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Fire and simulated herbivory have antagonistic effects on resistance of savanna grasslands to alien shrub invasion
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Community and Conservation Ecology Group, University of Groningen, Groningen, The Netherlands.
Scientific Services, South African National Parks, Skukuza, South Africa.
Community and Conservation Ecology Group, University of Groningen, Groningen, The Netherlands.
2015 (English)In: Journal of Vegetation Science, ISSN 1100-9233, E-ISSN 1654-1103, Vol. 26, no 1, 114-122 p.Article in journal (Refereed) Published
Abstract [en]

Question: Resistance of the native community has been identified as an important factor limiting invasion success and invader impact. However, to what extent resistance interacts with disturbance to control invasion success remains unclear. We studied the interaction between biotic resistance, fire and small-scale disturbances mimicking those of large mammalian herbivores (hoof action and grazing) on invasion success of the alien shrub Chromolaena odorata.

Location: Hluhluwe-iMfolozi Park, South Africa.

Methods: We performed a seedling transplant experiment in a savanna grassland. We manipulated the grass layer by clipping (grazing), created small-scale soil disturbances (hoof action) and transplanted seedlings under native tree canopies to assess potential nursing effects. Subsequently, we burned half of our plots. We assessed the effect of fire and small-scale disturbances on seedling growth, survival and biomass allocation.

Results: Seedling survival of C. odorata was 26% in undisturbed savanna grassland, reducing to 5% post-fire. Small-scale disturbances increased seedling biomass and survival and modified biomass allocation, whereas fire greatly reduced seedling survival. Root allocation increased in response to grass clipping, while stem allocation decreased. Tree shading increased seedling survival in the absence of fire, but greatly reduced post-fire survival.

Conclusions: Grass communities in savannas exert a high level of biotic resistance to C. odorata invasion. However, small-scale disturbances, mimicking those of large mammalian herbivores, can facilitate the invasion of C. odorata in savanna grassland both directly, by creating micro-sites for establishment, and indirectly, by reducing the negative effect of fire. Thus, small-scale disturbances may aid the long-term persistence of woody species invading grass-dominated systems.

Place, publisher, year, edition, pages
2015. Vol. 26, no 1, 114-122 p.
Keyword [en]
Biological invasions, Chromolaena odorata, Competition, Disturbance, Exotic plant, Grazing, vasibility, Non-native, Seedling, Transplant
National Category
URN: urn:nbn:se:umu:diva-98421DOI: 10.1111/jvs.12208ISI: 000345704700013ScopusID: 2-s2.0-84911996304OAI: diva2:786056
Available from: 2015-02-04 Created: 2015-01-22 Last updated: 2015-02-04Bibliographically approved

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te Beest, Mariska
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