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首页> 外文期刊>ICES Journal of Marine Science >Effects of temperature and hypoxia on respiration, photorespiration, and photosynthesis of seagrass leaves from contrasting temperature regimes
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Effects of temperature and hypoxia on respiration, photorespiration, and photosynthesis of seagrass leaves from contrasting temperature regimes

机译：温度和缺氧对对比度温度制度的呼吸，光呼吸和海草光合作用的影响

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In near-future climate change scenarios, elevated ocean temperatures with higher and more frequent peaks are anticipated than at present. Moreover, increased eutrophication and higher primary and secondary productivity will affect the oxygen levels of shallow-water coastal ecosystems, creating hypoxic conditions that can be experienced regularly, especially in dense vegetated systems. These climate-related events may impose detrimental effects on the primary productivity of seagrass. To evaluate such effects, this study combined gas exchange measurements with pulse amplitude-modulated fluorometry to assess the impact of short-time exposure to a range of water temperatures at ambient and low-oxygen levels on mitochondria] respiration, chlorophyll fluorescence (based on the F-v/F-0 ratio), photosynthetic oxygen evolution, and photorespiration in leaf segments of the temperate seagrass Zostera marina and the tropical seagrass Thalassia hemprichii. We found that mitochondria] respiration in both Z. marina and T. hemprichii increased with higher temperatures up to 40 degrees C and that low O-2 caused significantly reduced respiration rates, particularly in T. hemprichii. Elevated water temperature had a clear negative effect on the F-v/F-0 of both seagrass species, indicating damage or inactivation of the photosynthetic apparatus, even when light is not present. Moreover, damage to the photosynthetic apparatus was observed as an effect of elevated temperature combined with low O-2 during darkness, resulting in subsequent lower photosynthesis in light. Photorespiration was present, but not promoted by increased temperature alone and will thus not further contribute to productivity losses during warmer events (when not carbon limited). This study demonstrates the negative impact of hypoxic stress and elevated temperatures on seagrass productivity, which may influence the overall health of seagrass plants as well as oxygen and carbon fluxes of shallow-water coastal ecosystems in warmer climate scenarios.
机译：在近期的气候变化场景中，预计目前预期高且频繁的峰的高近峰。此外，增加富营养化和更高的初级和二次生产率会影响浅水沿海生态系统的氧气水平，从而产生可能经常经历的缺氧条件，特别是在密集的植被系统中。这些与气候相关的事件可能对海草的初级生产力施加不利影响。为了评估这些效果，该研究将气体交换测量与脉冲幅度调节的荧光测量组合，评估短时间暴露于环境温度和低氧水平的一系列水温的影响]呼吸，叶绿素荧光（基于）温带海草滨海滨海滨海和热带海草叶片叶片叶片的光合氧气进化和光散，以及热带海草丘陵。我们发现线粒体呼吸道在Z.Marina和T. Hemprichii中升高，高达40℃，低O-2引起的呼吸速率显着降低，特别是在T.Hemprichii中。升高的水温对海草物种的F-V / F-0具有明显的负面影响，表明光合仪器的损坏或灭活，即使在不存在光线时也是如此。此外，观察到对光合仪的损坏作为暗度期间与低O-2的温度结合的效果，导致随后的光混合。表现出光素，但不能仅通过增加的温度促进，因此在加热事件中没有进一步有助于生产率损失（不碳限制）。本研究表明，缺氧应力和高温对海草生产率的负面影响，这可能影响海草植物的整体健康以及浅水沿海生态系统中的氧气和碳通量在温暖的气候情景中。

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