Annual Report ( 2004 )
Annual Report ( 2004 )
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年报（2004）
DOI：
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发表时间：
2007
期刊：
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通讯作者：
Eunsuk Kim
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作者：
Eunsuk Kim
多种二年生植物的生殖寿命存在自然变异。然而，对自然条件下植物生殖寿命的适应性研究较少。生命史理论认为，单一性是生殖成本的一种极端情况，单一性的进化是最大生殖产出的自然选择的副产品。然而，植物结构的模块化观点、比较研究和先前对动物物种的遗传研究提出了一个不同的假设：生殖寿命可能受到生殖努力、成熟时的大小、幼体生长速度和成年存活率的影响。为了检验自然选择是否以及如何在二年生植物物种中倾向于单核植物，我对8个丹青（Erysimum capitatum）自然种群进行了人口统计调查，其中包括位于Boulder市Shanahan Ridge South Shanahan trail的一个种群。该物种在形态和生活史上呈现出沿海拔梯度的自然变化。
Natural variation of reproductive lifespan has been reported in diverse biennial plant species. However, few studies in plants have investigated the adaptive significance of reproductive lifespan under natural conditions. Life history theory hypothesizes that monocarpy is an extreme case of reproductive cost, and the evolution of monocarpy is a byproduct of natural selection for maximal reproductive output. However, the modular viewpoint of plant structure, comparative studies, and previous genetic studies in animal species suggest a different hypothesis: reproductive lifespan might be influenced by reproductive effort as well as size at maturation, juvenile growth rates, and adult survival. In order to test whether and how natural selection favors monocarpy in biennial plant species, I conducted a demographic survey in 8 Erysimum capitatum natural populations inclwding a population in South Shanahan trail of Shanahan Ridge, City of Boulder. This species shows natural variation in morphology and life histories along an altitudinal gradient.