Acute toxicity of tributyltin to encapsulated embryos of a marine gastropod

AVERBUJ A.; PRIMOST M.A.; GIULIANELLI S.; BIGATTI G.

MOLLUSCAN RESEARCH

MAGNOLIA PRESS

Lugar: Auckland; Año: 2017

1323-5818

The marine gastropod Buccinanops globulosus is known to have high imposex incidence in areas moderately polluted by tributyltin (TBT). Acute toxicity was previously studied in adults but no information is known about embryonic intracapsular development. To24 estimate the potential effects of organotin pollution on the progeny of B. globulosus, acute25 toxicity tests were conducted on encapsulated and excapsulated pre-hatching embryos. The lethal median concentration estimated for 96h (LC50 96h) in B. globulosus excapsulated embryos was 196.70 µg TBTCl L-1, while in encapsulated embryos it was 2951.28 µg TBTCl L-1. The LC50 96h was 15-fold higher for encapsulated embryos compared to excapsulated embryos, denoting egg capsule protection against pollutants from the external environment. Our results show that TBT pollution can have significant effects in molluscs other than the chronic effect of imposex.