Local and regional factors influence the structure of treehole metacommunities

BMC Ecology

Table 2 Effects of log-transformed water volume and leaf litter mass on presence-absence of treehole insects

Species	χ ² GOF	P _χ	Parameter	Coefficient	SE	z	P _z
A. triseriatus	382.56	<0.001	Water vol	1.37	0.11	11.92	<0.001
			Leaf mass	0.09	0.25	0.37	0.71
O. signifera	124.62	1.000	Water vol	0.90	0.54	1.69	0.09
			Leaf mass	0.66	0.56	1.19	0.23
T. rutilus	205.38	0.29	Water vol	1.36	0.16	8.56	<0.001
			Leaf mass	-0.69	0.22	-3.22	0.001
C. guttipennis	241.89	0.013	Water vol	0.34	0.08	4.23	<0.001
			Leaf mass	-0.13	0.18	-0.74	0.46
H. pulchella	202.51	0.34	Water vol	0.14	0.08	1.68	0.09
			Leaf mass	0.63	0.18	3.51	<0.001
M. posticata	214.39	0.16	Water vol	0.36	0.13	2.80	0.005
			Leaf mass	0.18	0.24	0.77	0.442
T. albipunctatus	210.24	0.22	Water vol	0.15	0.10	1.56	0.12
			Leaf mass	0.054	0.21	0.26	0.79
Systenus sp.	205.88	0.28	Water vol	-0.07	0.21	-0.34	0.74
			Leaf mass	0.92	0.36	2.56	0.01

Logistic regression results on presence-absence. N = 514 for each species. χ² GOF = chi-square goodness of fit. P_χ= probability value associated with χ² statistic, SE = standard error of the coefficient estimate, z = test statistic for coefficient, P_z = probability associated with z-statistic. Y-intercepts not shown, but all were significantly less than zero (P < 0.001).

ISSN: 1472-6785