Plant and Soil

, Volume 381, Issue 1–2, pp 395–404 | Cite as

Disturbances by desert rodents are more strongly associated with spatial changes in soil texture than woody encroachment

Regular Article

Abstract

Background and Aims

Soil texture is an important determinant of ecosystem structure and productivity in drylands, and may influence animal foraging and, indirectly, plant community composition.

Methods

We measured the density and composition of surface disturbances (foraging pits) of small, soil-foraging desert vertebrates in shrubland and grasslands, both with coarse- and fine-textured soils. We predicted that the density and functional significance of disturbances would be related more to differences in texture than shrub encroachment.

Results

Soil texture had a stronger influence on animal foraging sites than shrub encroachment. There were more disturbances, greater richness and abundance of trapped seed, and greater richness of germinating plants on coarse- than fine-textured soils. Pits in coarse soils trapped 50 % more litter than those in finer soils. Apart from slightly more soil removal and greater litter capture in shrubland pits, there were no effects of encroachment.

Conclusions

Although the process of woody encroachment has been shown to have marked effects on some ecosystem properties, it is likely to have a more subordinate effect on surface disturbances and therefore their effects on desert plant communities than soil texture. Our results highlight the importance of animal activity in shaping desert plant communities, and potentially, in maintaining or reinforcing shrub dominant processes.

Keywords

Bioturbation Drylands Seed capture Litter Foraging pits Encroachment Soils Shrubs 

Supplementary material

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Appendix S1(DOCX 623 kb)
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Appendix S2(DOCX 27 kb)
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Appendix S3(DOCX 27 kb)
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Appendix S4(DOCX 26 kb)
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Appendix S5(DOCX 27 kb)

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Centre for Ecosystem Science, School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia
  2. 2.USDA-ARS Jornada Experimental RangeMSC 3JER, New Mexico State UniversityLas CrucesUSA
  3. 3.School of BEESUniversity of NSWKensingtonAustralia

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