The Antarctic runnel can be highly variable in space and time; however, this environment has provided aninteresting habitat for terrestrial algal colonization. The runnel of Reeve Hill, Casey Station (66°16.855′...The Antarctic runnel can be highly variable in space and time; however, this environment has provided aninteresting habitat for terrestrial algal colonization. The runnel of Reeve Hill, Casey Station (66°16.855′S, 110°31.045′E), Antarctica, which occurs intermittently only during the brief austral summer showed high colonization by microalgaedominated mainly by Cyanobacteria mats and diatoms. 9 freshwater microalgae species which includesOscillatoria frac-ta, Oscillatoriasp., Navicula muticopsis, Pinnularia borealis, Nitzschiasp., Prasiola crispa, Chlorococcumsp., Syene-chococcus aeruginosusandSyenechococcus maiorwere recorded during the study. The algal community in the runnel to beobserved closely resembles that in the larger running water ecosystems in the continent. However, intrusion of seawater,direct exposure to sunlight and influence of sea current in the lower part changes the species community. The lower run-nel showed total dominance consists mainly of the marine planktonic Bacillariophycea. Other species detected includes Flagilaria kerguelensis, Flagilaria linearis, Eucampia antarctica, Thalassiosira tumida,Pseudonitzschia lineola, Pseud-onitzschia turgiduloides, Achnanthes brevipesand Odontella litigiosa. Lower algal species diversity observed in this studysuggests that the number of species obtained is related to the area of environment from which the samples were derived.The local assemblages simply contain species that is favored by the environmental conditions.展开更多
文摘The Antarctic runnel can be highly variable in space and time; however, this environment has provided aninteresting habitat for terrestrial algal colonization. The runnel of Reeve Hill, Casey Station (66°16.855′S, 110°31.045′E), Antarctica, which occurs intermittently only during the brief austral summer showed high colonization by microalgaedominated mainly by Cyanobacteria mats and diatoms. 9 freshwater microalgae species which includesOscillatoria frac-ta, Oscillatoriasp., Navicula muticopsis, Pinnularia borealis, Nitzschiasp., Prasiola crispa, Chlorococcumsp., Syene-chococcus aeruginosusandSyenechococcus maiorwere recorded during the study. The algal community in the runnel to beobserved closely resembles that in the larger running water ecosystems in the continent. However, intrusion of seawater,direct exposure to sunlight and influence of sea current in the lower part changes the species community. The lower run-nel showed total dominance consists mainly of the marine planktonic Bacillariophycea. Other species detected includes Flagilaria kerguelensis, Flagilaria linearis, Eucampia antarctica, Thalassiosira tumida,Pseudonitzschia lineola, Pseud-onitzschia turgiduloides, Achnanthes brevipesand Odontella litigiosa. Lower algal species diversity observed in this studysuggests that the number of species obtained is related to the area of environment from which the samples were derived.The local assemblages simply contain species that is favored by the environmental conditions.
