The relationships of allozyme and life history variation in a particularly narrow ecological setting are studied. Levels of genetic variation are compared in five introduced, predominantly selfing weedy species that are undergoing rapid range expansion northward in eastern N. America, mostly in monocultures of soybean and maize. In all of these species, a low level of allozyme variation contrasts sharply with the substantial inter- and intrapopulational variation in morphological and phenological life history features. Evolutionary and historical factors, determining variability of the species examined are reviewed, including founder effects, breeding system, environmental homogeneity, polyploidy, domestication, and crop-weed interactions.
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Warwick, S.I. Allozyme and life history variation in five northwardly colonizing North American weed species. Pl Syst Evol 169, 41–54 (1990). https://doi.org/10.1007/BF00935983
- Abutilon theophrasti
- Datura stramonium
- Panicum miliaceum
- Sorghum halepense
- Setaria faberi
- life history
- Flora of N. America