Elevational patterns of the percentages of plant genera with tropical and temperate affinities in Nepal.

Yunyun Lai,Jianmeng Feng

doi:10.7717/peerj.6116

Abstract

BackgroundGeographical patterns of species diversity are one of the key topics in biogeography and ecology. The effects of biogeographical affinities on the elevational patterns of species diversity have attracted much attention recently, but the factors driving elevational patterns of the percentages of plants with tropical and temperate biogeographical affinities have not been adequately explored.MethodsWe first used univariate least squares regressions to evaluate the effects of each predictor on the elevational patterns of the percentages of plant genera with tropical and temperate affinities in Nepal. Then, the lowest corrected Akaike information criterion value was used to find the best-fit models for all possible combinations of the aforementioned predictors. We also conducted partial regression analysis to investigate the relative influences of each predictor in the best-fit model of the percentages of plant genera with tropical and temperate affinities.ResultsWith the increase of elevation, the percentage of plant genera with tropical affinity significantly decreased, while that of plant genera with temperate affinity increased. The strongest predictor of the percentages of plant genera with tropical affinity in the examined area was the minimum temperature of the coldest month. For the elevational patterns of the percentages of plant genera with temperate affinity, the strongest predictor was the maximum temperature of the warmest month. Compared with mid-domain effects (MDE), climatic factors explained much more of the elevational variation of the percentages of plant genera with tropical and temperate affinities.DiscussionThe elevational patterns of the percentages of plant genera with tropical affinities and the factors driving them supported the revision of the freezing-tolerance hypothesis. That is, freezing may filter out plant genera with tropical affinity, resulting in the decrease of their percentages, with winter coldness playing a predominant role. Winter coldness may not only exert filtering effects on plant genera with tropical affinity, but may also regulate the interactions between plant genera with tropical and temperate affinities. The elevational patterns of tropical and temperate plant diversities, and those of their percentages, might be controlled by different factors or mechanisms. Freezing-tolerance and the interactions between plant genera with tropical and temperate affinities regulated by climatic factors played stronger roles than MDE in shaping the elevational patterns of the percentages of plant genera with tropical and temperate affinities in Nepal.

Highlights

To a certain extent, biogeographical affinities of organisms reflect their evolutionary history, eco-physiological traits, and adaptation to environmental factors
We aimed to obtain the relative roles of mid-domain effects (MDE) and climatic factors on the elevational patterns of tropical and temperate plant percentages, and to test the following hypothesis: the elevational patterns shown by the percentages of plant genera with tropical affinity may support the predictions of the revised version of the freezing-tolerance hypothesis
The percentage of plant genera with tropical affinity along the elevational gradient significantly decreased from more than 80% to close to zero, while that of plant genera with temperate affinity increased with the increase of elevation (Fig. 4)

Summary

Introduction

Biogeographical affinities of organisms reflect their evolutionary history, eco-physiological traits, and adaptation to environmental factors. As far as we know, only the effects of biogeographical affinities on the elevational patterns of species diversity have attracted attention Relevant studies on this subject showed that diversity of plants with tropical affinities increased and decreased with the increase of elevation, showing hump-shaped patterns, it peaked at lower elevations than temperate species diversity (Oommen & Shanker, 2005; Wang, Tang & Fang, 2007; Feng et al, 2016). The effects of biogeographical affinities on the elevational patterns of species diversity have attracted much attention recently, but the factors driving elevational patterns of the percentages of plants with tropical and temperate biogeographical affinities have not been adequately explored.

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