Université de Neuchâtel

Farmers' practices, metapopulation dynamics, and conservation of agricultural biodiversity on-farm: a case study of sorghum among the Duupa in sub-sahelian Cameroon

Alvarez, Nadir ; Garine, Eric ; Khasah, Celestin ; Dounias, Edmond ; Hossaert-McKey, Martine ; McKey, Doyle

In: Biological Conservation, 2005, vol. 121, no. 4, p. 533-543

In many traditionally managed agroecosystems, populations of domesticated plants maintain high levels of genetic diversity. The threat of erosion of this diversity is a current conservation concern, motivating studies of how diversity can be maintained by in situ conservation measures. Precisely how the biological traits of plants and the cultural practices of farmers act on fundamental...

Université de Neuchâtel

Ancient and recent evolutionary history of the bruchid beetle, Acanthoscelides obtectus Say, a cosmopolitan pest of beans

Alvarez, Nadir ; McKey, Doyle ; Hossaert-McKey, Martine ; Born, Céline ; Mercier, Lény ; Benrey, Betty

In: Molecular Ecology, 2005, vol. 14, no. 4, p. 1015–1024

Acanthoscelides obtectus Say is a bruchid species of Neotropical origin, and is specialized on beans of the Phaseolus vulgaris L. group. Since the domestication and diffusion of beans, A. obtectus has become cosmopolitan through human-mediated migrations and is now a major pest in bean granaries. Using phylogeographic methods applied to mitochondrial DNA (mtDNA) and nuclear...

Université de Neuchâtel

Sibling species of bean bruchids: a morphological and phylogenetic study of Acanthoscelides obtectus Say and Acanthoscelides obvelatus Bridwell

Alvarez, Nadir ; Hossaert-McKey, Martine ; Rasplus, J.-Y. ; McKey, Doyle ; Mercier, Lény ; Soldati, L. ; Aebi, Alexandre ; Shani, T. ; Benrey, Betty

In: Journal of Zoological Systematics and Evolutionary Research, 2005, vol. 43, no. 1, p. 29-37

Acanthoscelides Schilsky is a large genus of neotropical bruchid beetles, in which most species show host plant specialization. Acanthoscelides obtectus and Acanthoscelides obvelatus are two sibling species specialized on Phaseolus beans, and are therefore considered pests. Up to now, the status of these two taxa has remained unclear, the few studies conducted having failed...

Université de Neuchâtel

Phylogeographic support for horizontal gene transfer involving sympatric bruchid species

Alvarez, Nadir ; Benrey, Betty ; Hossaert-McKey, Martine ; Grill, Andrea ; McKey, Doyle ; Galtier, Nicolas

In: Biology Direct, 2006, vol. 1, no. 21, p. 1-11

Background We report on the probable horizontal transfer of a mitochondrial gene, cytb, between species of Neotropical bruchid beetles, in a zone where these species are sympatric. The bruchid beetles Acanthoscelides obtectus, A. obvelatus, A. argillaceus and Zabrotes subfasciatus develop on various bean species in Mexico. Whereas A....