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dc.contributor.authorAbell, Jonathan Michael
dc.contributor.authorÖzkundakci, Deniz
dc.contributor.authorHamilton, David P.
dc.contributor.authorJones, John R.
dc.date.accessioned2012-10-25T19:53:06Z
dc.date.available2012-10-25T19:53:06Z
dc.date.copyright2012-06-01
dc.date.issued2012
dc.identifier.citationAbell, J. M., Özkundakci, D., Hamilton, D. P., & Jones, J. R. (2012). Latitudinal variation in nutrient stoichiometry and chlorophyll-nutrient relationships in lakes: A global study. Fundamental and Applied Limnology / Archiv für Hydrobiologie, 181(1), 1-14.en_NZ
dc.identifier.issn1863-9135
dc.identifier.urihttps://hdl.handle.net/10289/6744
dc.description.abstractWe present analysis of variations in relationships between nitrogen (N), phosphorus (P) and chlorophyll-a (chl-a) in lakes along a gradient of latitude inclusive of tropical, temperate and polar regions. Total nitrogen (TN), total phosphorus (TP), chl-a, latitude and depth data were collated for 1316 lakes situated between 70 degrees S and 83 N. Latitudinal variation was then analysed for three empirical measures of phytoplankton nutrient limitation and/or nutrient assimilation. Lastly, chl-a near-maxima conditional on TN and TP abundance were empirically defined for this global dataset using quantile regression. Mean TN:TP increases with distance from the equator. This relationship is independent of variation in either lake depth or trophic state, reflecting latitudinal variation in nutrient cycling processes and/or nutrient sources. There is a negative linear relationship between latitude and chl-a:TN which similarly suggests that N is less abundant relative to phytoplankton growth requirements at lower latitudes. Relative to temperate lakes, the statistical capability of TN and TP to predict chl-a is poor for both tropical and polar lakes, reflecting latitudinal variation in lake ecosystem functioning and the subsequent potential unsuitability of applying relationships derived for temperate lakes elsewhere. Chl-a near-maxima correspond to chl-a:TN and chl-a:TP yields of 0.046:1 and 0.87:1 respectively, although some observations greatly exceed near-maxima, suggesting possible physiologically plastic phytoplankton responses in these exceptional cases. Deficiencies in understanding the mechanisms that drive variation in macro-nutrient stoichiometry and phytoplankton biomass-nutrient relationships across large spatial scales necessitates further landscape-scale research on this topic, particularly in the tropics.en_NZ
dc.language.isoen
dc.publisherSchweizerbart und Borntraegeren_NZ
dc.relation.ispartofFundamental and Applied Limnology / Archiv für Hydrobiologie
dc.subjectEutrophicationen_NZ
dc.subjectNitrogenen_NZ
dc.subjectnutrient limitationen_NZ
dc.subjectphosphorusen_NZ
dc.subjectphytoplanktonen_NZ
dc.subjectpolaren_NZ
dc.subjectquantile regressionen_NZ
dc.subjecttropicalen_NZ
dc.titleLatitudinal variation in nutrient stoichiometry and chlorophyll-nutrient relationships in lakes: A global studyen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1127/1863-9135/2012/0272en_NZ
dc.relation.isPartOfFundamental and Applied Limnologyen_NZ
pubs.begin-page1en_NZ
pubs.elements-id38122
pubs.end-page14en_NZ
pubs.issue1en_NZ
pubs.volume181en_NZ


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