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Science 24 August 2001:
Vol. 293. no. 5534, pp. 1473 - 1477
DOI: 10.1126/science.1059936
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Reports

Genetic Evidence for Two Species of Elephant in Africa

Alfred L. Roca,1 Nicholas Georgiadis,2 Jill Pecon-Slattery,1 Stephen J. O'Brien1*

Elephants from the tropical forests of Africa are morphologically distinct from savannah or bush elephants. Dart-biopsy samples from 195 free-ranging African elephants in 21 populations were examined for DNA sequence variation in four nuclear genes (1732 base pairs). Phylogenetic distinctions between African forest elephant and savannah elephant populations corresponded to 58% of the difference in the same genes between elephant genera Loxodonta (African) and Elephas (Asian). Large genetic distance, multiple genetically fixed nucleotide site differences, morphological and habitat distinctions, and extremely limited hybridization of gene flow between forest and savannah elephants support the recognition and conservation management of two African species: Loxodonta africana and Loxodonta cyclotis.

1 Laboratory of Genomic Diversity, National Cancer Institute, Frederick, MD 21702, USA.
2 Mpala Research Center, Post Office Box 555, Nanyuki, Kenya.
*   To whom correspondence should be addressed. E-mail: obrien{at}ncifcrf.gov

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