Abstract
Man’s influence on plant populations is often discussed in terms of habitat destruction (leading to species extinction, greater stress, habitat subdivision), pollution (greater stress, novel environments), increased dispersal (resulting in greater intermixing of gene pools, plant hybridization and even origin of new taxa), and in relation to the species replacements in agriculture and forestry. All of these changes in ecosystems involve evolutionary processes; population genetics and ecology provide tools for studying these processes (both short and long term) and possibly for making some predictions about the fate of populations. Plant species invading or living in temporary habitats of roadsides, fields, sites of secondary succession, etc., are often treated collectively as colonizers, weeds, fugitives, or r-strategists. Literature on their population ecology provides a wealth of information on the life history components of survivorship and reproduction (e.g., see Harper 1977). For example, several recent discussions of secondary succession (Noble and Slatyer 1980; Peet and Christiansen 1980) have emphasized the need for understanding the population dynamics of species in terms of their dispersal, longevity of seed banks, and the life history characteristics of growth, reproduction and competitive success (see Bazzaz’s paper in this symposium). Likewise, population genetic studies of variation, natural selection, migration, random drift and overall comparisons of the adaptive versatility of open versus closed recombination systems, have often involved colonizing annuals (viz. members of Avena, Trifolium, Poa, Bromus, and Xanthium).
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Jain, S. (1983). Genetic Characteristics of Populations. In: Mooney, H.A., Godron, M. (eds) Disturbance and Ecosystems. Ecological Studies, vol 44. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69137-9_16
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