Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.

To identify the seasonal pattern of nitrogen (N) and phosphorus (P) limitation of phytoplankton in four different lakes, biweekly experiments were conducted from the end of March to September 2011. Lake water samples were enriched with N, P or both nutrients and incubated under two different light i...

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Autores principales:	Sebastian Kolzau, Claudia Wiedner, Jacqueline Rücker, Jan Köhler, Antje Köhler, Andrew M Dolman
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/819353a731e84c2eb8a02720f7a85870
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spelling	oai:doaj.org-article:819353a731e84c2eb8a02720f7a858702021-11-18T08:21:54ZSeasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.1932-620310.1371/journal.pone.0096065https://doaj.org/article/819353a731e84c2eb8a02720f7a858702014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24755935/?tool=EBIhttps://doaj.org/toc/1932-6203To identify the seasonal pattern of nitrogen (N) and phosphorus (P) limitation of phytoplankton in four different lakes, biweekly experiments were conducted from the end of March to September 2011. Lake water samples were enriched with N, P or both nutrients and incubated under two different light intensities. Chlorophyll a fluorescence (Chla) was measured and a model selection procedure was used to assign bioassay outcomes to different limitation categories. N and P were both limiting at some point. For the shallow lakes there was a trend from P limitation in spring to N or light limitation later in the year, while the deep lake remained predominantly P limited. To determine the ability of in-lake N:P ratios to predict the relative strength of N vs. P limitation, three separate regression models were fit with the log-transformed ratio of Chla of the P and N treatments (Response ratio = RR) as the response variable and those of ambient total phosphorus:total nitrogen (TN:TP), dissolved inorganic nitrogen:soluble reactive phosphorus (DIN:SRP), TN:SRP and DIN:TP mass ratios as predictors. All four N:P ratios had significant positive relationships with RR, such that high N:P ratios were associated with P limitation and low N:P ratios with N limitation. The TN:TP and DIN:TP ratios performed better than the DIN:SRP and TN:SRP in terms of misclassification rate and the DIN:TP ratio had the highest R₂ value. Nitrogen limitation was predictable, frequent and persistent, suggesting that nitrogen reduction could play a role in water quality management. However, there is still uncertainty about the efficacy of N restriction to control populations of N₂ fixing cyanobacteria.Sebastian KolzauClaudia WiednerJacqueline RückerJan KöhlerAntje KöhlerAndrew M DolmanPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 4, p e96065 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sebastian Kolzau Claudia Wiedner Jacqueline Rücker Jan Köhler Antje Köhler Andrew M Dolman Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
description	To identify the seasonal pattern of nitrogen (N) and phosphorus (P) limitation of phytoplankton in four different lakes, biweekly experiments were conducted from the end of March to September 2011. Lake water samples were enriched with N, P or both nutrients and incubated under two different light intensities. Chlorophyll a fluorescence (Chla) was measured and a model selection procedure was used to assign bioassay outcomes to different limitation categories. N and P were both limiting at some point. For the shallow lakes there was a trend from P limitation in spring to N or light limitation later in the year, while the deep lake remained predominantly P limited. To determine the ability of in-lake N:P ratios to predict the relative strength of N vs. P limitation, three separate regression models were fit with the log-transformed ratio of Chla of the P and N treatments (Response ratio = RR) as the response variable and those of ambient total phosphorus:total nitrogen (TN:TP), dissolved inorganic nitrogen:soluble reactive phosphorus (DIN:SRP), TN:SRP and DIN:TP mass ratios as predictors. All four N:P ratios had significant positive relationships with RR, such that high N:P ratios were associated with P limitation and low N:P ratios with N limitation. The TN:TP and DIN:TP ratios performed better than the DIN:SRP and TN:SRP in terms of misclassification rate and the DIN:TP ratio had the highest R₂ value. Nitrogen limitation was predictable, frequent and persistent, suggesting that nitrogen reduction could play a role in water quality management. However, there is still uncertainty about the efficacy of N restriction to control populations of N₂ fixing cyanobacteria.
format	article
author	Sebastian Kolzau Claudia Wiedner Jacqueline Rücker Jan Köhler Antje Köhler Andrew M Dolman
author_facet	Sebastian Kolzau Claudia Wiedner Jacqueline Rücker Jan Köhler Antje Köhler Andrew M Dolman
author_sort	Sebastian Kolzau
title	Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
title_short	Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
title_full	Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
title_fullStr	Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
title_full_unstemmed	Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.
title_sort	seasonal patterns of nitrogen and phosphorus limitation in four german lakes and the predictability of limitation status from ambient nutrient concentrations.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/819353a731e84c2eb8a02720f7a85870
work_keys_str_mv	AT sebastiankolzau seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations AT claudiawiedner seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations AT jacquelinerucker seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations AT jankohler seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations AT antjekohler seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations AT andrewmdolman seasonalpatternsofnitrogenandphosphoruslimitationinfourgermanlakesandthepredictabilityoflimitationstatusfromambientnutrientconcentrations
_version_	1718421869716045824

Seasonal patterns of nitrogen and phosphorus limitation in four German lakes and the predictability of limitation status from ambient nutrient concentrations.

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