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首页> 美国卫生研究院文献>Ecology and Evolution >One-year experiment on the physiological response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to elevated pCO2 and temperature
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One-year experiment on the physiological response of the Mediterranean crustose coralline alga Lithophyllum cabiochae to elevated pCO2 and temperature

机译：一项为期一年的实验研究地中海地壳珊瑚藻小花石楠对pCO2和温度升高的生理反应

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The response of respiration, photosynthesis, and calcification to elevated pCO2 and temperature was investigated in isolation and in combination in the Mediterranean crustose coralline alga Lithophyllum cabiochae. Algae were maintained in aquaria during 1 year at near-ambient conditions of irradiance, at ambient or elevated temperature (+3°C), and at ambient (ca. 400 μatm) or elevated pCO2 (ca. 700 μatm). Respiration, photosynthesis, and net calcification showed a strong seasonal pattern following the seasonal variations of temperature and irradiance, with higher rates in summer than in winter. Respiration was unaffected by pCO2 but showed a general trend of increase at elevated temperature at all seasons, except in summer under elevated pCO2. Conversely, photosynthesis was strongly affected by pCO2 with a decline under elevated pCO2 in summer, autumn, and winter. In particular, photosynthetic efficiency was reduced under elevated pCO2. Net calcification showed different responses depending on the season. In summer, net calcification increased with rising temperature under ambient pCO2 but decreased with rising temperature under elevated pCO2. Surprisingly, the highest rates in summer were found under elevated pCO2 and ambient temperature. In autumn, winter, and spring, net calcification exhibited a positive or no response at elevated temperature but was unaffected by pCO2. The rate of calcification of L. cabiochae was thus maintained or even enhanced under increased pCO2. However, there is likely a trade-off with other physiological processes. For example, photosynthesis declines in response to increased pCO2 under ambient irradiance. The present study reports only on the physiological response of healthy specimens to ocean warming and acidification, however, these environmental changes may affect the vulnerability of coralline algae to other stresses such as pathogens and necroses that can cause major dissolution, which would have critical consequence for the sustainability of coralligenous habitats and the budgets of carbon and calcium carbonate in coastal Mediterranean ecosystems.
机译：在地中海甲壳珊瑚藻类海藻Lithophyllum cabiochae中单独或组合研究了呼吸，光合作用和钙化对pCO2和温度升高的响应。在接近环境的辐照条件下，环境温度或升高的温度（+ 3°C），环境温度（大约400μatm）或pCO2升高（大约700μatm）的情况下，藻类在水族箱中维持1年。随着温度和辐照度的季节性变化，呼吸，光合作用和净钙化表现出强烈的季节性模式，夏季高于冬季。呼吸不受pCO2的影响，但在所有季节都表现出总体升高的趋势，除了夏季在pCO2升高的情况下。相反，光合作用受到pCO2的强烈影响，在夏季，秋季和冬季，pCO2的升高会导致光合作用下降。特别地，在升高的pCO 2下光合作用效率降低。净钙化显示出不同的反应，具体取决于季节。夏季，在环境pCO2下，净钙化随温度升高而增加，而在pCO2升高时，净钙化随温度升高而降低。令人惊讶的是，在较高的pCO2和环境温度下，夏季的最高发病率。在秋季，冬季和春季，净钙化在升高的温度下均显示正响应或无响应，但不受pCO2的影响。因此，在pCO2增加的情况下，L。cabiochae的钙化速率得以维持甚至提高。但是，可能需要与其他生理过程进行权衡。例如，在环境辐照下，光合作用响应于增加的pCO2而下降。本研究仅报道了健康标本对海洋变暖和酸化的生理反应，但是，这些环境变化可能会影响珊瑚藻对其他压力（如病原体和坏死等）的脆弱性，这些压力可能导致主要溶解，这对于地中海沿海生态系统中珊瑚生境的可持续性以及碳和碳酸钙的预算。

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