Acute toxicity of tributyltin to encapsulated embryos of a marine gastropod

AVERBUJ, ANDRÉS; PRIMOST, MÓNICA A.; GIULIANELLI, SEBASTIÁN; BIGATTI, GREGORIO

MOLLUSCAN RESEARCH

MAGNOLIA PRESS

Año: 2018 vol. 38 p. 29 - 33

1323-5818

The marine gastropod Buccinanops globulosus is known to have high imposex incidence in areasmoderately polluted by tributyltin (TBT). Acute toxicity was previously studied in adults but noinformation is known about embryonic intracapsular development. To estimate the potentialeffects of organotin pollution on the progeny of B. globulosus, acute toxicity tests wereconducted on encapsulated and excapsulated pre-hatching embryos. The lethal medianconcentration estimated for 96 h (LC50 96 h) in B. globulosus excapsulated embryos was196.70 μg TBTCl L−1, while in encapsulated embryos it was 2951.28 μg TBTCl L−1. The LC5096 h was 15-fold higher for encapsulated embryos compared to excapsulated embryos,denoting egg capsule protection against pollutants from the external environment. Ourresults show that TBT pollution can have significant effects in molluscs other than thechronic effect of imposex.