Studies on the ecological threshold of phytoplankton to the environmental gradient of salinity in the Yueqing bay,Zhejiang province,China
YANG Yi-yi1,2, LI Yi1,2, YE Shu-feng2,3
1. Shanghai Ocean University, Shanghai 201306, China;
2. East China Sea Environmental Monitoring Center State Oceanic Administration, Shanghai 201206, China;
3. Key Laboratory of Integrated Marine Monitoring and Applied Technologies for Harmful Algal Bl-ooms, State Oceanic Administration, Shanghai 201206, China
Abstract:This paper studies the response of phytoplankton cell density to environmental factors in the Yueqing bay based on the survey data of the Yueqing bay in May 2004.This study analyses the ecological threshold of phytoplankton density under the salinity environment gradient using the Gaussian model.The results show that the optimum salinity of phytoplankton growth is 26.12,the ecological threshold of salinity is[24.36,27.88],the optimum ecological threshold is[25.24,27.00],the corresponding salinity is 26.48 at the maximum cell density in the measured data,and it is within the range of optimum ecological threshold.It can provide the best reference value and early warning threshold for the sustainability of the marine ecosystem for the monitoring and early warning of the resources and environment carrying capacity of the sea area,and build an early-warning model for carrying capacity of marine resources and environment.
YANG Yi-yi,LI Yi,YE Shu-feng. Studies on the ecological threshold of phytoplankton to the environmental gradient of salinity in the Yueqing bay,Zhejiang province,China[J]. Marine Environmental Science, 2018, 37(4): 499-504.
HUGGETT A J.The concept and utility of ‘ecological thresholds’ in biodiversity conservation[J].Biological Conservation,2005,124(3):301-310.
[2]
COOPER D J,WATSON A J,NIGHTINGZLE I P D.Large decrease in ocean-surface CO2 fugacity in response to in situ iron fertilization[J].Nature,1996,383(6600):511-513
QUINLAN E L,PHLIPS E J.Phytoplankton assemblages across the marine to low-salinity transition zone in a blackwater dominated estuary[J].Journal of Plankton Research,2007,29(5):401-416.
[5]
LEMAIRE E,ABRIL G,DEWIT R,et al.Distribution of phytoplankton pigments in nine European estuaries and implications for an estuarine typology[J].Biogeochemistry,2002,59(1/2):5-23.
[6]
MUYLAERT K,SABBE K,VYVERMAN W.Changes in phytoplankton diversity and community composition along the salinity gradient of the Schelde estuary (Belgium/The Netherlands).[J].Estuarine Coastal and Shelf Science,2009,82(2):335-340.
NAIDOO G,KIFT J.Responses of the saltmarsh rush Juncus kraussii,to salinity and waterlogging[J].Aquatic Botany,2006,84(3):217-225.
[14]
DUPUIS A P,HANN B J.Warm spring and summer water temperatures in small eutrophic lakes of the Canadian prairies:potential implications for phytoplankton and zooplankton[J].Journal of Plankton Research2009,31(5):489-502.
LOPE M,CHAN K S,CIANNELLI L,et al.Effects of environmentalconditions on the seasonal distribution of phytoplankton biomassin the North Sea[J].Limnology and Oceanography,2009,54(2):512-524.