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DatoValore
TitlePhytoplankton as an indicator of the water quality of the deep lakes south of the Alps
AbstractThis paper offers a synoptic account of studies on the phytoplankton communities in the deep southern subalpine lakes (DSL) Garda, Iseo, Como, Lugano and Maggiore. The main cause of the degradation of the water quality in the DSL is eutrophication. The euphotic layers of these lakes are trophically different, ranging from the oligo-mesotrophy of lakes Maggiore and Garda to the meso-eutrophy of lakes Iseo and Lugano. The trophic status as estimated by using total phosphorus and chlorophyll a has provided consistent results in agreement with the models proposed by OECD (1982. Eutrophication of Waters. Monitoring, Assessment and Control, OECD, Paris). Though related with chlorophyll a and TP, the Secchi disk depths have significantly underestimated the trophic status of the DSL. Two trophic indices using the algal orders (PTIorders) and species (PTIspecies) were drawn up on the basis of the distribution of phytoplankton along a trophic gradient defined by the application of multivariate methods; the scores emerging from these indices were used to make a definitive ecological classification of water bodies on a scale from 1 to 5, in accordance with the Water Framework Directive. A third index (PTIOE) was computed as the ratio between the annual mean values of the cumulative biovolumes of two groups of algal orders with opposite trophic characteristics. The three PTI indices were highly correlated, providing a consistent classification of the water bodies. The indices proposed in this work were specifically adopted for use in the DSL. However, the criteria for their implementation constitute a robust and impartial tool for assessing similar indices in other lake typologies and for evaluating the degree of specificity of the trophic indicator values assigned to the single phytoplankton orders and species.
SourceHydrobiologia (The Hague. Print) 563, pp. 167–187
Keywordsphytoplanktondeep southern subalpine lakesphytoplankton trophic indicesWater Framework Directive
JournalHydrobiologia (The Hague. Print)
EditorKluwer Academic Publishers, Boston, Paesi Bassi
Year2006
TypeArticolo in rivista
AuthorsSalmaso N.(1), Morabito G., Buzzi F.(2), Garibaldi L.(3), Simona M.(4), Mosello R.
Text52923 2006 ISI Web of Science WOS 000237552100014 phytoplankton deep southern subalpine lakes phytoplankton trophic indices Water Framework Directive Phytoplankton as an indicator of the water quality of the deep lakes south of the Alps Salmaso N. 1 , Morabito G., Buzzi F. 2 , Garibaldi L. 3 , Simona M. 4 , Mosello R. 1 Istituto Agrario San Michele all Adige; 2 ARPA, Lecco; 3 Universita di Milano Bicocca; 4 Sezione Protezione Aria, Acqua, Suolo, Bellinzona CH This paper offers a synoptic account of studies on the phytoplankton communities in the deep southern subalpine lakes DSL Garda, Iseo, Como, Lugano and Maggiore. The main cause of the degradation of the water quality in the DSL is eutrophication. The euphotic layers of these lakes are trophically different, ranging from the oligo mesotrophy of lakes Maggiore and Garda to the meso eutrophy of lakes Iseo and Lugano. The trophic status as estimated by using total phosphorus and chlorophyll a has provided consistent results in agreement with the models proposed by OECD 1982. Eutrophication of Waters. Monitoring, Assessment and Control, OECD, Paris . Though related with chlorophyll a and TP, the Secchi disk depths have significantly underestimated the trophic status of the DSL. Two trophic indices using the algal orders PTIorders and species PTIspecies were drawn up on the basis of the distribution of phytoplankton along a trophic gradient defined by the application of multivariate methods; the scores emerging from these indices were used to make a definitive ecological classification of water bodies on a scale from 1 to 5, in accordance with the Water Framework Directive. A third index PTIOE was computed as the ratio between the annual mean values of the cumulative biovolumes of two groups of algal orders with opposite trophic characteristics. The three PTI indices were highly correlated, providing a consistent classification of the water bodies. The indices proposed in this work were specifically adopted for use in the DSL. However, the criteria for their implementation constitute a robust and impartial tool for assessing similar indices in other lake typologies and for evaluating the degree of specificity of the trophic indicator values assigned to the single phytoplankton orders and species. 563 Articolo pubblicato Salmaso_et_al_2006_Hydrobiologia_563_167_187.pdf Articolo in rivista Kluwer Academic Publishers 0018 8158 Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia The Hague. Print Hydrobiologia. The Hague. Print Hydrobiologia Dordrecht The Hague. Print Hydrobiologia Boston The Hague. Print Hydrobiologia London The Hague. Print giuseppe.morabito MORABITO GIUSEPPE rosario.mosello MOSELLO ROSARIO TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici