Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa?
Abstract Background Anopheles gambiae s.s. and An. coluzzii are two of the most important malaria vector species in sub-Saharan Africa. These recently-diverged sibling species do not exhibit intrinsic post-zygotic barriers to reproduction and are thought to be separated by strong assortative mating...
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| Format: | Article |
| Language: | English |
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BMC
2015-11-01
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| Series: | Parasites & Vectors |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13071-015-1190-x |
| _version_ | 1797811850612572160 |
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| author | Abdoulaye Niang Patric S. Epopa Simon P. Sawadogo Hamidou Maïga Lassana Konaté Ousmane Faye Roch K. Dabiré Frédéric Tripet Abdoulaye Diabaté |
| author_facet | Abdoulaye Niang Patric S. Epopa Simon P. Sawadogo Hamidou Maïga Lassana Konaté Ousmane Faye Roch K. Dabiré Frédéric Tripet Abdoulaye Diabaté |
| author_sort | Abdoulaye Niang |
| collection | DOAJ |
| description | Abstract Background Anopheles gambiae s.s. and An. coluzzii are two of the most important malaria vector species in sub-Saharan Africa. These recently-diverged sibling species do not exhibit intrinsic post-zygotic barriers to reproduction and are thought to be separated by strong assortative mating combined with selection against hybrids. At present, little is known about the ecological conditions that determine hybridization and introgression between these cryptic taxa. Methods Swarm segregation and assortative mating were studied in Western Burkina Faso in the villages of Vallée du Kou (VK7) and Soumousso which differed in terms of which sibling species was much rarer than the other, and in Bana where both occurred in similar proportions. Swarms and pairs in copula were collected and genotyped, the proportion of intra and interspecific mating determined, and interspecific sperm transfer checked genetically. Females were collected through larval and adult indoor collections and genotyped or sexed-and-genotyped via a novel multiplex PCR. Results A total of 3,687 males and 220 females were collected and genotyped from 109 swarms. Only 3 swarms were composed of males from both species, and these were from the village of VK7 where An. gambiae s.s. was comparatively rare. Mixed-species pairs captured in copula were only detected in that area and made for 3.62 % and 100 % of mating pairs involving An. coluzzii and An. gambiae s.s. individuals, respectively. The high An. gambiae s.s. cross-mating rate was mirrored by high rates of hybridizations estimated from female larvae and adults indoor collections. This contrasted with Soumousso, where despite being much less common than An. gambiae s.s., An. coluzzii males did not form mixed swarms, females were not found in interspecific swarms or copula and hybridization rates were low in both sibling species. Conclusions These data suggest that ecological conditions leading to rare An. gambiae s.s. in populations dominated by An. coluzzii may promote a breakdown of spatial swarm segregation and assortative mating between the two species. The lower overall hybridization rates observed at the larval and adult indoor stages compared to cross-mating rates support the idea that post-mating selection processes acting against hybrids may occur mostly prior to and/or at the early larval stages. |
| first_indexed | 2024-03-13T07:29:53Z |
| format | Article |
| id | doaj.art-d55bf44ee626478cb76cb1276b762380 |
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| issn | 1756-3305 |
| language | English |
| last_indexed | 2024-03-13T07:29:53Z |
| publishDate | 2015-11-01 |
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| series | Parasites & Vectors |
| spelling | doaj.art-d55bf44ee626478cb76cb1276b7623802023-06-04T11:11:58ZengBMCParasites & Vectors1756-33052015-11-018111010.1186/s13071-015-1190-xDoes extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa?Abdoulaye Niang0Patric S. Epopa1Simon P. Sawadogo2Hamidou Maïga3Lassana Konaté4Ousmane Faye5Roch K. Dabiré6Frédéric Tripet7Abdoulaye Diabaté8Institut de Recherche en Sciences de la SantéInstitut de Recherche en Sciences de la SantéInstitut de Recherche en Sciences de la SantéInstitut de Recherche en Sciences de la SantéLaboratoire d’Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta DiopLaboratoire d’Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta DiopInstitut de Recherche en Sciences de la SantéCentre for Applied Entomology and Parasitology, School of Life Sciences, Keele UniversityInstitut de Recherche en Sciences de la SantéAbstract Background Anopheles gambiae s.s. and An. coluzzii are two of the most important malaria vector species in sub-Saharan Africa. These recently-diverged sibling species do not exhibit intrinsic post-zygotic barriers to reproduction and are thought to be separated by strong assortative mating combined with selection against hybrids. At present, little is known about the ecological conditions that determine hybridization and introgression between these cryptic taxa. Methods Swarm segregation and assortative mating were studied in Western Burkina Faso in the villages of Vallée du Kou (VK7) and Soumousso which differed in terms of which sibling species was much rarer than the other, and in Bana where both occurred in similar proportions. Swarms and pairs in copula were collected and genotyped, the proportion of intra and interspecific mating determined, and interspecific sperm transfer checked genetically. Females were collected through larval and adult indoor collections and genotyped or sexed-and-genotyped via a novel multiplex PCR. Results A total of 3,687 males and 220 females were collected and genotyped from 109 swarms. Only 3 swarms were composed of males from both species, and these were from the village of VK7 where An. gambiae s.s. was comparatively rare. Mixed-species pairs captured in copula were only detected in that area and made for 3.62 % and 100 % of mating pairs involving An. coluzzii and An. gambiae s.s. individuals, respectively. The high An. gambiae s.s. cross-mating rate was mirrored by high rates of hybridizations estimated from female larvae and adults indoor collections. This contrasted with Soumousso, where despite being much less common than An. gambiae s.s., An. coluzzii males did not form mixed swarms, females were not found in interspecific swarms or copula and hybridization rates were low in both sibling species. Conclusions These data suggest that ecological conditions leading to rare An. gambiae s.s. in populations dominated by An. coluzzii may promote a breakdown of spatial swarm segregation and assortative mating between the two species. The lower overall hybridization rates observed at the larval and adult indoor stages compared to cross-mating rates support the idea that post-mating selection processes acting against hybrids may occur mostly prior to and/or at the early larval stages.https://doi.org/10.1186/s13071-015-1190-xAssortative MatingSibling SpeciesMating PairHybridization RateHeterospecific Male |
| spellingShingle | Abdoulaye Niang Patric S. Epopa Simon P. Sawadogo Hamidou Maïga Lassana Konaté Ousmane Faye Roch K. Dabiré Frédéric Tripet Abdoulaye Diabaté Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? Parasites & Vectors Assortative Mating Sibling Species Mating Pair Hybridization Rate Heterospecific Male |
| title | Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? |
| title_full | Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? |
| title_fullStr | Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? |
| title_full_unstemmed | Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? |
| title_short | Does extreme asymmetric dominance promote hybridization between Anopheles coluzzii and Anopheles gambiae s.s. in seasonal malaria mosquito communities of West Africa? |
| title_sort | does extreme asymmetric dominance promote hybridization between anopheles coluzzii and anopheles gambiae s s in seasonal malaria mosquito communities of west africa |
| topic | Assortative Mating Sibling Species Mating Pair Hybridization Rate Heterospecific Male |
| url | https://doi.org/10.1186/s13071-015-1190-x |
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