Table 1.

Results from paired t-tests investigating the relative response to conspecific and heterospecific intruders. Territory holders of the focal species were presented with tethered intruders of their own species and also of the sympatric congener (see §2c for further details). Comparisons that were significant after sequential Bonferroni correction (Rice 1989) are denoted with an asterisk.

focal species	sympatric congener	site	n	t	d.f.	p
H. americana	H. titia	AR	16	3.6109	15	0.00257*
H. americana	H. titia	CV	33	7.7795	32	<0.0001*
H. americana	H. cruentata	EL	17	0.0241	16	0.98107
H. cruentata	H. occisa	CT	15	0.714	14	0.48696
H. cruentata	H. americana	EL	10	0.8531	9	0.41573
H. occisa	H. titia	OT	16	7.3273	15	<0.0001*
H. occisa	H. titia	PA	26	4.9414	25	0.00004*
H. occisa	H. cruentata	CT	16	0.1437	15	0.88765
H. titia	H. americana	AR	14	5.908	13	0.00005*
H. titia	H. americana	CV	30	8.2647	29	<0.0001*
H. titia	H. occisa	OT	16	6.5646	15	0.00001*
H. titia	H. occisa	PA	19	2.7945	18	0.01198