ISLAND ASSEMBLY THEORY 1091.00.80.60.40.20J1.00.80.60.40.20J1.00.80.60.40.20J0 20 40 60 80 100 120 140
S0 20 40 60 80 100 120 140
S(c)(b)(a)(e)(d)(f)Figure 5.1Incidence functions for birds of the Bismarck Archipelago.Snumber of species on an island, but note that the points represent
grouped data for a narrow range of values of Sfrom between 3 and 13 islands per point, except the two largest values, which each represent a
single island. The index J1.0 if the species occurs on all islands, and 0.0 if the species occurs on none. (a) Centropus violaceus(cuckoo),
a high-Sspecies; (b) Diacaeum eximium(berrypicker), an A-tramp; (c) Pitta erythrogaster(pitta), a B-tramp; (d)Ptilinopus superbus(pigeon), a
C-tramp; (e) Chalcophaps stephani(pigeon) a D-tramp; (f) Macropygia mackinlayi(pigeon), a supertramp. See text for explanation of categories.
(Redrawn from Diamond, J. M. (1975) In Ecology and evolution of communities(ed. M. L. Cody and J. M. Diamond). Copyright © by the President
and Fellows of Harvard College. Reprinted by permission of Harvard University Press.)
concentrated in the smallest, or most remote, and
most species poor islands. An example of this
supertrampcategory is the pigeon Macropygia
mackinlayi. In between, Diamond differentiated
arbitrarily four other categories of lesser tramps, for
those species occurring on some or all of the most
species-rich islands and, depending on the category
of tramp, on other islands of varying size and