Miranda, Marcel SabinoFontenelle, Jose HeitzmannPecora, Iracy Lea [UNESP]2015-03-182015-03-182015-01-10Journal Of Natural History. Abingdon: Taylor & Francis Ltd, v. 49, n. 1-2, p. 19-35, 2015.0022-2933http://hdl.handle.net/11449/116934Native Megalobulimus paranaguensis was identified on Brazil's Ilha Porchat promontory, an area that Achatina fulica commonly populates. The population structures of these species were investigated for interactions. Spatial distribution, niche overlap and mark-recapture analysis were conducted. The outer lip of M. paranaguensis and environmental variables were measured. One and two abundance peaks were observed for A. fulica and M. paranaguensis, respectively. Survivorship was higher in A. fulica. Distribution was aggregate for M. paranaguensis, whereas for A. fulica it varied from random to aggregate. Both species aggregate as abundance increases. The lifespan of M. paranaguensis in this location is shorter than its lifespan in a nearby location. Achatina fulica was affected by soil temperature and humidity; M. paranaguensis was influenced by humidity. Niche overlap was random. The results show that M. paranaguensis can keep its natural activity and abundance in the presence of A. fulica, but environmental degradation impacts M. paranaguensis and should be evaluated.19-35engpopulation structureMegalobulimus paranaguensisAchatina fulicaalien speciesArtigo10.1080/00222933.2014.930756WOS:000345205900002Acesso restrito2276502021143056