Data set of the ancestral populations 
*dat22_Pau_CG
*dat22_Spite_CG
*dat22_PTS_Pau_CG
*dat22_PTS_Spite_CG

Data set of the descendant populations before common garden
*dat05_Pau_CG
*dat05_Spite_CG
*dat05_PTS_Pau_CG
*dat05_PTS_Spite_CG

Data set of the descendant population in the common garden
*dat09_Pau
*dat09_Spite
*dat09_PTS_Pau
*dat09_PTS_Spite

In all data sets we have the following columns
"file": unique ID of video sample
"mean_grey": grey color of individual (not used here)
"sd_grey": standard deviation of grey color of individual
"mean_area": average area of individual (bio-area here)
"sd_area": standard deviation of area individual
"mean_perimeter": average perimeter of individual (not used here)
"sd_perimeter": standard deviation of perimeter of individual
"mean_major": average length of individual (measured along longest cell axis) (not used here)
"sd_major": standard deviation of length of individual
"mean_minor": average length of individual (measured along shortest cell axis) (not used here)
"sd_minor": standard deviation of length of individual
"mean_ar": average aspect ratio (ratio of longest versus shortest cell axis) (cell ratio here)
"sd_ar": standard deviation of aspect ratio
"mean_turning": average turning of an individual while swimming (not used here)
"sd_turning": standard deviation of turning of an individual
"duration": /       
"N_frames": frames in which an individual appears
"max_net": / 
"net_disp": net displacement (not used here)
"net_speed": net swimming speed (not used here)
"gross_disp": gross displacement (not used here)
"gross_speed": gross swimming speed (used here as dispersal ability)
"max_step": /
"min_step": /         
"sd_step": /
"sd_gross_speed": standard deviation of gross swimming speed
"max_gross_speed": maximum gross swimming speed
"min_gross_speed": minimum gross swimming speed
"id": unique ID of each individual
"ID_original": Original ID linked to the unique ID of the selection experiment
"Species": the name of the species (Pau - Paramecium, Tet - Tetrahymena, Spite - Spirostomum or PTS - community with all three species)
"Salinity_Origin": the salinity condition used in the selection experiment
"Salinity_Destination": the salinity condition used in the common garden experiment
"replicate": the replicate number
"ID_new": unique ID of each sample
"Sample_ID": unique ID of each sample 
"eccentricity": same as aspect ratio
"Community": indicator variable indicating whether we have a mono or mixed species culture
"Density": density of the focal species
"Bio.Fraction": relative biomass of a species
"Bio.Fraction.other": relative biomass of the remaining species
"Density.other": density of the remaining species