Cytotaxonomy, morphology and molecular systematics of the Bioko form of <i>Simulium yahense</i> (Diptera: Simuliidae)

Post, R.J.; Flook, P. K.; Millest, A.L.; Cheke, Robert; McCall, Philip J.; Wilson, Michael D.; Mustapha, M.; Somiari, Stella; Davies, John B.; Mank, Rolf; Geenen, P.L.; Enyong, Peter; Sima, A.; Mas, J.

doi:10.1079/ber2003228

Cited by 25 publications

(42 citation statements)

References 29 publications

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“…The vector on the island is the endemic 'Bioko' form of S. yahense, which is a member of the S. damnosum complex (Cheke et al, 1997;Post et al, 2003). The government of the Republic of Equatorial Guinea and the Spanish International Cooperation Agency have been distributing ivermectin once yearly to the entire population of Bioko since 1995.…”

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confidence: 98%

The cytotaxonomy and morphotaxonomy ofSimulium mengense(Diptera: Simuliidae)

Mustapha

Post

Krüger

2004

Annals of Tropical Medicine & Parasitology

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Human onchocerciasis is hyper-endemic in south-western Cameroon and the island of Bioko. The vector on the island is the endemic 'Bioko' form of Simulium yahense. On the mainland, S. damnosum s.s., S. squamosum and S. mengense are recorded around Mount Cameroon but their contribution to transmission in the area is unclear. As elimination of onchocerciasis, through vector eradication, is a possibility on the island, it is important to be able to identify vector flies which might migrate to Bioko from the mainland. The morphologies of S. damnosum s.s. and S. squamosum are already well known. New cytotaxonomic and morphotaxonomic descriptions of S. mengense, a species which is less well known, are presented. Simulium mengense can be distinguished from the other cytospecies in the area by the presence of tufts of hair-like setae on the larval thorax, the presence of hairs on the subcostal vein of the adult female, and by the scutal pattern of the adult male. Although Vajime and Dunbar described seven fixed inversions in S. mengense, in 1977, nine were observed in the present study. Of the nine, three were the same as Vajime and Dunbar's but the other six were either missed or misinterpreted by them.

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confidence: 98%

The cytotaxonomy and morphotaxonomy ofSimulium mengense(Diptera: Simuliidae)

Mustapha

Post

Krüger

2004

Annals of Tropical Medicine & Parasitology

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“…In 2005 the unique endemic Bioko form of S. yahense [25] was eradicated from the island of Bioko (formerly known as Fernando Po), Equatorial Guinea, in the Gulf of Guinea [12].…”

Section: Equatorial Guineamentioning

confidence: 99%

Factors affecting onchocerciasis transmission: lessons for infection control

Cheke

2017

Expert Review of Anti-infective Therapy

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Introduction: Onchocerca volvulus infects in excess of 15 million people. The vectors are Simulium blackflies, varieties of which differ in their ecologies, behaviour and vectorial abilities. Control of the vectors and mass administrations of ivermectin have succeeded in reducing prevalences with elimination achieved in some foci, particularly in Central and southern America. In Africa, progress towards elimination has been less successful.Areas covered: Even with community directed treatment with ivermectin (CDTI), control has been difficult in African areas with initial prevalences in excess of 55%, especially if only annual treatments are dispensed. This is partly attributable to insufficient coverage, but the appearance of incipiently resistant non-responding parasites and lack of attention to vector biology in modelling and planning outcomes of intervention programmes have also played their parts, with recrudescence now appearing in some treated areas. Expert commentary:The biology of onchocerciasis is complex involving different vectors with differing abilities to transmit parasites, diverse pathologies related to geographical and parasite variations and endosymbionts in both parasite and vector. Modelling to predict epidemiological and control outcomes is addressing this complexity but more attention needs to be given to the vectors' roles to further understanding of where and when control measures will succeed.

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“…These applications include: (i) restriction fragment length polymorphism (RFLP), e.g., Post et al (2003) in the Simulium damnosum group, Zhu et al (1998) in Simulium vittatum; (ii) random amplification of polymorphic DNA (RAPD) - Duncan et al (2004) in S. vittatum; (iii) directed heteroduplex analysis (DHDA) in S. damnosum s.l. ; or (iv) inter-simple sequence repeats (ISSR) - Dušinský et al (2006) in Prosimulium spp.…”

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confidence: 99%

Population genetic structure of Simulium degrangei (Diptera: Simuliidae) from Western Carpathians

et al. 2012

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Simulium degrangei Dorier & Grenier, 1960 was recorded in southern and central Europe and in the Crimea and Caucasus. Its distribution pattern is scattered. The variability of the mtDNA gene encoding cytochrome oxidase I was studied in populations of S. degrangei from the Western Carpathians in Slovakia and in the northern Hellenides of Greece. In the analyzed samples, 21 haplotypes were recorded, of which twenty were private and occurred in only one mountain range, but one haplotype was found in all three studied populations from the Western Carpathians. Both haplotypes from the Hellenides were private, but these were not isolated and they fit into the haplotype network of the Western Carpathians. Statistics of genetic variability, different designs of analysis of molecular variation with non-significant differences and the pair-wise genetic distances support the hypothesis that there are no differences between the analyzed populations. Similarly, using nested clade phylogeographical analysis, no genetic-geographical structure was found.

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Cytotaxonomy, morphology and molecular systematics of the Bioko form of Simulium yahense (Diptera: Simuliidae)

Cited by 25 publications

References 29 publications

The cytotaxonomy and morphotaxonomy ofSimulium mengense(Diptera: Simuliidae)

The cytotaxonomy and morphotaxonomy ofSimulium mengense(Diptera: Simuliidae)

Factors affecting onchocerciasis transmission: lessons for infection control

Population genetic structure of Simulium degrangei (Diptera: Simuliidae) from Western Carpathians

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