FACTORS REGULATING PERIPHYTIC ALGAL BIOMASS
FACTORS REGULATING PERIPHYTIC ALGAL BIOMASS
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DOI：
10.4319/lo.1992.37.2.0322
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发表时间：
1992-03-01
影响因子：
4.5
通讯作者：
HANSSON, LA
中科院分区：
文献类型：
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作者：
HANSSON, LA
为了评估调控围生藻类群落的主要因素，我沿着瑞典和南极湖泊的生产力梯度进行了一项实地研究，范围从极低生产力的融水到高生产力的湖泊。由于南极湖泊缺乏鱼类以及软体动物和昆虫幼虫，该数据集提供了食物网组成的相当大的差异，为评估这些因素在确定周生藻类生物量方面的重要性提供了难得的机会。在调查的可能因素中，水温、底物特性和食物网组成似乎不太重要。相反，与沉积物相关的围生藻类的生物量与湖泊生产力之间存在曲线关系，表明浮游植物引起的营养限制向光限制转变。空间研究包括的其中一个湖泊的滨海地带的时间研究表明，与湖泊之间的变化相比，湖泊内附生植物生物量的时间变化较小。这项时间研究还强化了空间研究的建议，指出营养物质的可用性是决定周围藻类生物量的主要因素。
To assess the principal factors regulating periphytic algal communities, I conducted a field study along a productivity gradient of Swedish and Antarctic lakes ranging from extremely low productivity meltwater to highly productive lakes. Because the Antarctic lakes lack fish, as well as molluscs and insect larvae, the data set provides considerable variation in food web composition, offering a rare opportunity to evaluate the importance of these factors in determining the biomass of periphytic algae. Among the possible factors investigated, water temperature, substrate characteristics, and food web composition seem to be of minor importance. Instead, there was a curvlinear relationship between the biomass of sediment-associated periphytic algae and lake productivity, suggesting a shift from nutrient limitation to light limitation caused by phytoplankton. A temporal study in the littoral zone of one of the lakes included in the spatial study showed that the temporal variation in periphyton biomass within the lake was low compared to the variation between lakes. The temporal study also strengthened suggestions from the spatial study by pointing to nutrient availability as a major factor determining periphytic algal biomass.