Table 2

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

Species

χ2 GOF

Pχ

Parameter

Coefficient

SE

z

Pz


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. Pχ = probability value associated with χ2 statistic, SE = standard error of the coefficient estimate, z = test statistic for coefficient, Pz = probability associated with z-statistic. Y-intercepts not shown, but all were significantly less than zero (P < 0.001).

Paradise et al. BMC Ecology 2008 8:22   doi:10.1186/1472-6785-8-22

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