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Temperature and light explain spatial variation in growth and productivity of the kelp Ecklonia radiata

机译：温度和光照说明海带Ecklonia radiata生长和生产力的空间变化

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Understanding the relative importance of environmental variables on growth and productivity of macroalgae is key to understanding how they might be influenced by environmental change. This study evaluates spatial and temporal patterns in growth and productivity of the kelp Ecklonia radiata in Marmion Lagoon (Western Australia) and tested how well these patterns could be explained by temperature, light, water movement and nutrient concentrations. Growth rates (thallus extension and productivity, measured as biomass accumulation and mass-standardised biomass accumulation) varied between seasons, with the highest rates observed during spring, followed by summer. Temperature and light best explained spatial patterns in growth and productivity of E. radiata. Bottom water velocity and nutrient concentrations typically explained less of the variation, but in some cases they were well-correlated with patterns in productivity. Temperature was the best explanatory variable in summer, when higher water temperatures were associated with lower growth and productivity. Light explained patterns in growth and productivity during winter and spring, when light intensities were lower at some sites, especially at deeper offshore sites, than in summer. The repeated associations between temperature or light and patterns in thallus extension and biomass accumulation suggest that these 2 variables are the most important influences on growth and productivity of E. radiata in Marmion Lagoon. This inference is supported by the knowledge that these 2 variables strongly influence rates of photosynthesis. Our findings suggest that a sustained increase in temperature or reduction in light will reduce growth and productivity of E. radiata.
机译：了解环境变量对大型藻类生长和生产力的相对重要性，是了解环境变量可能如何受到环境变化影响的关键。这项研究评估了Marmion泻湖（西澳大利亚州）海带Ecklonia radiata的生长和生产力的时空格局，并测试了这些格局在温度，光照，水分运动和养分浓度方面的解释效果如何。增长率（以生物量积累和质量标准化的生物量积累来衡量的接触扩展和生产力）在不同季节之间变化，春季观察到的增长率最高，其次是夏季。温度和光能最好地解释辐射状大肠杆菌的生长和生产力的空间格局。底部水流速度和营养物浓度通常较少解释这种变化，但在某些情况下，它们与生产率的模式高度相关。在夏季，温度是最好的解释变量，当时较高的水温会降低生长和生产力。光照解释了冬季和春季的生长和生产力模式，当时某些地点（尤其是较深的近海地点）的光照强度低于夏季。温度或光照与节气门扩展模式和生物量积累之间的反复关联表明，这两个变量是对Marmion泻湖中放射线虫生长和生产力的最重要影响。知道这两个变量强烈影响光合作用的速率可以支持这一推论。我们的发现表明，温度的持续升高或光线的减少将降低辐射大肠杆菌的生长和生产力。

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