[MARMAM] New papers from a vulnerable Brazilian dolphin

Mariana Alonso alonso.mb at gmail.com
Wed Aug 29 18:44:46 PDT 2012

To: marmam at lists.uvic.ca

Subject: [MARMAM] New papers from a vulnerable Brazilian dolphin

On behalf of my co-authors, I am pleased to announce the publication of the
two following articles:

Mariana B. Alonso, Maria Luisa Feo, Cayo Corcellas, Lara G. Vidal, Carolina
P. Bertozzi, Juliana Marigo, Eduardo R. Secchi, Manuela Bassoi, Alexandre
F. Azevedo, Paulo R. Dorneles, João Paulo M. Torres, José Lailson-Brito,
Olaf Malm, Ethel Eljarrat, Damià Barceló


“*Pyrethroids: A new threat to marine mammals?”*

*Environment International* 47: 99–106


The present study constitutes the first investigation to demonstrate
pyrethroid bioaccumulation in marine mammals, despite the assumption that
these insecticides are converted to non-toxic metabolites by hydroly- sis
in mammals. Twelve pyrethroids were determined in liver samples from 23
male franciscana dolphins from Brazil. The median concentration values for
total pyrethroids were 7.04 and 68.4ng/g lw in adults and calves,
respectively. Permethrin was the predominant compound, contributing for 55%
of the total pyre- throids. Results showed a distinct metabolic balance of
pyrethroids through dolphin life. High loads are re- ceived at the
beginning of their lives and, when they reach sexual maturity, these
mammals seem to degrade/metabolize pyrethroids. Maternal transfer of these
compounds was also evaluated through the anal- ysis of breast milk and
placenta samples. Pyrethroids were detected in both matrices, with values
between 2.53–4.77ng/g lw and 331–1812ng/g lw, respectively. Therefore, for
the first time, a study shows mother-to-calf transfer of pyrethroids by
both gestational and lactation pathways in dolphins.

Mariana B. Alonso, Ethel Eljarrat, Marina Gorga, Eduardo R. Secchi, Manuela
Bassoi, Lupércio Barbosa, Carolina P. Bertozzi, Juliana Marigo, Marta
Cremer, Camila Domit, Alexandre F. Azevedo, Paulo R. Dorneles, João Paulo
M. Torres, José Lailson-Brito, Olaf Malm, Damià Barceló (2012)

“*Natural and anthropogenically-produced brominated compounds in endemic
dolphins from Western South Atlantic: Another risk to a vulnerable species”*

*Environmental Pollution* 170: 152-160


Liver samples from 53 Franciscana dolphins along the Brazilian coast were
analyzed for organo- brominated compounds. Target substances included the
following anthropogenic pollutants: poly- brominated diphenyl ethers
(PBDEs), polybrominated biphenyls (PBBs), pentabromoethylbenzene (PBEB),
hexabromobenzene (HBB), decabromodiphenylethane (DBDPE), as well as the
naturally- generated methoxylated-PBDEs (MeO-PBDEs). PBDE concentrations
ranged from 6 to 1797 ng/g lw (mean 166 ` 298 ng/g lw) and were similar to
those observed in cetaceans from Northern Hemisphere. PBBs were found in
all sampling locations (<LOQ to 57 ng/g lw). DBDPE was detected in 42% of
the dolphins from the most industrialized Brazilian state and the
concentrations ranging from <LOQ to 352 ng/g lw. Franciscana dolphins from
the tropical Brazilian shore presented the highest MeO-PBDE concentrations
ever reported for coastal cetaceans (up to 14 mg/g lw). Eight MeO-PBDE
congeners were detected and the present investigation constituted the first
record of occurrence of six of them in marine mammal livers.

The full text and pdf are available from:



For any questions or pdf requests please email:

Mariana Alonso: alonso.mb at gmail.com <skj3 at st-andrews.ac.uk>

Best regards,

Mariana Alonso
*Mariana Batha Alonso*
*PhD Student*
* *
*Biophysics **Institute**, **Federal **University of Rio de Janeiro, Brazil*
*Aquatic Mammal and Bioindicator Lab, University of the State of Rio de
Janeiro, Brazil
Projeto BioPesca, São Paulo, Brazil*
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