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Collectively, DOP represents an important nutritional phosphorus (P) source for phytoplankton growth in the ocean, but the contribution of specific DOP sources to microbial community P demand is not fully understood. In a prior study, it was reported that inorganic polyphosphate was not bioavailable to the model diatoms\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Thalassiosira weissflogii<\/jats:italic>\n                    <\/jats:styled-content>\n                    and\n                    <jats:styled-content style=\"fixed-case\">\n                      <jats:italic>Thalassiosira pseudonana<\/jats:italic>\n                    <\/jats:styled-content>\n                    . However, in this study, we show that the previous finding was a misinterpretation based on a technical artefact of media preparation and that inorganic polyphosphate is actually widely bioavailable to\n                    <jats:italic>Thalassiosira<\/jats:italic>\n                    spp. In fact, orthophosphate, inorganic tripolyphosphate (3polyP), adenosine triphosphate (ATP) and adenosine monophosphate supported equivalent growth rates and final growth yields within each of four strains of\n                    <jats:italic>Thalassiosira<\/jats:italic>\n                    spp. However, enzyme activity assays revealed in all cultures that cell\u2010associated hydrolysis rates of 3polyP were typically more than ~10\u2010fold higher than degradation of ATP and the model phosphomonoester compound 4\u2010methylumbelliferyl phosphate. These results build on prior work, which showed the preferential utilization of polyphosphates in the cell\u2010free exudates of\n                    <jats:italic>Thalassiosira<\/jats:italic>\n                    spp., and suggest that inorganic polyphosphates may be a key bioavailable source of P for marine phytoplankton.\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.14630","type":"journal-article","created":{"date-parts":[[2019,4,11]],"date-time":"2019-04-11T20:27:39Z","timestamp":1555014459000},"page":"2415-2425","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Preferential utilization of inorganic polyphosphate over other bioavailable phosphorus sources by the model diatoms\n                    <i>Thalassiosira<\/i>\n                    spp."],"prefix":"10.1111","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0732-5564","authenticated-orcid":false,"given":"Julia 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