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Community-wide germination strategies in an alpine meadow on the eastern Qinghai-Tibet plateau: phylogenetic and life-history correlates

机译:青藏高原东部高寒草甸社区范围内的萌发策略:系统发育和生活史相关

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摘要

In this study, we built up a database of 633 species (48 families, 205 genera) from an alpine meadow on the eastern Qinghai-Tibet plateau. Our objective was to assess the effects of phylogenetic and life-history (life form, perenniality, seed size, dispersal strategy and period) background on the community-wide germination strategies. We found that the seeds of shrubs, perennials, and well-dispersed plants, and the smaller seeds germinated more and comparatively earlier. In one-way ANOVAs, phylogenetic groups explained 12% of the variance in GT (mean germination time for all seeds germinated of each species); life-history attributes, such as seed size, dispersal strategy, perenniality and life form explained 10%, 7%, 5%, and 1% respectively, and dispersal period had no significant effect on GT. Multifactorial ANOVAs revealed that the three major factors contributing to differences in GT were phylogenetic relatedness, seed size and dispersal strategy (explained 4%, 5% and 4% of the interspecific variation independently, respectively). Thus, seeds germination strategies were significantly correlated with phylogenetic and life-history relatedness. In addition, phylogenetic relatedness had close associations and interactions with seed size and dispersal strategy. Then, we think phylogeny and life-history attributes could not be considered mutual exclusively. Seed germination, like any other trait, is shaped by the natural history of the species and by the evolutionary history of the lineage. And a large percentage of the variance remained unexplained by our model, which suggested important selective factors or parameters may have been left out of this analysis.
机译:在这项研究中,我们建立了一个来自青藏高原东部高山草甸的633种(48科,205属)的数据库。我们的目标是评估系统发育和生活史(生命形式,多年生,种子大小,扩散策略和时期)背景对社区范围内萌发策略的影响。我们发现灌木,多年生植物和分散良好的植物的种子,较小的种子发芽的时间也相对较早。在单向方差分析中,系统进化组解释了GT中12%的变异(每种物种所有发芽种子的平均发芽时间);种子大小,传播策略,多年生和生命形式等生命历史属性分别解释了10%,7%,5%和1%,并且传播时间对GT没有显着影响。多因素方差分析显示,导致GT差异的三个主要因素是系统发育相关性,种子大小和分散策略(分别解释了种间变异的4%,5%和4%)。因此,种子萌发策略与系统发育和生活史相关性显着相关。此外,系统发育相关性与种子大小和扩散策略也有密切的关联和相互作用。然后,我们认为系统发育和生活史属性不能相互排斥。像其他任何性状一样,种子的萌发是由该物种的自然史和世系的进化史所决定的。我们的模型仍无法解释很大一部分方差,这表明重要的选择因素或参数可能已被排除在本分析之外。

著录项

  • 来源
    《Plant Ecology》 |2008年第1期|87-98|共12页
  • 作者单位

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

    Department of Ecology Lanzhou University South Tianshui Road 222 Lanzhou 730000 P.R. China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dispersal strategy; Germination time; Life form; Perenniality; Phylogeny; Seed size;

    机译:分散策略;发芽时间;生命形式;多年生性;系统发育;种子大小;

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