11月22日,，國際權(quán)威植物學(xué)期刊《新植物學(xué)家》（New Phytologist）在線刊出了武漢植物園在物種多樣性與遺傳多樣性關(guān)系研究領(lǐng)域的最新成果（Contrasting relationships between species diversity and genetic diversity in natural and disturbed forest tree communities）。
武漢植物園植被生態(tài)學(xué)科組助理研究員魏新增在江明喜研究員的指導(dǎo)下，運用野外群落調(diào)查和分子標記技術(shù)相結(jié)合的方法，探討了自然和干擾條件下山地植物群落物種多樣性與群落優(yōu)勢種遺傳多樣性的關(guān)系及其形成機制。研究發(fā)現(xiàn)，在自然條件下，相同的海拔梯度格局是物種多樣性與遺傳多樣性正相關(guān)關(guān)系的一種新的形成機制,；同時指出，在干擾條件下,，物種多樣性降低而遺傳多樣性并未發(fā)生顯著變化,，進而破壞了二者的正相關(guān)關(guān)系。
與前人研究相比,，該研究首次以長壽命生物有機體（樹木）作為研究對象,，探討物種多樣性和遺傳多樣性關(guān)系。結(jié)果指出,，對于生命周期較長的生物有機體來說干擾并未使物種多樣性和遺傳多樣性產(chǎn)生相同的變化趨勢,。這一論點顛覆了前人關(guān)于干擾后物種多樣性和遺傳多樣性均降低的觀點。
該研究得到國家自然科學(xué)基金項目資助,。(生物谷 Bioon.com)
doi:10.1111/j.1469-8137.2011.03957.x
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Contrasting relationships between species diversity and genetic diversity in natural and disturbed forest tree communities
Wei, Xinzeng; Jiang, Mingxi
This study aimed to reveal species–genetic diversity correlations (SGDCs) and their underlying mechanisms in natural and disturbed forests.A community survey and molecular analyses were carried out to compare species diversity (SD), the genetic diversity of the dominant tree species Euptelea pleiospermum (GD), the altitudinal patterns of SD and GD, SGDC, genetic differentiation (FST), community divergence (FST-C), effective population size (Ne), and recent migration rate between mountain riparian forests along the Yandu (natural) and Nan (disturbed) rivers.•In natural forests, both SD and GD showed a unimodal altitudinal pattern and GD was positively correlated with SD, whereas a unimodal pattern and positive SGDC were not found in the disturbed forests. SD and FST at the natural sites were higher than those at the disturbed sites. However, there were no significant differences in GD, FST-C, Ne or recent migration rate between the natural and disturbed sites.•A correlation between the patterns of SD and GD along a geographical gradient (e.g. altitude) is an important driver of positive SGDC. The absence of positive SGDC in the disturbed forests may result from reduced SD but unaffected GD, indicating nonparallel changes in SD and GD. This study furthermore cautions against generalizations about changes in SD and GD following disturbance.
