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Plant population biology and systematics
Author(s) -
Schaal Barbara A.,
Leverich Wesley J.
Publication year - 2001
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1223701
Subject(s) - biology , phylogenetic tree , evolutionary biology , systematics , population , taxon , phylogenetics , reticulate evolution , locus (genetics) , population genetics , ecology , taxonomy (biology) , genetics , gene , demography , sociology
Summary Schaal, B. A. & Leverich, W. J.: Plant population biology and systematics. ‐ Taxon 50: 679–695. 2001. ‐ ISSN 0040‐0262. Traditionally population genetics and systematics have been separate fields, with distinct conceptual frameworks, tools, and statistics. Hennig drew a clear distinction between the reticulate genealogical relationships among individuals and populations on one hand, and the hierarchical phylogenetic relationships among divergent species or taxa on the other. For many plant species, such distinctions blur. The genetic structuring of plant populations is strongly affected by phylogenetic history, and the phylogenetic relationships among species are frequently confounded by gene migration between species. The identification of molecular markers that vary within species, as well as reductions in costs and time associated with DNA sequencing, have set the stage for a blending of the two fields. Haplotype variation at a non‐recombining locus can be historically ordered to produce a gene genealogy. Genealogical analysis coupled with the theoretical framework of coalescence theory can be used to estimate the roles of migration, founder effects and range expansion during the formation and subsequent establishment of species. Such studies hold great promise for understanding the interplay of phylogenetic history and population level process in shaping distinct evolutionary lineages.