Data of sperm competition experiments between Lampetra planeri and L. fluviatilis

The following data come from a study on the effects of sperm competition
and cryptic female choice as putative postmating barriers in two lamprey
ecotypes (Lampetra planeri and L. fluviatilis) with a partial reproductive
isolation. We measured sperm traits in both ecotypes and designed sperm
competition experiments to test the occurrence of cryptic female choice.
Sperm competition experiments either at equal semen volume or equal sperm
number were realized to investigate the role of sperm velocity on
fertilization success.