The potential impacts of temperature and nutrient levels on freshwater bacterioplankton community structure

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Journal of Nanjing University(Natural Sciences) ›› 2016, Vol. 52 ›› Issue (4) : 590.

Chen Zhen^1，2，He Dan^2，3，Ren Lijuan²*

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Abstract

To investigate bacterioplankton community composition(BCC)under different temperature and nutrient conditions，18 microcosms combining three temperature scenarios(15 ℃，25 ℃and 35 ℃，respectively)and two nutrient levels(control and enriched)were established.After three months experiment，water environmental factors，plant biomass(mainly Filamentous green aglea，FGA)，bacterioplankton community abundance and composition were studied.Extremely differences of DO，pH，NON，NON，FGA biomass were detected under different temperature and nutrient treatments.Both increased temperature(25 ℃and 35 ℃)and nutrient enrichment stimulated the extensive growth of FGA.The proliferation of FGA had pronounced removal of water nutrients，so that the concentrations of N and P together with the bacterioplankton abundance were similar in nutrient enriched groups.In 15 ℃treatments without nutrient enrichment，the influence of FGA was least and the nutrient concentrations were evidently higher than others，thus BCC there was pronouncedly different from the other treatments.Between 15 ℃treatments without nutrient enrichment and the other treatments，the BCC divergence increased with the increasing differences of temperatures.In summary，we found that temperature and nutrient，as important abiotic factors for freshwater ecosystems，had complex interactions with plants and bacterioplankton community composition in freshwater ecosystem.The elevated temperature and nutrient conditions not only directly shifted BCC，but also indirectly impacted BCC through the growth of FGA.

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Chen Zhen^1，2，He Dan^2，3，Ren Lijuan²*. The potential impacts of temperature and nutrient levels on freshwater bacterioplankton community structure[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(4): 590

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