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<p>By measuring changes in morphological and neutral genetic markers in a hybrid zone spanning different environments, it is possible to understand different spatial ranges in which natural selection and gene flow are occurring separately. The morphological traits of leaves, acorns and seedling taproots, as well as microsatellite genotypes, were measured in <i>Quercus mongolicoides</i> (QM) and <i>Quercus crispula</i> (QC) in their contact zone along altitude. As altitude increased, there was a shift in all morphological traits and genetic ancestry from QM to QC. Two leaf morphological traits and taproot angle showed drastic changes at an altitude of 950–1,050&#xa0;m. Changes in the leaf and root traits can be interpreted as an adaptation to different environments in an altitudinal gradient. In contrast, the ancestry of QM decreased drastically at an altitude 1,150–1200&#xa0;m, which was higher than the altitude of the changes in morphological traits. This results suggests that QC alleles are excessively introgressed at loci associated with these traits into QM genetic background.</p>

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Discrepancies in interfusion along altitude between morphological and neutral genetic markers observed in a contact zone of two Oaks

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Ichiro Tamaki,
  • Yasuhiro Koyama

摘要

By measuring changes in morphological and neutral genetic markers in a hybrid zone spanning different environments, it is possible to understand different spatial ranges in which natural selection and gene flow are occurring separately. The morphological traits of leaves, acorns and seedling taproots, as well as microsatellite genotypes, were measured in Quercus mongolicoides (QM) and Quercus crispula (QC) in their contact zone along altitude. As altitude increased, there was a shift in all morphological traits and genetic ancestry from QM to QC. Two leaf morphological traits and taproot angle showed drastic changes at an altitude of 950–1,050 m. Changes in the leaf and root traits can be interpreted as an adaptation to different environments in an altitudinal gradient. In contrast, the ancestry of QM decreased drastically at an altitude 1,150–1200 m, which was higher than the altitude of the changes in morphological traits. This results suggests that QC alleles are excessively introgressed at loci associated with these traits into QM genetic background.