School of Natural and Built Environment, Queen's University Belfast, Queen's University, David Keir Building, Belfast, BT7 1NN, UK.
School of Biological Science, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK.
J Phycol. 2020 Feb;56(1):198-207. doi: 10.1111/jpy.12943. Epub 2019 Nov 27.
The kelp Laminaria digitata growing in the low intertidal region along energetic coastlines are exposed to a range of hydrodynamic environments. Macroalgae in the intertidal zone can experience both waves and currents independently, but it is unknown how they influence growth rate. Relative growth rate of the meristematic region and the entire blade of L. digitata were measured to assess the influence of wave and current motion from three hydrodynamic environments: low current and low wave (LCLW), high current and low wave (HCLW), and high wave and low current (HWLC). Alongside hydrodynamic data, seawater nutrient concentrations and temperature were also collected and analyzed. Results suggest that differences in L. digitata relative growth rates were not attributed to the seawater nutrient concentrations or temperature, but attributed to the hydrodynamic environments. At the high current condition, kelp growth rate of the meristematic region was enhanced by 45% compared to the high wave condition. When including the entire blade growth rate, an average increase of 25% was observed between the high current and high wave condition. Potentially, the division in growth rate observed between the wave and current motion is related to the frequency and magnitude at which the hydrodynamic forces act. These findings highlight the complexity of the hydrodynamic environment and that forces associated with waves and currents may have a significant role on the productivity of kelp.
在能量充沛的海岸沿线的潮间带低区生长的海带（Laminaria digitata），会受到一系列水动力环境的影响。潮间带的大型藻类可以分别独立地经历波浪和海流，但它们如何影响生长速度尚不清楚。为了评估来自三个水动力环境（低流低浪环境、高流低浪环境和高浪低流环境）的波浪和海流运动对海带分生组织区域和整个叶片相对生长率的影响，我们测量了相对生长率。除了水动力数据外，还收集和分析了海水营养盐浓度和温度。结果表明，海带相对生长率的差异不是归因于海水营养盐浓度或温度，而是归因于水动力环境。在高流速条件下，与高波浪条件相比，海带分生组织区域的生长速度提高了 45%。当包括整个叶片的生长率时，在高流速和高波浪条件之间观察到平均增加了 25%。可能，在波浪和海流运动之间观察到的生长速率差异与水动力作用的频率和幅度有关。这些发现强调了水动力环境的复杂性，并且波浪和海流相关的力可能对海带的生产力有重大影响。
