Background Algae play important roles in urban river ecosystems and are the cornerstones of most water quality monitoring programs.Thus,a better understanding of algal community dynamics is needed to support sustainab...Background Algae play important roles in urban river ecosystems and are the cornerstones of most water quality monitoring programs.Thus,a better understanding of algal community dynamics is needed to support sustainable management of water resources in urban rivers.Results In this study,we quantifed the seasonal variations in planktonic and periphytic algal community structure in the highly urban Fenhe River and identifed environmental factors afecting algal community structure and diversity.We monitored planktonic(drifting)and periphytic(attached)algal communities in the Taiyuan section of the Fenhe River over one year.The results indicated that Cyanophyta was the dominant phylum in both communities,followed by Bacillariophyta and Chlorophyta.Signifcant diferences were observed in the composition of the planktonic and periphytic algal communities.In particular,the periphytic algal community was more diverse than the planktonic community.Water temperature and pH were the main environmental factors afecting planktonic and periphytic algal community structure,respectively,while nutrients were the most signifcant factor afecting planktonic and periphytic algal diversity.Ecological modeling indicated that the variations in the algal communities of the Fenhe River are mainly driven by stochastic processes.A co-occurrence network developed for the communities displayed positive interactions between the planktonic and periphytic algae.Conclusions These fndings deepen our understanding of the seasonal interaction between planktonic and periphytic algae and the driving factors afecting community structure in the Fenhe River.They also provide a theoretical basis for the managing and protecting water resources in urban river ecosystems.展开更多
Given their varied physiological and ecological attributes, phytoplankton frequently exhibit disparate responses to changes in environmental conditions. Therefore, when studying modifications in the structure of a phy...Given their varied physiological and ecological attributes, phytoplankton frequently exhibit disparate responses to changes in environmental conditions. Therefore, when studying modifications in the structure of a phytoplankton community, it is necessary to consider such differences and investigate the underlying mechanisms. Through a field sampling study of 26 lakes, we found that the differing responses of phytoplankton to changes in environmental factors were partly related to their genome size. The Cyanobacteria and Chrysophyta, which possess smaller genomes, exhibited a relatively low degree of sensitivity to alterations in nutrient concentrations. However, they demonstrated a stronger dependence on the metabolic processes of environmental microorganisms compared to other phytoplankton with larger genomes. Furthermore, the Cyanobacteria and Chrysophyta were more closely associated with environmental nutrients and water chemistry and were more actively involved in interspecific interactions among phytoplankton. By randomly deleting sample points, we verified the generality of the above conclusions. However, more refined grouping analyses indicate that diatoms exhibited different ecological characteristics due to their physiological and morphology. The present study offers new insights into the mechanisms underlying the ecological adaptations of phytoplankton and may provide new guidance for the management of Cyanobacterial blooms. Further studies could take a more refined approach to investigate the effect of phytoplankton “effective genome size” on their adaptive capacity.展开更多
基金funded by the National Nature Science Foundation of China(Nos.32270220 and U22A20445 to Jia Feng)the Excellent Achievement Cultivation Project of Higher education in Shanxi(No.2020KJ029)the Nature Science Foundation of Shanxi Province(No.202203021211313).
文摘Background Algae play important roles in urban river ecosystems and are the cornerstones of most water quality monitoring programs.Thus,a better understanding of algal community dynamics is needed to support sustainable management of water resources in urban rivers.Results In this study,we quantifed the seasonal variations in planktonic and periphytic algal community structure in the highly urban Fenhe River and identifed environmental factors afecting algal community structure and diversity.We monitored planktonic(drifting)and periphytic(attached)algal communities in the Taiyuan section of the Fenhe River over one year.The results indicated that Cyanophyta was the dominant phylum in both communities,followed by Bacillariophyta and Chlorophyta.Signifcant diferences were observed in the composition of the planktonic and periphytic algal communities.In particular,the periphytic algal community was more diverse than the planktonic community.Water temperature and pH were the main environmental factors afecting planktonic and periphytic algal community structure,respectively,while nutrients were the most signifcant factor afecting planktonic and periphytic algal diversity.Ecological modeling indicated that the variations in the algal communities of the Fenhe River are mainly driven by stochastic processes.A co-occurrence network developed for the communities displayed positive interactions between the planktonic and periphytic algae.Conclusions These fndings deepen our understanding of the seasonal interaction between planktonic and periphytic algae and the driving factors afecting community structure in the Fenhe River.They also provide a theoretical basis for the managing and protecting water resources in urban river ecosystems.
基金funded by the National Natural Science Foundation of China(No.32270220 and U22A20445 to Jia Feng)the Excellent Achievement Cultivation Project of Higher education in Shanxi(No.2020KJ029)the Nature Science Foundation of Shanxi Province(No.202203021211313).
文摘Given their varied physiological and ecological attributes, phytoplankton frequently exhibit disparate responses to changes in environmental conditions. Therefore, when studying modifications in the structure of a phytoplankton community, it is necessary to consider such differences and investigate the underlying mechanisms. Through a field sampling study of 26 lakes, we found that the differing responses of phytoplankton to changes in environmental factors were partly related to their genome size. The Cyanobacteria and Chrysophyta, which possess smaller genomes, exhibited a relatively low degree of sensitivity to alterations in nutrient concentrations. However, they demonstrated a stronger dependence on the metabolic processes of environmental microorganisms compared to other phytoplankton with larger genomes. Furthermore, the Cyanobacteria and Chrysophyta were more closely associated with environmental nutrients and water chemistry and were more actively involved in interspecific interactions among phytoplankton. By randomly deleting sample points, we verified the generality of the above conclusions. However, more refined grouping analyses indicate that diatoms exhibited different ecological characteristics due to their physiological and morphology. The present study offers new insights into the mechanisms underlying the ecological adaptations of phytoplankton and may provide new guidance for the management of Cyanobacterial blooms. Further studies could take a more refined approach to investigate the effect of phytoplankton “effective genome size” on their adaptive capacity.
