Biomphalaria glabrata check for this species in other resources - Melanoides tuberculata check for this species in other resources - schistosomiasis control"/>
search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 98, No. 3, 2003, pp. 429-431
Bioline Code: oc03095
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 98, No. 3, 2003, pp. 429-431

 en SHORT COMMUNICATION - Apparent Competition Through Facilitation between Melanoides tuberculata check for this species in other resources and Biomphalaria glabrata check for this species in other resources and the Control of Schistosomiasis
Alexandre Giovanelli; Marcus Vinicius Vieira & Cesar Luiz Pinto Ayres Coelho da Silva

Abstract

Interactions between two species that result in reduced growth rates for both and extinction of one of the species are generally considered cases of asymmetric interspecific competition. Exploitative or interference competition is the usual mechanism invoked. Here we describe another mechanism producing the same result, named apparent competition through facilitation (ACF), observed between Melanoides tuberculata check for this species in other resources and Biomphalaria glabrata check for this species in other resources populations. The superior competitor actually gives some benefit to the other species, whose population becomes unstable with progressively increasing oscillations, leading to extinction. A model of ACF using difference equations suggests initial dynamics distinct from traditional interspecific competition. The dynamics of two freshwater snails in the field and in laboratory experiments suggest ACF, and these relations should be considered in studies of schistosomiasis control. ACF could occur in natural populations, but might have gone undetected because the final result is similar to traditional interspecific competition.

Keywords
apparent competition - population interactions - Biomphalaria glabrata check for this species in other resources - Melanoides tuberculata check for this species in other resources - schistosomiasis control

 
© Copyright 2003 - Instituto Oswaldo Cruz - Fiocruz
Alternative site location: http://memorias.ioc.fiocruz.br

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2017, Site last up-dated on 16-Oct-2017.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil