Effects of fish farming on phytoplankton community under the thermal stress caused by a power plant in a eutrophic, semi-enclosed bay: induce toxic dinoflagellate (Prorocentrum minimum) blooms in cold seasons.
Six cruises were conducted in a fish farm adjacent to the Ninghai Power Plant in Xiangshan Bay, East China Sea. Fish farming significantly increased NH4(+), DIP, and TOC concentrations, while it significantly decreased the DO level. These increase/decrease trends were more pronounced in warmer seasons. Although culture practices did not significantly increase phytoplankton density, it drastically enhanced dinoflagellate abundance and domination. Significant differences in species diversity and community composition between the cages and the control area were also observed. Temperature elevation caused by thermal discharge associated with eutrophication resulted in a dominant species shift from diatoms alone to dinoflagellates and diatoms. This is the first report of stress-induced toxic dinoflagellate (Prorocentrum minimum) blooms in winter and the winter-spring transition in this bay. Therefore, the effects of aquaculture activity and power plant construction in such a eutrophic, semi-enclosed bay require further attention.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, No. 36 Baochubei Road, 310012 Hangzhou, China; Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, No. 36 Baochubei Road, 310012 Hangzhou, China; Key Laboratory of Applied Marine Biotechnology, Ministry of Education, Marine College of Ningbo University, No. 818 Fenghua Road, 315211 Ningbo, China.
Zhibing
Z
Jiang
Yibo
Y
Liao
Jingjing
J
Liu
Lu
L
Shou
Quanzhen
Q
Chen
Xiaojun
X
Yan
Genhai
G
Zhu
Jiangning
J
Zeng
D017756:Aquaculture; D061006:Bays / Q000737:chemistry; D002681:China; D017377:Diatoms; D004141:Dinoflagellida / Q000254:growth & development*; D004784:Environmental Monitoring; D005068:Eutrophication; D010839:Phytoplankton / Q000254:growth & development; D011210:Power Plants; D014873:Water Pollutants / Q000032:analysis*
D014873:Water Pollutants
Eutrophication; Fish farming; Phytoplankton; Prorocentrum minimum; Thermal discharge; Xiangshan Bay