Principaux facteurs régissant la densité des populations de <i>Biomphalaria glabrata</i> (Say 1818), Mollusque vecteur de la Schistosomose en Guadeloupe (Antilles françaises)

Pointier, J. P.; Salvat, Bernard; Delplanque, A.; Golvan, Yves J.

doi:10.1051/parasite/1977523277

Cited by 11 publications

(5 citation statements)

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“…Pointier ; Leveque & Pointier ; Pointier & Combes ; Pointier et al . ; Pointier & David ; Lamy et al . , ), and a yearly extensive survey has been initiated in 2001.…”

Section: Methodsmentioning

confidence: 99%

“…Their distribution and ecology have been well studied in Guadeloupe for about 40 years (e.g. Pointier 1974;Leveque & Pointier 1976;Pointier & Combes 1976;Pointier et al 1977;Pointier & David 2004;Lamy et al 2012aLamy et al , 2013, and a yearly extensive survey has been initiated in 2001. Twenty-nine mollusc species (Table S1, Supporting information; Pointier 2008) have been recorded in Guadeloupe, essentially belonging to two major clades, the Pulmonates and the Caenogastropods.…”

Section: Methodsmentioning

confidence: 99%

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Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

et al. 2013

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An increasing number of studies are simultaneously investigating species diversity (SD) and genetic diversity (GD) in the same systems, looking for 'species- genetic diversity correlations' (SGDCs). From negative to positive SGDCs have been reported, but studies have generally not quantified the processes underlying these correlations. They were also mostly conducted at large biogeographical scales or in recently degraded habitats. Such correlations have not been looked for in natural networks of connected habitat fragments (metacommunities), and the underlying processes remain elusive in most systems. We investigated these issues by studying freshwater snails in a pond network in Guadeloupe (Lesser Antilles). We recorded SD and habitat characteristics in 232 ponds and assessed GD in 75 populations of two species. Strongly significant and positive SGDCs were detected in both species. Based on a decomposition of SGDC as a function of variance-covariance of habitat characteristics, we showed that connectivity (opportunity of water flow between a site and the nearest watershed during the rainy season) has the strongest contribution on SGDCs. More connective sites received both more alleles and more species through immigration resulting in both higher GD and higher SD. Other habitat characteristics did not contribute, or contributed negatively, to SGDCs. This is true of the desiccation frequency of ponds during the dry season, presumably because species markedly differ in their ability to tolerate desiccation. Our study shows that variation in environmental characteristics of habitat patches can promote SGDCs at metacommunity scale when the studied species respond homogeneously to these environmental characteristics.

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“…Pointier ; Leveque & Pointier ; Pointier & Combes ; Pointier et al . ; Pointier & David ; Lamy et al . , ), and a yearly extensive survey has been initiated in 2001.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

et al. 2013

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“…In tropical countries, the alternation between dry and rainy seasons often brings about a prominent synchronous reproduction cycle in snails. Pointier et al (1977) showed that this cycle is dependent on the type of habitat in Guadeloupe: ponds are the most sensitive habitats to seasonal change, so that young snails are only numerous at the beginning of the rainy season. Nassi et al (1979) suggested that this period would be the most suitable for introduction of the trematode eggs, but that the middle of the dry season, when the few snails present are adult, would also be appropriate.…”

Section: (E) Possible Obstacles To Interventionmentioning

confidence: 99%

Trematodes: antagonism between species and sterilizing effects on snails in biological control

Combes

1982

Parasitology

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SUMMARYThere are two ways in which trematodes can be used in the control of other trematodes which transmit diseases of medical or veterinary importance. Either they can interfere with the reproductive capacity of the host species of snails, or they can exert an antagonistic effect against the larval stages of the target trematode species inside the snail. Often the two effects act together.There are six essential criteria for the selection of a suitable species of snail for control: (1) complete and permanent sterilizing effect; (2) clear dominance over target trematodes; (3) strong infectivity to molluscs of all ages; (4) high egg productivity in the definitive host; (5) lack of pathogenicity towards man and domestic animals; (6) ease and low cost of maintenance of the life-cycle.Various field trials are discussed and it is considered that trematode species producing rediae are usually dominant over those producing only sporocysts (such as the schistosomes). Most species used in control trials to date have belonged to the family Echinostomatidae as they have rediae, and eggs that can be produced in large numbers in a laboratory host such as the rat.The mathematical basis and feasibility of control schemes are discussed and it is concluded that much more information is necessary before their potential can be evaluated.

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“…Esse fenômeno certamente está associado a presença, ausência e variação da vegetação, a qual desempenha importante papel para o desenvolvimento de colônias de B. glabrata, seja servindo como substrato para a colocação de desovas 21 e para alimentação 18 ou protegendo contra fenômenos adversos como radiação solar, altas temperaturas e correntezas, 16 fatores de vital importância para o crescimento e a reprodução de moluscos do gênero Biomphalaria. Assim, nos pontos de coleta em que a vegetação era densa na maior parte do tempo, a abundância de B. glabrata era bem mais elevada que nos pontos de coleta com pouca vegetação.…”

Section: Discussionunclassified

Abundância e infecção do molusco Biomphalaria glabrata pelo Schistosoma mansoni no Estado do Rio de Janeiro, Brasil

et al. 2001

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OBJETIVOS: Investigar a distribuição espacial, a abundância e os índices de infecção natural de Biomphalaria glabrata, hospedeiro intermediário do Schistosoma mansoni, em localidade do Estado do Rio de Janeiro, RJ, Brasil. MÉTODOS: Na localidade de Pamparrão, município de Sumidouro, RJ, as coletas de moluscos foram realizadas bimestralmente no período de junho de 1991 a novembro de 1995. Foram estabelecidos 23 pontos de coleta ao longo do córrego Pamparrão e três de seus afluentes. Os moluscos capturados foram levados ao laboratório para diagnóstico da infecção. Para a análise dos dados, foram usados o coeficiente de Spearman (nível de 0,5% de significância) e o teste de qui-quadrado. RESULTADOS: A abundância populacional de B. glabrata foi bastante variável ao longo do tempo e entre os ambientes amostrados. A maioria dos pontos de coleta apresentou correlação negativa com a pluviosidade. O afluente B destacou-se dos demais corpos d'água por apresentar taxas de infecção de B. glabrata elevadas (acima dos 25% em alguns pontos de coleta) e persistentes. Foram encontrados mais moluscos infectados na estação seca do que na chuvosa (chi²=20,08; p=0,001). CONCLUSÕES: A população de moluscos foi influenciada negativamente pelo regime de chuvas, principalmente no córrego Pamparrão. A época de estiagem também parece ter favorecido a ocorrência de infecção, provavelmente devido ao menor volume de água dos córregos, o que aumentaria as chances de encontro do parasita com seu hospedeiro intermediário.

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Principaux facteurs régissant la densité des populations de Biomphalaria glabrata (Say 1818), Mollusque vecteur de la Schistosomose en Guadeloupe (Antilles françaises)

Abstract: Principaux facteurs régissant la densité des populations de Biomphalaria glabrata (Say 1818), M ollusque vecteur de la Schistosom ose en G uadeloupe (A ntilles fran çaises) (1) p ar J.-P. POINTIER , B. SA LV A T , A. DELPLANQ UE et Y. G O LV A N *

Cited by 11 publications

References 2 publications

Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

Trematodes: antagonism between species and sterilizing effects on snails in biological control

Abundância e infecção do molusco Biomphalaria glabrata pelo Schistosoma mansoni no Estado do Rio de Janeiro, Brasil

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Principaux facteurs régissant la densité des populations de Biomphalaria glabrata (Say 1818), Mollusque vecteur de la Schistosomose en Guadeloupe (Antilles françaises)

Abstract: Principaux facteurs régissant la densité des populations de Biomphalaria glabrata (Say 1818), M ollusque vecteur de la Schistosom ose en G uadeloupe (A ntilles fran çaises) (1) p ar J.-P. POINTIER *, B. SA LV A T *, A. DELPLANQ UE ** et Y. G O LV A N ***

Cited by 11 publications

References 2 publications

Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

Trematodes: antagonism between species and sterilizing effects on snails in biological control

Abundância e infecção do molusco Biomphalaria glabrata pelo Schistosoma mansoni no Estado do Rio de Janeiro, Brasil

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Abstract: Principaux facteurs régissant la densité des populations de Biomphalaria glabrata (Say 1818), M ollusque vecteur de la Schistosom ose en G uadeloupe (A ntilles fran çaises) (1) p ar J.-P. POINTIER , B. SA LV A T , A. DELPLANQ UE et Y. G O LV A N *