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hydrobiological variables as a regulatory factor on the abundance of heterotrophic flagellates in an urban pond

Journal of Oceanology and Limnology 2019年第3期37卷 1030-1036页

作者： BEGUM Moni JEWEL Md.Abu Sayed HAQUE Md.Ayenuddin KHATUN Mst.Samsad Department of Fisheries Faculty of Agriculture University of Rajshahi

The seasonal abundance of flagellates has been monitored over a period of 1 year from December 2013 to November 2014(divided into 4 conjugative seasons namely winter,spring,summer,and autumn)in an experimental pond located in Rajshahi City Corporation area,*** our knowledge,this study is the fi rst to shed light on the occurrence and possible interrelationships among heterotrophic flagellates(HF),bacteria and zooplankton in Bangladesh and the result obtained by this study will be beneficial for similar water ecosystem all over the *** methods were used to determine the prescribed hydrological parameters and zooplankton cell *** HF abundance(14 346.00 cells/mL)was found in the spring and the minimum(5 215.00 cells/mL)occurred in the *** to HF,significantly(P<0.05)higher zooplankton abundance was found during the winter(782.00±47.62 cells/mL)and the lowest value was found in the autumn(448.00±39.15 cells/mL).Whereas similar to the HF,total bacterial abundance was significantly higher during the spring((2.25±1.05)×10^5 cells/mL)and lower in the summer((0.79±0.06)×10^5 cells/mL).Multivariate analyses(ANOSIM and MDS)have shown significant seasonal differences for cell numbers where MDS ordination plot and cluster analysis based on similarity in the genera abundance of HF revealed overlapping condition between winter and *** correspondence analysis(CCA)also showed a distinct separation among the genera based on the prevailing hydrological situation and indicated that temperature,pH,BOD5,and NO3^-were the most important environmental variables in determining the observed variation in HF community *** the biological factors,zooplankton showed negative but total bacteria were positively correlated with HF abundance.

关键词： heterotrophic flagellates abundance hydrobiological factors urban pond

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