DSpace
 
  Repositório Institucional da Universidade de Aveiro > Departamento de Biologia > BIO - Artigos >
 Phytoassessment of acid mine drainage: Lemna gibba bioassay and diatom community structure
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5463

title: Phytoassessment of acid mine drainage: Lemna gibba bioassay and diatom community structure
authors: Gerhardt, A.
de Bisthoven, L. J.
Guhr, K.
Soares, A. M. V. M.
Pereira, M. J.
keywords: Phytoassessment
Phytotoxicity
Lemna
Diatoms
Acid mine drainage
Acidity
Multimetric index
issue date: 2008
publisher: Springer Verlag
abstract: An integrated multilevel phytoassessment of an acid mine drainage (AMD, pH range 3.3-6.8) in southern Portugal was performed. A 7-day phytotoxicity bioassay with the duckweed Lemna gibba (chlorosis, necrosis, growth) was carried out, both in the laboratory and in situ, combined with an analysis of the resident epilithic diatom community. The toxicity test was performed with water from the AMD gradient, an unpolluted river control and acidified control water, in order to discriminate potential pH-effects from combined pH- and metal-effects. Diatom communities discriminated well among the sites (alkalophilic species versus halobiontic, acidobiontic and acidophilic species), showing inter-site differences to be larger than intra-site seasonal variations. In L. gibba exposed to AMD, necrosis and growth inhibition were higher in situ compared to the laboratory experiments. L. gibba was more sensitive to AMD than to acidified water. Already after 4 days, growth rate inhibition in L. gibba proved to be a reliable indicator of AMD-stress. Ecotoxicological thresholds obtained with L. gibba corresponded with those obtained previously with animals of intermediate tolerance to AMD. The results were summarised in a multimetric index.
URI: http://hdl.handle.net/10773/5463
ISSN: 0963-9292
source: Ecotoxicology
appears in collectionsBIO - Artigos

files in this item

file description sizeformat
147_Ecotox_2008_17_47.pdf378.54 kBAdobe PDFview/open
Restrict Access. You can Request a copy!
statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! RCAAP OpenAIRE DeGóis
ria-repositorio@ua.pt - Copyright ©   Universidade de Aveiro - RIA Statistics - Powered by MIT's DSpace software, Version 1.6.2