Population Dynamics and Genetics of Gerbillus nigeriae in Central Sahel: Implications for Rodent Pest Control
Ecology and Evolutionary Biology
Volume 4, Issue 4, December 2019, Pages: 45-54
Received: Sep. 17, 2019; Accepted: Oct. 21, 2019; Published: Oct. 31, 2019
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Hima Karmadine, Departement of Biology, Abdou Moumouni University (UAM), Niamey, Niger
Granjon Laurent, Center of Biology for Population Management (CBGP), Campus International de Baillarguet, Montferrier-sur-Lez, France
Gauthier Philippe, Center of Biology for Population Management (CBGP), Campus International de Baillarguet, Montferrier-sur-Lez, France
Ndiaye Arame, Laboratoy for Sudano-Sahelian Animal Populations, BIOPASS (UCAD-IRD-CIRAD-ISRA), Dakar, Sénégal
Brouat Carine, Center of Biology for Population Management (CBGP), Campus International de Baillarguet, Montferrier-sur-Lez, France
Dobigny Gauthier, Center of Biology for Population Management (CBGP), Campus International de Baillarguet, Montferrier-sur-Lez, France
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Gerbillus nigeriae is a sand-dwelling and semi-arid adapted rodent species restricted to the West African Sahel where it causes extensive damages to cereal crops such as millet and sorghum. It also displays one of the most extensive floating chromosomal polymorphisms currently known in mammals, showing a non-random spatial distribution of diploid numbers (2N). We combined population dynamics and genetics to determine dispersal and mobility parameters of G. nigeriae in the species distribution range characterized by low 2N. To do so, we performed a three-year long population survey at Gangara, in the central east Niger. We used both time-dependent monitoring trough capture-mark-recapture (CMR) methods and genetic analyses performed on the 134 monitored individuals. CMR results showed low to very low population densities (maximum 27.5 individuals/ha) throughout the study. Abundance cycle was single-phased and strongly dependent on rainfall patterns. Mobility parameters showed very low individual mobility, with means of distance between successive (re) captures (DRS) and maximal distance between (re) captures (DMR) of 7.8 and 14.4 meters, respectively. Genetic analyses revealed significant isolation by distance as well as spatial structuration, thus confirming poor dispersal capacity. Our results are discussed in terms of rodent pest control in arid areas of Niger where cereal crops production is crucial for human food security.
Pest Rodent, Gerbillus nigeriae, Abundance, Mobility, Dispersal, Rodent Control, Niger
To cite this article
Hima Karmadine, Granjon Laurent, Gauthier Philippe, Ndiaye Arame, Brouat Carine, Dobigny Gauthier, Population Dynamics and Genetics of Gerbillus nigeriae in Central Sahel: Implications for Rodent Pest Control, Ecology and Evolutionary Biology. Vol. 4, No. 4, 2019, pp. 45-54. doi: 10.11648/j.eeb.20190404.11
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