high accumulation of pcdd, pcdf, and pcb congeners in marine mammals from brazil: a serious pcb problem. | blubber samples from three delphinid species (false killer whale, guiana and rough-toothed dolphin), as well as liver samples from franciscana dolphins were analyzed for dioxins and related compounds (drcs). samples were collected from 35 cetaceans stranded or incidentally captured in a highly industrialized and urbanized area (southeast and southern brazilian regions). dioxin-like pcbs accounted for over 83% of the total teq for all cetaceans. non-ortho coplanar pcbs, for franciscanas (82%), an ... | 2013 | 23827355 |
small cetaceans found stranded or accidentally captured in southeastern brazil: bioindicators of essential and non-essential trace elements in the environment. | essential (cu, mn, se and zn) and non-essential (cd and hg) elements were analyzed in the hepatic tissue of 22 individuals of seven different species of small cetaceans (feresa attenuata; orcinus orca; pontoporia blainvillei; sotalia guianensis; stenella frontalis; steno bredanensis; tursiops truncatus) accidentally caught in fishing nets or found stranded along the northern coast of the state of rio de janeiro, brazil, between 2001 and 2010. atlantic spotted dolphin (s. frontalis) showed the hi ... | 2013 | 23993648 |
organochlorine compound accumulation in delphinids from rio de janeiro state, southeastern brazilian coast. | the present study investigated organochlorine compound levels (pcbs, ddts and hcb) in blubber samples of six delphinid species from rio de janeiro state, southeastern brazilian coast. the species analyzed inhabit the continental shelf (one killer whale, one false killer whale, two bottlenose dolphins, three rough-toothed dolphins, and four long-beaked common dolphins) and open ocean (four fraser's dolphins). pcbs represented the greatest proportion of the sum of all measured organochlorines (fro ... | 2012 | 22771469 |
an assessment of pcb and pbde contamination in two tropical dolphin species from the southeastern brazilian coast. | pcbs and pbdes were determined in two dolphin species, sotalia guianensis and steno bredanensis, from an upwelling system off the central-northern coast of rio de janeiro, brazil. pcb levels varied from 0.040 to 0.75 μg g(-1) lw in muscles and from 0.022 to 1.32 μg g(-1)lw in liver samples from s. guianensis. in s. bredanensis, values varied from 0.085 to 11.3 μg g(-1) lw in muscles and from 0.024 to 18.6 μg g(-1) lw in livers. pcb-138, -153 and -180 were the major pcb congeners detected in both ... | 2015 | 26506024 |
mercury, selenium and stable isotopes in four small cetaceans from the southeastern brazilian coast: influence of feeding strategy. | dolphins are good bioindicators of the contamination status of marine ecosystems, since their dietary and habitat plasticity in both coastal and offshore ecotypes provide information on the trace elements levels originated from natural and anthropogenic sources. in this context, this study aimed to investigate provides mercury (hg), selenium (se) levels, trophic ecology and feeding environments of four small cetaceans (tursiops truncatus, steno bredanensis, sotalia guianensis and pontoporia blai ... | 2016 | 27593348 |
whistle comparison of four delphinid species in southeastern brazil. | the present study evaluates variations in frequency and duration parameters of whistles of four dolphin species (sotalia guianensis, steno bredanensis, stenella frontalis, and tursiops truncatus), recorded in the rio de janeiro state coast, southeastern brazil. a total of 487 whistles were analyzed. acoustic parameters of the whistles were classified to species by discriminant function analysis. overall classification score was 72.5%, with the highest classification score obtained for whistles o ... | 2016 | 27250196 |