INVESTIGADORES
GARCIA german oscar
congresos y reuniones científicas
Título:
Persistent Organic Pollutants and chlorpyrifos in feathers of the threatened Olrog's gull (Larus atlanticus) wintering in southeastern Buenos Aires province, Argentina
Autor/es:
QUADRI ADROGUÉ AGUSTINA; SECO PON JUAN PABLO; GARCÍA GERMÁN OSCAR; CASTANO MELINA; COPELLO SOFÍA; BEATRIZ MIGLIORANZA, KARINA SILVIA
Reunión:
Conferencia; YES 2019; 2019
Resumen:
Persistent Organic Pollutants (POPs) such as Organochlorinepesticides (OCPs), polychlorinated biphenyls (PCBs) andpolybrominated diphenyl ethers (PBDEs) are anthropogenicchemicals characterized by their hydrophobicity, volatility andenvironmental persistence. These characteristics lead to them to behighly toxic, have considerable bioaccumulation andbiomagnification in the food web. POPs were banned years agoand have been regulated since 2001 under the StockholmConvention. Chlorpyrifos is an organophosphate insecticidecurrently in use, whose use has been increased following thebanning of endosulfan in 2013. Marine birds, such as gulls, havebeen used as an indicator of chemical pollution of aquaticecosystems given their trophic position; besides these species arecapable to bioaccumulate pollutants in their tissues. In this context,the objective of this study was to determine levels of POPs andchlorpyrifos in feathers of the Olrog´s gull (Larus atlanticus) andexamine its relationship with sex and age class, during the nonbreeding season in Mar Chiquita lagoon, Buenos Aires province,Argentina. POPs and chlorpyrifos were identified and quantifiedby gas chromatography with electron capture detector (GC-ECD).Chlorpyrifos was found in greater quantities among all thepollutants in all groups of individuals (c= 262,93 ng/g), resultingfrom current agricultural practices. The highest values of POPs(males c = 280.45 ng/g, females c = 300.6 ng/g) were found injuvenile birds. OCPs were found in all sampled birds. Endosulfanwas the main OCP group, which contributed to the total OCPsconcentration in 33%, followed by HCHs with 28%. Among thePCBs, there was a predominance of dichlorbiphenyls andtrichlorbiphenyls (#33, #44 and #31+28); these congeners havegreater volatility and solubility than more chlorinated PCBs, whichjustifies the possible external deposition of these contaminants.The presence of hexachlorbiphenyls (#153 and #138) and PBDE153 in juvenile birds would be a consequence of the location of thenesting area, possibly next to the Bahia Blanca estuary, known forbeing a POPs hot spot. Concentrations of POPs and chlorpyrifosshowed difference between sexes in subadults and adults birds,while levels found in males were higher than in females. Overall,the present study provides relevant information for thedevelopment of monitoring programs and regional strategies toimprove the conservation status of the threatened Olrog´s gull.