Lysosomal stability in oysters Crassostrea sp. from three different populations from the coast of São Paulo, Brazil
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2017
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SETAC LATIN AMERICA BIENNIAL MEETING, 12th
Resumo
Coastal zones continuously receive inputs of contaminants, which greatly affect its
quality. Biological effects resulting from environmental pollution are complex and
have not been properly estimated by chemical analysis and toxicity tests. A reliable
form to assess the environmental quality consists of analyzing organisms exposed to
constant, complex and diffuse sources of contamination. The appropriate use of
biomarkers in sentinel organisms may provide an estimate of the potential risk
associated with contamination. This study aims to evaluate if different levels of
potential contamination affect differently the stress responses in oysters from three
sites along the coast of São Paulo state. The physiological condition of oysters
Crassostrea sp. from Cananéia (reference site), Santos and Bertioga was studied by
analyzing the lysosomal membrane stability in haemocytes, measured using the
neutral red retention time (NRRT) assay. Adult organisms were collected in spring
(August, September, and October/2016) and autumn (April and May/2017). During
the spring, the times of retention of the neutral red dye were similar in oysters from
different sites and the reference area (p > 0.05). Interestingly, an uncommon red tide
occurred along the coast of the state mainly affecting Cananéia, which may have
influenced the reduction of the NRRT for oysters from this region. Such biological
events (algal blooms) are more likely to occur at this time of year due to the typical
climatic conditions, and may have the potential to even the adverse effects of pollution
on distinct bivalve populations subject to different levels of contamination. During the
autumn campaign, organisms from both contaminated sites (Santos and Bertioga)
showed significant reduction in the mean NRRT relative to the reference site (p <
0.05). A previous study in the same region (Catharino et al., 2015) observed that in
both seasons the oysters from Cananéia had a higher NRRT than the oysters from the
other two sites. Overall, the NRRT were lower in the present study. These results may
be due to the exposure of the organisms to pollutants, since lysosomes are organelles
that absorb a wide variety of organic and inorganic substances. However, further
investigations are required and being carried out to confirm this hypothesis.
Como referenciar
CAMARGO, J.; SOUSA, E.P.; CATHARINO, M.G.; GASPARRO, M.R.; ABESSA, D.M.; FERNANDES, I.; LINS, C.G.; VASCONCELLOS, M.B. Lysosomal stability in oysters Crassostrea sp. from three different populations from the coast of São Paulo, Brazil. In: SETAC LATIN AMERICA BIENNIAL MEETING, 12th, September 7-10, 2017, Santos, SP. Abstract... p. 39-39. Disponível em: http://repositorio.ipen.br/handle/123456789/31256. Acesso em: 29 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.