Aloricate ciliates are the main component of microzooplankton.They play important roles in the circulation of materials and flow of energy in marine pelagic ecosystems.To determine the distribution pattern and structu...Aloricate ciliates are the main component of microzooplankton.They play important roles in the circulation of materials and flow of energy in marine pelagic ecosystems.To determine the distribution pattern and structure of the aloricate ciliate community in vertically stratified waters of the Southern Ocean,we collected data on aloricate ciliates in the Cosmonaut and Cooperation Seas during the 36th Chinese National Antarctic Research Expedition.The ranges of aloricate ciliate abundance and biomass were 5-3097 ind·L^(-1)and 0.01-11.40μg C·L^(-1),respectively.Vertically,the average abundance of aloricate ciliates decreased from the surface to 200 m,while biomass was highest in the 50-m layer.The importance of aloricate ciliates<20μm increased along the depth gradient.Their contribution to total abundance increased from 13.04%in the surface layer to 73.71% in the 200-m layer.This is the first study to explore the distribution characteristics of the aloricate ciliate community in a stratified water column of the Southern Ocean.Our results will be helpful for understanding the variation in the pelagic community in waters of the Southern Ocean with intensified stratification.展开更多
As one of the main groups of marine planktonic protozoa,oligotrich ciliates have shown a high biodiversity.Recently,a new aloricate oligotrich ciliate,Strombidium pseudorapulum sp.n.was isolated from coastal waters of...As one of the main groups of marine planktonic protozoa,oligotrich ciliates have shown a high biodiversity.Recently,a new aloricate oligotrich ciliate,Strombidium pseudorapulum sp.n.was isolated from coastal waters of southeast China.The living morphology and infraciliature of this species were studied using live cell observation and protargol impregnation.Strombidium pseudorapulum sp.n.differs from its congeners by having a radish-like body with a bumped anterior end and an elongated tail-like posterior end,possessing a red‘eyespot’in apical protrusion of cell,adoral zone of membranelles composed of 12–16 collar and 9–12 buccal membranelles,one spindle-shaped macronucleus,girdle kinety in anterior 2/5 of cell with 45–60 densely spaced dikinetids,and ventral kinety occupying about the posterior 1/3 of the cell with 16–19 dikinetids.Strombidium pseudorapulum sp.n.clusters together with those species having‘eyespot’in apical protrusion in the phylogenetic tree based on the small subunit rRNA gene sequence.It is a sister species of S.cuneiforme with 31 unmatched nucleotides between their SSU rRNA gene sequences.展开更多
基金supported by the National Polar Special Program“Impact and Response of Antarctic Seas to Climate Change”(Grant no.IRASCC 01-02-01D)the National Natural Science Foundation of China(Grant nos.41706192,41806178)。
文摘Aloricate ciliates are the main component of microzooplankton.They play important roles in the circulation of materials and flow of energy in marine pelagic ecosystems.To determine the distribution pattern and structure of the aloricate ciliate community in vertically stratified waters of the Southern Ocean,we collected data on aloricate ciliates in the Cosmonaut and Cooperation Seas during the 36th Chinese National Antarctic Research Expedition.The ranges of aloricate ciliate abundance and biomass were 5-3097 ind·L^(-1)and 0.01-11.40μg C·L^(-1),respectively.Vertically,the average abundance of aloricate ciliates decreased from the surface to 200 m,while biomass was highest in the 50-m layer.The importance of aloricate ciliates<20μm increased along the depth gradient.Their contribution to total abundance increased from 13.04%in the surface layer to 73.71% in the 200-m layer.This is the first study to explore the distribution characteristics of the aloricate ciliate community in a stratified water column of the Southern Ocean.Our results will be helpful for understanding the variation in the pelagic community in waters of the Southern Ocean with intensified stratification.
基金the National Natural Science Foundation of China(No.31761133001)the Guangdong MEPP Fund(No.GDOE(2019)A23)+1 种基金the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019ZD0405)Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences(No.ISEE 2018PY01).
文摘As one of the main groups of marine planktonic protozoa,oligotrich ciliates have shown a high biodiversity.Recently,a new aloricate oligotrich ciliate,Strombidium pseudorapulum sp.n.was isolated from coastal waters of southeast China.The living morphology and infraciliature of this species were studied using live cell observation and protargol impregnation.Strombidium pseudorapulum sp.n.differs from its congeners by having a radish-like body with a bumped anterior end and an elongated tail-like posterior end,possessing a red‘eyespot’in apical protrusion of cell,adoral zone of membranelles composed of 12–16 collar and 9–12 buccal membranelles,one spindle-shaped macronucleus,girdle kinety in anterior 2/5 of cell with 45–60 densely spaced dikinetids,and ventral kinety occupying about the posterior 1/3 of the cell with 16–19 dikinetids.Strombidium pseudorapulum sp.n.clusters together with those species having‘eyespot’in apical protrusion in the phylogenetic tree based on the small subunit rRNA gene sequence.It is a sister species of S.cuneiforme with 31 unmatched nucleotides between their SSU rRNA gene sequences.
