Manuscript title: Plant genetic identity effects of foundation tree species and their hybrids affect a litter-dwelling generalist predator
Electronic Supplemental Material
Todd Wojtowicz, ZacchaeusG. Compson, Louis J Lamit, Thomas G Whitham, and Catherine A Gehring
Corresponding author: Todd Wojtowicz
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Online Resource 1Image of an agelenid sheet web on cottonwood litter in the common garden with mechanical pencil for scale. White arrow points to funnel. Inset (lower right) of enlarged image of juvenile agelenid spider on sheet web (i.e., spider not to scale).
Online Resource 2Total agelenid web abundance across survey months. Only those months that have a solid circle on the line were surveyed (i.e., no surveys were conducted in May or September). Web abundance was pooled over the two distances and Populus cross types.
Online Resource 3 Effects of tree cross type, genotype, and distance (0-100 cm or 100-200 cm from tree base) on litter web density and litter depth using only the genotypes collected from trees within the 13 km hybrid zone (i.e., 20 narrowleaf trees consisting of 6 genotypes were excluded from these analyses). P-values in bold are statistically significant.
Response Variable / Predictor Variables / df / Χ2 or F statistic / PWebs m-2 / Cross Type / 2 / F=4.19 / 0.04
Genotype[Cross Type] / 1 / Χ2=0.24 / 0.63
Distance / 1 / F=36.00 / <0.0001
Cross Type × Distance / 2 / F=2.03 / 0.16
Genotype[Cross Type] × Distance / 1 / Χ2=0.58 / 0.45
Online Resource 4The effect of genotype on mean agelenid web density at (a) 0-100 cm and (b) 100-200 cm from the base of the trees. Fremont cottonwood (black bars), F1 hybrid (dark gray bars), and narrowleaf cottonwood (light gray bars) cross types are represented by their respective leaf icons. Untransformed data are presented for ease of viewing and. Error bars are 1 SE of the mean.
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