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首页> 外文期刊>Estuarine Coastal and Shelf Science >Strong seasonal effect of moderate experimental warming on plankton respiration in a temperate estuarine plankton community
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Strong seasonal effect of moderate experimental warming on plankton respiration in a temperate estuarine plankton community

机译：温带河口浮游生物群落适度实验升温对浮游生物呼吸的强烈季节性影响

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Climate change projections forecast a 1.1-6.4 ℃ global increase in surface water temperature and a 3 ℃ increase for the Baltic Sea. This study examined the short-term interactive effects of a realistic future temperature increase (3 ℃) on pelagic respiration and bacterioplankton growth and phytoplankton photosynthesis in situ. This study was undertaken throughout a full seasonal cycle in the northern Baltic Sea. We found marked positive short-term effects of temperature on plankton respiration but no significant effect on bacterioplankton growth or phytoplankton photosynthesis. Absolute respiration rates remained similar to other comparable environments at the in situ temperature. With the 3 ℃ temperature increase, respiration rates in situ increased up to 5-fold during the winter and 2-fold during the summer. A maximum seasonal Q_(10) value of 332 was observed for respiration during the cold winter months (twater ≈ 0 ℃), and summer Q_(10) values were comparatively high (9.1). Q_(10) values exhibited a significant inverse relationship to water temperature during winter. Our results thereby suggest that plankton respiration in this coastal zone is more temperature sensitive than previously reported. In addition, field data indicated that plankton respiration switched from being temperature limited to being limited by dissolved organic carbon (DOC) after the simulated temperature increase. Assuming that our observations are relevant over longer time scales, climate change may worsen hypoxia, increase CO_2 emissions and create a more heterotrophic food web in coastal zones with a high load of riverine DOC.
机译：气候变化预测预测全球地表水温度将上升1.1-6.4℃，波罗的海温度将上升3℃。这项研究检查了现实的未来温度升高（3℃）对中上层呼吸，浮游细菌生长和浮游植物光合作用的短期相互作用的影响。这项研究是在波罗的海北部的整个季节周期中进行的。我们发现温度对浮游生物呼吸具有明显的短期积极影响，但对浮游细菌的生长或浮游植物的光合作用没有显着影响。在原位温度下，绝对呼吸速率仍与其他类似环境相似。随着3℃温度的升高，原位呼吸速率在冬季增加到5倍，在夏季增加到2倍。在寒冷的冬季（twater≈0℃），呼吸的最大季节性Q_（10）值为332，而夏季Q_（10）的值相对较高（9.1）。 Q_（10）值与冬季的水温呈显着反比关系。因此，我们的结果表明，该沿海地区的浮游生物呼吸比以前报道的对温度更敏感。此外，现场数据表明，在模拟温度升高后，浮游生物的呼吸作用已从温度限制变为溶解有机碳（DOC）限制。假设我们的观察在更长的时间范围内具有相关性，那么气候变化可能会使缺氧加剧，CO_2排放增加，并在河流DOC含量高的沿海地区形成更具异养性的食物网。

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