title: Using neutral cline decay to estimate contemporary dispersal: a generic tool and its application to a major crop pathogen.
abstract: Dispersal is a key parameter of adaptation, invasion and persistence. Yet standard population genetics inference methods hardly distinguish it from drift and many species cannot be studied by direct mark-recapture methods. Here, we introduce a method using rates of change in cline shapes for neutral markers to estimate contemporary dispersal. We apply it to the devastating banana pest Mycosphaerella fijiensis, a wind-dispersed fungus for which a secondary contact zone had previously been detected using landscape genetics tools. By tracking the spatio-temporal frequency change of 15 microsatellite markers, we find that σ, the standard deviation of parent-offspring dispersal distances, is 1.2 km/generation(1/2) . The analysis is further shown robust to a large range of dispersal kernels. We conclude that combining landscape genetics approaches to detect breaks in allelic frequencies with analyses of changes in neutral genetic clines offers a powerful way to obtain ecologically relevant estimates of dispersal in many species.
authors.affiliation: CIRAD, UMR BGPI, Campus international de Baillarguet, TA A-54K, F-34398, Montpellier Cedex 5, France. a.rieux@ucl.ac.uk
authors.forename: A
authors.initials: A
authors.lastname: Rieux
authors.forename: T
authors.initials: T
authors.lastname: Lenormand
authors.forename: J
authors.initials: J
authors.lastname: Carlier
authors.forename: L
authors.initials: L
authors.lastname: de Lapeyre de Bellaire
authors.forename: V
authors.initials: V
authors.lastname: Ravigné
mesh_terms: D001203:Ascomycota / Q000235:genetics / Q000472:pathogenicity* / Q000502:physiology*; D002163:Cameroon; D003198:Computer Simulation; D005787:Gene Frequency; D005828:Genetics, Population; D016013:Likelihood Functions; D018895:Microsatellite Repeats; D008954:Models, Biological; D028521:Musa / Q000382:microbiology*; D010935:Plant Diseases / Q000382:microbiology