Table 1.
Seed collection locations of Lythrum salicaria used in the common garden studies in cold vs. hot gardens (Třeboň, Czech Republic vs. Lafayette, Louisiana).
Table 2.
ANOVA table of the effects of sources of variation on tissue biomass (g) of Lythrum salicaria including total (a), above-ground (b), below-ground (c) and inflorescence (d).
Fig 1.
Oven-dried biomass (g) of various tissue types of Lythrum salicaria in two experimental gardens in Třeboň, Czech Republic vs. Lafayette, Louisiana (cold/dry vs. hot/humid garden, respectively) including(a-b) above-ground stem/leaf, (c-d) below-ground root, (e-f) above-ground inflorescence and (g-h) total above and below-ground biomass pot-1 (g) versus latitude of seed origin during 2006, 2007, and 2008 (light gray, gray and black lines, respectively).
Populations from seeds collected on the same continent as the common garden are designated in bold font. See Table 1 for the ANOVA table.
Fig 2.
Reaction norms for total biomass (g) constructed from plants grown from the seeds of the same maternal plant grown in the gardens in Třeboň, Czech Republic and Lafayette, Louisiana (cold/dry vs. hot/humid garden).
Individual maternal plants are depicted by a gradient of blue to red lines.
Fig 3.
Reaction norms for log inflorescence biomass (g) constructed from plants grown from the seeds of the same maternal plant grown in the gardens in Třeboň Czech Republic and Lafayette Louisiana (cold vs. hot garden) in 2006–2008.
Individual maternal plant numbers are depicted by a gradient of blue to red lines.
Fig 4.
Lythrum salicaria heights (cm) in wetlands of Eurasia vs. North America as measured by volunteers in the Purple Loosestrife Volunteer Network (r2 = 0.361, p < 0.0001).
The interpolated lines represent estimated plant heights for Eurasia and North America (filled black circle/line vs. gray circle/line, respectively). Means of measured heights latitude-1 are represented by stars and triangles (Eurasia and North America, respectively).
Table 3.
ANOVA table of the effects of sources of variation on plant height (cm) of Lythrum salicaria, as measured by volunteers as part of a worldwide program.
Table 4.
ANOVA table of the effect of sources of variation on individual heterozygosity of Lythrum salicaria in Eurasia versus North America.
Fig 5.
Individual heterozygosity for Lythrum salicaria individuals germinated from seeds collected along latitudinal gradients in Eurasia and North America (filled black circle/line vs. gray circle/line, respectively).
Lines were fitted incorporating linear, second order polynomial and log linear equation components in PROC GLMSelect. Interpolated lines follow predicted values for Eurasia and North America (“*” vs. “*”, respectively).
Fig 6.
Genetic similarity of Lythrum salicaria individuals germinated from seeds collected along two latitudinal gradients in Eurasia and North America as determined using the program STRUCTURE: (a) a plot of the range of possible genetically distinct L. salicaria clusters, K, against ΔK, a model choice criterion for selection of the most likely K; (b); probabilistic assignment of Lythrum salicaria samples from populations along two latitudinal gradients to one of two genetically distinct clusters (white vs. black bars); (c) sub-comparisons for Eurasian populations (K = 3) and (d) North American populations (K = 2).