Areography. Geographical Strategies of Species by Eduardo H. Rapoport

By Eduardo H. Rapoport

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Areography Relation between, the total number of subspecies, and the number of internal (Mediterranean) sub­ species. Data correspond to sixty-three species of North American mammals. The partitioning model B is based on Fig. 7B, always predicting a higher number of internal subspecies than observed. 7B) we use a random fragmentation model such as that of Fig. 2. the number of internal subspecies increases at a higher rate than curve B. The last case shows that there is a tendency to increase the perimeter or the irregularity of the species1 external frontiers when the number of subspecies increases.

Suppose that in a square in which we inscribe the biggest possible circle (Fig. 12a) four free spaces are left — one in each corner — where we can inscribe successively smaller circles. Circles of the same size can be considered as a different subspecies. This is equivalent to the space left by the packing of four circles (Fig. 12b). The main problem is produced by the first or biggest subspecies (A) which, in the model, occupies a larger area than the one observed in nature. If we reduce A to chords (pointed line in Fig.

For example, in Fig. n. n. erythropygia to the north, the latter subdivided into two large stocks (A9B). The distance between A and C is only a little shorter than the one between A and B. In a case like this, common sense makes us discard the ACB option and accept the ABC one as the most probable. 2. The other weakness comes from the greater or lesser laxity in relation to the number of available points. Let us suppose an extreme case, that is, if we have only two reported localities. This can be due to either (a) is the first prospection or census and, consequently, we have no information about what occurs between and around the two points, or (b) it is a species with a disjunct area.

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