. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE EVOLUTION OF GUINEA-FOWL 49. Fig. 4. Quantitative characters 22-26, 29-39. A. Lateral view of head, neck and collar of Guttera plumifera. B. Mid-dorsal feather of G. pucherani edouardi. C. Spots on mid-dorsal feathers of Guttera spp. detrimental to the understanding of geographic variation and intra-specific evolution. These critics maintain that: 1. characters used to delineate subspecies usually have patterns of geographic variation which are discordant with each other and with the distribution
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE EVOLUTION OF GUINEA-FOWL 49. Fig. 4. Quantitative characters 22-26, 29-39. A. Lateral view of head, neck and collar of Guttera plumifera. B. Mid-dorsal feather of G. pucherani edouardi. C. Spots on mid-dorsal feathers of Guttera spp. detrimental to the understanding of geographic variation and intra-specific evolution. These critics maintain that: 1. characters used to delineate subspecies usually have patterns of geographic variation which are discordant with each other and with the distribution attributed to the taxon; 2. indistinguishable phenotypes occur in geographically isolated areas, pre- sumably due to parallel evolution under similar selective regimes; 3. no objective degree of difference can be offered to distinguish subspecies from slightly differentiated local populations. In an attempt to satisfy these legitimate criticisms, Ford (1974) offers the taxo-evolutionary subspecies concept, the concept adhered to in the present study. This concept limits the awarding of subspecies status to geographic aggregates of populations which appear to have undergone genetic and pheno- typic divergence in allopatry. Past allopatric divergence may be inferred for. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
