Species difference in regional dispersal ability and neutral model

Liu jiajia; Zhou ShuRong

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Species difference in regional dispersal ability and neutral model

Liu jiajia #,Zhou ShuRong *

Laboratory of Arid and Grassland Ecology, School of Life Sciences, Lanzhou University, Lanzhou

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然科学基金,NCET , PCSIRT（No.30670314,,）

Opened online:20 February 2009

Accepted by: none

Citation: Liu jiajia,Zhou ShuRong.Species difference in regional dispersal ability and neutral model[OL]. [20 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29406

The neutral assumption is fundamental yet controversial to neutral theory. In real communities, species may differ in regional dispersal probability not only because of stochasticity such as random sampling process, but also the dispersal ability itself varies considerably across species. In this paper, we relaxed the ecological equivalence assumptions of the neutral model by introducing difference into species’ regional dispersal ability. Adding slight difference in dispersal ability among species into neutral model dramatically reduces species richness and result in considerable deviation of species abundance distributions from those predicted by neutral model. Difference in species immigration ability, if there is, can overwhelm the role of random drift and make local community dynamics becomes deterministic. Species with higher regional dispersal ability tends to have higher relative abundance in local communities. However, species relative abundance distribution curves under species differences in immigration rate can be fitted well by neutral model. More investigations are needed before we understand the relative roles of species differences and neutrality in structuring ecological communities.

Keywords:ecological drift;neutral model;dispersal limitation;species abundance distribution

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