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The purpose of this research was to test how, why, and when social power influences victims’ revenge seeking, grudge holding, and forgiveness. Based on Keltner, Gruenfeld, and Anderson’s (2003) power approach theory and McCullough, Kurzban, and Tabak’s (2013) theorizing about revenge and forgiveness systems, we tested (a) the associations between victims’ social power and revenge, grudge, and forgiveness; (b) the mediational role of approach/inhibition motivation in explaining why the associations exist; and (c) the moderating role of whether the transgressor apologizes or not in explaining the associations. Five studies (Ns = 279, 181, 154, 131, and 81) that varied in sample (undergraduate, community), research method (nonexperimental, experimental), context (laboratory, online), measures (self-reported, behavioral), and statistical method (regression, ANOVA), supported our predictions and the systematic generalizability of the effects. Applied implications are discussed.

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The variable start and duration of the Grey seal breeding season makes the estimation of total pup production from a single census very difficult. Classifying the count into morphological age classes enables the form and timing of the birth rate curve and estimates of pup mortality rates to be elucidated. A simulation technique is described which enables the duration of each morphological stage to be determined from a series of such classified counts taken over one season. A further statistical technique uses these estimates to calculate the mean timing and duration of the breeding season from a single classified count taken from similar populations in subsequent years. This information allows total pup production to be calculated for any appropriate breeding colony. Some guidance is given as to the optimal timing of that single census which would yield the best estimate of production, although the precise date is not critical to the success of the technique. Results from single census estimates obtained in this way are compared with known production data from more detailed surveys for a number of different colonies.