NDLI: Phytoplankton as an Indicator of the Water Quality of the Deep Lakes South of the Alps

Content Provider	Springer Nature Link
Author	Salmaso, Nico Morabito, Giuseppe Buzzi, Fabio Garibaldi, Letizia Simona, Marco Mosello, Rosario
Copyright Year	2006
Abstract	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.
Starting Page	167
Ending Page	187
Page Count	21
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	563
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-03-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	phytoplankton deep southern subalpine lakes trophic status phytoplankton trophic indices Water Framework Directive Ecology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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A synoptic study of phytoplankton in the deep lakes south of the Alps (lakes Garda, Iseo, Como, Lugano and Maggiore)

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Phytoplankton as an Indicator of the Water Quality of the Deep Lakes South of the Alps

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