Temperature and light explain spatial variation in growth and productivity of the kelp Ecklonia radiata
Temperature and light explain spatial variation in growth and productivity of the kelp Ecklonia radiata
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DOI：
10.3354/meps10148
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发表时间：
2013-01-01
影响因子：
2.5
通讯作者：
Gunson, Jim R.
中科院分区：
文献类型：
--
作者：
Bearham, Douglas;Vanderklift, Mathew A.;Gunson, Jim R.
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它们如何受到环境变化影响的关键。本研究评估的空间和时间模式的海带Ecklonia辐射在Marmion泻湖（澳大利亚西部）的生长和生产力，并测试如何以及这些模式可以解释温度，光照，水运动和营养浓度。生长速率（叶状体扩展和生产力，生物量积累和质量标准化的生物量积累测量）季节之间变化，最高的速度在春季观察到，其次是夏季。温度和光照最能解释E.辐射状。底层水流速和营养盐浓度通常对这种变化的解释较小，但在某些情况下，它们与生产力模式密切相关。温度是最好的解释变量在夏季，当较高的水温与较低的增长和生产力。光解释模式的增长和生产力在冬季和春季，当光照强度较低，在某些网站，特别是在较深的离岸网站，比在夏季。温度和光照与叶状体延伸和生物量积累模式之间的重复关联表明，这两个变量是影响E. Marmion Lagoon的Radiata这两个变量强烈影响光合作用速率的知识支持这一推论。我们的研究结果表明，温度的持续升高或光照的减少将降低E.辐射状。
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.