The long sperm advantage was evident even when the short sperm males mated with the females first, and were effectively given a «head start». (sciencedaily.com)
In this model, an early decline in female fertility was driven by a shift in male mating preference. (journals.plos.org)
Female choice for good quality males is familiar to everyone, whereas much less is known about the evolution of male mate choice. (sciencedaily.com)