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<p>Increasing water temperatures have a negative impact on freshwater ecosystems. Freshwater mussels (order Unioniformes) are among the most thermally sensitive aquatic species yet lethal thermal tolerance information is only available for 9.6% of North American species. Most studies have been conducted using a static approach to estimate the lethal thermal thresholds, which fail to reflect natural diel (daily) fluctuations observed in rivers. To address this, we evaluate the upper thermal tolerances (LT05 and LT50) for glochidia of <i>Lampsilis satura</i> using both static and diel ramping methods. Glochidia were tested at four static experimental temperatures (30, 33, 36, 39°C) and five diel ramping temperatures (peak temperatures of 30, 33, 36, 39, 42°C) for 24&#xa0;h. Thermal thresholds differed significantly between methods such that LT05 values were 35.57°C (static) and 31.19°C (diel), while LT50 values were 37.02°C (static) and 38.98°C (diel). Notably, LT05 estimates showed an inverse relationship, with lower thresholds under diel exposures and higher thresholds under static exposures. These findings demonstrate that thermal tolerance estimates can vary between static and diel exposures. From a conservation perspective, static trials may offer more conservative benchmarks for management, but diel ramping trials likely better represent real-world thermal conditions.</p>

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Thermal tolerance of a freshwater mussel, Lampsilis satura (sandbank pocketbook), in response to a diel ramping pattern

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Dorothea P. Mildenberger,
  • Xenia L. Rangaswami,
  • Clinton R. Robertson,
  • Roel R. Lopez,
  • Charles R. Randklev

摘要

Increasing water temperatures have a negative impact on freshwater ecosystems. Freshwater mussels (order Unioniformes) are among the most thermally sensitive aquatic species yet lethal thermal tolerance information is only available for 9.6% of North American species. Most studies have been conducted using a static approach to estimate the lethal thermal thresholds, which fail to reflect natural diel (daily) fluctuations observed in rivers. To address this, we evaluate the upper thermal tolerances (LT05 and LT50) for glochidia of Lampsilis satura using both static and diel ramping methods. Glochidia were tested at four static experimental temperatures (30, 33, 36, 39°C) and five diel ramping temperatures (peak temperatures of 30, 33, 36, 39, 42°C) for 24 h. Thermal thresholds differed significantly between methods such that LT05 values were 35.57°C (static) and 31.19°C (diel), while LT50 values were 37.02°C (static) and 38.98°C (diel). Notably, LT05 estimates showed an inverse relationship, with lower thresholds under diel exposures and higher thresholds under static exposures. These findings demonstrate that thermal tolerance estimates can vary between static and diel exposures. From a conservation perspective, static trials may offer more conservative benchmarks for management, but diel ramping trials likely better represent real-world thermal conditions.