Genetic evidence reveals density‐dependent mediated success of alternative mating behaviours in the European bitterling (Rhodeus sericeus)

• DOI: 10.1111/j.1365-294x.2004.02151.x
• Publication Date: 2004-05-07T11:16:41Z
• Authors: M. Reichard; C. Smith; W. C. Jordan
• Keywords: Allee effect

Abstract The reproductive success of alternative mating behaviours may vary within and among populations in relation to environmental factors demographic parameters. We used behavioural genetic data investigate how male density affects territoriality sneaking the European bitterling ( Rhodeus sericeus , Cyprinidae), a freshwater fish that spawns on gills living mussels. Keeping number spawning sites constant, we manipulated densities laboratory mesocosm experiments. showed sneaked fertilizations were common R. they increased significantly with density. Territorial was almost 17 times more successful than at lowest treatment, still 2–3 intermediate densities. However, both conferred same fitness pay‐off highest While territorial males declined density, individual remained constant across Notably, capacity outcompete sneakers by preoviposition sperm loading best predictor success, rather aggression, body size or postoviposition ejaculation.