Appendix I. Site-by-site analyses of parasitism rate.

Following are details of contingency table analyses for parasitoid attack on each gallmaker for each site/year combination (i.e., for each pair of bars in Figs. 1 - 3). Pis the standard χ2-test probability for a single comparison (herbivores on S. altissima vs. those on S. gigantea for one year at one site). When P < 0.05, then αSBis the sequential Bonferroni-corrected significance criterion to which the P-value should be compared for a test controlling species-wise error rate. Bolded entries have significant attack-rate differences following sequential Bonferroni correction. Analyses for Epiblema are of predissection data.

Gallmaker / Site / Year / Attack rate lower on / χ2(1) / P / αSB
Eurosta
(Fig. 1) / Ascutney, VT / 1993 / S. altissima / 0.5 / 0.50 / ---
Chester, VT / 1993 / S. gigantea / 5.2 / 0.023 / 0.0083
Bellows Falls, VT / 1993 / S. gigantea / 39.7 / <0.0001 / 0.005
Swanton, VT / 2004 / S. altissima / 0.1 / 0.74 / ---
Pellston, MI / 1989 / S. altissima / 24.7 / <0.0001 / 0.0063
Menominee, MI / 1989 / S. gigantea / 50.9 / <0.0001 / 0.0056
Castle Rock, IL / 1989 / S. gigantea / 4.7 / 0.03 / 0.01
Ames, IA / 1989 / S. altissima / 7.8 / 0.0052 / 0.0071
Saint Paul, MN / 1989 / S. gigantea / 0.6 / 0.45 / ---
Saint Paul, MN / 1991 / S. gigantea / 1.6 / 0.21 / ---
Gnorimoschema
(Fig. 2) / Fredericton, NB / 2002 / S. altissima / 2.8 / 0.09 / ---
Fredericton, NB / 2003 / S. altissima / 1.2 / 0.66 / ---
Fredericton, NB / 2004 / S. altissima / 0.2 / 0.63 / ---
Toronto, ON / 2004 / S. gigantea / 0.15 / 0.70 / ---
Jackson, TN / 2001 / S. gigantea / 9.9 / 0.0017 / 0.005
Milaca, MN / 2001 / S. gigantea / 1.6 / 0.21 / ---
Fort Dodge, IA / 2004 / S. altissima / 0.0 / 0.98 / ---
Ames, IA / 2004 / S. altissima / 0.7 / 0.40 / ---
Lone Tree, IA / 2000 / S. altissima / 6.8 / 0.0094 / 0.0063
Lone Tree, IA / 2001 / S. gigantea / 7.4 / 0.0066 / 0.0056
Epiblema
(Fig. 3) / Swanton, VT / 2004 / S. altissima / 0.27 / 0.60 / ---
Toronto, ON / 2003 / S. altissima / 2.1 / 0.15 / ---
Toronto, ON / 2004 / S. altissima / 7.4 / 0.0065 / 0.01
Milaca, MN / 2002 / S. gigantea / 17.9 / <0.0001 / 0.0083
Milaca, MN / 2003 / S. gigantea / 2.8 / 0.10 / ---
Milaca, MN / 2004 / S. altissima / 0.6 / 0.44 / ---