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DatoValore
TitleRECENT TROPHIC CHANGES IN LAKE PUSIANO (NORTHERN ITALY) WITH PARTICULAR REFERENCE TO THE INFLUENCE OF HYDRODYNAMICS ON THE ZOOPLANKTON COMMUNITY
AbstractLake Pusiano (northern Italy) has been subjected for more than 20 yr to increasing eutrophication which caused hypereutrophic conditions in the mid-1980s. Due to the introduction of a sewage-treatment network in 1986, the total P concentration in the lake water dropped from 185 ?g l-1 in 1985 to 74 ?g l-1 in 2003. Although there was a reduction in nutrient load, cyanobacteria blooms were observed from 1994 onwards. The aim of this study was to compare physical and chemical parameters and the zooplankton community between two investigation periods (February-December 2002 and January 2003-February 2004) that were separated by an extreme flood event in November 2001 affecting the total plankton community. From the analysis of the data sampled in 2002-2003, an increase in transparency (from 3.5 m to 5.7 m) and a decrease in chlorophyll a concentration (from 6 ?g l-1 to 1.5 ?g l-1), both measured during the circulation period (December-February), were recorded. Within the phytoplankton, a shift from cyanobacteria to chlorophytes was detected. The zooplankton community changed in the composition of species, that is a higher number of species known to be less tolerant to toxic cyanobacteria were observed. The results emphasise that the flood event at the end of 2002 accelerated the process of reoligotrophication in the lake and contributed to an increased diversification of the zooplankton community. The generally increasing frequency of occurrence of flooding events following heavy rainfalls might be considered a major factor in regulating plankton community composition in the future.
SourceChemistry in ecology (Print) 22 (1), pp. 37–47
KeywordsZooplanktonTrophic changesFlood impact
JournalChemistry in ecology (Print)
EditorGordon and Breach Science Publishers., New York, Stati Uniti d'America
Year2006
TypeArticolo in rivista
DOI10.1080/02757540600557611
AuthorsMARGARITORA F.G., CHERUBINI E., COPETTI D., LEGNANI E., SEMINARA M., TARTARI G., VAGAGGINI D.
Text67699 2006 10.1080/02757540600557611 ISI Web of Science WOS 000241198700003 Scopus 2 s2.0 33748295528 Zooplankton Trophic changes Flood impact RECENT TROPHIC CHANGES IN LAKE PUSIANO NORTHERN ITALY WITH PARTICULAR REFERENCE TO THE INFLUENCE OF HYDRODYNAMICS ON THE ZOOPLANKTON COMMUNITY MARGARITORA F.G., CHERUBINI E., COPETTI D., LEGNANI E., SEMINARA M., TARTARI G., VAGAGGINI D. MARGARITORA F.G., CHERUBINI E., SEMINARA M., VAGAGGINI D. Dipartimento di Biologia Animale e Umana, Universita La Sapienza, Roma COPETTI D., LEGNANI E., TARTARI G. CNR IRSA U.O.S. Brugherio Lake Pusiano northern Italy has been subjected for more than 20 yr to increasing eutrophication which caused hypereutrophic conditions in the mid 1980s. Due to the introduction of a sewage treatment network in 1986, the total P concentration in the lake water dropped from 185 g l 1 in 1985 to 74 g l 1 in 2003. Although there was a reduction in nutrient load, cyanobacteria blooms were observed from 1994 onwards. The aim of this study was to compare physical and chemical parameters and the zooplankton community between two investigation periods February December 2002 and January 2003 February 2004 that were separated by an extreme flood event in November 2001 affecting the total plankton community. From the analysis of the data sampled in 2002 2003, an increase in transparency from 3.5 m to 5.7 m and a decrease in chlorophyll a concentration from 6 g l 1 to 1.5 g l 1 , both measured during the circulation period December February , were recorded. Within the phytoplankton, a shift from cyanobacteria to chlorophytes was detected. The zooplankton community changed in the composition of species, that is a higher number of species known to be less tolerant to toxic cyanobacteria were observed. The results emphasise that the flood event at the end of 2002 accelerated the process of reoligotrophication in the lake and contributed to an increased diversification of the zooplankton community. The generally increasing frequency of occurrence of flooding events following heavy rainfalls might be considered a major factor in regulating plankton community composition in the future. 22 http //www.tandfonline.com/doi/abs/10.1080/02757540600557611 Articolo pubblicato Margaritora_et_al_2006_ChemistryEcology.pdf Articolo in rivista Gordon and Breach Science Publishers. 0275 7540 Chemistry in ecology Print Chemistry in ecology Print Chem. ecol. Print Chemistry in ecology. Print Chemistry and ecology Print LEGNANI ELENA MARIA diego.copetti COPETTI DIEGO gianni.tartari TARTARI GIANNI TA.P02.014.001 Alterazioni ecosistemiche a livello funzionale e strutturale indotte da cambiamenti globali TA.P04.021.005 Tendenze evolutive della qualita dei corpi idrici superficiali e sotterranei correlazione causa effetto e caratterizzazione.