dc.contributor.author | Abell, Jonathan Michael | |
dc.contributor.author | Özkundakci, Deniz | |
dc.contributor.author | Hamilton, David P. | |
dc.contributor.author | Jones, John R. | |
dc.date.accessioned | 2012-10-25T19:53:06Z | |
dc.date.available | 2012-10-25T19:53:06Z | |
dc.date.copyright | 2012-06-01 | |
dc.date.issued | 2012 | |
dc.identifier.citation | Abell, 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.issn | 1863-9135 | |
dc.identifier.uri | https://hdl.handle.net/10289/6744 | |
dc.description.abstract | We 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.iso | en | |
dc.publisher | Schweizerbart und Borntraeger | en_NZ |
dc.relation.ispartof | Fundamental and Applied Limnology / Archiv für Hydrobiologie | |
dc.subject | Eutrophication | en_NZ |
dc.subject | Nitrogen | en_NZ |
dc.subject | nutrient limitation | en_NZ |
dc.subject | phosphorus | en_NZ |
dc.subject | phytoplankton | en_NZ |
dc.subject | polar | en_NZ |
dc.subject | quantile regression | en_NZ |
dc.subject | tropical | en_NZ |
dc.title | Latitudinal variation in nutrient stoichiometry and chlorophyll-nutrient relationships in lakes: A global study | en_NZ |
dc.type | Journal Article | en_NZ |
dc.identifier.doi | 10.1127/1863-9135/2012/0272 | en_NZ |
dc.relation.isPartOf | Fundamental and Applied Limnology | en_NZ |
pubs.begin-page | 1 | en_NZ |
pubs.elements-id | 38122 | |
pubs.end-page | 14 | en_NZ |
pubs.issue | 1 | en_NZ |
pubs.volume | 181 | en_NZ |