Biological quality assessment of the Garonne River with special reference to chironomid and diatom indices

The diatoms of the epilithon and the benthic chironomids were used to assess the impacts of pollution of the Garonne river by a paper-mill effluent (Saint Gaudens) and by domestic and industrial wastewaters (Toulouse). The chironomid index (ICh) is more permanent in time and seems to reflect the med...

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Bibliographic Details
Published in:Annales de limnologie 1993-01, Vol.29 (3-4), p.269-279
Main Authors: Eulin, A, Gruarin, C, Laville, H, Le Cohu, R
Format: Article
Language:fre
Subjects:
Bacillariophyceae
Chironomidae
Diptera
Freshwater
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Summary:The diatoms of the epilithon and the benthic chironomids were used to assess the impacts of pollution of the Garonne river by a paper-mill effluent (Saint Gaudens) and by domestic and industrial wastewaters (Toulouse). The chironomid index (ICh) is more permanent in time and seems to reflect the medium global quality of the river. The diatom index (IPS) fluctuates in time and reflects more exactly the pin-point impacts of pollution. The IPS mean values are a little higher than the ICh values but these two indices reflect similarly the alteration of water quality. Other biological measures have to be considered for a more exact valuation of the quality of the lotic systems.
ISSN:0003-4088
DOI:10.1051/limn/1993022