Abstract
Colonizing species are of two kinds: those following a defined habitat, usually a human-disturbed environment (weedy species), and those shifting into a new ecological niche, distinct from the ancestral one. It has been argued (Carson, 1965) that the former do not promote speciation, but that the latter do often speciate through founder effects. According to this view, weedy species, the proper colonizing species, have some recognizable properties: a) they are the result of the fixation of genes for a defined niche, e.g. a unique host or a general adaptability; b) their chromosomal polymorphism is rigid; c) their novel genetic constitution is largely fixed in the homozygous condition, and d) they are resistant to changes by the founder effect, throughout complex, balanced systems of heterosis. On the other hand, true founder populations leading to speciation have a high segregation system, able to shift their internal balance (i.e., their coadapted gene complexes) via the founder effect.
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Fontdevila, A. (1989). Founder Effects in Colonizing Populations: The Case of Drosophila buzzatii . In: Fontdevila, A. (eds) Evolutionary Biology of Transient Unstable Populations. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74525-6_6
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DOI: https://doi.org/10.1007/978-3-642-74525-6_6
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