Resumo

SALAS-SALAZAR, María Luisa et al. Temperature effect on bioaccumulation of hydrocarbons in american oysters Crassostrea virginica. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.11, pp.299-308. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n11.1006.

Several studies show the effect of temperature on the bioaccumulation of contaminants in bivalve mollusks, but the influence of this factor on the bioaccumulation of hydrocarbons (HC) in Crassostrea virginica has not been reported. In this work the effect of temperature on HC accumulation in C. virginica under controlled conditions, survival rate (SR) and gametogenic development was studied. Four treatments with different temperatures and an HC concentration were studied: A (without HC at 26 °C), B (with HC at 30 °C), C (with HC at 26 °C) and D (with HC a 30 °C) and the control (without HC at ambient temperature). Results showed that the control and treatments A and B had the lowest HC bioaccumulation values with amounts below 30 mg kg-1. In treatment C, accumulation values of 83 mg kg-1 were obtained, while treatment D recorded the highest HC level, 118 mg kg-1, and the lowest SR (53 %). The highest SR (93 %) was recorded in the control and treatments A and C. At the cellular level no pathology was identified, but gonadal development was affected by the presence of HC and the temperature of 30 °C, with little gonadal growth and indefinite organisms predominating. The different temperatures did not influence HC bioaccumulation in the organisms, but a negative effect on gametogenic development and SR was observed.

Palavras-chave : Gametogenesis; mollusk; petroleum; sediment; survival rate.

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