Read e-book online Elephants and Savanna Woodland Ecosystems: A Study from PDF

By Christina Skarpe, Johan T. du Toit, Stein R. Moe

ISBN-10: 0470671769

ISBN-13: 9780470671764

During the 19th century, ivory searching triggered a considerable lessen of elephant numbers in southern Africa. quickly after that, populations of many different huge and medium-sized herbivores went into steep decline as a result of the rinderpest pandemic within the Nineties. those occasions supplied a chance for forest institution in components formerly intensively used by elephants and different herbivores. The go back of elephants to presently secure parts in their former variety has drastically encouraged plants in the neighborhood and the ensuing strength unwanted effects on biodiversity are inflicting hindrance between stakeholders, managers, and scientists.

This e-book specializes in the ecological results of the expanding elephant inhabitants in northern Botswana, featuring the significance of the elephants for the heterogeneity of the method, and displaying that elephant ecology consists of a lot wider spatiotemporal scales than used to be formerly suggestion. Drawing at the result of their study, the authors speak about elephant-caused results on crops in nutrient-rich and nutrient-poor savannas, and the capability festival among elephants at the one hand and browsers and combined feeders at the other.

Ultimately this article presents a accomplished overview of ecological approaches in African savannas, protecting long term atmosphere alterations and human-wildlife conflicts. It summarises new wisdom at the ecology of the sub-humid African savanna ecosystems to increase the final practical figuring out of savanna ecosystems across moisture and nutrient gradients.

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Extra info for Elephants and Savanna Woodland Ecosystems: A Study from Chobe National Park, Botswana

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1998; Janis, 2008). 1 Traits of common woody species in the study area in Chobe National Park. The table is an extract from the Botswana Tree Data Base compiled by Roger Bergström, Christina Skarpe and Kjell Danell (unpublished) and based on a wide range of literature. All information is for the species generally and is not based solely on data from Chobe National Park. Growth form is more often based on architecture (shrubs are typically multistemmed, trees single-stemmed) than on height. Types of spines are given as prickles (≤1 cm; often hooked) and spines (>1 cm; generally straight).

The water level fluctuations in the Chobe River depend on contributions from different sources, primarily Zambezi and Kwando Rivers, and is out of phase with the local rainy season (October–April). Consequently, there are four distinct seasons in the floodplains along the river: (i) a low water rainy season from October to March; (ii) a high water (floodplains inundated) rainy season from March to April; (iii) a high water dry season from April to June and (iv) low water dry season from June to October.

In the riparian fringe of the nearby Linyanti River, local elephant densities of more than 20 animals km−2 have been reported in the dry season (Teren and Owen-Smith, 2010). Furthermore, at the global scale, the estimated 1200 kg km−2 of non-elephant herbivore biomass in Chobe is significant in itself, being about equivalent to that of Yellowstone in North America, for example. The biomass density of large herbivores in Yellowstone’s 1554 km2 Northern Range is estimated to have been about 1200 kg km−2 in the late 19th century, after which it climbed to what was arguably an unsustainable 2700 kg km−2 in the 1990s (Wagner, 2006).

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Elephants and Savanna Woodland Ecosystems: A Study from Chobe National Park, Botswana by Christina Skarpe, Johan T. du Toit, Stein R. Moe

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