1) What could account for the reversal against expectation?
Answer: size of the mainland pool of species, lack of differences in dispersal ability among the mainland species, and competition between species.
2) Why aren’t all species equal in the larger context?
Answer: Some species live in much greater jeopardy of extinction than others. The rare species, the highly specialized species, the less competitive species, and the species having low aptitude for dispersal and colonization, all these species might be missing from a reserve system if the reserves were numerous but small.
3) Why should the number of extinctions be inversely related to reverse size?
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1) The theory of Simberloff and Abele has some problems: two small islands sometimes contain more species than a large one. It might be true in certain circumstance, but it was irrelevant. Because the sheer number of species present on some island or group of islands, or within some wildlife reserve or group of reserves, was not the real issue. The real issue was how an island or a reserve might affect extinction or preservation of particular species in the larger context.
2) The idea of Diamond is an important point for the theory: A refuge system that contained many species like starling and house rat while losing only a few species like ivory – billed woodpecker and timber wolf would be a disaster.
3) A single large reserve would offer greater security within its interior, while several small reserves would suffer proportionately more disturbance along their edges. It might provide a margin of safety against climate change. If one region of the...