Relationship between phytoplankton functional groups and environmental factors in Jinan region,Shandong Province

The community structure of phytoplankton and environmental factors were investigated in Jinan region in May of 2014( wet season) and in October of 2014( dry season),and the structural characteristics of the phytoplankton functional groups were evaluated by Shannon-Weiner index,Pielou index,Canonical correspondence analysis and other methods to elucidate the relationship between the community structure of phytoplankton and the associated environmental factors. Ninety phytoplankton species were found in wet season and 66 species were observed in dry season,with average phytoplankton density of 3. 94 ×106cells / L in wet season and 8. 12 ×106cells / L in dry season,Shannon-Wiener index of 2. 72 in wet season and 3. 14 in dry season,and Pielou index of 1. 07 in wet season and 1. 14 in dry season. There were 17 phytoplankton functional groups in the whole basin of Jinan region,17 groups in wet season and 12 groups in dry season,and with the maximal MP functional group among the representative phytoplankton functional groups. Multi-response permutation procedures showed that there was a significant spatial heterogeneity in the phytoplankton community structure and spatial distribution between wet season and dry season. Canonical correspondence analysis revealed that phytoplankton community structure was heavily dependent of the interactions between dissolved total phosphorus( TP) and water temperature( Temp) in the wet season. While p H was the main environmental factors imposing restrictions on phytoplankton community structure in the dry season in Huang River. In Huai River,the primarily environmental factors limiting phytoplankton community was electrical conductivity in wet season,while DO was the main factor in dry season. It is concluded that the dynamic changes in phytoplankton functional groups in the two river basins are relatively obvious in Jinan Region.