Short- and long-term impacts of variable hypoxia exposures on kelp forest sea urchins
Short- and long-term impacts of variable hypoxia exposures on kelp forest sea urchins
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不同缺氧暴露对海带森林海胆的短期和长期影响
DOI：
10.1038/s41598-020-59483-5
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发表时间：
2020
影响因子：
4.6
通讯作者：
Micheli, Fiorenza
中科院分区：
文献类型：
--
作者：
Low, Natalie H. N.;Micheli, Fiorenza
气候变化正在改变生物体和生态系统所经历的环境压力的强度和可变性，但人们对不断变化的压力机制的影响还没有很好的了解。我们研究了恒定和可变的亚致死缺氧暴露对海胆（Strongylocentrotus purpuratus）多种生物过程的影响，这是加州当前海带森林中的一种关键食草动物，在物理条件下具有很高的变异性。我们定量的代谢率，放牧，生长，钙化，脊柱再生，性腺生产下恒定，3小时可变，6小时可变暴露于亚致死性缺氧，并比较反应，每个缺氧制度，常氧条件。海胆在持续缺氧维持基线代谢率，但有较低的放牧，性腺发育和钙化率比那些在环境条件下。不同的生物过程中的亚致死影响的变量缺氧。在所有低氧处理下，脊柱再生长减少，可变低氧下的钙化率介于常氧和恒定低氧之间，性腺产量与低氧下的连续时间呈负相关。因此，暴露的可变性可以不同地调节亚致死缺氧的影响，并可能通过减少摄食和繁殖影响海胆种群和生态系统。解决现实的、多方面的压力源暴露和多种生物反应对于理解气候变化对物种和生态系统的影响至关重要。
Climate change is altering the intensity and variability of environmental stress that organisms and ecosystems experience, but effects of changing stress regimes are not well understood. We examined impacts of constant and variable sublethal hypoxia exposures on multiple biological processes in the sea urchinStrongylocentrotus purpuratus, a key grazer in California Current kelp forests, which experience high variability in physical conditions. We quantified metabolic rates, grazing, growth, calcification, spine regeneration, and gonad production under constant, 3-hour variable, and 6-hour variable exposures to sublethal hypoxia, and compared responses for each hypoxia regime to normoxic conditions. Sea urchins in constant hypoxia maintained baseline metabolic rates, but had lower grazing, gonad development, and calcification rates than those in ambient conditions. The sublethal impacts of variable hypoxia differed among biological processes. Spine regrowth was reduced under all hypoxia treatments, calcification rates under variable hypoxia were intermediate between normoxia and constant hypoxia, and gonad production correlated negatively with continuous time under hypoxia. Therefore, exposure variability can differentially modulate the impacts of sublethal hypoxia, and may impact sea urchin populations and ecosystems via reduced feeding and reproduction. Addressing realistic, multifaceted stressor exposures and multiple biological responses is crucial for understanding climate change impacts on species and ecosystems.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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