Hypothesis: The rate and scale of dispersal of freshwater diatom species is a function of their global abundance
Hypothesis: The rate and scale of dispersal of freshwater diatom species is a function of their global abundance
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DOI：
10.1078/1434-4610-00103
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发表时间：
2002-09-01
期刊：
影响因子：
2.5
通讯作者：
Maberly, SC
中科院分区：
文献类型：
--
作者：
Finlay, BJ;Monaghan, EB;Maberly, SC
我们分析了淡水池塘中代表性的现存硅藻物种的地理记录。生态文献中记录的物种越频繁，其明显的全球分布就越大。一种解释是，频繁记录的物种在全球范围内是丰富的，而不经常记录的物种在全球范围内是稀有的。我们提出了一个模型，其中随机扩散是驱动物种大规模分布的主导力量，扩散的速度和规模很大程度上取决于全球种群规模。因此，当地稀有或丰富的物种在世界范围内同样稀有或丰富。据预测，通过额外的采样工作，许多较稀有的硅藻物种将被证明具有广泛的地理分布，但这需要集中研究以揭示通常神秘的物种。支持特有硅藻物种的论点是站不住脚的，因为不可能反驳它们在生物圈其他地方的存在。
We have analysed the geographical records of a representative selection of extant diatom species from a freshwater pond. The more often a species is recorded in the ecological literature, the greater is its apparent global distribution. One explanation is that the frequently recorded species are globally abundant, whereas species that are infrequently recorded are globally rare. We suggest a model in which random dispersal is the dominant force driving large-scale distribution of species, with the rate and scale of dispersal largely determined by global population size. Thus species that are locally rare or abundant are likewise rare or abundant worldwide. It is predicted that many of the rarer diatom species will, with additional sampling effort, be shown to have wide geographical distribution, but this requires intensive studies focused on revealing species that are normally cryptic. The argument in favour of endemic diatom species is untenable, because it is not possible to disprove their existence elsewhere in the biosphere.