000112697 001__ 112697
000112697 005__ 20190829172456.0
000112697 0247_ $$2doi$$a10.1657/1523-0430(2004)036[0078:ROTAPT]2.0.CO;2
000112697 037__ $$aARTICLE
000112697 245__ $$aResponse of testate amoebae (Protozoa) to N and P fertilization in an Arctic wet sedge tundra
000112697 269__ $$a2004
000112697 260__ $$c2004
000112697 336__ $$aJournal Articles
000112697 520__ $$aThere are few data on the effect of long-term manipulations on soil protozoa, and almost nothing is known about soil protozoa in Alaska. I studied the response of testate amoebae to nitrogen and phosphorus addition in an Arctic fen, at Toolik Lake Long-Term Experimental Research (LTER) Station, Alaska. Testate amoebae were extracted from Sphagnum mosses in control and fertilized plots. Of the 35 testate amoebae taxa recorded, 7 are first observations for the Arctic (excluding Russia) and 14 for Alaska. The total density and biomass of testate amoebae were significantly reduced, by 77% and 84%, in the fertilized plots. The structure of testate amoebae communities was also modified in those plots, although for most taxa the changes were not significant. Four taxa (Amphitrema flavum, Assulina muscorum, Placocista spinosa ssp. hyalina, and Hyalosphenia papilio) accounted for over half of the population in the control plots but only for 11% in the N and P plots. The densities of A. muscorum and Difflugia oviformis were significantly lower in the N and P–treated plots. The relative abundance and contribution to biomass of Centropyxis aerophila, Phryganella acropodia, and Tracheleuglypha dentata increased in the fertilized plots, while that of D. oviformis decreased. These effects suggest that testate amoebae respond to nutrient manipulations in the Arctic.
000112697 6531_ $$atestate amoebae
000112697 6531_ $$aAlaska
000112697 6531_ $$aArctic
000112697 6531_ $$aNitrogen
000112697 6531_ $$aphosphorous
000112697 6531_ $$afertilisation
000112697 6531_ $$aFERTILIZATION
000112697 6531_ $$aeutrophication
000112697 6531_ $$amosses
000112697 6531_ $$aSphagnum
000112697 6531_ $$apeatland
000112697 6531_ $$apoor fen
000112697 6531_ $$aspecies richness
000112697 6531_ $$adensity
000112697 6531_ $$atundra
000112697 6531_ $$aToolik
000112697 6531_ $$aLTER
000112697 6531_ $$aArctic
000112697 700__ $$aMitchell, E.A.D.
000112697 773__ $$j36$$tArctic Antarctic and Alpine Research$$k1$$q77-82
000112697 909C0 $$xU11021$$pECOS$$0252129
000112697 909CO $$qENAC$$particle$$ooai:infoscience.tind.io:112697
000112697 937__ $$aECOS-ARTICLE-2007-045
000112697 973__ $$rREVIEWED$$sPUBLISHED$$aOTHER
000112697 980__ $$aARTICLE