","family":"Marter","sequence":"additional","affiliation":[{"name":"Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH  Inhoffenstra\u00dfe 7B 38124 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sixing","family":"Huang","sequence":"additional","affiliation":[{"name":"Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH  Inhoffenstra\u00dfe 7B 38124 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7925-9976","authenticated-orcid":false,"given":"Silke","family":"Pradella","sequence":"additional","affiliation":[{"name":"Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH  Inhoffenstra\u00dfe 7B 38124 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6223-5575","authenticated-orcid":false,"given":"J\u00f6rn","family":"Petersen","sequence":"additional","affiliation":[{"name":"Leibniz-Institut DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH  Inhoffenstra\u00dfe 7B 38124 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4810-324X","authenticated-orcid":false,"given":"Stefan","family":"Schulz","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Organische Chemie Technische Universit\u00e4t Braunschweig  Hagenring 30 38106 Braunschweig Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,12,20]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature06635"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1550-7408.2012.00644.x"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1003335107"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1093\/gbe\/evu043"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-12-407672-3.00004-6"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.3390\/md17110640"},{"key":"e_1_2_7_7_1","first-page":"165","volume":"13","author":"Jin E.-S.","year":"2003","journal-title":"J. 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