Título: | INFLUENCE OF ECOLOGICAL AND BIOLOGICAL PARAMETERS ON THE ACCUMULATION OF ESSENTIAL (SE, AS, CU) AND NON-ESSENTIAL ELEMENTS (HG, CD, AG, PB) BY THE LIVER AND KIDNEY OF CETACEANS FROM THE WESTERN SOUTH ATLANTIC OCEAN | ||||||||||||||||||||||||||||||||||||||||
Autor: |
TERCIA GUEDES SEIXAS |
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Colaborador(es): |
ISABEL MARIA NETO DA SILVA MOREIRA - Orientador HELENA DO AMARAL KEHRIG - Coorientador |
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Catalogação: | 23/JAN/2009 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=12974&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=12974&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.12974 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
The present work tested whether ecological and biological
parameters have an influence on the accumulation of trace
elements and organic mercury (HgOrg) by the liver and
kidney of coastal (Pontoporia blainvillei, N = 31; Sotalia
guianensis, N = 21) and oceanic (Stenella coeruleoalba, N =
3; Stenella frontalis, N = 4) cetaceans species
incidentally caught in fishing nets along two Brazilian
coastal areas (tropical - northern Rio de Janeiro State and
subtropical -Rio Grande do Sul State). This research added
new insight to the existing studies with trace element
concentrations in internal organs of marine cetaceans from
the southwestern Atlantic Ocean. Few studies have
documented trace element concentrations in marine mammals
in this area. Analytical methodologies based
on atomic absorption spectrometry (AAS), using the graphite
furnace (GF-AAS) and cold vapor (CV-AAS) techniques were
applied for this purpose. They are the most popular
analytical techniques applied for trace element and mercury
determination, respectively, in biological samples.
Precision and accuracy of the analytical methods were
determined and monitored using certified material from
National Research Council - Canada (DORM-2, DOLT-2 and TORT-
2). Interspecies (coastal and oceanic cetacean species) and
regional (tropical and subtropical regions) differences
were observed in the accumulation of trace
elements and organic mercury in organs, liver and kidney.
The highest concentrations of these elements were observed
in the liver of the oceanic cetacean species. However, no
gender differences were found on the
bioaccumulation of trace elements and also organic mercury.
Biological parameters such as, population, body length and
sexual maturity influenced on the trace element and organic
mercury accumulation by both organs, according to the
cetacean species and caught area. S. guianensis, which co-
habits the same coastal marine environment that P.
blainvillei species, was the only dolphin species that
presented a Se:Hg molar ratio close to 1:1, showing that a
probable detoxification process can be occurring in the
liver of S. guianensis. This dolphin species feeds
mainly on predatory fish, while P. blainvillei feeds mainly
on fish and cephalopods. P. blainvillei presented a Se:Hg
molar ratio close to 4:1. It`s known that transition
metals, such as Hg, Cd and Ag, have an interaction with Se
in the liver of marine mammals. The molar concentrations of
Cd (p = 0.01) and Ag (p < 0.001) presented significant
correlations with the hepatic molar Se in the liver of
S. guianensis. P. blainvillei from both sampling areas
presented a high significant correlation for molar Se to Hg
concentrations (p < 0.001) in liver. Meanwhile,
only individuals of P. blainvillei from tropical region
showed a significant correlation with hepatic Se and Cd (p
< 0.001). Based on the results present here,
it is possible to conclude that, not only the different
environmental conditions, but also life span, growth stage
but mainly the feeding habit influenced the
accumulation of trace elements and organic mercury by
cetacean tissues. These ecological and biological
parameters influenced on the inter-element relationships.
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