DDT in Biota of Paranaguá Bay, Southern Brazil: Recent Input and Rapid Degradation
2011
Liebezeit, Gerd | Brepohl, Daniela | Rizzi, Juliane | Guebert, Flavia | Krome, Mats | Machado, Eunice | Pijanowska, Ursula
The presence of recent dichlorodiphenyltrichloroethane (DDT) inputs is established for Paranaguá Bay biota, i.e. bivalves, fish and one sponge. Values ranged from 6.9 to 156.2 ng ΣDDT/g dry weight. Three fish species analysed showed ΣDDT values from 36.8 to 92.1 ng/g dry weight. The highest contents (up to 156.2 ng ΣDDT/g dry weight) were found for mangrove oysters (Crassostrea rhizophorae) at locations affected by sewage discharge from Paranaguá City. Turtles as herbivores were not affected by this input with values of 0.7 and 2.2 ng ΣDDT/g dry weight. The areal distribution of samples suggests that usage of DDT is widespread around the bay. Fresh DDT input is degraded to DDE and DDD within approximately 5 months.
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