Document Type

Article

Journal/Book Title/Conference

Journal of Arid Environments

Volume

78

Publisher

Elsevier

Publication Date

2012

First Page

119

Last Page

127

Abstract

In African savannas, abandonment of traditional livestock corrals (bomas) creates long-term mosaics of nutrient hotspots embedded in a lower-nutrient matrix. It is unclear how plant communities develop over time on these sites in clay-rich “black cotton” soils or how herbivores attracted to these sites affect vegetation development. I first examined whether treeless “glades”, derived from abandoned bomas, function as nutrient and herbivore hotspots. Soil, vegetation, and herbivore data were collected on glades of varying ages. The results indicated that glades persist as long-term (≥four decades) patches (0.25–1.0 ha) of improved soil texture and increased nutrient levels, palatable grasses, and herbivore use. Glade vegetation also appears to undergo succession from Cynodon plectostachyus to Pennisetum stramineum dominance. Based on these patterns, exclusion cages were used to test herbivore effects on glade vegetation development. I found that large herbivores may retard succession by suppressing invasion of P. stramineum into C. plectostachyus-dominated areas. These results provide evidence that abundant anthropogenic glades function as long-term nutrient and wildlife hotspots in black cotton soils, distinct from similar hotspots in other soil types. The findings provide evidence that large herbivores can exert control over development and persistence of glades through their effects on plant community dynamics.

Comments

This is a final accepted manuscript. The published version may be accessed here http://dx.doi.org/10.1016/j.jaridenv.2011.10.016

The publisher retains the copyright to this work and may require a subscription to access the published version.

Please use publisher's recommended citation.

Download

Share

COinS