Abstract
1. We analyse 7 years of field data on the mating system of a small population of snakes (adders, Vipera berus) to quantify the relative contribution of factors, such as longevity, fecundity and male mating success rates, to overall lifetime variance in reproductive success. 2. Data were available on 32 males and 40 females that attained reproductive age. Litter sizes were known for females, but our analyses on males relied on mating success rather than number of viable progeny. We thus underestimate the variance in male reproductive success because offspring viability is positively correlated with male lifetime mating success and we do not include variance due to differences among males in the numbers of progeny fathered per mating, or the viability of their offspring
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