Mate finding, Allee effects and selection for sex-biased dispersal.

摘要: Although dispersal requires context-dependent decision-making in three distinct stages (emigration, transit, immigration), these decisions are commonly ignored simple models of dispersal. For sexually reproducing organisms, mate availability is an important factor decisions. Difficulty finding mates can lead to Allee effect where population growth decreases at low densities. Surprisingly, theoretical studies on and sex-biased produce opposing predictions: the former, one sex predicted move less if other evolves search more, whereas latter, mate-finding difficulties select for bias when occurs after Here, we develop a pair examine joint evolution settlement behaviour. Our first model resolves apparent contradiction from literatures. second demonstrates that relationship between mating system more complex than contrast resource defence monogamy female polygyny. results highlight key timing relative (before, during, or after). We also show although movement has potential alleviate effect, some cases, it actually exacerbate effect.