By Eduardo H. Rapoport
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Here we have to consider two measurements; the total area calculated for the species and the real area of the polygonal figure covered by the first one. We have to find out what grade of likelihood and error the first figure has with respect to the second one. As we can see, with only two reference points, the error can be very high if we take two extreme cases such as those shown in Fig. 5A. If the operation is repeated several times, on the average the calculated area comes quite close to the real one.
Total no. 979 No. internal subspecies vs. 030a No. internal subspecies vs. 0188 If, instead of using absolute values, correlation is calculated as percentage of internal subspecies vs. 096 which is, however, too low. If the regression line in some way reflects reality, we would have that for a total of sixteen subspecies (an arbitrary number chosen to build Fig. 36, that is ca, 15% and 85% of internal and external subspecies respectively; these values are somewhat different from the ones in Fig.
23 The approximate form of the range of a propagule with growth-rate imposed by the anisotropy of the medium. 1, 2, 3 are the growth-rates in units of length per unit of time, assigned at random to the different parcels. An interesting point that can be tested with the "ruler and compass" model is seeing what happens when half of the areas is erased from one of the figures as Fig. 3. In other words, what happens after a marine ingression, areal glaciation or any other natural agent of massive destruction, that is, when the sea or the glaciers retire leaving a no-man's land?
Areography. Geographical Strategies of Species by Eduardo H. Rapoport