Experimental taxonomy of biomphalaria (gastropoda: planorbidae)

Henriksen, Ulf Blangsted; Jelnes, Jens Erik

doi:10.1016/s0021-9673(00)88427-7

Cited by 14 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Woodru¡ & Mulvey (1997) concluded from allozyme data that B. glabrata is either the most genetically variable mollusc species yet described or a syngameon of more than three semispecies. Conversely, biochemical and molecular di¡erentiation of three African Biomphalaria was more readily demonstrated, owing to their more limited genetic variability (Henriksen & Jelnes 1980;Kristensen et al 1998).…”

Section: Discussionmentioning

confidence: 99%

Molecular evidence supports an African affinity of the Neotropical freshwater gastropod,Biomphalaria glabrata, Say 1818, an intermediate host forSchistosoma mansoni

Campbell

Jones

Lockyer

et al. 2000

Proc. R. Soc. Lond. B

View full text Add to dashboard Cite

Freshwater snails of the genus Biomphalaria, Preston 1910, are the most important and widely distributed intermediate hosts of Schistosoma mansoni, the blood fluke responsible for human intestinal schistosomiasis, in Africa and the Neotropics. S. mansoni is thought to have been imported repeatedly into the Americas during the last 500 years with the African slave trade. Surprisingly considering that the New and Old World separated 95-106 million years (Myr) ago, the disease rapidly became established due to the presence of endemic susceptible hosts. Reconstructing the phylogenetic relationships within Biomphalaria may provide insights into the successful intercontinental spread of S. mansoni. Parsimony and distance analyses of mitochondrial and nuclear sequences show African taxa to be monophyletic and Neotropical species paraphyletic, with Biomphalaria glabrata forming a separate clade from other Neotropical Biomphalaria, and ancestral to the African taxa. A west to east trans-Atlantic dispersal of a B. glabrata-like taxon, possibly as recently as the Plio-Pleistocene (1.8-3.6 Myr ago) according to a general mitochondrial clock, would fit these observations. Vicariance or an African origin for B. glabrata followed by multiple introductions to South America over the past 500 years with the African slave trade seem unlikely explanations. Knowledge of the phylogenetic relationships among important intermediate host species may prove useful in furthering control measures which exploit genetic differences in susceptibility to parasites, and in elucidating the evolution of schistosome resistance.

show abstract

Section: Discussionmentioning

confidence: 99%

Molecular evidence supports an African affinity of the Neotropical freshwater gastropod,Biomphalaria glabrata, Say 1818, an intermediate host forSchistosoma mansoni

Campbell

Jones

Lockyer

et al. 2000

Proc. R. Soc. Lond. B

View full text Add to dashboard Cite

show abstract

The freshwater snail Bulinus tropicus (Planorbidae) in Namibia, characterised according to chromosome number, enzymes and morphology

1996

View full text Add to dashboard Cite

Freshwater snails collected in central Namibia, south-western Africa, from 15 populations belonging to the Bulinus truncatus/tropicus complex (Planorbidae) are characterised in respect of their chromosome number, morphology, egg proteins and enzymes . The population samples were all consistently diploid and euphallic. The findings are compared with observations on this group of snails in other areas of Africa . It is concluded that the Namibian populations belong to a single species, B. tropicus (Krauss, 1848), of which B. parietalis (Mousson, 1887) is probably a synonym . No evidence was found of any occurrence of the tetraploid species B. truncatus or of snails belonging to the B. africanus group ; lack of a potential intermediate host therefore precludes transmission of Schistosoma haematobium in this area .

show abstract

Genetic variation among laboratory strains of the planorbid snail Biomphalaria glabrata

Mulvey

Vrijenhoek

1981

Biochem Genet

View full text Add to dashboard Cite

Isozymes of laboratory strains of Biomphalaria glabrata have been studied by starch gel electrophoresis. Methods are outlined for adaptation of this technique to the genetic study of these snails. Twenty-eight presumptive gene loci have been identified. Twelve invariant enzymes were observed. Sixteen loci displayed some polymorphism within or among the strains. These polymorphisms were generally widespread among strains from Brazil, Puerto Rico, St. Lucia, and the Dominican Republic. A high degree of intrastrain polymorphism was noted even in some presumably inbred laboratory strains. Crosses between strains were used to demonstrate the genetic basis for the patterns observed at 9 of the 16 polymorphic loci.

show abstract

Experimental taxonomy of biomphalaria (gastropoda: planorbidae)

Cited by 14 publications

References 9 publications

Molecular evidence supports an African affinity of the Neotropical freshwater gastropod,Biomphalaria glabrata, Say 1818, an intermediate host forSchistosoma mansoni

Molecular evidence supports an African affinity of the Neotropical freshwater gastropod,Biomphalaria glabrata, Say 1818, an intermediate host forSchistosoma mansoni

The freshwater snail Bulinus tropicus (Planorbidae) in Namibia, characterised according to chromosome number, enzymes and morphology

Genetic variation among laboratory strains of the planorbid snail Biomphalaria glabrata

Contact Info

Product

Resources

About