Abbott Ian
Zoology Department, University of Western Australia, 6009, Nedlands, W.A., Australia.
Oecologia. 1978 Jan;33(2):221-233. doi: 10.1007/BF00344850.
New evidence from the passerine faunas of islands off Southwestern Australia agrees with the hypothesis that the passerine faunas of Australian and New Zealand islands are impoverished because most passerine species are poor colonizers. Dispersal of landbirds onto Carnac Island near Perth was infrequent, and many of those species that arrived were represented by single birds. Comparison of similarly structured island and mainland habitats showed that island habitats still have fewer passerine bird species than mainland habitats. Island bird faunas are more stable over short periods of time than over long periods; this is contrary to island avifaunas in the Northern Hemisphere.The following features typify the avifaunas of Australian islands: immigration of species of land birds occurs infrequently; (natural) extinction is rare; and the degree of saturation of the avifaunas is low. Without more direct evidence, competitive interactions should not be invoked to account for the species poverty of these insular avifaunas.
澳大利亚和新西兰岛屿的雀形目动物群数量稀少，因为大多数雀形目物种的扩散能力较差。陆鸟扩散到珀斯附近的卡纳克岛的情况并不常见，而且许多到达该岛的物种仅由单只鸟类代表。对结构相似的岛屿和大陆栖息地进行比较后发现，岛屿栖息地的雀形目鸟类物种数量仍比大陆栖息地少。岛屿鸟类动物群在短时间内比长时间内更稳定；这与北半球的岛屿鸟类区系情况相反。澳大利亚岛屿的鸟类区系具有以下典型特征：陆鸟物种的迁入很少发生；（自然）灭绝很少见；鸟类区系的饱和程度较低。在没有更多直接证据的情况下，不应援引竞争相互作用来解释这些岛屿鸟类区系物种匮乏的现象。
