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Food Web Responses to a Cyanobacterial Bloom in a Freshwater Eutrophic Lake
Water ( IF 3.4 ) Pub Date : 2021-05-05 , DOI: 10.3390/w13091296
Mengqi Han , Chenchen Dong , Siqi Ma , Cui Feng , Chengqiang Lei , Zemao Gu , Xiangjiang Liu

The microbial food web is an important part in aquatic ecosystem, but studies on the microbial food web in freshwater ecosystem, especially in freshwater eutrophic lakes, still need further investigation. In the present study, using eutrophic Lake Nanhu as model, the community changes of phytoplankton, zooplankton, and bacteria between the bloom and non-bloom period were analyzed, and microzooplankton grazing experiments were also conducted to measure the grazing pressure and selectivity of microzooplankton on phytoplankton community. Phytoplankton community in Lake Nanhu was mainly dominated by Cyanophyta (49.44%), especially Anabaena circinalis and Microcystis flos-aquae, during bloom period. Rotifers were the main components of zooplankton in Lake Nanhu (44.15%), Brachionus calyciflorus and Moina macrocopa were the most dominant zooplankton in the non-bloom and bloom period, respectively. Bacteroidetes showed significantly higher mean proportion in bloom period than that in non-bloom period (p < 0.001). The growth rates of phytoplankton ranged from −1.00 d−1 to 1.29 d−1, while grazing rates of microzooplankton ranged from −1.15 d−1 to 1.05 d−1. Results indicated that microzooplankton could respond quickly to the increase of phytoplankton during bloom period. Meanwhile, microzooplankton showed grazing preference on Cyanophyta and Cryptophyta during bloom period and non-bloom period, respectively. The microzooplankton grazing selectivity during bloom period might depend on phytoplankton community composition.

中文翻译:

食物网对淡水富营养化湖泊中蓝藻水华的响应

微生物食物网是水生生态系统的重要组成部分,但对淡水生态系统中,特别是在淡水富营养化湖泊中的微生物食物网的研究仍需进一步研究。本研究以富营养化的南湖为模型,分析了开花期和非开花期之间浮游植物,浮游动物和细菌的群落变化,并进行了微浮游动物放牧实验,以测量微浮游动物的放牧压力和选择性。浮游植物群落。在开花期,南湖的浮游植物群落主要以蓝藻类为主(49.44%),尤其是圆藻鱼腥藻浮游微藻。轮虫是南湖浮游动物的主要成分(44.15%),萼花臂尾刺裸腹溞是在非开花,开花期最主要的浮游动物,分别。拟杆菌的开花期平均比例显着高于非开花期(p <0.001)。浮游植物的生长速率在-1.00 d -1至1.29 d -1之间,而微浮游动物的放牧速率在-1.15 d -1至1.05 d -1之间。。结果表明,微浮游植物可以在开花期对浮游植物的增加做出快速反应。同时,微浮游动物在花期和非花期分别对蓝藻和隐藻表现出放牧的偏好。开花期的微浮游植物放牧选择性可能取决于浮游植物群落组成。
更新日期:2021-05-06
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