The body size of an animal influences its survival, fertility, and mating chances. In addition, who is reproducing and with whom determines how a species evolves. Despite the important fact that body size and mating decisions shape the population and the course of evolution, there have been limited methods so far to study how both together affect population growth.
Schindler, S., Neuhaus, P., Gaillard, J., & Coulson, T. (2013). The Influence of Nonrandom Mating on Population Growth The American Naturalist, 182 (1), 28-41 DOI: 10.1086/670753