Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya
Abstract Background Despite increasing documentation of insecticide resistance in malaria vectors against public health insecticides in sub-Saharan Africa, there is a paucity of information on the potential fitness costs of pyrethroid resistance in malaria vectors, which is important in improving th...
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ftdoajarticles:oai:doaj.org/article:7d8c2912a5fa44a0a261bd23e36846e8 2023-05-15T15:17:56+02:00 Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya Joyce K. Osoro Maxwell G. Machani Eric Ochomo Christine Wanjala Elizabeth Omukunda Stephen Munga Andrew K. Githeko Guiyun Yan Yaw A. Afrane 2021-06-01T00:00:00Z https://doi.org/10.1186/s12936-021-03798-9 https://doaj.org/article/7d8c2912a5fa44a0a261bd23e36846e8 EN eng BMC https://doi.org/10.1186/s12936-021-03798-9 https://doaj.org/toc/1475-2875 doi:10.1186/s12936-021-03798-9 1475-2875 https://doaj.org/article/7d8c2912a5fa44a0a261bd23e36846e8 Malaria Journal, Vol 20, Iss 1, Pp 1-7 (2021) Anopheles gambiae Insecticide resistance Fitness Larval life-traits Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 article 2021 ftdoajarticles https://doi.org/10.1186/s12936-021-03798-9 2022-12-31T06:52:26Z Abstract Background Despite increasing documentation of insecticide resistance in malaria vectors against public health insecticides in sub-Saharan Africa, there is a paucity of information on the potential fitness costs of pyrethroid resistance in malaria vectors, which is important in improving the current resistant management strategies. This study aimed to assess the fitness cost effects of insecticide resistance on the development and survival of immature Anopheles gambiae from western Kenya. Methods Two-hour old, first instar larvae (L1) were introduced and raised in basins containing soil and rainwater in a semi-field set-up. Each day the number of surviving individuals per larval stage was counted and their stage of development were recorded until they emerged as adults. The larval life-history trait parameters measured include mean larval development time, daily survival and pupal emergence. Pyrethroid-resistant colony of An. gambiae sensu stricto and susceptible colony originating from the same site and with the same genetic background were used. Kisumu laboratory susceptible colony was used as a reference. Results The resistant colony had a significantly longer larval development time through the developmental stages than the susceptible colony. The resistant colony took an average of 2 days longer to develop from first instar (L1) to fourth instar (L4) (8.8 ± 0.2 days) compared to the susceptible colony (6.6 ± 0.2 days). The development time from first instar to pupa formation was significantly longer by 3 days in the resistant colony (10.28 ± 0.3 days) than in susceptible colony (7.5 ± 0.2 days). The time from egg hatching to adult emergence was significantly longer for the resistant colony (12.1 ± 0.3 days) than the susceptible colony (9.6 ± 0.2 days). The pupation rate (80%; 95% (CI: 77.5–83.6) vs 83.5%; 95% (CI: 80.6–86.3)) and adult emergence rate (86.3% vs 92.8%) did not differ between the resistant and susceptible colonies, respectively. The sex ratio of the females to males for the resistant ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Malaria Journal 20 1 |
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ftdoajarticles |
language |
English |
topic |
Anopheles gambiae Insecticide resistance Fitness Larval life-traits Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
spellingShingle |
Anopheles gambiae Insecticide resistance Fitness Larval life-traits Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 Joyce K. Osoro Maxwell G. Machani Eric Ochomo Christine Wanjala Elizabeth Omukunda Stephen Munga Andrew K. Githeko Guiyun Yan Yaw A. Afrane Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
topic_facet |
Anopheles gambiae Insecticide resistance Fitness Larval life-traits Arctic medicine. Tropical medicine RC955-962 Infectious and parasitic diseases RC109-216 |
description |
Abstract Background Despite increasing documentation of insecticide resistance in malaria vectors against public health insecticides in sub-Saharan Africa, there is a paucity of information on the potential fitness costs of pyrethroid resistance in malaria vectors, which is important in improving the current resistant management strategies. This study aimed to assess the fitness cost effects of insecticide resistance on the development and survival of immature Anopheles gambiae from western Kenya. Methods Two-hour old, first instar larvae (L1) were introduced and raised in basins containing soil and rainwater in a semi-field set-up. Each day the number of surviving individuals per larval stage was counted and their stage of development were recorded until they emerged as adults. The larval life-history trait parameters measured include mean larval development time, daily survival and pupal emergence. Pyrethroid-resistant colony of An. gambiae sensu stricto and susceptible colony originating from the same site and with the same genetic background were used. Kisumu laboratory susceptible colony was used as a reference. Results The resistant colony had a significantly longer larval development time through the developmental stages than the susceptible colony. The resistant colony took an average of 2 days longer to develop from first instar (L1) to fourth instar (L4) (8.8 ± 0.2 days) compared to the susceptible colony (6.6 ± 0.2 days). The development time from first instar to pupa formation was significantly longer by 3 days in the resistant colony (10.28 ± 0.3 days) than in susceptible colony (7.5 ± 0.2 days). The time from egg hatching to adult emergence was significantly longer for the resistant colony (12.1 ± 0.3 days) than the susceptible colony (9.6 ± 0.2 days). The pupation rate (80%; 95% (CI: 77.5–83.6) vs 83.5%; 95% (CI: 80.6–86.3)) and adult emergence rate (86.3% vs 92.8%) did not differ between the resistant and susceptible colonies, respectively. The sex ratio of the females to males for the resistant ... |
format |
Article in Journal/Newspaper |
author |
Joyce K. Osoro Maxwell G. Machani Eric Ochomo Christine Wanjala Elizabeth Omukunda Stephen Munga Andrew K. Githeko Guiyun Yan Yaw A. Afrane |
author_facet |
Joyce K. Osoro Maxwell G. Machani Eric Ochomo Christine Wanjala Elizabeth Omukunda Stephen Munga Andrew K. Githeko Guiyun Yan Yaw A. Afrane |
author_sort |
Joyce K. Osoro |
title |
Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
title_short |
Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
title_full |
Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
title_fullStr |
Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
title_full_unstemmed |
Insecticide resistance exerts significant fitness costs in immature stages of Anopheles gambiae in western Kenya |
title_sort |
insecticide resistance exerts significant fitness costs in immature stages of anopheles gambiae in western kenya |
publisher |
BMC |
publishDate |
2021 |
url |
https://doi.org/10.1186/s12936-021-03798-9 https://doaj.org/article/7d8c2912a5fa44a0a261bd23e36846e8 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Malaria Journal, Vol 20, Iss 1, Pp 1-7 (2021) |
op_relation |
https://doi.org/10.1186/s12936-021-03798-9 https://doaj.org/toc/1475-2875 doi:10.1186/s12936-021-03798-9 1475-2875 https://doaj.org/article/7d8c2912a5fa44a0a261bd23e36846e8 |
op_doi |
https://doi.org/10.1186/s12936-021-03798-9 |
container_title |
Malaria Journal |
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20 |
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1 |
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1766348179664535552 |