. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 320 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY permit the existence of various forms of life that would otherwise he impossible. Rainfall: The rainfall patterns of Australia will be seen from the map of average rainfall (Fig. 4). The isohyets take the form of concentric zones of increasing rainfall extending outwards from an arid interior. The transition is particularly well denned in the east where the belts extend from north to south parallel with the coast. In places, tongues of dry country extend through from the in
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 320 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY permit the existence of various forms of life that would otherwise he impossible. Rainfall: The rainfall patterns of Australia will be seen from the map of average rainfall (Fig. 4). The isohyets take the form of concentric zones of increasing rainfall extending outwards from an arid interior. The transition is particularly well denned in the east where the belts extend from north to south parallel with the coast. In places, tongues of dry country extend through from the interior to the coast, breaking up the more fertile country into sectors. VEGETATION H ( Mangrove. Mangrove f7"?"^ Gibber desert | | Desert grassland (spin) 3 Mulga scrub |H 'l'l"l Savannah grassland Grass steppe [=1 Savannah woodland Mallee 15551 Sclerophyll forest [TTT] High moor |H Rain forest Fig. 5. Major vegetation formations of Australia, simplified from Pres- eott (1944) and Wood (1949). For explanatory notes see Table 1. There is a close relationship between the distribution of bird species and that of the major vegetation formations, with gaps in the formations acting as isolating barriers. M = mangroves; P = pseudo-rainforest (riverside). Two main systems operate to produce the Australian rainfall, a winter one that moves up over the southern part of the con- tinent (the "Antarctic System") and a summer one (the "Trop- ical System") that brings monsoonal rains to the north of the. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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