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Elephant seasonal vegetation preferences across dry and wet savannas

Publication ,  Journal Article
Loarie, SR; van Aarde, RJ; Pimm, SL
Published in: Biological conservation.
December 2009

As African savanna elephants (Loxodonta africana) become increasingly confined to smaller fragmented landscapes, concern over their potential detrimental impacts on vegetation and biodiversity has increased. Understanding elephant vegetation preferences across relevant spatial and temporal scales is a critical step towards managing protected areas for the persistence of both elephants and biodiversity. To better understand elephant vegetation selection, we fitted 68 elephants with GPS collars across a strong rainfall gradient spanning seven southern African countries over a period of 6years. We compared elephant locations with remotely-sensed environmental data that measure bi-monthly vegetation greenness across the study area. Elephants consistently seek out greener than expected vegetation throughout the year. Interestingly, they do so by utilizing vegetation with different phenologies and by selecting landscapes when they are greener than their surroundings. We found no differences between dry and wet savannas. These patterns persist even when elephants are constrained by seasonally available water. In the wet season, elephants select seasonally variable landscapes such as open woodlands, shrublands, and grasslands. These landscapes have a lower average annual greenness but become very green for a few months in the wet season. In the dry season, elephants prefer less variable landscapes that are more consistently green year-round such as well-wooded areas and closed woodlands. Because elephants prefer different vegetation types at different times of the year, small homogeneous protected areas may be unsuitable for elephants. Since elephants prefer woody vegetation during the dry season when they are constrained by water, human actions that increase dry season water availability may contribute to detrimental elephant impacts on vegetation and biodiversity.

Duke Scholars

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Published In

Biological conservation.

DOI

ISSN

0006-3207

Publication Date

December 2009

Volume

142

Issue

12

Start / End Page

3099 / 3107

Related Subject Headings

  • Ecology
  • 4104 Environmental management
  • 3109 Zoology
  • 3103 Ecology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
 

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Loarie, S. R., van Aarde, R. J., & Pimm, S. L. (2009). Elephant seasonal vegetation preferences across dry and wet savannas. Biological Conservation., 142(12), 3099–3107. https://doi.org/10.1016/j.biocon.2009.08.021
Loarie, Scott R., Rudi J. van Aarde, and Stuart L. Pimm. “Elephant seasonal vegetation preferences across dry and wet savannas.” Biological Conservation. 142, no. 12 (December 2009): 3099–3107. https://doi.org/10.1016/j.biocon.2009.08.021.
Loarie SR, van Aarde RJ, Pimm SL. Elephant seasonal vegetation preferences across dry and wet savannas. Biological conservation. 2009 Dec;142(12):3099–107.
Loarie, Scott R., et al. “Elephant seasonal vegetation preferences across dry and wet savannas.” Biological Conservation., vol. 142, no. 12, Dec. 2009, pp. 3099–107. Epmc, doi:10.1016/j.biocon.2009.08.021.
Loarie SR, van Aarde RJ, Pimm SL. Elephant seasonal vegetation preferences across dry and wet savannas. Biological conservation. 2009 Dec;142(12):3099–3107.
Journal cover image

Published In

Biological conservation.

DOI

ISSN

0006-3207

Publication Date

December 2009

Volume

142

Issue

12

Start / End Page

3099 / 3107

Related Subject Headings

  • Ecology
  • 4104 Environmental management
  • 3109 Zoology
  • 3103 Ecology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences