Competição biológica entre Biomphalaria glabrata (Say, 1818) e Biomphalaria tenagophila (d'Orbigny, 1835) em criadouros naturais no município de Ourinhos, SP (Brasil)

Kawazoe, Urara; Magalhães, Luiz Augusto; Hotta, Luiz Koodi; Takaku, Luiz

doi:10.1590/s0034-89101980000100006

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Desde então, sabia-se que a espécie predominante, B. glabrata, era altamente suscetível ao S. mansoni (Magalhães & Dias 1973). Estudos posteriores mostravam que a predominância de B. glabrata implicava na baixa freqüência de B. tenagophila, supostamente por exclusão competitiva (Kawazoe et al 1980). Em 1981, Paraense descreve a B. occidentalis, esclarecendo definitivamente as diferenças específicas entre a espécie e a B. tenagophila.…”

Section: Resultsunclassified

Distribuição e diversidade de espécies do gênero Biomphalaria em microrregiões localizadas no Médio Paranapanema, São Paulo, SP, Brasil

Tuan

2009

Biota Neotrop.

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TUAN, R. 2009. Diversity and distribution of the Biomphalaria species in the middle reaches of the Paranapanema River, São Paulo, SP, Brazil. Biota Neotrop. 9(1): http://www.biotaneotropica.org.br/v9n1/en/ abstract?short-communication+bn03009012009. Abstract:The predominant landscape in the studied region, composed by the Paranapanema and Pardo rivers, has been significantly affected by human interference in order to create extensive artificial irrigation ditches for agriculture. These environments are subject to drastic variations in water supply whereby draughts are created what bears a drastic populational fluctuation. The composition of schistosomiasis-associated planorbid fauna in Ourinhos and Ipauçu herein presented corroborate previous malacological surveys, which incriminates Biomphalaria. glabrata (Say, 1818) as the predominant species mainly at the Ourinhos micro-regions. At this site the snail distribution might be linked to the composition of deposited sediments in the hydrographic basin. Data from Ipauçu, a collection site that is only 30 km from Ourinhos, indicates absence of B. glabrata, and predominance of B. tenagophila (Orbigny, 1835

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Section: Resultsunclassified

Distribuição e diversidade de espécies do gênero Biomphalaria em microrregiões localizadas no Médio Paranapanema, São Paulo, SP, Brasil

Tuan

2009

Biota Neotrop.

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“…Interspecific competition among freshwater snails has been demonstrated (Dupouy, Abdelhak & Yazid 1980;Kawazoe et al 1980;Brown 1982;Pointier 1986). Madsen (1983) reported an almost non-overlapping distribution of Biomphalaria pfeifferi and Helisoma duryi, although it could not be deduced whether this was due to competition or to differences in the habitat preferences of the two species.…”

Section: Resultsmentioning

confidence: 99%

Distribution of Freshwater Snails in Irrigation Schemes in the Sudan

Madsen¹,

Daffalla²,

Karoum³

et al. 1988

The Journal of Applied Ecology

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“…It is known that changes to the distribution of the intermediate host snail influences the morbidity caused by the disease in the human population (Kawazoe et al, 1980). Thus, it is possible that replacement of B. glabrata by B. straminea at the study locality may have had an impact in terms of reduction of the risk of disease transmission, considering that B. straminea is a relatively poor intermediate host for S. mansoni and that human exposure at that locality is accidental and seasonal.…”

Section: Discussionmentioning

confidence: 99%

Study of the snail intermediate hosts for Schistosoma mansoni on Itamaracá Island in northeast Brazil: spatial displacement of Biomphalaria glabrata by Biomphalaria straminea

Barbosa

Nascimento

et al. 2014

Geospat Health

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Abstract. In 2012 a malacological survey of the breeding sites of Biomphalaria glabrata and B. straminea, the two intermediate host snails of Schistosoma mansoni, was carried out on Itamaraca Island in Pernambuco, Brazil. This study has now been extended by studying the competition between the two species. Snails were collected and dissected to identify the species and tests were performed to verify S. mansoni infection. Student's t test was used to compare the proportion between the two species and their breeding sites and a parasitological survey was conducted among local residents, using the Kato-Katz method. The spatial distribution of the two snail species was determined using TerraView, while a snail density map was constructed by Kernel estimate. The survey identified two breeding sites for B. glabrata with 17 specimens and 19 breeding sites for B. straminea with 459 snails, all of them negative for S. mansoni infection. The statistical analysis revealed that the proportion of the numbers of specimens and breeding sites of B. straminea (37.84 ± 9.01) were significantly greater than those of B. glabrata (8.50 ± 6.50). Parasitological examinations from 41 residents diagnosed two cases of schistosomiasis with parasite loads of 60 and 84 eggs per 1 g of stool, respectively. This indiction of a competitive process between the two snail species requires monitoring of schistosomiasis in the resident and travelling human populations occupying this environment, which could potentially result in social and economic changes on the island risking its attraction as a centre for eco-tourism.

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Competição biológica entre Biomphalaria glabrata (Say, 1818) e Biomphalaria tenagophila (d'Orbigny, 1835) em criadouros naturais no município de Ourinhos, SP (Brasil)

Cited by 9 publications

References 9 publications

Distribuição e diversidade de espécies do gênero Biomphalaria em microrregiões localizadas no Médio Paranapanema, São Paulo, SP, Brasil

Distribuição e diversidade de espécies do gênero Biomphalaria em microrregiões localizadas no Médio Paranapanema, São Paulo, SP, Brasil

Distribution of Freshwater Snails in Irrigation Schemes in the Sudan

Study of the snail intermediate hosts for Schistosoma mansoni on Itamaracá Island in northeast Brazil: spatial displacement of Biomphalaria glabrata by Biomphalaria straminea

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