Zusammenfassung
We obtain the Brownian net of Sun and Swart (2008) as the scaling limit of
the paths traced out by a system of continuous space and time branching and
coalescing random walks. This demonstrates a certain robustness of the net,
which we have not seen explored elsewhere. The walks themselves arise in a
natural way as the ancestral lineages relating individuals in a sample from a
biological population evolving according to the spatial Lambda-Fleming-Viot
process. Our scaling reveals the effect of spatial structure on the spread of a
selectively advantageous gene through such a population.
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