0198566123.pdf

188 ARRIVAL AND CHANGE Body size of mainland population (g) Evolutionary shift from flying passerine to bau plan and ecological ...

provide strong selection pressure towards more agile, smaller forms. Some of the best evidence for nanism seems to be for fossil ...

Chappell Island in the Bass Strait eat an abundant, high-quality resource, which requires little effort to locate, but which is ...

with increasing endemism level of the island focal species. For instance, the Canarian endemic blue chaffinch (Fringilla teydea) ...

have been suggested to explain this relaxation in territoriality: ●Resource hypothesis. This hypothesis suggests that territoria ...

The higher densities of rodent populations indi- cated by the crowding effect are an important part of this analysis. As already ...

Adler and Levins’ (1994) model is based on studies of rodents, but there is no particular reason why it could not be extended to ...

... it is the circumstance, that several of the islands pos- sess their own species of the tortoise, mocking-thrush, finches, an ...

a particular form of the buttercup can be described by the following nomenclature: Kingdom Plantae Division Spermatophyta Order ...

Lepidoptera: butterflies are thought to comprise about 17 500 full species, but the number of cur- rently recognized subspecies ...

Hawaiian islands, over 100 species of Cyrtandraof the widespread family Gesneriaceae (Otte 1989). In general, the greater the ta ...

8.2 The geographical context of speciation events Distributional context In order to appreciate the full gamut of possibilities ...

200 SPECIATION AND THE ISLAND CONDITION Table 8.2A simplified framework for speciation patterning Form Pattern Distributional Sy ...

of making such assumptions (Sauer 1990). The production of island neoendemics of course occurs in isolation from the original co ...

distributional boundaries to be set by biological factors rather than an inability to reach mainland areas. The labelling of par ...

●They become unlike enough to be called different species. ●Often the barrier breaks down and the isolates overlap but do not in ...

smaller islets), with predominantly desert-like con- ditions. Here they have radiated into 13 different species (Sato et al. 199 ...

This idea, of ‘adaptive landscapes’, was originally introduced by Sewall Wright (1932) and has been incorporated into a number o ...

found for continental floras; for islands there was much more scatter in the relationship. Rosenzweig does not distinguish the n ...

8.5 Summary In order to understand evolutionary change it is necessary to have a basic familiarity with the cur- rency of evolut ...