Interaction effects of fish, nutrients, mixing and sediments on autotrophic picoplankton and algal composition
Interaction effects of fish, nutrients, mixing and sediments on autotrophic picoplankton and algal composition
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鱼类、营养物、混合和沉积物对自养超微型浮游生物和藻类组成的相互作用影响
DOI：
10.1046/j.1365-2427.1999.00464.x
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发表时间：
1999
影响因子：
2.7
通讯作者：
S. Threlkeld
中科院分区：
文献类型：
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作者：
Kyeongsik Rhew;R. Ochs;S. Threlkeld
1. 我们研究了营养物质、湍流混合、蚊虫、拟革虫和吉拉德以及沉积物对藻类组成、藻类生物量和自养微微型浮游动物(APP)丰度的影响。1995年秋末，我们在24个5立方米的室外中隔系统进行了为期6周的析因设计试验。
2. 湍流混合降低了表面温度，增加了浊度，泥沙的加入也增加了表面温度和浊度。营养物质和混合显著提高藻类总生物量，底泥处理显著降低藻类总生物量。在混养处理中，由于个体效应，藻类生物量的增加幅度大于预期，而鱼的混养处理和混养处理的藻类生物量增加幅度小于预期。
3.未混合高营养处理中隐藻( Cryptomonas(Cryptomonad))水华；高营养高泥沙处理中针茅(Synedra)水华；混合高营养低泥沙处理中丝状丝藻(Ulothrix)水华。
4. 真核APP丰度随底泥添加和湍流混合的增加而增加，并通过混合底泥和混合营养物质的交互作用协同增加。原核生物APP的丰度因营养增强和混合营养交互作用而降低。鱼对APP的丰度没有主要影响，但鱼参与了一些双向相互作用。
5. 的大量显著交互作用表明，APP和其他浮游植物受一系列相互依赖的复杂因素的调控，在浮游植物种群动态和群落组成的研究中应同时考虑这些因素。
1. We examined the effects of nutrients, turbulent mixing, mosquitofish, Gambusia affinis Baird and Girard and sediments on algal composition, algal biomass and autotrophic picoplankton (APP) abundance in a 6-week experiment of factorial design in twenty-four 5-m3 outdoor mesocosms during late autumn 1995.
2. Turbulent mixing decreased surface temperature and increased turbidity, which also was increased by the addition of sediments. Total algal biomass was significantly enhanced by nutrients and mixing, and decreased by the sediment treatment. In the mixing × nutrient treatment, algal biomass increased more than expected from the individual effects, while the fish × mixing and mixing × sediment treatments increased algal biomass less than expected.
3. Cryptomonas (cryptomonad) blooms were observed in the unmixed, high nutrient treatment; Synedra (diatom) blooms were observed in the high nutrient, high sediment treatment; Ulothrix (green algae) blooms were observed in the mixed, high nutrient, low sediment treatment.
4. Eukaryotic APP abundances were increased by sediment addition and by turbulent mixing, and increased synergistically by mixing × sediment and mixing × nutrient interactions. Prokaryotic APP abundances were decreased by nutrient enhancement and by a mixing × nutrient interaction. There were no main effects of fish on APP abundance, but fish were involved in some of the two–way interactions.
5. The large number of significant interaction effects indicates that APP and other phytoplankton are regulated by a complex set of interdependent factors which should be considered simultaneously in studies of phytoplankton population dynamics and community composition.