Scholarlink

<p>Estuarine fishes regularly experience fluctuations in water temperature and salinity, and many species exhibit broad tolerances that allow them to withstand extreme conditions without mortality. However, a full understanding of physiological capacities that permit occupancy of such changeable habitats also requires insight into how organismal performance responds to environmental variation. In this study, we evaluated fast-start escape performance of sheepshead minnow (<i>Cyprinodon variegatus</i>), a noted eurythermal and euryhaline estuary-resident, across temperatures near the warm extreme of its thermal range (24, 30, 36&#xa0;°C) and salinities varying from low to hypersaline (2, 32, 52 ppt). Fast-start speeds were directly related to the temperature at which fish were tested, but they also exhibited dependence on acclimation conditions. Angular velocity of the initial C-bend was faster at higher test temperatures, but at any given temperature, rotation was fastest in fish held at lower temperatures and at intermediate or high salinities. While temperature and salinity effects were detectable, they were modest in magnitude. These results suggest that sheepshead minnow fast-start performance is relatively robust to environmental variability but can be influenced by fluctuating conditions within estuaries. Short-term increases in temperature brought on by daily tidal cycles may lead to elevated fast-start speeds, but long-term exposure to high temperatures (predicted to increase given climate change) or low salinities (resulting from rainwater inundation of marshes) may contribute to a reduction in fast-start performance and potentially increased vulnerability to predators.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fast-start performance and its dependence on temperature and salinity in sheepshead minnow (Cyprinodon variegatus)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月8日

查看全文
  • David C. Collar,
  • Kayla L. Stanley,
  • Jessica S. Thompson

摘要

Estuarine fishes regularly experience fluctuations in water temperature and salinity, and many species exhibit broad tolerances that allow them to withstand extreme conditions without mortality. However, a full understanding of physiological capacities that permit occupancy of such changeable habitats also requires insight into how organismal performance responds to environmental variation. In this study, we evaluated fast-start escape performance of sheepshead minnow (Cyprinodon variegatus), a noted eurythermal and euryhaline estuary-resident, across temperatures near the warm extreme of its thermal range (24, 30, 36 °C) and salinities varying from low to hypersaline (2, 32, 52 ppt). Fast-start speeds were directly related to the temperature at which fish were tested, but they also exhibited dependence on acclimation conditions. Angular velocity of the initial C-bend was faster at higher test temperatures, but at any given temperature, rotation was fastest in fish held at lower temperatures and at intermediate or high salinities. While temperature and salinity effects were detectable, they were modest in magnitude. These results suggest that sheepshead minnow fast-start performance is relatively robust to environmental variability but can be influenced by fluctuating conditions within estuaries. Short-term increases in temperature brought on by daily tidal cycles may lead to elevated fast-start speeds, but long-term exposure to high temperatures (predicted to increase given climate change) or low salinities (resulting from rainwater inundation of marshes) may contribute to a reduction in fast-start performance and potentially increased vulnerability to predators.