Ecological Archives A017-034-A3

Fritz Gerhardt and Sharon K. Collinge. 2007. Abiotic constraints eclipse biotic resistance in determining invasibility along experimental vernal pool gradients. Ecological Applications 17:922–933.

Appendix C. Statistical relationships between experimental treatments and characteristics of plant neighborhoods.

TABLE C1. Statistical relationships between experimental treatments (focal species, water depth, and initial neighbor richness and identity) and characteristics of plant neighborhoods in a greenhouse experiment examining abiotic and biotic resistance to plant invasions. See Notes.

	Focal species	Water depth	Initial richness	Neighbor identity
Final richness	0.538	6.230**	164.721***	65.041***
Final density	1.434	1.610	13.190***	22.125***
Final mass	7.789***	31.834***	34.731***	27.777***
Identity	54.121***	2.961	1005.633***	-

Notes: Final richness, density, and mass were analyzed by ANOVA; identity, by likelihood ratio Χ² test. All analyses included 474 samples, except neighbor mass, which included 472 samples. Values are F statistics, except for identity, which are Χ² statistics. Significant relationships are highlighted in bold; significance levels are ** P < 0.01 and *** P < 0.001. A dash (-) indicates that the analysis was not applicable.

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