Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii
Background & objectives: The emergence and spread of insecticide resistance in African malaria vectors raise concerns over the control of malaria disease. Therefore, the implementation of better control strategies need a thorough understanding of the effects and mechanisms of resistance on vecto...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2019-01-01
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| Series: | Journal of Vector Borne Diseases |
| Subjects: | |
| Online Access: | http://www.jvbd.org/article.asp?issn=0972-9062;year=2019;volume=56;issue=3;spage=207;epage=211;aulast=Sy |
| _version_ | 1819228427793727488 |
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| author | Faty Amadou Sy Ousmane Faye Mawlouth Diallo Ibrahima Dia |
| author_facet | Faty Amadou Sy Ousmane Faye Mawlouth Diallo Ibrahima Dia |
| author_sort | Faty Amadou Sy |
| collection | DOAJ |
| description | Background & objectives: The emergence and spread of insecticide resistance in African malaria vectors raise concerns over the control of malaria disease. Therefore, the implementation of better control strategies need a thorough understanding of the effects and mechanisms of resistance on vector adaptation capacities. We studied the effects of insecticide resistance on the reproductive potential of two laboratory sub-strains of the malaria vector Anopheles coluzzii characterised by phenotypic resistance/susceptibility to DDT.
Methods: The two sub-strains were selected from a laboratory strain of An. coluzzii using WHO test tubes. For each sub-strain, the number of produced and hatched eggs, developmental time, mosquito stages mortality, sex ratio and insemination rates after dissection of spermathecae were compared as measures of reproductive potential.
Results: Overall, the susceptible sub-strain produced higher but not significant mean numbers of eggs. However, the mean numbers of hatched eggs, larvae, pupae and adults were significantly lower than those of the resistant substrain. The mean time from egg–hatching to adult–emergence, egg–flooding to hatching, I instar to pupae and pupae to adult were similar between the two sub-strains. The mortality rates at the pupal stage were significantly different between the two sub-strains. Of the dissected spermathecae, 85.1% of the females from the resistant sub-strain were fertilized compared to 66.1% of the females from the susceptible sub-strain (p <0.0001). The resistant sub-strain produced more females in comparison to the susceptible sub-strain (respective mean sex ratio 1.37 vs 1.03, p = 0.01).
Interpretation & conclusion: The results show differential life history traits between the two sub-strains of the malaria vector An. coluzzii, particularly fertility, insemination rate and sex ratio. They may have varied implications for insecticide resistance spread, monitoring and management; and hence underscore the need of further investigations before any generalization. |
| first_indexed | 2024-12-23T10:57:07Z |
| format | Article |
| id | doaj.art-eadc5eca737f4b7b94d3fc0edd02f30b |
| institution | Directory Open Access Journal |
| issn | 0972-9062 |
| language | English |
| last_indexed | 2024-12-23T10:57:07Z |
| publishDate | 2019-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Vector Borne Diseases |
| spelling | doaj.art-eadc5eca737f4b7b94d3fc0edd02f30b2022-12-21T17:49:45ZengWolters Kluwer Medknow PublicationsJournal of Vector Borne Diseases0972-90622019-01-0156320721110.4103/0972-9062.289401Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzziiFaty Amadou SyOusmane FayeMawlouth DialloIbrahima DiaBackground & objectives: The emergence and spread of insecticide resistance in African malaria vectors raise concerns over the control of malaria disease. Therefore, the implementation of better control strategies need a thorough understanding of the effects and mechanisms of resistance on vector adaptation capacities. We studied the effects of insecticide resistance on the reproductive potential of two laboratory sub-strains of the malaria vector Anopheles coluzzii characterised by phenotypic resistance/susceptibility to DDT. Methods: The two sub-strains were selected from a laboratory strain of An. coluzzii using WHO test tubes. For each sub-strain, the number of produced and hatched eggs, developmental time, mosquito stages mortality, sex ratio and insemination rates after dissection of spermathecae were compared as measures of reproductive potential. Results: Overall, the susceptible sub-strain produced higher but not significant mean numbers of eggs. However, the mean numbers of hatched eggs, larvae, pupae and adults were significantly lower than those of the resistant substrain. The mean time from egg–hatching to adult–emergence, egg–flooding to hatching, I instar to pupae and pupae to adult were similar between the two sub-strains. The mortality rates at the pupal stage were significantly different between the two sub-strains. Of the dissected spermathecae, 85.1% of the females from the resistant sub-strain were fertilized compared to 66.1% of the females from the susceptible sub-strain (p <0.0001). The resistant sub-strain produced more females in comparison to the susceptible sub-strain (respective mean sex ratio 1.37 vs 1.03, p = 0.01). Interpretation & conclusion: The results show differential life history traits between the two sub-strains of the malaria vector An. coluzzii, particularly fertility, insemination rate and sex ratio. They may have varied implications for insecticide resistance spread, monitoring and management; and hence underscore the need of further investigations before any generalization.http://www.jvbd.org/article.asp?issn=0972-9062;year=2019;volume=56;issue=3;spage=207;epage=211;aulast=Syanopheles coluzzii; insecticide resistance; reproductive potential; senegal |
| spellingShingle | Faty Amadou Sy Ousmane Faye Mawlouth Diallo Ibrahima Dia Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii Journal of Vector Borne Diseases anopheles coluzzii; insecticide resistance; reproductive potential; senegal |
| title | Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii |
| title_full | Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii |
| title_fullStr | Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii |
| title_full_unstemmed | Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii |
| title_short | Effects of insecticide resistance on the reproductive potential of two sub-strains of the malaria vector Anopheles coluzzii |
| title_sort | effects of insecticide resistance on the reproductive potential of two sub strains of the malaria vector anopheles coluzzii |
| topic | anopheles coluzzii; insecticide resistance; reproductive potential; senegal |
| url | http://www.jvbd.org/article.asp?issn=0972-9062;year=2019;volume=56;issue=3;spage=207;epage=211;aulast=Sy |
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