. Bulletin of the British Museum (Natural History). 128 LORD MEDWAY total present in any combined pair o£ zones have been recorded. In Table 7, Soerensen's coefficient has been calculated for all possible pairs of zones, for both classes. The same results can be presented graphically in the form of dendrograms (Figs i and 2), obtained by nearest-neighbour sorting of the coefficients expressed in Table 7. This presentation inter alia emphasizes the relatively greater distinctiveness of the middle zone (III) among birds, and the greater divergence of highland and lowland faunas among birds compa
. Bulletin of the British Museum (Natural History). 128 LORD MEDWAY total present in any combined pair o£ zones have been recorded. In Table 7, Soerensen's coefficient has been calculated for all possible pairs of zones, for both classes. The same results can be presented graphically in the form of dendrograms (Figs i and 2), obtained by nearest-neighbour sorting of the coefficients expressed in Table 7. This presentation inter alia emphasizes the relatively greater distinctiveness of the middle zone (III) among birds, and the greater divergence of highland and lowland faunas among birds compared with the mammals. These analyses, in terms only of species present, remain crude and far from ideal without reference to variations in the abundance of species at different altitudes. Unfortunately, the means by which distributions were gathered in most cases were too diverse for any reliable quantitative assessment of population densities to be made. The only example of a single technique applied reasonably consistently at all altitudes is mist-netting for birds. Although there are many imponderables, the catches per net/day of any particular species can be taken to indicate broadly its abundance at different altitudes. By this criterion, certain birds were definitely rarer near the limits of their alti- tudinal range than at its centre, as iDustrated by the catches of the three species of Alcippe (Table 2). Although the actual numbers caught are not directly com- parable, Usts from the different netting areas can be made which rank the species. Fig. 2. Dendrogram of Soerensen's coefficient calculated for the mammals of Gunong Benom. Conventions as for Fig. 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 British Museum (Natural History). London : BM(NH)
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