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首页> 外文期刊>Marine ecology progress series >High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina
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High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina

机译：较高的铵可利用率放大了低盐度对鳗草带状疱疹的不利影响

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摘要

Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 mu M) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality increased. Exposure to low salinity was also followed by a decrease in sucrose, suggesting that it was used as an osmolyte and/or that photosynthesis could not cover energy requirements needed for osmoregulation or repairing processes. Concomitant exposure to high NH4+ and low salinity turned the positive effect of NH4+ into a strong, negative synergistic effect. Several growth-related variables were affected significantly and mortality increased substantially. We suggest that this simultaneous exposure intensified competition for energy and C skeletons affecting other metabolic processes (e.g. growth, repair processes) negatively. Our results suggest that climate change driven alterations in precipitation and NH4+ loading might seriously impact estuarine eelgrass communities.
机译：气候变化加剧了降雨事件的频率和强度，从而增加了淡水和养分向沿海地区的排放。这可能会降低盐分并增加养分的利用率，从而影响河口鳗鱼的种群。我们研究了不断增加的NH4 +水平和低盐度对河口鳗草滨海带藻互作的影响，该藻在微观上以NH4 +富集（0、10和25μM）和盐度（5、12.5和20）的各种组合生长。只要盐度保持在环境水平下，增加NH4 +对鳗gra的生产性能就会产生积极影响（20）。氮富集之后，色素增加，光合作用和各种生长变量以及碳含量（蔗糖和淀粉）降低。低盐度对植物适应性有总体负面影响；色素浓度，光合作用和生长减少，而死亡率增加。暴露于低盐度之后，蔗糖也减少，这表明它被用作渗透压剂和/或光合作用不能满足渗透压调节或修复过程所需的能量需求。暴露于高NH4 +和低盐度的情况下，NH4 +的积极作用变成了强烈的负协同作用。几个与生长相关的变量受到显着影响，死亡率大大提高。我们建议，这种同时暴露会加剧对能量和C骨架的竞争，从而对其他代谢过程（例如生长，修复过程）产生负面影响。我们的结果表明，气候变化驱动的降水和NH4 +含量变化可能会严重影响河口鳗草群落。

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