Abstract
The increase of nutrient input into coastal seawaters has caused severe eutrophication and changed the phytoplankton and bacterioplankton community in different ways. A 10-day mesocosm experiment was carried out in Nan'ao with nine mesocosms (M0–M8) by adding different combinations of N, P and Si, either on the first day only or in a daily enrichment during the experiment, in order to assess the response of phytoplankton and the bacterioplankton community. The results showed that phytoplankton abundance increased with nutrient enrichment and over 95% of total identified phytoplankton species was dominated by diatoms and dinoflagellates. Algal blooms were observed in M6 and M7 on day 7 and day 10, with a peak value of phytoplankton cell density in M6 and M7 of 9.92×106 cells/l and 4.59×107 cells/l, respectively. A-proteobacteria and γ-proteobacteria dominated the bacterioplankton community in all experimental mesocosms. Lower N:P ratio in the mesocosm seawater led to higher biodiversity of bacterioplankton. The results also indicated that bacterioplankton and phytoplankton had an opposite nutrient uptake strategy. Bacterioplankton is introduced in the analysis of nutrient enrichment of the plankton community, and this study would benefit from further research on food webs and biogeochemical cycles and will help to resolve the existing eutrophication problems in Nan'ao.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
