Behaviour 2019
How Does the Context of Dispersal Influence Its Success in Male Vervet Monkeys (Chlorocebus pygerythrus)?
Simon L'Allier1, Megan A. Schwegel1, Colin A. Chapman2, Valérie A.M. Schoof1. 1York University, Toronto, Ontario, Canada; 2George Washington University, Washington, D.C., Washington, United States

Individuals transfer from one social group to another to avoid inbreeding and increase reproductive success. Dispersal also carries social and ecological costs, such as loss of allies, kin support, increased conspecific aggression, and risk of predation and starvation. Dispersal strategies, such as transferring alone or in parallel (i.e., simultaneously with a peer, or sequentially into a group with known individuals) and the timing of movement, have different outcomes for different individuals.  We use long-term demographic and behavioral data to examine the context of 36 dispersal events from 28 male vervet monkeys at Lake Nabugabo, Uganda between 2012 and 2019. Lone dispersals represented approximately 53% (19/36) of events, while 47% (17/36) were parallel dispersals. Using circular statistics, we discovered that while dispersals occur throughout the year, confirmed events were seasonal (May, r= 0.428, µ=148.6ş) and correspond with the conception season (June, r= 0.507, µ=157.1ş). We also explore the impacts of ecological (e.g., seasonality), social (e.g., social stability), and individual (e.g., stress levels) factors during male dispersal on dominance rank.