Nitrogen and phosphorus in Ulva sp. in the Galician Rias Bajas (northwest Spain): Seasonal fluctuations and influence on growth
Nitrogen and phosphorus in Ulva sp. in the Galician Rias Bajas (northwest Spain): Seasonal fluctuations and influence on growth
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发表时间：
1999
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通讯作者：
R. Villares;X. Puente;A. Carballeira
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作者：
R. Villares;X. Puente;A. Carballeira
沿海富营养化问题日益引起人们的关注。加利西亚里亚是对这种现象非常敏感的生态系统。在本文中，我们评估了石莼可能的营养限制，一种绿色的潮汐在组织中的氮（N）和磷（P），以及生长速度的变化，确定了一个完整的季节性周期石莼。收集在里亚斯巴哈斯（西班牙西北部）。这两种营养素在春季和夏季达到最低水平，冬季达到最高水平。低组织P浓度是惊人的。生长速率的变化与营养盐含量的变化有一定的平行性。最显着的相关性之间的增长速度和组织P，逐步多元回归程序建立的方程，表明P可能发挥更重要的作用比N的生产力的限制石莼。在加利西亚里亚斯Bajas。
Coastal eutrophication has given cause for increasing concern. The Galician rias are ecosystems very sensitive to this phenomenon. In the present paper, we evaluate the possible nutrient limitation in Ulva sp., a green-tide alga. Variations in tissue nitrogen (N) and phosphorus (P), as well as growth rate, were determined over a complete seasonal cycle for Ulva sp. collected in the Rias Bajas (northwest Spain). Minimum levels of both nutrients were reached in spring and summer and maximun in winter. The low tissue P concentrations were striking. There was a parallelism between the evolution of the growth rate and nutrient contents. The most significant correlation found between growth rate and tissue P, and the equations established by stepwise multiple regression procedures, suggest that P may play a more important role than N in the limitation of productivity of Ulva sp. in the Galician Rias Bajas.