Genetic distinction between contiguous urban and rural multimammate mice in Tanzania despite gene flow
Jazyk angličtina Země Velká Británie, Anglie Médium print-electronic
Typ dokumentu časopisecké články
PubMed
27306876
DOI
10.1111/jeb.12919
Knihovny.cz E-zdroje
- Klíčová slova
- Mastomys natalensis *, IMa2 *, Tanzania *, population genetics *, spatial genetics *, synanthropy *, urbanization *,
- MeSH
- migrace zvířat * MeSH
- mikrosatelitní repetice * MeSH
- Murinae genetika MeSH
- myši MeSH
- populační dynamika MeSH
- tok genů * MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Tanzanie MeSH
Special conditions are required for genetic differentiation to arise at a local geographical scale in the face of gene flow. The Natal multimammate mouse, Mastomys natalensis, is the most widely distributed and abundant rodent in sub-Saharan Africa. A notorious agricultural pest and a natural host for many zoonotic diseases, it can live in close proximity to humans and appears to compete with other rodents for the synanthropic niche. We surveyed its population genetic structure across a 180-km transect in central Tanzania along which the landscape varied between agricultural land in a rural setting and natural woody vegetation, rivers, roads and a city (Morogoro). We sampled M. natalensis across 10 localities and genotyped 15 microsatellite loci from 515 individuals. Hierarchical STRUCTURE analyses show a K-invariant pattern distinguishing Morogoro suburbs (located in the centre of the transect) from nine surrounding rural localities. Landscape connectivity analyses in Circuitscape and comparison of rainfall patterns suggest that neither geographical isolation nor natural breeding asynchrony could explain the genetic differentiation of the urban population. Using the isolation-with-migration model implemented in IMa2, we inferred that a split between suburban and rural populations would have occurred recently (<150 years ago) with higher urban effective population density consistent with an urban source to rural sink of effective migration. The observed genetic differentiation of urban multimammate mice is striking given the uninterrupted distribution of the animal throughout the landscape and the high estimates of effective migration (2Ne M = 3.0 and 29.7), suggesting a strong selection gradient across the urban boundary.
Department of Zoology University of South Bohemia České Budějovice Czech Republic
Evolutionary Ecology Group Department of Biology University of Antwerp Antwerp Belgium
Pest Management Centre Sokoine University of Agriculture Morogoro Tanzania
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