Department of Biology, Faculty of Marine and Environmental Sciences, University of Cadiz, 11510, Puerto Real, Cadiz, Spain.
Department of Biology, Faculty of Marine and Environmental Sciences, University of Cadiz, 11510, Puerto Real, Cadiz, Spain.
Mar Pollut Bull. 2018 Sep;134:14-26. doi: 10.1016/j.marpolbul.2018.02.029. Epub 2018 Feb 21.
Global (e.g. climate change) and local factors (e.g. nutrient enrichment) act together in nature strongly hammering coastal ecosystems, where seagrasses play a critical ecological role. This experiment explores the combined effects of warming, acidification and ammonium enrichment on the seagrass Cymodocea nodosa under a full factorial mesocosm design. Warming increased plant production but at the expense of reducing carbon reserves. Meanwhile, acidification had not effects on plant production but increased slightly carbon reserves, while a slight stimulation of net production and a slight decrease on carbon reserves under ammonium supply were recorded. When all the factors were combined together improved the production and carbon reserves of Cymodocea nodosa, indicating that acidification improved ammonium assimilation and buffered the enhanced respiration promoted by temperature. Therefore, it could indicate that this temperate species may benefit under the simulated future scenarios, but indirect effects (e.g. herbivory, mechanical stress, etc.) may counteract this balance.
全球（如气候变化）和局部因素（如营养富集）在自然界中共同作用，强烈冲击着沿海生态系统，而海草在其中发挥着关键的生态作用。本实验采用完全析因设计的中观模型，探究了升温、酸化和铵富化对海草鳗草（Cymodocea nodosa）的综合影响。升温增加了植物的生产力，但以减少碳储量为代价。与此同时，酸化对植物的生产力没有影响，但略微增加了碳储量，而在铵供应下，净生产力略有刺激，碳储量略有减少。当所有因素结合在一起时，提高了鳗草的生产力和碳储量，这表明酸化改善了铵同化作用，并缓冲了由温度升高引起的增强呼吸作用。因此，这表明该温带物种可能在模拟的未来情景中受益，但间接影响（如食草作用、机械压力等）可能会抵消这种平衡。
