Geographical distribution of ploidy
One-way analysis of variance (ANOVA) with Tukey’s mean-separation test
procedure was used to determine the significance of differences in total
range distribution (“extent of occurence of aquatic habitat” ahEOO
km2: Murphy et al., 2019) for each of the three ploidy
states. The same approach was used to examine differences in endemic and
invasive species ploidy between gridcells and ecozones across world
latitude bands. We measured variation in latitudinal range in °absolute
(maximum latitude, minimum latitude, median latitude, and total
latitudinal range) for a subset of 256 species from 11 aquatic plant
families (Alismataceae, Araceae, Eriocaulaceae, Haloragaceae,
Hydrocharitaceae, Isoetaceae, Lentibulariaceae, Nymphaeaceae,
Potamogetonaceae, Ranunculaceae, and Typhaceae) for which both
latitudinal range and ploidy information were available, see procedures
in Murphy et al. (2020). We performed all analyses using R v. 4.0.2 (R
Core Team, 2020).