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Titolo:
Temephos-resistant larvae of Simulium sanctipauli associated with a distinctive new chromosome inversion in untreated rivers of south-western Ghana
Autore:
Osei-Atweneboana, MY; Wilson, MD; Post, RJ; Boakye, DA;
Indirizzi:
Univ Ghana, Noguchi Mem Inst Med Res, Parasitol Unit, Legon, Ghana Univ Ghana Legon Ghana i Mem Inst Med Res, Parasitol Unit, Legon, Ghana Nat Hist Museum, Dept Entomol, London SW7, England Nat Hist Museum London England SW7 um, Dept Entomol, London SW7, England Leiden Univ, Dept Populat Biol, NL-2300 RA Leiden, Netherlands Leiden Univ Leiden Netherlands NL-2300 RA NL-2300 RA Leiden, Netherlands
Titolo Testata:
MEDICAL AND VETERINARY ENTOMOLOGY
fascicolo: 1, volume: 15, anno: 2001,
pagine: 113 - 116
SICI:
0269-283X(200103)15:1<113:TLOSSA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTROL PROGRAM AREA; INSECTICIDE RESISTANCE; DAMNOSUM COMPLEX; DIPTERA; IDENTIFICATION; MEMBERS; AFRICA;
Keywords:
Simulium sanctipauli; agrochemicals run-off; chromosome inversion; cytotaxonomy; insecticide resistance; larvicides; onchocerciasis; pesticide pollution; polytene chromosomes; rivers; sibling species; temephos; vector control; Tano river; Ghana;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Wilson, MD Univ Ghana, Noguchi Mem Inst Med Res, Parasitol Unit, POB LG581, Legon, Ghana Univ Ghana POB LG581 Legon Ghana nit, POB LG581, Legon, Ghana
Citazione:
M.Y. Osei-Atweneboana et al., "Temephos-resistant larvae of Simulium sanctipauli associated with a distinctive new chromosome inversion in untreated rivers of south-western Ghana", MED VET ENT, 15(1), 2001, pp. 113-116

Abstract

Larvae of the Simulium damnosum Theobald complex (Diptera: Simuliidae) were sampled in June 1996 from two sites in south-west Ghana where larvicidinghas not been applied: Sutri Rapids on the Tano river (05 degrees 23'N 02 degrees 38'W) and Sekyere-Heman on the Pra river (05 degrees 11'N 01 degrees35'W). All specimens were identified as Simulium sanctipauli Vajime & Dunbar sensu stricto (Diptera: Simuliidae). Bioassays with temephos (organophosphorus larvicide employed by the Onchocerciasis Programme for systematic treatment of most rivers across West Africa since the 1970s) showed about five-fold resistance in the Tano population (LC95 2.37-3.14 mg/L) and slight tolerance to temephos in the Pra population (LC95 0.67-0.76 mg/L), vs. the diagnostic concentration of 0.625 mg/L. Larval salivary polytene chromosomesof S. sanctipauli showed fixed inversions 1S-24/24, standard IIL-6 and a new inversion IL/36 polymorphism at Sutri on the Tano. These karyotype characteristics differ from those of temephos-resistant S. sanctipauli in riversof Cote d'Ivoire and other sites on the Tano in Ghana. Thus, temephos resistance in S, sanctipauli at Sutri is associated with distinct chromosomal configurations, showing that immigration was unlikely. This resistance couldhave been locally selected by exposure of S. sanctipauli larval populations to agrochemicals run-off from cocoa, coffee and oil plantations flanking the rivers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 05:44:40