Resource islands predict the distribution of heterotrophic bacteria in chihuahuan desert soils.

Applied and Environmental Microbiology
R P HermanR J Torrez

Abstract

The resource island hypothesis predicts that soil resources such as nitrogen, phosphorus, and water will be distributed evenly in grasslands but have a patchy distribution focused around plants in shrublands. This hypothesis predicts that microorganism numbers will follow resources and be (i) evenly distributed in grasslands, (ii) concentrated around individual plants in shrublands, and (iii) higher where resources are higher when comparing the same vegetation type. This study enumerated total heterotrophic bacteria and a subset of these, the nitrogen-efficient guild (NEG), in three shrublands (playa fringe mesquite, tar bush, and creosote) and two grasslands (playa and bajada). Both heterotrophs and NEG members followed the distribution pattern predicted by the resource island hypothesis. There were no significant differences in heterotroph or NEG numbers comparing at-plant and interplant samples for both the playa and bajada grasslands. Furthermore, populations were generally higher in nutrient-rich playa grasslands than nutrient-poor bajada grasslands. In contrast, both heterotroph and NEG numbers were higher at shrubs than between shrubs in all three shrub sites. These results suggest that resource abundance in resource isl...Continue Reading

References

Apr 1, 1994·Applied and Environmental Microbiology·R P HermanG M Seager
Mar 2, 1990·Science·W H SchlesingerW G Whitford

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Citations

Dec 25, 2009·The ISME Journal·Roey AngelOsnat Gillor
Mar 1, 2015·FEMS Microbiology Reviews·Thulani P MakhalanyaneDon A Cowan
Jun 5, 2013·FEMS Microbiology Ecology·Roey AngelOsnat Gillor
Dec 31, 2002·The Journal of Eukaryotic Microbiology·Bret S RobinsonPhilip J Dobson
Aug 14, 2012·Applied and Environmental Microbiology·David R AndrewKaterina Dontsova
May 16, 2018·Ecology and Evolution·Gregory P ZoggDaniel A Brazeau

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