Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997

Lake Riñihue is the last in a chain of glacially derived oligotrophic lakes in southern Chile and was the subject of limnological research by Dr. Hugo Campos and co-workers at the Universidad Austral de Chile, Valdivia, Chile, since the 1970's. Prof. Campos died in the field in 1998, and this p...

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Autores principales:	WOELFL,STEFAN, VILLALOBOS,LORENA, PARRA,ÓSCAR
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2003
Materias:	eutrophication north Patagonian lake nutrients trophy analytical methods
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300010
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spelling	oai:scielo:S0716-078X20030003000102003-12-17Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997WOELFL,STEFANVILLALOBOS,LORENAPARRA,ÓSCAR eutrophication north Patagonian lake nutrients trophy analytical methods Lake Riñihue is the last in a chain of glacially derived oligotrophic lakes in southern Chile and was the subject of limnological research by Dr. Hugo Campos and co-workers at the Universidad Austral de Chile, Valdivia, Chile, since the 1970's. Prof. Campos died in the field in 1998, and this paper now presents a review of these data with comments on methodology relevant to trophic parameters of this lake. Data are presented on inorganic nutrients, chlorophyll a, phytoplankton biomass, primary production and Secchi depth obtained over a period of 21 years between 1978 and 1997 in order to evaluate potential changes in these parameters over time. Non-parametric Wilcoxon rank sum tests were applied to determine temporal trends and revealed: (1) total phosphorus showed a significant increase (TP: 2.7 mg P L-1 to 6.5 mg P L-1), (2) Secchi depth, soluble reactive phosphorus and primary production did not change significantly, (3) chlorophyll a changed significantly among different years, but did not reveal a clear temporal trend, (4) nitrate showed an upward trend and increased concentrations during the early 1990 period, although this data remain in doubt due to methodological anomalies, and (5) the phytoplankton biomass showed significantly higher values during the 1980 period. The significant increase in total phosphorus may reflect increasing usage of grassland within the catchment area. A number of anomalies discovered in historical data sets related to methodology are analysed and discussed within the context of the study.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.76 n.3 20032003-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300010en10.4067/S0716-078X2003000300010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	eutrophication north Patagonian lake nutrients trophy analytical methods
spellingShingle	eutrophication north Patagonian lake nutrients trophy analytical methods WOELFL,STEFAN VILLALOBOS,LORENA PARRA,ÓSCAR Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
description	Lake Riñihue is the last in a chain of glacially derived oligotrophic lakes in southern Chile and was the subject of limnological research by Dr. Hugo Campos and co-workers at the Universidad Austral de Chile, Valdivia, Chile, since the 1970's. Prof. Campos died in the field in 1998, and this paper now presents a review of these data with comments on methodology relevant to trophic parameters of this lake. Data are presented on inorganic nutrients, chlorophyll a, phytoplankton biomass, primary production and Secchi depth obtained over a period of 21 years between 1978 and 1997 in order to evaluate potential changes in these parameters over time. Non-parametric Wilcoxon rank sum tests were applied to determine temporal trends and revealed: (1) total phosphorus showed a significant increase (TP: 2.7 mg P L-1 to 6.5 mg P L-1), (2) Secchi depth, soluble reactive phosphorus and primary production did not change significantly, (3) chlorophyll a changed significantly among different years, but did not reveal a clear temporal trend, (4) nitrate showed an upward trend and increased concentrations during the early 1990 period, although this data remain in doubt due to methodological anomalies, and (5) the phytoplankton biomass showed significantly higher values during the 1980 period. The significant increase in total phosphorus may reflect increasing usage of grassland within the catchment area. A number of anomalies discovered in historical data sets related to methodology are analysed and discussed within the context of the study.
author	WOELFL,STEFAN VILLALOBOS,LORENA PARRA,ÓSCAR
author_facet	WOELFL,STEFAN VILLALOBOS,LORENA PARRA,ÓSCAR
author_sort	WOELFL,STEFAN
title	Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
title_short	Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
title_full	Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
title_fullStr	Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
title_full_unstemmed	Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
title_sort	trophic parameters and method validation in lake riñihue (north patagonia: chile) from 1978 through 1997
publisher	Sociedad de Biología de Chile
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300010
work_keys_str_mv	AT woelflstefan trophicparametersandmethodvalidationinlakerinihuenorthpatagoniachilefrom1978through1997 AT villaloboslorena trophicparametersandmethodvalidationinlakerinihuenorthpatagoniachilefrom1978through1997 AT parraoscar trophicparametersandmethodvalidationinlakerinihuenorthpatagoniachilefrom1978through1997
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Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997

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