Table 2. Predictions.

Ranging patterns, use of space and population density	P1	Given the relatively small spatial variation in the gallery forest structure and composition (Placci, 1995;Van der Heide et al, 2012) there will be a relatively even spatial distribution of food If food is more or less evenly distributed in space, the size of the space regularly used by groups will not vary much among groups.
	P2	Given the lower densities found among monogamous species (Lukas and Clutton-Brock, 2013), owl monkey species will be found at relatively low densities across their distribution.
	P3	Given the relatively smaller overlap of ranges in monogamous mammals (Lukas and Clutton-Brock, 2013), the overlap of owl monkey ranges should be relatively small.
Abundance, temporal and spatial distribution of food	P4	Given that some home ranges are larger than others, larger territories will be “poorer” in quality than smaller ones, and therefore all territories will provide similar amounts of food.
	P5	Given the seasonal nature of the area (Placci, 1995; Fernandez-Duque et al. 2002), owl monkey home ranges will be relatively similar in the temporal distribution and abundance of trees providing food sources.
	P6	If the dry season acts as a bottleneck, owl monkeys will occupy areas that provide enough food during the harshest times. It is then predicted that there will be no marked differences among home ranges in fruit load during the dry season.
Group demography and life-history traits	P7	Assuming that the number of infants produced will be intimately related to the nutritional status of females, which will be related to available food, the number of infants produced in different home ranges will not show much variation.
	P8	Assuming that access to food resources will be intimately linked to the health and survival of dependent infants and growing juveniles, there will be no marked differences in infant and juvenile mortality among home ranges.
	P9	If home ranges had similar amounts of resources, group sizes will be similar.
	P10	Assuming that the age when individuals disperse from their natal groups may be partially influenced by competition for resources within the group, there will be no differences among groups in the mean age at dispersal.