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<p>Non-native organisms challenge ecosystems, especially under the additional influence of climate change. Comparisons of physiological performance between ecologically-similar native and non-native species contribute to the field of invasion biology. We examined two decapod crustaceans that occur sympatrically in the Estuarine Complex of Paranaguá (ECP), Brazil: <i>Charybdis helleri</i> (non-native) and <i>Menippe nodifrons</i> (native). Crabs were acclimated to control (26&#xa0;°C) and elevated (30&#xa0;°C) temperatures for one week in full-strength seawater (35‰), and were then submitted to dilute seawater (30, 25, and 20‰) for 6&#xa0;h, simulating short-term tidal challenges. Hemolymph was assayed for osmolality, chloride, magnesium, and lactate; muscle samples were evaluated for hydration levels. Dissolved oxygen and ammonia production were assessed in the experimental water. Both species were impacted by low salinity, with a synergistic effect from elevated temperatures. However, <i>C. hellerii</i> was more affected by the combined treatments, displaying less capacity to keep stable muscle hydration levels upon seawater dilution, a steeper decrease in dissolved oxygen, higher ammonia excretion, and higher lactate. The non-native <i>C. hellerii</i> was physiologically challenged to a much higher degree than the native species. Although <i>C. hellerii</i> has established populations in the ECP, its sensitivity to salinity reductions and rising temperatures may limit its further spread in areas with intense fluctuating abiotic conditions. These data can support modelling efforts of the trends in species distribution where <i>C. helleri</i> is invasive. This unexpected result may also be indicative of the ongoing process of invasion; similar approaches could contribute to invasion science involving other marine/estuarine invertebrates.</p>

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Marine brachyuran crabs’ osmoregulatory and metabolic responses upon warming and seawater dilution challenges: the non-native Charybdis helleri is more sensitive than the native Menippe nodifrons

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Leonardo P. Rios,
  • Carolina A. Freire

摘要

Non-native organisms challenge ecosystems, especially under the additional influence of climate change. Comparisons of physiological performance between ecologically-similar native and non-native species contribute to the field of invasion biology. We examined two decapod crustaceans that occur sympatrically in the Estuarine Complex of Paranaguá (ECP), Brazil: Charybdis helleri (non-native) and Menippe nodifrons (native). Crabs were acclimated to control (26 °C) and elevated (30 °C) temperatures for one week in full-strength seawater (35‰), and were then submitted to dilute seawater (30, 25, and 20‰) for 6 h, simulating short-term tidal challenges. Hemolymph was assayed for osmolality, chloride, magnesium, and lactate; muscle samples were evaluated for hydration levels. Dissolved oxygen and ammonia production were assessed in the experimental water. Both species were impacted by low salinity, with a synergistic effect from elevated temperatures. However, C. hellerii was more affected by the combined treatments, displaying less capacity to keep stable muscle hydration levels upon seawater dilution, a steeper decrease in dissolved oxygen, higher ammonia excretion, and higher lactate. The non-native C. hellerii was physiologically challenged to a much higher degree than the native species. Although C. hellerii has established populations in the ECP, its sensitivity to salinity reductions and rising temperatures may limit its further spread in areas with intense fluctuating abiotic conditions. These data can support modelling efforts of the trends in species distribution where C. helleri is invasive. This unexpected result may also be indicative of the ongoing process of invasion; similar approaches could contribute to invasion science involving other marine/estuarine invertebrates.