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<p>The aim of this study was to distinguish six chromosomal forms of the phenotypically indistinguishable <i>Nannospalax ehrenbergi</i> species from each other by analysing the shape and Centroid Size (CS) of the cranium and mandible using 2D geometric morphometric methods. The investigation was conducted on six chromosomal forms of <i>N. ehrenbergi</i>. The chromosomal forms selected for the study were 2n = 48 (NF = 74, NFa = 70), 2n = 52a (NF = 76, NFa = 72), 2n = 52b (NF = 74, NFa = 70), 2n = 56a (NF = 66, NFa = 62), 2n = 56b (NF = 62, NFa = 58), and 2n = 56c (NF = 72, NFa = 68), and <i>N. munzuri</i> (outgroup) specimens 2n = 58 (NF = 68, NFa = 64) were collected from the South-eastern Anatolia and Eastern Mediterranean regions of Turkey. A total of 63 samples of the cranium and mandible of specimens from 15 localities were analysed by 2D landmark-based geometric morphometric methods. Procrustes ANOVA indicates that all chromosomal forms have different aspects of cranial size (F = 4.34, <i>P</i> = 0.0201) and shape (F = 5.29, <i>P</i> &lt; 0.0001) and mandible shape (F = 3.94, <i>P</i> &lt; 0.0001). The sex of chromosomal forms had a difference only for cranium shape (F = 1.58, <i>P</i> = 0.0039), but there was no size difference for cranium or mandible. Canonical Variance and Discriminant Function Analyses reveal that all chromosomal forms of <i>N. ehrenbergi</i> separated significantly, both cranially and mandibularly. Chromosomal forms of <i>N. ehrenbergi</i> were more discrete in terms of mandibular shape but were closer cranially. The reason why the mandible is more distinctive may be related to the fact that the cranium and mandible partly evolved separately and/or were affected at different levels by ecological factors in the Spalacidae family.</p>

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Geomorphometric Analysis of Intraspecific Variation in Nannospalax Ehrenbergi (Nehring, 1898) (Rodentia: Spalacidae) in Relation to Chromosomal Differentiation

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Alaettin Kaya,
  • Gökhan Yürümez,
  • Yüksel Coşkun

摘要

The aim of this study was to distinguish six chromosomal forms of the phenotypically indistinguishable Nannospalax ehrenbergi species from each other by analysing the shape and Centroid Size (CS) of the cranium and mandible using 2D geometric morphometric methods. The investigation was conducted on six chromosomal forms of N. ehrenbergi. The chromosomal forms selected for the study were 2n = 48 (NF = 74, NFa = 70), 2n = 52a (NF = 76, NFa = 72), 2n = 52b (NF = 74, NFa = 70), 2n = 56a (NF = 66, NFa = 62), 2n = 56b (NF = 62, NFa = 58), and 2n = 56c (NF = 72, NFa = 68), and N. munzuri (outgroup) specimens 2n = 58 (NF = 68, NFa = 64) were collected from the South-eastern Anatolia and Eastern Mediterranean regions of Turkey. A total of 63 samples of the cranium and mandible of specimens from 15 localities were analysed by 2D landmark-based geometric morphometric methods. Procrustes ANOVA indicates that all chromosomal forms have different aspects of cranial size (F = 4.34, P = 0.0201) and shape (F = 5.29, P < 0.0001) and mandible shape (F = 3.94, P < 0.0001). The sex of chromosomal forms had a difference only for cranium shape (F = 1.58, P = 0.0039), but there was no size difference for cranium or mandible. Canonical Variance and Discriminant Function Analyses reveal that all chromosomal forms of N. ehrenbergi separated significantly, both cranially and mandibularly. Chromosomal forms of N. ehrenbergi were more discrete in terms of mandibular shape but were closer cranially. The reason why the mandible is more distinctive may be related to the fact that the cranium and mandible partly evolved separately and/or were affected at different levels by ecological factors in the Spalacidae family.