LONG-TERM PATTERN OF ALTERNATIVE STABLE STATES IN 2 SHALLOW EUTROPHIC LAKES
LONG-TERM PATTERN OF ALTERNATIVE STABLE STATES IN 2 SHALLOW EUTROPHIC LAKES
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DOI：
10.1111/j.1365-2427.1993.tb00796.x
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发表时间：
1993-08-01
影响因子：
2.7
通讯作者：
JOHANSSON, S
中科院分区：
文献类型：
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作者：
BLINDOW, I;ANDERSSON, G;JOHANSSON, S
1. Takern湖和Krankesjon湖是瑞典南部的两个中度富营养化的浅水湖泊，在过去几十年中，它们在具有丰富水下植被的清水状态和具有高浮游植物密度的浑浊状态之间多次转换。1985年至1991年，塔克恩湖处于清澈状态，而克兰克斯洪湖则从浑浊状态转为清澈状态。在这一转变期间，沉水植物覆盖的区域扩大，随后水透明度增加，与植物相关的大型无脊椎动物和食鱼鱼类增加。营养盐浓度、浮游植物生物量和浮游枝角类丰度均呈下降趋势.在这两个湖泊中，水位波动是导致变化的最常见因素，通过光可用性的变化或通过灾难性事件（如干涸或冰运动造成的机械损坏）影响沉水植物。我们的数据提供了进一步的支持，存在两个替代稳定状态的浅水湖泊保持自稳定的反馈机制。
1. Lake Takern and Lake Krankesjon, two moderately eutrophic, shallow lakes in southern Sweden, have during the past few decades shifted several times between a clear-water state with abundant submerged vegetation and a turbid state with high phytoplankton densities.2. Between 1985 and 1991, Lake Takern was in a clear state, whereas Lake Krankesjon shifted from a turbid to a clear state. During this shift, the area covered by submerged macrophytes expanded, followed by an increase in water transparency, plant-associated macroinvertebrates, and piscivorous fish. Nutrient concentrations, phytoplankton biomass and abundance of planktonic cladocerans decreased.3. In both lakes, water level fluctuations were the most common factor causing shifts, affecting submerged macrophytes either through changes in light availability or through catastrophic events such as dry-out or mechanical damage by ice movement.4. Our data give further support for the existence of two alternative stable states in shallow lakes maintained by self-stabilizing feedback mechanisms.