Publication: Gill alterations as biomarkers of chronic exposure to endosulfan in Bufo bufo tadpoles
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Date
2010
Authors
Brunelli, Elvira ; Bernabò, Ilaria ; Sperone, Emilio ; Tripepi, Sandro
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Endosulfan sprayed on agricultural fields
accumulates in temporary pools due to surface runoff or
sediment transport and may result in high water
concentrations in spring and summer, coinciding with
breeding and crucial stages of amphibian larval
development. In the present study, Bufo bufo tadpoles
were exposed to three different concentrations of
endosulfan (0.01, 0.05 and 0.1 mg/L) until they reached
complete metamorphosis. The aim of the study was to
investigate the effects of endosulfan, at environmentally
relevant concentrations on gill morphology and
ultrastructure.
Modifications in ultrastructure and cell composition
were observed at all concentrations after 96 h. The main
gill effects recorded in treated animals were: mucous
secretion, the appearance of tubular vesicles cells (TVC)
and a degeneration phenomenon.
Comparing these results with our previous findings
in which we used growth, developmental rate and
behaviour as endpoints, we also demonstrated that the
first effect of endosulfan on Bufo bufo was gill
alteration, thus supporting the role of a morphological
approach in toxicological studies.
This study provides additional information on the
role of morphological studies in demonstrating the
effects of exposure to environmental pollutants. In this
context, the use of amphibian gills, as effective
biomarkers, is a valuable approach in evaluating
exposure to agrochemicals.
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