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<p>Invasive species such as <i>Limnoperna fortunei</i> are considered to have broad environmental tolerances and the capacity of adaptation to colonize new environments, which helps these species to spread and increase their abundance. However, like other ectothermic organisms, temperature may strongly affect the physiological performance of <i>L. fortunei</i>, especially when faced with very low or high values, changing respiration and standard metabolic rate (SMR). In order to assess variations in respiration and SMR, as well as to evaluate the effect of extreme temperatures on metabolic oxidation mechanisms, <i>L. fortunei</i> individuals were collected from the Río de la Plata estuary and gradually acclimated to different temperatures (from 2 to 31&#xa0;°C). Our results showed that SMR ranged from 3.64 to 27.2 µmol O<sub>2</sub> g<sub>AFDW</sub><sup>−1</sup> h<sup>− 1</sup>, changing significantly over a wide thermal range. Oxygen consumption appears to be regulated between 13 and 22&#xa0;°C, presumably through behavioral changes (e.g., filtration rate), thermal sensitivity (Q<sub>10</sub>), and oxidative stress enzyme activities. When thermal coefficients and oxidative parameters were measured at extreme temperature values, physiological responses suggest different adaptive mechanisms and antioxidant defenses. Our data support a high potential for colonizing new areas at both lower and higher temperatures than those currently found in its introduced distribution range.</p>

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Effect of extreme temperatures on the physiology of the invasive bivalve Limnoperna fortunei

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Stephanie Beraldo Pissinis,
  • Tatiana Noya Abad,
  • Sebastián E. Sabatini,
  • Erik V. Thuesen,
  • Esteban M. Paolucci

摘要

Invasive species such as Limnoperna fortunei are considered to have broad environmental tolerances and the capacity of adaptation to colonize new environments, which helps these species to spread and increase their abundance. However, like other ectothermic organisms, temperature may strongly affect the physiological performance of L. fortunei, especially when faced with very low or high values, changing respiration and standard metabolic rate (SMR). In order to assess variations in respiration and SMR, as well as to evaluate the effect of extreme temperatures on metabolic oxidation mechanisms, L. fortunei individuals were collected from the Río de la Plata estuary and gradually acclimated to different temperatures (from 2 to 31 °C). Our results showed that SMR ranged from 3.64 to 27.2 µmol O2 gAFDW−1 h− 1, changing significantly over a wide thermal range. Oxygen consumption appears to be regulated between 13 and 22 °C, presumably through behavioral changes (e.g., filtration rate), thermal sensitivity (Q10), and oxidative stress enzyme activities. When thermal coefficients and oxidative parameters were measured at extreme temperature values, physiological responses suggest different adaptive mechanisms and antioxidant defenses. Our data support a high potential for colonizing new areas at both lower and higher temperatures than those currently found in its introduced distribution range.