Life-history traits indicate local adaptation of the schistosome parasite, Schistosoma mansoni, to its snail host, Biomphalaria pfeifferi

Ibikounlé, Moudachirou; Mouahid, Gabriel; Nguema, Rodrigue Mintsa; Sakiti, N.G.; Kindé-Gasard, D.; Massougbodji, Achille; Moné, Hélène

doi:10.1016/j.exppara.2012.09.020

Cited by 20 publications

(20 citation statements)

References 13 publications

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“…For example, Ibikounlé et al . showed that the prepatent period was significantly shorter for S. mansoni and for S. haematobium from Toho‐Todougba (Benin) on their sympatric snail hosts B. pfeifferi and Bulinus globosus, respectively, compared to the pre‐patent periods obtained for different allopatric populations of the snail hosts . The “allopatric” behaviour of the nocturnal chronotype supports the hypothesis of its recent appearance.…”

Section: Discussionsupporting

confidence: 59%

Host‐parasite life‐histories of the diurnalvs. nocturnal chronotypes ofSchistosoma mansoni: adaptive significance

Mouahid

Nguema

Mashikhi

et al. 2019

Tropical Med Int Health

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objectives To optimise host-to-host transmission, digenean trematodes (parasites) synchronise their cercarial emission patterns with the aquatic activities of their vertebrate hosts. Schistosoma mansoni has two different circadian chronotypes: a diurnal shedding pattern with a mean peak occurring at 11:00 h, and a nocturnal shedding pattern with a mean peak occurring at 20:00 h. We analysed the life-history variations between these two chronotypes at the levels of the parasite and its hosts.methods For each chronotype, we quantified three life-history traits related to the parasite (prepatent period, infection rate and cercarial production) and analysed the morphometry and the morphology of the parasite eggs; we also quantified three life-history traits related to the snail intermediate host (shell diameter, fecundity and survival rate) and one life-history trait related to the experimental definitive host (survival rate). A phylogeny based on the mitochondrial cytochromeoxidase gene was made on samples of both chronotypes.results Life-history analysis revealed significant variations between the two chronotypes. Lifehistory traits were optimal for both the parasite and the snail host for the diurnal chronotype compared to the nocturnal one. The new chronotype behaved like an allopatric population towards its snail host. Phylogenetic analysis supports the hypothesis of a lateral transfer of S. mansoni from humans to Rattus rattus. These results were interpreted in terms of an ongoing sympatric speciation.conclusion The nocturnal chronotype of S. mansoni showed non-adapted life-history traits in its relation with the snail intermediate host Biomphalaria pfeifferi. The emergence of this new phenotype is probably linked to divergent natural selection.keywords Schistosoma mansoni, nocturnal chronotype, cercarial emergence pattern, circadian rhythm, sympatric speciation

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Section: Discussionsupporting

confidence: 59%

Host‐parasite life‐histories of the diurnalvs. nocturnal chronotypes ofSchistosoma mansoni: adaptive significance

Mouahid

Nguema

Mashikhi

et al. 2019

Tropical Med Int Health

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“…Nonetheless, genetic variation in bioenergetic parameters could identify physiological strategies exploited by coevolving schistosomes and snails (Ibikounlé et al . ).…”

Section: Discussionmentioning

confidence: 97%

Bioenergetic theory predicts infection dynamics of human schistosomes in intermediate host snails across ecological gradients

et al. 2018

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Epidemiological dynamics depend on the traits of hosts and parasites, but hosts and parasites are heterogeneous entities that exist in dynamic environments. Resource availability is a particularly dynamic and potent environmental driver of within-host infection dynamics (temporal patterns of growth, reproduction, parasite production and survival). We developed, parameterised and validated a model for resource-explicit infection dynamics by incorporating a parasitism module into dynamic energy budget theory. The model mechanistically explained the dynamic multivariate responses of the human parasite Schistosoma mansoni and its intermediate host snail to variation in resources and host density. At the population level, feedbacks mediated by resource competition could create a unimodal relationship between snail density and human risk of exposure to schistosomes. Consequently, weak snail control could backfire if reductions in snail density release remaining hosts from resource competition. If resource competition is strong and relevant to schistosome production in nature, it could inform control strategies.

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“…La prévalence de ces parasitoses varie selon les régions mais elle est beaucoup plus élevée en zone tropicale. Au Bénin, les études épidémiologiques encore parcellaires révèlent la présence de deux espèces (Ibikounlé et al, 2009 ;Ibikounlé et al, 2012 ;Ibikounlé et al, 2013). Toutefois, les résultats d'une étude récente mentionnent des phénomènes d'introgression génique entre S. haematobium et S. guineensis ; ce qui laisse présager la présence d'une troisième espèce de schistosomes humains au Bénin.…”

Section: Resumeunclassified

Épidémiologie de la bilharziose urinaire et des geohelminthiases chez les jeunes scolaires des zones lacustres de la commune de So-Ava, sud-Bénin

Ibikounlé¹,

Satoguina²,

Fachinan³

et al. 2013

J. App. Bioscience.

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Life-history traits indicate local adaptation of the schistosome parasite, Schistosoma mansoni, to its snail host, Biomphalaria pfeifferi

Cited by 20 publications

References 13 publications

Host‐parasite life‐histories of the diurnalvs. nocturnal chronotypes ofSchistosoma mansoni: adaptive significance

Host‐parasite life‐histories of the diurnalvs. nocturnal chronotypes ofSchistosoma mansoni: adaptive significance

Bioenergetic theory predicts infection dynamics of human schistosomes in intermediate host snails across ecological gradients

Épidémiologie de la bilharziose urinaire et des geohelminthiases chez les jeunes scolaires des zones lacustres de la commune de So-Ava, sud-Bénin

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