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dc.contributor.authorPearson, Lisa Kyleen_NZ
dc.contributor.authorHendy, Chris H.en_NZ
dc.contributor.authorHamilton, David P.en_NZ
dc.date.accessioned2016-07-06T00:31:16Z
dc.date.available2016en_NZ
dc.date.available2016-07-06T00:31:16Z
dc.date.issued2016en_NZ
dc.identifier.citationPearson, L. K., Hendy, C. H., & Hamilton, D. P. (2016). Dynamics of silicon in lakes of the Taupo Volcanic Zone, New Zealand, and implications for diatom growth. Inland Waters, 6(2), 185–198. http://doi.org/10.5268/IW-6.2.813en
dc.identifier.issn2044-2041en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10510
dc.description.abstractIntact sediment cores were taken from the deepest basins of 9 lakes in the Taupo Volcanic Zone, New Zealand, to investigate the factors controlling silicon (Si) concentrations in sediment pore waters and the flux of Si to the overlying lake water. The lakes ranged in trophic state from oligotrophic to highly eutrophic. A Si vertical flux model simulated Si gradients in the pore water with high precision (r2 > 0.95, p < 0.01) in lakes with no volcanic tephra layers or significant geothermal inflows. The ubiquitous presence of diatom frustules in the sediment was likely responsible for release of Si to the pore waters and subsequent diffusion to overlying lake waters. Fluxes of Si were related to the trophic status of the lake and were greatest in eutrophic lakes where diatom populations reduced epilimnetic Si concentrations to <1 mg L-1. Temporal variations in the concentrations of Si, nitrogen (N), and phosphorus (P) suggest that over most of the year diatom growth in the oligotrophic lakes is limited by N, or co-limited by N and P. In some eutrophic lakes, Si may limit diatom growth during homothermal conditions, and P and/or N may limit growth when the lake is stratified. The reduction of surface Si concentrations to <0.1 mg L-1 following homothermy in some eutrophic lakes is likely to restrict the growth of diatoms, potentially resulting in increased dominance of nonsiliceous flagellated species and cyanobacteria.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherFreshwater Biological Assnen_NZ
dc.relation.urihttps://www.fba.org.uk/journals/index.php/IW/article/viewFile/813/551en_NZ
dc.rightsThis article has been published in the journal: Inland Waters. Used with permission.
dc.subjectcyanobacteriaen_NZ
dc.subjectdiatomen_NZ
dc.subjectdiffusionen_NZ
dc.subjecteutrophicationen_NZ
dc.subjectnitrogenen_NZ
dc.subjectphosphorusen_NZ
dc.subjectpore wateren_NZ
dc.titleDynamics of silicon in lakes of the Taupo Volcanic Zone, New Zealand, and implications for diatom growthen_NZ
dc.typeJournal Article
dc.identifier.doi10.5268/IW-6.2.813en_NZ
dc.relation.isPartOfInland Watersen_NZ
pubs.begin-page185
pubs.elements-id138780
pubs.end-page198
pubs.issue2en_NZ
pubs.volume6en_NZ
dc.identifier.eissn2044-205Xen_NZ


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