Bottom-up and top-down controls of the phytoplankton standing stock off the Changjiang Estuary

Song Hongjun; Zhang Xuelei; Wang Baodong; Sun Xia; Wang Xiao; Xin Ming

doi:10.3969/j.issn.0253-4193.2014.08.010

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Song Hongjun, Zhang Xuelei, Wang Baodong, Sun Xia, Wang Xiao, Xin Ming. Bottom-up and top-down controls of the phytoplankton standing stock off the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(8): 91-100. doi: 10.3969/j.issn.0253-4193.2014.08.010

Citation:

Song Hongjun, Zhang Xuelei, Wang Baodong, Sun Xia, Wang Xiao, Xin Ming. Bottom-up and top-down controls of the phytoplankton standing stock off the Changjiang Estuary[J]. Haiyang Xuebao, 2014, 36(8): 91-100. doi: 10.3969/j.issn.0253-4193.2014.08.010

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Bottom-up and top-down controls of the phytoplankton standing stock off the Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2014.08.010

The First Institution of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Lab of Science and Engineering for Marine Ecology and Environment, State Oceanic Administration, Qingdao 266061, China

Received Date: 2013-08-12
Rev Recd Date: 2014-02-10

Abstract

Abstract

Based on the field survey data in August 2010, November 2010 and May 2011, and the following analysis from generalized additive model (GAM), the bottom-up and top-down effects on the phytoplankton standing stock (represented as chlorophyll a concentrations) off the Changjiang Estuary were studied. The results showed that the average concentrations of nutrients in the high chlorophyll zone (HCZ) were lower than those in the entire region. The concentrations of phosphate (0.48 μmol/L) and silicate (8.96 μmol/L) in spring in HCZ were the lowest among the three seasons, and the DIN/P ratio (43.3) was the highest, which help to the frequent dinoflagellate bloom in spring. The Si/DIN ratio in the HCZ was higher than that in the entire region in summer, but very close in spring and autumn, which help to the diatom bloom in summer. The concentrations of total suspended solids (TSS) in the HCZ in spring and summer were significantly low in both spatial and seasonal scale. The spatial distribution of high zooplankton biomass zone was not consistent with the HCZ, but they were crossed or neighboring. The further analysis from GAM showed that the environmental factors can explain more than 70% variability of chlorophyll (log-transformed) off the Changjiang Estuary. Salinity and nutrients were the main factors, while the TSS, zooplankton and temperature had no significant direct correlation with the chlorophyll variability (p>0.05). Moreover, due to the impact of Changjiang Diluted Water, the salinity was significantly correlated to the DIN, phosphate, silicate and TSS (p<0.001), which suggested that the effect of salinity on explaining the chlorophyll variability involved those of both the nutrient and the light. Our results suggested that the bottom-up effects from nutrients were the main control of the phytoplankton standing stock off the Changjiang Estuary. Light condition and zooplankton biomass had a certain relation with the phytoplankton standing stock on the spatial and seasonal distribution, but they were not the key controlling factors.
- phytoplankton,
- nutrients,
- zooplankton,
- generalized additive model,
- Changjiang Estuary

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Bottom-up and top-down controls of the phytoplankton standing stock off the Changjiang Estuary

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