Effects of water flow on growth and energetics of the scleractinian coral Agaricia tenuifolia in Belize
Effects of water flow on growth and energetics of the scleractinian coral Agaricia tenuifolia in Belize
复制标题
水流对伯利兹石珊瑚生长和能量的影响
DOI：
10.1007/s00338-003-0277-6
复制
发表时间：
2003
期刊：
影响因子：
3.5
通讯作者：
B. Agius
中科院分区：
文献类型：
--
作者：
K. Sebens;B. Helmuth;E. Carrington;B. Agius
伯利兹的珊瑚礁上分布着丰富的分枝石珊瑚，其深度、流态和辐照度范围异常广泛。使用专为扁平珊瑚树枝设计的小体积呼吸测量室，在一定范围的辐照度和单向流速 (1–10 cm s–1) 下测量珊瑚树枝的光合作用和呼吸作用。呼吸频率随着流速的增加而显着增加；然而，流量对 α 或 Pmax 没有显着影响，这表明即使在非常低的流量下，这种珊瑚也可以进行最大程度的光合作用。这一结果与已发表的其他珊瑚物种的结果形成鲜明对比，其他珊瑚物种的净光合作用随着流速的增加而显着增加。使用各种珊瑚礁栖息地中的树枝碎片在一定范围的水流速度下测量细叶细叶珊瑚的生长速率。在 1-15 m 的深度范围内，大多数栖息地类型的生长率相当。与 1 m 相比，15 m 处的流量和辐照度分别下降至小于 20% 和小于 50%。仅在 24 米深度和 15 米低流量微生境（凹陷）中观察到生长减少。在冲浪区移植至 1 m 的群体，生长也有所减缓，并且是唯一遭受显着群体死亡率的群体。在 8 米和 15 米深度，扁平珊瑚枝的生长速度不受方向（平行或垂直于水流）或阴影的影响。与其他物种的研究相比，A. tenuifolia 显示出利用更大范围的栖息地和流速的能力，这表明它可能具有特定的适应性，使其能够忍受非常低的流量条件。
The branching scleractinian coral Agaricia tenuifolia is abundant on reefs in Belize, over an exceptionally broad range of depth, flow regime, and irradiance. Photosynthesis and respiration of coral branches were measured over a range of irradiance and unidirectional flow speeds (1–10 cm s–1) using a small-volume respirometry chamber designed for flat coral branches. Respiration rate increased significantly with flow speed; however, there was no significant effect of flow on either α or Pmax, indicating that this coral could thus carry out maximum photosynthesis even at very low flow. This result contrasts with published results for other coral species that experience a significant increase in net photosynthesis with flow speed. Growth rates of A. tenuifolia were measured using branch fragments in a variety of reef habitats, over a range of water flow speeds. Growth rates were comparable over most habitat types, across a depth range of 1–15 m. Compared to 1 m, flow and irradiance at 15 m decreased to less than 20% and less than 50%, respectively. Reduced growth was observed only at 24-m depth, and in low-flow microhabitats (concavities) at 15 m. Transplants to 1 m, in the surf zone, also had reduced growth and were the only group to suffer significant colony mortality. At 8- and 15-m depth, growth rate of flat coral branches was not affected by orientation (parallel or perpendicular to flow) or shading. Compared with studies of other species, A. tenuifolia displays an ability to utilize a greater range of habitats and flow speeds, suggesting that it may have specific adaptations that allow it to tolerate very low flow conditions.