Summary
A quantitative method that optimizes the mapping of species diversity in phytogeographic studies is described. Diversity is computed on the basis of species number per unit area. The optimal size of unit area for which diversity is computed is held to be that which maximises the diversity difference between species-rich and species-poor regions. An example is given using Turkish Papaver. A very high correspondence is found between intuitive insights based on long study and the computer-generated diversity maps. Phytogeographic elements were also determined by computer after gridding Turkey at the scale discovered to be optimal for diversity and scoring the grid squares for presence-absence of each species. In this case, too, quite high correspondence was found between the computer and intuitive results.
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References
Cullen, J. 1965. Papaveraceae in Davis (1965).
Cullen, J. 1968. The genus Papaver in cultivation. Baileya 16: 73–90.
Davis, P. H. 1965. Flora of Turkey 1. Edinburgh University Press.
Davis, P. H. 1971. Distribution patterns in Anatolia with particular reference to endemism. Plant Life of S. W. Asia. Botanical Society of Edinburgh.
Fedde, F. 1909. Papaveraceae—Hypecoideae—Papaveroideae. Pflanzenreich 40 (iv. 104): 288–386.
Goldblatt, P. 1974. Biosystematics Studies in Papaver Section Oxytona. Ann. Mo. Bot. Gard. 61: 264–296.
Kosswig, C. 1967. Quoted in Davis 1971 (Aspects of Tethyan Biogeography. Systematics Assoc. Publ. 7: 313–324).
Orlóci, L. 1967. An agglomerative method for the classification of plant communities. J. Ecol. 55: 193–205.
Phipps, J. B. 1971. Dendrogram topology. Syst. Zool. 20: 306–308.
Phipps, J. B. 1975a. Kilometric distance. Can. J. Bot. 53: 1116–1119.
Phipps, J. B. 1975b. Bestblock—optimising grid size in biogeographic studies. Can. J. Bot. 53: 1447–1452.
Popov, M. 1937. Papaveraceae in Komarov, V. (ed.) Flora U.R.S.S. 7: 573–717.
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Nomenclature follows Cullen (1965).
The authors express their thanks to Mr. K. Roberts, University of Western Ontario Computing Centre of writing the original maximum variance program and to the National Research Council of Canada for supporting the computing side of the project.
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Phipps, J.B., Cullen, J. Centres of diversity quantified—A maximum variance approach to a biogeographic problem. Vegetatio 31, 147–159 (1976). https://doi.org/10.1007/BF00114862
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DOI: https://doi.org/10.1007/BF00114862