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Many species reproduce both sexually and asexually producing geneticallyunique and clonal recruits. The relative contribution of sexual and asexualreproduction is mostly considered a consequence of natural selection, forexample, disfavouring sexual propagules during invasions. Here, we present anovel model for the invasion of species into a new habitat. The model is fullyneutral with respect to the dispersal and the survival of sexual and asexualrecruits. In addition to local dispersal through sexual and asexualreproduction, long-distance dispersal is implemented through a non-zeroprobability for long-range relocations. We parameterized our model usingempirical data on the distribution of asexually and sexually recruitedindividuals of the recently established macroalga Fucus radicans over itscurrent area of distribution, the 8000 year old Baltic Sea. As a solelystochastic alternative mechanism to natural selection, our simulation resultssuggest local abundance of one sex, that during a persistent phase ofestablishment will result in a heterogeneous distribution of sexual and asexualrecruits. Specifically, the model suggests an initial general dominance of oneor a few clones, and this pattern is observed in Fucus radicans as well as inseveral other species with recent colonization histories.

A neutral model can explain geographic patterns of sexual and asexual individuals