Multiple determinants of Australian tropical frog biodiversity
Multiple determinants of Australian tropical frog biodiversity
复制标题
澳大利亚热带蛙生物多样性的多重决定因素
DOI：
10.1016/s0006-3207(99)00093-2
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Hero
中科院分区：
文献类型：
--
作者：
S. Williams;J. Hero
分布数据在22个亚区的澳大利亚湿热带雨林蛙被用来分析组合组成和多样性的地理模式，并将这些模式与环境因素。物种丰富度的生态相关性和群落结构的空间格局表明，物种丰富度的格局可分为三类，每一类都受到不同过程的影响。栖息地通才的物种丰富度在很大程度上不受热带雨林变量，主要与广泛的栖息地多样性和气候。非microhylid雨林蛙物种丰富度的空间格局是与历史地理学相关的过程的结果，特别是在那些受第四纪波动影响最大的亚区的灭绝和随后的灭绝。这组青蛙经历了严重的人口下降，近年来的下降代表了区域生物多样性的显着损失，因为它是这组产生的青蛙多样性的大部分区域变异。相比之下，最显着的影响microhylid物种丰富度的空间格局可能是在原位物种形成的地区一致的降雨量，海拔梯度，隔离和低扩散能力的驱动。这些结果强调，为了了解生物多样性的决定因素，有必要使用有意义的和客观的功能生态学的基础上的群体：它是不够的，纯粹基于物种丰富度的广泛的分类组内检查模式。
Distribution data on rainforest frogs within 22 subregions of the Australian Wet Tropics were used to analyse biogeographic patterns in assemblage composition and diversity, and to relate these patterns to environmental factors. The ecological correlates of species richness and spatial patterns of assemblage structure suggested that the patterns of species richness fell into three categories, each being influenced by different processes. The species richness of habitat generalists was largely unaffected by rainforest variables and was primarily related to broad habitat diversity and climate. The spatial patterns of species richness of non-microhylid rainforest frogs were the result of processes associated with historical biogeography, especially extinctions and subsequent recolonisations in those subregions most affected by Quaternary fluctuations in rainforest area. This group of frogs has undergone severe population declines in recent years and the declines represent a significant loss in regional biodiversity since it is this group that produces the majority of regional variability in frog diversity. In contrast, the most significant influence on spatial patterns of microhylid species richness may have been in situ speciation in areas of consistent rainfall, driven by altitudinal gradients, isolation and low dispersal ability. These results stress the necessity of using meaningful and objective groups based on functional ecology in order to understand the determinants of biodiversity: it is not sufficient to examine patterns based purely on species richness within a broad taxonomic group.