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DOES THE TREMATODE CENTROCESTUS FORMOSANUS AFFECT THE LOCOMOTORY ACTIVITY OF THE MOLLUSC MELANOIDES TUBERCULATUS?
Afiliación
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Avaliação e Promoção da Saúde Ambiental. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Avaliação e Promoção da Saúde Ambiental. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Avaliação e Promoção da Saúde Ambiental. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Avaliação e Promoção da Saúde Ambiental. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Avaliação e Promoção da Saúde Ambiental. Rio de Janeiro, RJ, Brasil.
Resumen en ingles
Background: Melanoides tuberculatus (Müller, 1774) (Thiaridae), an introduced gastropod mollusc with a wide
geographical distribution in the Neotropics, is the intermediate host of the trematode Centrocestus formosanus
(Nishigori, 1924) (Heterophyidae). This parasite is considered to be pathogenic to humans. The aim of the present
work was to evaluate the locomotory activity of uninfected M. tuberculatus compared with those naturally infected
with C. formosanus.
Findings: The locomotory activity of each mollusc was recorded using an image analysis biomonitoring system,
Videomex-V W, to evaluate and quantify the parameters of ‘Stereotypic’ and ‘Resting time’. The Generalized
Estimating Equation analysis of locomotory activity of M. tuberculatus infected with C. formosanus revealed
significant differences compared with uninfected molluscs for the parameters ‘Stereotypic time’ and ‘Resting time’
with a reduction of movement. The variations in the values of the monitoring intervals recorded showed a
significant difference for the infected molluscs in the case of Stereotypic time, with an irregular locomotory activity
pattern, as compared to that of uninfected molluscs. The analysis of the standard length of all molluscs did not
exhibit any correlation with locomotory activity, showing that C. formosanus is able to alter the locomotory activity
of its snail host regardless of the standard length.
Conclusions: The trematode C. formosanus affects the locomotory activity of the mollusc M. tuberculatus by
reducing its movement and causing it to exhibit an irregular pattern of activity, both of which are independent of
the snail's standard length.
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