Comparative phylogeography of Aedes mosquitoes and the role of past climatic change for evolution within Africa

Kelly Bennett, Martha Kaddumukasa, Fortunate Shija, Rousseau Djouaka, Gerald Misinzo, Julius Lutwama, Yvonne Marie Linton, Catherine Walton

Research output: Contribution to journalArticlepeer-review

Abstract

The study of demographic processes involved in species diversification and evolution ultimately provides explanations for the complex distribution of biodiversity on earth, indicates regions important for the maintenance and generation of biodiversity and identifies biological units important for conservation or medical consequence. African and forest biota have both received relatively little attention with regards to understanding their diversification, although one possible mechanism is that this has been driven by historical climate change. To investigate this, we implemented a standard population genetics approach along with Approximate Bayesian Computation, using sequence data from two exon-primed intron-crossing (EPIC) nuclear loci and mitochondrial cytochrome oxidase subunit I, to investigate the evolutionary history of five medically important and inherently forest dependent mosquito species of the genus Aedes. By testing different demographic hypotheses we show that Ae. bromeliae and Ae. lilii fit the same model of lineage diversification, admixture, expansion and recent population structure previously inferred for Ae. aegypti. In addition, analyses of population structure show that Ae. africanus has undergone lineage diversification and expansion while Ae. hansfordi has been impacted by population expansion within Uganda. This congruence in evolutionary history is likely to relate to historical climate-driven habitat change within Africa during the late Pleistocene and Holocene epoch. We find differences in the population structure of mosquitoes from Tanzania and Uganda compared to Benin and Uganda which could relate to differences in the historical connectivity of forests across the continent. Our findings emphasise the importance of recent climate change in the evolution of African forest biota.
Original languageEnglish
JournalEcology and Evolution
Early online date16 Feb 2018
DOIs
Publication statusPublished - 2018

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