Publication: Effects of sediment sorbed linear alkylbenzene sulphonate on juveniles of the Senegal sole, Solea senegalensis, Toxicity and histological indicators
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Date
2008
Authors
Hampel, M. ; Ortiz-Delgado, J.B. ; Sarasquete, C. ; Blasco, J.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Many synthetic organic substances, including
surfactants, tend to be sorbed on suspended solids and to
accumulate finally on bottom sediments, where benthic
communities may be exposed to them. Concentrations of
Linear Alkylbenzene Sulphonates (LAS) have been
detected in estuarine and coastal sediments, presenting
wide concentration ranges depending on the presence of
treatment facilities, hydrodynamic conditions, organic
matter content, etc.
Senegal sole, Solea senegalensis, larvae (40 days
posthatching; dph) were exposed to increasing
concentrations of LAS spiked sediments, comprised
between 0.37 and 880.78 mg LAS·kg-1 during 30 days.
The obtained results showed that survival of exposed
larvae was not significantly affected at environmentally
relevant concentrations, the LC50 value being obtained
after 30 days 876.46 mg·kg-1. However, the histological
and histopathological analyses carried out in target
organs revealed, that first alterations from the normal
pattern were observed at concentrations of 222.66
mg·kg-1, presenting effects such as blood extravasation
and hyperplasy of the lamellar epithelium in gills,
increase of inter-myotomal spaces of the skeletal
musculature and edematous separation of the skin from
epidermis. At the highest exposure concentrations
(755.27 and 880.78 mg LAS·kg-1), shrinkage of
hepatocytes, nuclear pycnosis and blood stagnation are
observed in the liver, degeneration of pancreatic cells,
reduction of hemocytopoietic tissue in the kidney and
vacuolisation of intestinal enterocytes was observed at
histological level, as well as severe separation of the
epidermis from the underlying tissues. Simultaneously, a
significant increase of the wet weight with exposure
concentration was observed in the test organisms.
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