Walsby Anthony E, Hayes Paul K, Boje Rolf, Stal Lucas J
School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK.
Institut für Meereskunde an der Universität Kiel, Düsternbrooker Weg 20, D-24105 Kiel 1, Germany.
New Phytol. 1997 Jul;136(3):407-417. doi: 10.1046/j.1469-8137.1997.00754.x.
Observations were made on the vertical distribution of colonies of Aphanizomenon flos-aquae for 9 d at a drift-station east of Bornholm Island in the Baltic Sea. The buoyant colonies were dispersed in the upper layers of the water column during periods of wind-induced mixing but floated up during calm periods. From measurements of the vertical light extinction, surface irradiance and the photosynthesis versus irradiance curve, calculations were made of the changes in the daily integral of photosynthesis with respect to time and depth throughout the water column. From these calculations it is demonstrated that net photosynthesis by the population of Aphanizomenon flos-aquae increased nearly threefold by floating up after a deep mixing event. It is estimated that, averaged over alternating periods of calm and mixing, the buoyancy provided by gas vesicles in this organism will result in a nearly twofold increase in photosynthesis. A quantitative analysis has been made of the relationship of the daily integral of photosynthesis by the Aphanizomenon population with the mean depth of the population in the water column and the daily insolation. The analysis shows that the integral decreases linearly with respect to mean depth.
在波罗的海博恩霍尔姆岛以东的一个漂流站，对水华束丝藻的垂直分布进行了为期9天的观测。在风力引起的水体混合期间，漂浮的藻群体分散在水柱的上层，但在平静时期则漂浮到水面。通过测量垂直光衰减、表面辐照度以及光合作用与辐照度曲线，计算了整个水柱中光合作用日积分随时间和深度的变化。从这些计算结果可以看出，在一次深度混合事件后，水华束丝藻群体通过上浮，其净光合作用增加了近三倍。据估计，在平静期和混合期交替的情况下，该生物体中气泡提供的浮力将使光合作用增加近两倍。对水华束丝藻群体光合作用日积分与该群体在水柱中的平均深度以及日日照量之间的关系进行了定量分析。分析表明，该积分随平均深度呈线性下降。
