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Evidence for anthropic selection in Sheanut tree (Vitellaria paradoxa)

Evidence for anthropic selection in Sheanut tree (Vitellaria paradoxa)
Evidence for anthropic selection in Sheanut tree (Vitellaria paradoxa)
The Sheanut tree (Vitellaria paradoxa Gaertn.), a multi-purpose species highly valued for the oil obtained from its seeds, is commonly maintained in the semi-arid parklands of sub-Saharan West Africa. An inventory in the West Gonja District, Northern Region, Ghana, revealed that on intensively farmed land this species constituted 79.7 ± 7.2% (Basal area = 2.19 ± 0.64 m2 ha?1) of the woody biomass, on low intensity farmland 84.2 ± 10.0% (2.16 ± 0.57 m2 ha?1) and only 10.2 ± 3.3% (0.92 ± 0.23 m2 ha?1) in unmanaged woodland, with similar environmental characteristics. No significant differences were found between total Sheanut tree densities on different land use intensities, although as a proportion of all trees surveyed, large trees were more common on farmed land. Participatory surveys revealed that these populations are a direct result of anthropic selection as local farmers eliminate unwanted woody species on farmland, leaving only those Sheanut trees that meet criteria based on spacing, size, growth, health, age and yield. Characteristics that could affect population dynamics during traditional management and harvesting including short viability seeds and cryptogeal germination are also discussed with reference to unconscious selection. Tree improvement is currently constrained, as true to type varieties are difficult to propagate. It is proposed that Sheanut trees on farmland are semi-domesticated having been subject to long-term anthropic selection during cycles of traditional fallow and crop cultivation.
tree domestication, unconscious selection, vitellaria paradoxa gaertn
0167-4366
273-288
Haq, N.
d59a37ec-54c6-4267-be57-de498ae37c0b
Lovett, P.N.
0ab95d25-5a9c-4235-8e56-a6b684479f26
Haq, N.
d59a37ec-54c6-4267-be57-de498ae37c0b
Lovett, P.N.
0ab95d25-5a9c-4235-8e56-a6b684479f26

Haq, N. and Lovett, P.N. (2000) Evidence for anthropic selection in Sheanut tree (Vitellaria paradoxa). Agroforestry Systems, 48 (3), 273-288. (doi:10.1023/A:1006379217851).

Record type: Article

Abstract

The Sheanut tree (Vitellaria paradoxa Gaertn.), a multi-purpose species highly valued for the oil obtained from its seeds, is commonly maintained in the semi-arid parklands of sub-Saharan West Africa. An inventory in the West Gonja District, Northern Region, Ghana, revealed that on intensively farmed land this species constituted 79.7 ± 7.2% (Basal area = 2.19 ± 0.64 m2 ha?1) of the woody biomass, on low intensity farmland 84.2 ± 10.0% (2.16 ± 0.57 m2 ha?1) and only 10.2 ± 3.3% (0.92 ± 0.23 m2 ha?1) in unmanaged woodland, with similar environmental characteristics. No significant differences were found between total Sheanut tree densities on different land use intensities, although as a proportion of all trees surveyed, large trees were more common on farmed land. Participatory surveys revealed that these populations are a direct result of anthropic selection as local farmers eliminate unwanted woody species on farmland, leaving only those Sheanut trees that meet criteria based on spacing, size, growth, health, age and yield. Characteristics that could affect population dynamics during traditional management and harvesting including short viability seeds and cryptogeal germination are also discussed with reference to unconscious selection. Tree improvement is currently constrained, as true to type varieties are difficult to propagate. It is proposed that Sheanut trees on farmland are semi-domesticated having been subject to long-term anthropic selection during cycles of traditional fallow and crop cultivation.

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More information

Published date: May 2000
Keywords: tree domestication, unconscious selection, vitellaria paradoxa gaertn

Identifiers

Local EPrints ID: 74068
URI: http://eprints.soton.ac.uk/id/eprint/74068
ISSN: 0167-4366
PURE UUID: 2179aa81-abaf-4771-8e8f-8ff3ba70d134

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Date deposited: 11 Mar 2010
Last modified: 19 Jul 2019 23:40

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Contributors

Author: N. Haq
Author: P.N. Lovett

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