INVESTIGADORES
ARIAS Andres Hugo
congresos y reuniones científicas
Título:
Biomagnification vs. diffusive uptake of PAHs in marine zooplankton: an experimental study
Autor/es:
ARIAS, ANDRÉS HUGO; SOUISSI, ANISSA; MARION ROUSSIN; NET SOPHEK; DUMOULIN DAVID; OUDANNE, BAGHDAD; QUINTAS, PAMELA.; J. MARCOVECCHIO; SOUISSI, SAMI
Lugar:
Mar del Plata
Reunión:
Congreso; III Reunion Argentina de Geoquímica de la Superficie; 2014
Institución organizadora:
Instituto de Geología de Costas y del Cuaternario (IGCYC) Facultad de Ciencias Exactas y Naturales-Universidad Nacional de Mar del Plata
Resumen:
Polycyclic aromatic hydrocarbons (PAHs) are a
widely distributed group of organic pollutants originating from petrogenic,
pyrogenic and natural sources, which
have the potential to enter to the marine trophic web, bioaccumulate and
biomagnificate. Whether biomagnification between the trophic levels
?phytoplankton? and ?zooplankton?
actually occurs in the field is still an open question, but a question that
needs to be answered in order to make reliable predictions about persistent
organic compounds fate in aquatic ecosystems. Then, the aim of the present
study were to perform carefully controlled experiments to investigate the
importance of the exposure route (water or contaminated food) for the
bioaccumulation of some PAHs in the marine copepod Pseudiaptomus marinus. Two main hypotheses were tested: 1.
Biomagnification is higher in feeding animals due to the uptake of PAHs via
contaminated food in addition to diffusive uptake via body surfaces. 2.
Biomagnification increases with hydrophobicity of the exposed compound.
Experimental procedure were set in duplicate and each copepod condition was fed
during the treatment in order to parallel realistic marine conditions. During
the exposure, continuous sub-sampling of water medium and animals was performed.
Each sample was extracted and GC/MS analyzed for selected PAHs. Results showed
that the marine copepod is capable of accumulate PAHs by the two ways of
exposure, either present in the medium (diffusive uptake) or in the food
(algae) and that both mechanisms were increased with the Log Kow of
the corresponding PAH. Therefore, PAH?s bioaccumulation cannot be solely
modelled as a passive partitioning between the organisms and the surrounding
water.