When *P. rapae* colonizes a new continent, what factors primarily filter the initial successful individuals?
Answer
The initial shock of the new climate and the local predator guilds
Because the initial large-scale dispersal of *P. rapae* was aided by human transport across oceans, the primary selective challenges faced by the colonizers were not related to overcoming geographic barriers, which humans bypassed. Instead, the filtering process immediately involved adaptation to the harshness of the new environment itself—specifically, coping with the novel climatic conditions (temperature, photoperiod) and surviving encounters with a completely new assembly of native predators and parasites upon arrival in the introduced range.
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