Table 1. Modelling shearwater breeding success.

Model	Notation	Estimates	se	Z	p
1	Intercept	0.668	0.147	4.544	<0.001
	R	−0.651	0.090	−7.225	<0.001
	H	0.4182	0.139	2.999	<0.01
	R×H	0.3710	0.098	3.779	<0.001
2	Intercept	0.661	0.147	4.495	<0.001
	R	−0.653	0.090	−7.232	<0.001
	R×H	0.405	0.083	4.886	<0.001

The effect of rat abundance (R), habitat structure (H) and their statistical interaction (R×H) on shearwater breeding success has been modelled through logistic regressions using the breeding output of 101 nests monitored from 1997 to 2007. The nest identity was taken as a random effect to account for multiple entries from the same nest.