Bottom-up and top-down effects on phytoplankton functional groups in Hulun Lake, China

Chengxue Ma, Chang Zhao, Patteson Chula Mwagona, Ziyu Li, Zixuan Liu, Huashan Dou, Xuehong Zhou and Jehangir H. Bhadha

This study examines the effects of bottom-up (physical-chemical) and top-down (predation) factors on the phytoplankton functional groups in a eutrophic lake. The study revealed that the bottom-up effects of physical-chemical variables on some phytoplankton functional groups was stronger than the top-down effects of zooplankton. The study further showed that zooplankton functional groups were positively correlated with phytoplankton biomass implying that the top-down control of phytoplankton by the zooplankton in Lake Hulun is not strong enough to produce a negative effect. These finding serve as a basis for identifying how phytoplankton dynamics are influenced, which have implications for developing sustainable management strategies and conserving services of Lake Hulun and other eutrophic fresh water lakes.

Ann. Limnol. - Int. J. Lim., 57 (2021) 3
Published online: 19 January 2021
DOI: 10.1051/limn/2020028

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