International Scholarly Research Notices

Research Article

Potential Effects of Host Height and Phenology on Adult Susceptibility to Foliar Attack in Tropical Dry Forest Grass

Table 1

Results of generalized linear mixed models applied to test for the effect of tiller height and phenology on the incidence and severity of herbivore and pathogen damage in Lasiacis ruscifolia. Restricted maximum likelihood method was used to separate the variance of fixed effects from that of the random effect, thus no F value and its associated P value and degrees of freedom are calculated for the random effect (see Section 2).


Model term	df	df den	F-ratio	P value	% Error variance	Model (%)

Herbivory incidence						72.2
Height	1	28.74	2.182	.151	—
Phenology	2	32.34	1.647	.208	—
Height × phenology	2	26.89	2.661	.088	—
Plant (random)	—		—	—	51.5
Residual	—		—	—	48.5
Herbivory severity						36.0
Height	1	35.09	1.922	.177	—
Phenology	2	32.41	2.152	.133	—
Height × phenology	2	32.32	2.136	.138	—
Plant (random)	—		—	—	16.1
Residual	—		—	—	83.9
Disease incidence						33.9
Height	1	35.67	3.106	.087	—
Phenology	2	28.07	3.737	.036	—
Height × phenology	2	34.50	0.977	.386	—
Plant (random)	—		—	—	−1.0
Residual	—		—	—	101.0
Disease severity						40.9
Height	1	35.96	4.524	.040	—
Phenology	2	28.40	3.903	.032	—
Height × phenology	2	33.81	0.170	.844	—
Plant (random)	—		—	—	2.5
Residual	—		—	—	97.5