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Chapter 13 - How Large Herbivores Transform Savanna Ecosystems
from Part III - The Big Mammal Menagerie: Herbivores, Carnivores and Their Ecosystem Impacts
Norman Owen-Smith, University of the Witwatersrand, Johannesburg
Book:

Only in Africa

Published online:

09 September 2021

Print publication:

07 October 2021, pp 199-219
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Summary

This chapter looks more broadly at interactions. Total herbivore biomass and consequent consumption of vegetation depends on the basic soil fertility. Mean levels underestimate local offtake, particularly in drought years. Heavy grazing suppresses the spread of fires so that more vegetation gets digested than incinerated. Browsing on tree seedlings can counteract woody plant expansion following heavy grazing. Elephants cause large tree mortality by toppling and debarking and can transform savanna woodlands into open grasslands or shrub coppice, especially on fertile soils. Termites promote the decomposition of vegetation not consumed by herbivores or incinerated by fires and contribute to nutrient cycling. Sodium is available through different routes. Large herbivores amplify the spatial heterogeneity inherent in savannas in various ways.

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Chapter 13 - How Large Herbivores Transform Savanna Ecosystems

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Chapter 13 - How Large Herbivores Transform Savanna Ecosystems

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