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<p>So far, stocks of a few fish species have shown spatial geographic connectivity under different environmental conditions. Here, we analyzed geospatial variations in the sagittal otolith shape and fluctuating asymmetry (FA) within and between males and females of <i>Sarotherodon melanotheron</i> collected at four sampling sites located in southern Benin waters to check whether sagittal otolith shape differs between these four ecological niches having dissimilar abiotic conditions and assess stock structure and fish connectivity within these four niches to inform on managing actions. Results based on Wilk’s λ test showed a significant bilateral asymmetry in left and right sagitta contour shape among males and females within each population, while both Wilk’s λ test and Fisher’s distance matrix revealed a significant bilateral asymmetry in shape among those of four populations, due to FA. In addition, differential significant variances were found in the five shape indices examined among males and females within each population and in all shape indices, except roundness (RO), between those of four populations. Moreover, discriminant function analysis (DFA) revealed no complete separation between males and females of four populations based on sagitta shape differences. Therefore, although there were significant geospatial variations in sagittae shape between individuals of the four ecological niches having different abiotic factors, the stock showed apparent connectivity between these four niches, which can be managed with similar fishery procedures. The potential reasons for this connectivity were attributed to the capability of <i>S</i>. <i>melanotheron</i> individuals to acclimate to differences in abiotic environmental factors between the four niches.</p>

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Does Sarotherodon melanotheron (Perciformes, Cichlidae) Stocks Exhibit Eco-Geospatial Connectivity? Assessment in Benin Waters Using Sagitta Shape Analysis

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Madel F. Adjibayo Houeto,
  • Marius Sounouvou,
  • Kelig Mahé,
  • Abdellah Chalh,
  • Jean-Pierre Quignard,
  • Monia Trabelsi,
  • Abderraouf Ben Faleh,
  • Adel A. Basyouny Shahin,
  • Nawzet Bouriga

摘要

So far, stocks of a few fish species have shown spatial geographic connectivity under different environmental conditions. Here, we analyzed geospatial variations in the sagittal otolith shape and fluctuating asymmetry (FA) within and between males and females of Sarotherodon melanotheron collected at four sampling sites located in southern Benin waters to check whether sagittal otolith shape differs between these four ecological niches having dissimilar abiotic conditions and assess stock structure and fish connectivity within these four niches to inform on managing actions. Results based on Wilk’s λ test showed a significant bilateral asymmetry in left and right sagitta contour shape among males and females within each population, while both Wilk’s λ test and Fisher’s distance matrix revealed a significant bilateral asymmetry in shape among those of four populations, due to FA. In addition, differential significant variances were found in the five shape indices examined among males and females within each population and in all shape indices, except roundness (RO), between those of four populations. Moreover, discriminant function analysis (DFA) revealed no complete separation between males and females of four populations based on sagitta shape differences. Therefore, although there were significant geospatial variations in sagittae shape between individuals of the four ecological niches having different abiotic factors, the stock showed apparent connectivity between these four niches, which can be managed with similar fishery procedures. The potential reasons for this connectivity were attributed to the capability of S. melanotheron individuals to acclimate to differences in abiotic environmental factors between the four niches.