Data and output of R scripts for the article "Geographical expansion and native species displacement: the invasion of Cecropia peltata L. (Urticaceae) in Cameroon"

Data table D1.csv describes the numbers and densities of Cecropia peltata and Musanga cecropioides trees counted along road transects during a survey conducted in 2018. The following fields are: Date: in format day.month.year GPSstart: GPS code when starting the transect GPSend: GPS code when ending the transect DistOdometer_km: length of the road transect according to the car odometer in kilometers DistStraightline: straigth line distance between start and end points in kilometers long: mean longitude East between start and end points in degrees decimal lat: mean latitude North between start and end points in degrees decimal Elev: mean elevation between start and end points in meters Ncec: number of Cecropia peltata trees counted along the road transect Nmus: number of Musanga cecropioides trees counted along the road transect Ntot: total number of Cecropia peltata and Musanga cecropioides trees counted along the road transect Dcec: density of Cecropia peltata trees along the road transect (number per kilometer) Dmus: density of Musanga cecropioides trees along the road transect (number per kilometer) DistLimbe: distance to the town of Limbe in kilometers DirLimbe: main cardinal direction with respect to the town of Limbe (E: East of Limbe, N: North of Limbe, S&W: South or West of Limbe) Data table D2.csv describes the numbers of Cecropia peltata and Musanga cecropioides trees counted along road transects initially surveyed by Doyle McKey in 1986 and surveyed again in 2008 by Bruce Webber and collaborators, and in 2018 by Claire Baudoux, Narcisse Kamdem and Olivier Hardy. The following fields are: year: year of survey DistRoad_km: length of the road transect in kilometers long: mean longitude East between start and end of road transect in degrees decimal lat: mean latitude North between start and end of road transect in degrees decimal Ncec: number of Cecropia peltata trees counted along the road transect Nmus: number of Musanga cecropioides trees counted along the road transect Ntot: total number of Cecropia peltata and Musanga cecropioides trees counted along the road transect Pcec: proportion of Cecropia peltata trees counted Fyear: year of survey (as a factor) year_1986: number of years since the first survey of 1986 DistLimbe: distance to the town of Limbe in kilometers R script_Statistical models.pdf describes the output of the statistical models used in the article, recalling the R function used.