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Effects of altered temperature and precipitation on desert protozoa associated with biological soil crusts

Journal of Eukaryotic Microbiology

By:
, , , , , ,
DOI: 10.1111/j.1550-7408.2006.00134.x

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Abstract

Biological soil crusts are diverse assemblages of bacteria, cyanobacteria, algae, fungi, lichens, and mosses that cover much of arid land soils. The objective of this study was to quantify protozoa associated with biological soil crusts and test the response of protozoa to increased temperature and precipitation as is predicted by some global climate models. Protozoa were more abundant when associated with cyanobacteria/lichen crusts than with cyanobacteria crusts alone. Amoebae, flagellates, and ciliates originating from the Colorado Plateau desert (cool desert, primarily winter precipitation) declined 50-, 10-, and 100-fold, respectively, when moved in field mesocosms to the Chihuahuan Desert (hot desert, primarily summer rain). However, this was not observed in protozoa collected from the Chihuahuan Desert and moved to the Sonoran desert (hot desert, also summer rain, but warmer than Chihuahuan Desert). Protozoa in culture began to encyst at 37??C. Cysts survived the upper end of daily temperatures (37-55??C), and could be stimulated to excyst if temperatures were reduced to 15??C or lower. Results from this study suggest that cool desert protozoa are influenced negatively by increased summer precipitation during excessive summer temperatures, and that desert protozoa may be adapted to a specific desert's temperature and precipitation regime. ?? 2006 by the International Society of Protistologists.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of altered temperature and precipitation on desert protozoa associated with biological soil crusts
Series title:
Journal of Eukaryotic Microbiology
DOI:
10.1111/j.1550-7408.2006.00134.x
Volume
53
Issue:
6
Year Published:
2006
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
507
Last page:
514
Number of Pages:
8