. Author manuscript; available in PMC: 2009 Feb 18.

Published in final edited form as: Brain Behav Evol. 2008 Jun 17;72(1):16–26. doi: 10.1159/000139458

Table 1.

Correlations between environmental variables and proportion of males singing. Columns are the: species and environmental variable, the logistic regression parameter estimate (slope), the chi-square value and the P-value relative to a chi-square distribution with 1 df

Species variable	Parameter Estimate	χ² Value	p
T. chloromera (mid-day chorus)
Light	0.0196	0.34	0.5586
ΔLight	0.6606	138.00	<0.0001
Temp	-0.0110	0.18	0.6741
ΔTemp	0.2111	20.19	<0.0001
T. pruinosa (dusk chorus)
Light	-1.3307	121.04	<0.0001
ΔLight	0.5360	15.22	<0.0001
Temp	0.0534	0.69	0.4060
ΔTemp	0.0858	0.95	0.3302