Table 3.

The standardized regression coefficients describing patterns of age-specific calling effort (the calling curves) for each treatment estimated using a single regression for each treatment (density and calling rate) combination. The individual parameters allow comparison of the linear (age) and quadratic (age²) estimates between the different treatments, demonstrating a more rapid senescence of calling effort in the high versus the low and variable calling rate treatments.

Density	Calling rate	Linear terms			Quadratic terms
		Estimate	SE	P-value	Estimate	SE	P-value
High	High	7.857	0.700	<0.001	–7.513	0.856	<0.001
	Low	8.063	0.482	<0.001	–6.877	0.536	<0.001
	Variable	6.460	0.555	<0.001	–5.252	0.565	<0.001
Low	High	8.462	0.427	<0.001	–7.517	0.430	<0.001
	Low	6.974	0.471	<0.001	–5.747	0.471	<0.001
	Variable	4.363	0.524	<0.001	–3.202	0.486	<0.001