Patterns of Mammalian Species Richness in the Australian Tropical Rainforests: Are Extinctions during Historical Contractions of the Rainforest the Primary Determinants of Current Regional Patterns in Biodiversity?

作者: S. E. Williams

DOI: 10.1071/WR96040

关键词: Global biodiversityEcologyExtinctionRainforestBiologyGuildHabitatBiodiversitySpecies richnessBody size and species richness

摘要: Distribution data on the mammals of wet tropics have been used to analyse biogeographic patterns in assemblage composition and correlate species richness with environmental factors such as climate vegetation. Multivariate analyses suggest five different geographically separated assemblages rainforest mammals. The most species-rich is found central uplands (Atherton Tableland) a decrease north south decreasing altitude. areas are characterised by large rounder shape (low index), high annual rainfall, consistent rainfall dry season diversity regimes within area. Multiple-regression analysis suggests that combination area explain variance (r2 = 0.74) Various measures habitat also highly dependent area, similar degree 0.78) can be explained using habitat-diversity variables (rainfall vegetation diversity) excluding area. This effect primarily due its positive influence habitat-heterogeneity regression. Analysis guild structure (number guilds each guild) indicates it number strongly affects rainforest, although has an effect. Most attributed three (primarily arboreal) previously shown extinction- prone tropics. These hypothesis current mammalian result localised extinctions those affected Pleistocene contractions rainforest. relative impacts these block indexed shape.

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