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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 90, No. 2, 1995, pp. 261-269
Bioline Code: oc95052
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 90, No. 2, 1995, pp. 261-269

 en Current Advances on the Study of Snail-Snail Interactions, with Special Emphasis on Competition Process
Jose Rabelo De Freitas & Mairy Barbosa Loureiro Dos Santos


Field work research on population dynamic of snails from the
regions of Belo Horizonte and Lagoa Santa give much information about
interactions among two or more species of mollusks:  Pomacea  haustrum
  check for this species in other resources
 Biomphalaria  glabrata
  check for this species in other resources
, B. tenagophila, B. straminea and  Melanoides 
  check for this species in other resources
. Data ranging from two years to several decades ago 
suggest that the Pampulha reservoir is like a cemetery of B. glabrata 
and B. straminea, species that coexist for more than 14 years in a
small part of a stream, whereas only B.glabrata  lives in
all the streams of the basin. In the last ten to twenty years B. 
tenagophila has coexisted with P. haustrum and  M. tuberculata in 
the Serra Verde ponds and in the Pampulha dam. However these species 
have not settled in any of the brooks, except temporarily. The data 
suggest that the kind of biotope and the habitat conditions
are decisive factors for the permanence of each species in
its preferencial biotope.

B. glabrata, natural from streams and riverheads, quickly disappears from the reservoirs and ponds where it coexists with other species for a short time, independently of the competitive process. Competition needs to be better studied, since in Central America and Caribean islands this kind of study has favored the biological control of planorbid species.

biological control - snail competition - Biomphalaria tenagophila - Melanoides tuberculata

© Copyright 1995 Fundacao Oswaldo Cruz (Fiocruz)
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