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 Chironomidae larvae as bioindicators of an acid mine drainage in Portugal
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5428

title: Chironomidae larvae as bioindicators of an acid mine drainage in Portugal
authors: Bisthoven, L. Janssens de
Gerhardt, A.
Soares, A. M. V. M.
keywords: Chironomidae
Bioindication
Acid mine drainage
Community
Deformities
issue date: 2005
publisher: Springer Verlag
abstract: The abandoned Sao Domingos mine in South Portugal discharges acid metal pollution in the drainage system. A dynamic pH- and metal-gradient (pH 3.3-6.8) modulated by rainfall at the confluence of a tributary with the acid mine drainage (AMD)-channel, and a small reservoir contaminated with arsenic were sampled for Chironomidae in three different seasons and compared with a control river, to test whether this insect family is sensitive to AMD-pollution and arsenic. The AMD sites contained 18-22 taxa, compared to 22 taxa in the reservoir and 25 taxa in the control site. The chironomid fauna in the AMD was characterised by a high proportion of Chironominae and predatory Tanypodinae, and a low proportion of Orthocladiinae, these subfamilies being useful and easy bioindicators for AMD. The presence of morphological deformities in Ablabesmyia monilis and Procladius sp. is a potential bioindication of AMD but due to low numbers of larvae, it was of limited use. Despite high arsenic levels in the water, the small reservoir contained many taxa forming a typical lentic community.
URI: http://hdl.handle.net/10773/5428
ISSN: 0018-8158
source: Hydrobiologia
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