Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients

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dc.contributor.authorMoschonas, Grigorios
dc.contributor.authorGowen, Richard J.
dc.contributor.authorPaterson, Ruth F.
dc.contributor.authorMitchell, Elaine
dc.contributor.authorStewart, Brian M.
dc.contributor.authorMcNeill, Sharon
dc.contributor.authorGlibert, Patricia M.
dc.contributor.authorDavidson, Keith
dc.date.accessioned2021-07-16T10:02:07Z
dc.date.available2021-07-16T10:02:07Z
dc.date.issued2017-06-15
dc.descriptionPublication history: Accepted - 7 June 2017; Published online - 15 June 2017.en_US
dc.description.abstractDissolved organic nitrogen (DON) is recognised as an important N source for phytoplankton. However, its relative importance for phytoplankton nutrition and community composition has not been studied comprehensively. This study, conducted in a typical Scottish fjord, representative of nearpristine coastal environments, evaluates the utilisation of DON and dissolved inorganic nitrogen (DIN) by different microbial size fractions and the relationship of phytoplankton community composition with DON and other parameters. The study demonstrated that DON was important in supporting phytoplankton throughout the yearly production cycle. The higherthan-expected urea uptake rates and large fraction of the spring bloom production supported by DON suggested that organic N not only contributes to regenerated production and to the nutrition of the small phytoplankton fraction, but can also contribute substantially to new production of the larger phytoplankton in coastal waters. Multivariate statistical techniques revealed two phytoplankton assemblages with peaks in abundance at different times of the year: a spring group dominated by Skeletonema spp., Thalassiosira spp., and Pseudo-nitzschia spp. group delicatissima; and a summer/autumn group dominated by Chaetoceros spp., Scrippsiella spp., and Pseudonitzschia spp. group seriata. The multivariate pattern in community composition and abundance of these taxa was significantly correlated with the multivariate pattern of DON, urea, dissolved free amino acids, DIN, temperature, salinity, and daylength, with daylength and urea being particularly important, suggesting both physical and chemical controls on community composition.en_US
dc.description.sponsorshipThe authors wish to acknowledge the National Environment Research Council (NERC) for funding and the officers and crew of RV Seòl Mara for assisting with sample collection. This is contribution number 5318 from the University of Maryland Center for Environmental Science.en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/316
dc.identifier.citationMoschonas, G., Gowen, R. J., Paterson, R. F., Mitchell, E., Stewart, B. M., McNeill, S., Glibert, P. M. and Davidson, K. (2017) ‘Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients’, Biogeochemistry, 134(1–2), pp. 125–145. doi: 10.1007/s10533-017-0351-8.en_US
dc.identifier.issn0168-2563
dc.identifier.issn1573-515X
dc.identifier.urihttps://doi.org/10.1007/s10533-017-0351-8
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.rightsOpen Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.en_US
dc.subjectDissolved organic nitrogenen_US
dc.subjectPhytoplanktonen_US
dc.subjectNitrogen uptakeen_US
dc.subjectCommunity compositionen_US
dc.titleNitrogen dynamics and phytoplankton community structure: the role of organic nutrientsen_US
dc.typeArticleen_US
dcterms.dateAccepted2017-06-07
dcterms.dateSubmitted2016-09-26

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