Table 2. Results of pairwise comparison of parameters of competitive signals in males of Polygraphus proximus, P. nigrielytris and P. subopacus.

Parameter	Species	P. subopacus	P. nigrielytris
Syllable duration (s)	P. proximus	2.6	4.9**
	P. subopacus		2.3
Chirp rate (chirp/s)	P. proximus	3.2*	1.3
	P. subopacus		2.1
Chirp duration (s)	P. proximus	3.6**	3.1*
	P. subopacus		3.6**
Tooth strikes /chirp	P. proximus	6.2**	3.1*
	P. subopacus		3.1*
Intertooth strike interval (s)	P. proximus	3.2*	0.3
	P. subopacus		3.4**

Notes.

Z-values in cells.

^*p < 0.05.

^**p < 0.001 with Bonferroni correction.