Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29993
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: The Role of Forest Elephants in Shaping Tropical Forest-Savanna Coexistence
Author(s): Cardoso, Anabelle W
Malhi, Yadvinder
Oliveras, Imma
Lehmann, David
Ndong, Josué Edzang
Dimoto, Edmond
Bush, Emma
Jeffery, Kathryn
Labriere, Nicolas
Lewis, Simon L
White, Lee T J
Bond, William
Abernethy, Katharine
Contact Email: k.a.abernethy@stir.ac.uk
Keywords: ecosystem engineer
alternative stable states
forest elephants
Loxodonta cyclotis
fire
forest–savanna mosaic
Gabon
Issue Date: Apr-2020
Citation: Cardoso AW, Malhi Y, Oliveras I, Lehmann D, Ndong JE, Dimoto E, Bush E, Jeffery K, Labriere N, Lewis SL, White LTJ, Bond W & Abernethy K (2020) The Role of Forest Elephants in Shaping Tropical Forest-Savanna Coexistence. Ecosystems, 23 (3), p. 602–616. https://doi.org/10.1007/s10021-019-00424-3
Abstract: Forest edges that border savanna are dynamic features of tropical landscapes. Although the role of fire in determining edge dynamics has been relatively well explored, the role of mega-herbivores, specifically elephants, has not received as much attention. We investigated the role of forest elephants in shaping forest edges of the forest–savanna mosaic in Lopé National Park, Gabon. Using forty camera traps, we collected 1.2 million images between May 2016 and June 2017. These images were classified by over 10,000 volunteers through an online citizen science platform. These data were combined with a 33-year phenology dataset on elephant-favoured fruiting tree species, and field measurements of elephant browsing preferences and damage. Our results showed a strong relationship between forest elephant density at the forest edge and fruit availability. When fruit availability was high, elephant density at the edge reached values nearly double the highest densities ever reported in any other part of the landscape (7.5 elephants km−2 in this study vs the previous highest estimate of 4 elephants km−2). The highest elephant densities occurred at the end of the dry season, but even outside of this high density period elephant density at the forest edge (2.4 elephants km−2) was more than double what other studies estimate for forest interiors with low human hunting pressure (1 elephant km−2). We found forest elephants to be selective browsers, but their browsing was non-destructive (in contrast to savanna elephants) and had little effect on tree size demography. Elephant paths acted as firebreaks during savanna burning, making them inadvertent protectors of the fire-sensitive forest and contributing to the stabilising feedbacks that allow forest and savanna to coexist in tropical landscapes.
DOI Link: 10.1007/s10021-019-00424-3
Rights: © The Author(s) 2019 This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

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