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dc.contributor.authorDiaz, Julia M.  Concept link
dc.contributor.authorBjörkman, Karin M.  Concept link
dc.contributor.authorHaley, Sheean T.  Concept link
dc.contributor.authorIngall, Ellery  Concept link
dc.contributor.authorKarl, David M.  Concept link
dc.contributor.authorLongo, Amelia  Concept link
dc.contributor.authorDyhrman, Sonya T.  Concept link
dc.date.accessioned2016-12-01T19:19:04Z
dc.date.available2016-12-01T19:19:04Z
dc.date.issued2015-10-27
dc.identifier.citationLimnology and Oceanography 61 (2016): 227–239en_US
dc.identifier.urihttps://hdl.handle.net/1912/8567
dc.descriptionAuthor Posting. © Association for the Sciences of Limnology and Oceanography, 2015. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 61 (2016): 227–239, doi:10.1002/lno.10206.en_US
dc.description.abstractPolyphosphate (polyP) was examined within the upper water column (≤ 150 m) of Station ALOHA (22° 45′N, 158° 00′W) during two cruises conducted in May–June 2013 and September 2013. Phosphorus molar ratios of particulate polyP to total particulate phosphorus (TPP) were relatively low, similar to previously reported values from the temperate western North Atlantic, and did not exhibit strong vertical gradients, reflecting a lack of polyP recycling relative to other forms of TPP with depth. Furthermore, relationships among polyP:TPP, soluble reactive phosphorus (SRP), and alkaline phosphatase activity (APA) were also consistent with previous observations from the Atlantic Ocean. To ascertain potential mechanisms of biological polyP production and utilization, surface seawater was incubated following nutrient additions. Results were consistent with polyP:TPP enrichment under opposite extremes of APA, suggesting diverse polyP accumulation/retention mechanisms. Addition of exogenous polyP (45 ± 5 P atoms) to field incubations did not increase chlorophyll content relative to controls, suggesting that polyP was not bioavailable to phytoplankton at Station ALOHA. To clarify this result, phytoplankton cultures were screened for the ability to utilize exogenous polyP. PolyP bioavailability was variable among model diatoms of the genus Thalassiosira, yet chain length did not influence polyP bioavailability. Thus, microbial community composition may influence polyP dynamics in the ocean, and vice versa.en_US
dc.description.sponsorshipThis work was supported by a Postdoctoral Fellowship from the Ford Foundation (JMD), the National Science Foundation under grants OCE 1225801 (JMD), OCE 1316036 (STD), EF 04-24599 (DMK), the Woods Hole Oceanographic Coastal Ocean Institute, the Center for Microbial Oceanography: Research and Education, and the Gordon and Betty Moore Foundation (DMK). Additional support was provided by grants from the Simons Foundation to DMK and STD.en_US
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/lno.10206
dc.titlePolyphosphate dynamics at Station ALOHA, North Pacific subtropical gyreen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/lno.10206


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