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<p>Moroccan populations of <i>Alnus glutinosa</i> represent a climatic relic. These populations are isolated and threatened by both climate change and human activities. Using leaves from twelve populations of <i>A.</i>&#xa0;<i>glutinosa</i>, this study reveals intraspecific variation in leaf traits and explores how these traits respond to climatic, geographical and hydrological factors. Descriptive statistical analysis and nested analysis of variance revealed significant differences in 22 leaf traits of <i>A.</i>&#xa0;<i>glutinosa</i>, both among and within populations, with a broad range of coefficients of variance (10% to 52.8%), and the majority of leaf phenotypic variation was observed within individual trees. Principal component analysis revealed that the cumulative contribution of the top three principal components largely explained the phenotypic variation of <i>A.</i>&#xa0;<i>glutinosa</i> leaves (74.85%). Linear mixed- effect models indicated a slight effect of climatic factors and a significant effect of hydrological factors on leaf traits. Linear mixed-effect models revealed that the leaf traits of <i>A.</i>&#xa0;<i>glutinosa</i> are mainly affected by channel width, distance to the channel edge, and height above the water level. In addition, a strong relationship between leaf shape traits and elevation was observed, with leaves becoming narrower with increasing elevation. These results contribute to a better understanding of the leaf morphological traits of <i>A.</i>&#xa0;<i>glutinosa</i> and the extent to which the environment influences leaf trait variation. They may provide a scientific basis for the conservation of <i>A.</i>&#xa0;<i>glutinosa.</i></p>

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Intraspecific variability in leaf traits of Alnus glutinosa populations at the southern range limit

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Abdelouahab Sahli,
  • Hassan Ennouni,
  • Soufian Chakkour,
  • Khalil Kadaoui,
  • Mhammad Houssni,
  • Mohammed Ater

摘要

Moroccan populations of Alnus glutinosa represent a climatic relic. These populations are isolated and threatened by both climate change and human activities. Using leaves from twelve populations of A. glutinosa, this study reveals intraspecific variation in leaf traits and explores how these traits respond to climatic, geographical and hydrological factors. Descriptive statistical analysis and nested analysis of variance revealed significant differences in 22 leaf traits of A. glutinosa, both among and within populations, with a broad range of coefficients of variance (10% to 52.8%), and the majority of leaf phenotypic variation was observed within individual trees. Principal component analysis revealed that the cumulative contribution of the top three principal components largely explained the phenotypic variation of A. glutinosa leaves (74.85%). Linear mixed- effect models indicated a slight effect of climatic factors and a significant effect of hydrological factors on leaf traits. Linear mixed-effect models revealed that the leaf traits of A. glutinosa are mainly affected by channel width, distance to the channel edge, and height above the water level. In addition, a strong relationship between leaf shape traits and elevation was observed, with leaves becoming narrower with increasing elevation. These results contribute to a better understanding of the leaf morphological traits of A. glutinosa and the extent to which the environment influences leaf trait variation. They may provide a scientific basis for the conservation of A. glutinosa.