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Induction of atrazine tolerance in a natural soil assemblage of microalgae reared in the laboratory.

Abstract：

:We investigated the occurrence of tolerance to atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) in soil microalgae by means of the pollution-induced community tolerance methodology. To this end, a natural soil assemblage of microalgae, reared under laboratory conditions, was used as experimental model. Experimental cultures were exposed to 0.46, 0.93, 1.85, 2.70, and 5.40 mg atrazine/L medium for 40 days. After this chronic exposure, both untreated and atrazine-pretreated cultures were subjected to a short-term dose-effect study with atrazine using average growth rate as endpoint. Results showed that chronic exposure to atrazine induced significant changes at the community level, increasing its atrazine tolerance. In addition, atrazine-pretreated assemblages seemed to display, on average, a reduced growth rate compared with untreated assemblages in the absence of atrazine. Response to the presence of atrazine could thus be achieved with some fitness cost. This suggests that the soil microalgal productivity could be diminished after exposure to atrazine.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

García-Villada L,Reboud X

doi

10.1016/j.ecoenv.2005.09.003

keywords:

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

102-6

issue

1

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(05)00226-5

journal_volume

66

pub_type

杂志文章

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