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Pugilina morio L., a new imposex exhibitor from South American estuarine environments: approach for a non-lethal
Deyse de Azevedo1, Cristina de Almeida Rocha-Barreira, Helena Matthews-Cascon
1Laboratório de Zoobentos do Instituto de Ciências do Mar, Universidade Federal do Ceará, Av. da Abolição, 3207, Bairro Meireles, 60165-081 Fortaleza, CE, Brasil.
Abstract:
This is the first report on imposex occurrence in Pugilina morio. Imposex levels in P. morio from Ceará River Estuary were assessed by a non-lethal method. The obtained imposex parameters were: percentage = 37.1 %, female penis length index (FPLI) = 0.93 mm, relative penis length index (RPLI) = 6.5 %, and vas deferens sequence index (VDSI) = 1.0. Because imposex is induced by tributyltin, and P. morio is widely distributed on the East coast of South America, the species can be used as a tributyltin contamination sentinel in these estuaries. Additionally, a non-lethal method of evaluating imposex minimized the impact on the population of P. morio from sample collection, as all organisms were returned to the environment.
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