Table 1.

Trap effort (number trap nights) and number of dispersing deer mice captured by season at a study site near Cascade, Montana, USA, August 2004–October 2007.

Season	Trap nights	Individual micea	Dispersers	Dispersers/1,000 trap nights
Winter 2004	1,350	69	4	3.0
Winter 2005	4,050	160	12	3.0
Winter 2006	4050	207	35	8.6
Winter 2007	4,050	64	14	3.5
Spring 2005	4,050	127	34	8.4
Spring 2006	4,050	127	23	5.7
Spring 2007	4,050	110	40	9.9
Summer 2004	750	37	5	6.7
Summer 2005	4,050	162	38	9.4
Summer 2006	4,050	179	21	5.2
Summer 2007	4,050	73	8	2.0
Autumn 2004	4,050	119	19	4.7
Autumn 2005	4,050	201	32	7.9
Autumn 2006	4,050	234	38	9.4
Autumn 2007	2,700	166	15	5.6
Total	53,400		338
Average				6.2

^aTotal individuals not reported because some were captured during multiple seasons.