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<p>Latitudinal variation in thermal tolerance and population genetic structure can shape the geographic distributions of marine ectotherms, particularly in regions influenced by strong ocean currents. We investigated geographic variation in thermal tolerance and genetic differentiation in tropical and temperate populations of the toxic crab <i>Atergatis floridus</i> along the Kuroshio Current in Japan. Lower and upper thermal limits for feeding and survival were experimentally determined for crabs from Ishigakijima Island (tropical) and Tateyama Bay (temperate). In addition, population genetic structure and demographic history were assessed using mtDNA COI sequences. The temperate population exhibited significantly lower lethal temperatures than the tropical population, indicating greater tolerance to low temperatures, whereas upper lethal temperatures did not differ between populations. Genetic analyses revealed weak but significant genetic differentiation between populations. Neutrality tests, mismatch distributions, and Bayesian skyline plot analyses indicated historical population expansion during the Pleistocene in both regions. These findings suggest that present-day population differentiation in thermal tolerance and genetic structure may reflect the combined influences of historical climatic fluctuations and subsequent demographic processes. Winter temperature thresholds for feeding likely constrain the northern limit of reproductive populations, and ongoing ocean warming may facilitate further northward range expansion.</p>

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Thermal tolerance and genetic differentiation in tropical and temperate populations of the toxic crab Atergatis floridus (Decapoda: Brachyura: Xanthidae)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • Kenya Furuno,
  • Katsuyuki Hamasaki,
  • Shota Shimizu,
  • Ryuta Yoshida,
  • Tetsuya Sanda,
  • Shigeki Dan

摘要

Latitudinal variation in thermal tolerance and population genetic structure can shape the geographic distributions of marine ectotherms, particularly in regions influenced by strong ocean currents. We investigated geographic variation in thermal tolerance and genetic differentiation in tropical and temperate populations of the toxic crab Atergatis floridus along the Kuroshio Current in Japan. Lower and upper thermal limits for feeding and survival were experimentally determined for crabs from Ishigakijima Island (tropical) and Tateyama Bay (temperate). In addition, population genetic structure and demographic history were assessed using mtDNA COI sequences. The temperate population exhibited significantly lower lethal temperatures than the tropical population, indicating greater tolerance to low temperatures, whereas upper lethal temperatures did not differ between populations. Genetic analyses revealed weak but significant genetic differentiation between populations. Neutrality tests, mismatch distributions, and Bayesian skyline plot analyses indicated historical population expansion during the Pleistocene in both regions. These findings suggest that present-day population differentiation in thermal tolerance and genetic structure may reflect the combined influences of historical climatic fluctuations and subsequent demographic processes. Winter temperature thresholds for feeding likely constrain the northern limit of reproductive populations, and ongoing ocean warming may facilitate further northward range expansion.