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A comprehensive assessment of inbreeding and laboratory adaptation in Aedes aegypti mosquitoes

View ORCID ProfilePerran A. Ross, View ORCID ProfileNancy M. Endersby-Harshman, View ORCID ProfileAry A. Hoffmann
doi: https://doi.org/10.1101/237776
Perran A. Ross
1Bio21 Institute and the School of BioSciences, the University of Melbourne, Parkville, Victoria, Australia
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Nancy M. Endersby-Harshman
1Bio21 Institute and the School of BioSciences, the University of Melbourne, Parkville, Victoria, Australia
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Ary A. Hoffmann
1Bio21 Institute and the School of BioSciences, the University of Melbourne, Parkville, Victoria, Australia
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Abstract

Modified Aedes aegypti mosquitoes reared in laboratories are being released around the world to control wild mosquito populations and the diseases they transmit. Several efforts have failed due to poor competitiveness of the released mosquitoes. We hypothesized that colonized mosquito populations could suffer from inbreeding depression and adapt to laboratory conditions, reducing their performance in the field. We established replicate populations of Ae. aegypti mosquitoes collected from Queensland, Australia, and maintained them in the laboratory for twelve generations at different census sizes. Mosquito colonies maintained at small census sizes (≤100 individuals) suffered from inbreeding depression due to low effective population sizes which were only 25% of the census size as estimated by SNP markers. Populations that underwent full-sib mating for 9 consecutive generations had greatly reduced performance across all traits measured. We compared the established laboratory populations with their ancestral population resurrected from quiescent eggs for evidence of laboratory adaptation. The overall performance of laboratory populations maintained at a large census size (400 individuals) increased, potentially reflecting adaptation to artificial rearing conditions. However most individual traits were unaffected, and patterns of adaptation were not consistent across populations. Differences between replicate populations may indicate that founder effects and drift affect experimental outcomes. Though we find limited evidence of laboratory adaptation, mosquitoes maintained at low population sizes can clearly suffer fitness costs, compromising the success of “rear and release” strategies for arbovirus control.

Footnotes

  • Email addresses: Perran A. Ross: paross{at}student.unimelb.edu.au, Nancy M. Endersby-Harshman: nancye{at}unimelb.edu.au, Ary A. Hoffmann: ary{at}unimelb.edu.au

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 21, 2017.
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A comprehensive assessment of inbreeding and laboratory adaptation in Aedes aegypti mosquitoes
Perran A. Ross, Nancy M. Endersby-Harshman, Ary A. Hoffmann
bioRxiv 237776; doi: https://doi.org/10.1101/237776
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A comprehensive assessment of inbreeding and laboratory adaptation in Aedes aegypti mosquitoes
Perran A. Ross, Nancy M. Endersby-Harshman, Ary A. Hoffmann
bioRxiv 237776; doi: https://doi.org/10.1101/237776

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