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Podocarps in Africa: temperate zone relicts or rainforest survivors?

Adie, Hylton and Lawes, Michael J. (2011). Podocarps in Africa: temperate zone relicts or rainforest survivors?. Smithsonian Contributions to Botany,95:79-100.

Document type: Journal Article
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IRMA ID 82057923xPUB79
Title Podocarps in Africa: temperate zone relicts or rainforest survivors?
Author Adie, Hylton
Lawes, Michael J.
Journal Name Smithsonian Contributions to Botany
Publication Date 2011
Volume Number 95
ISSN 0081-024X   (check CDU catalogue  open catalogue search in new window)
Start Page 79
End Page 100
Total Pages 22
Editor Turner, Benjamin L.
Cernusak, Lucas
Place of Publication United States
Publisher Smithsonian Institution Press
Abstract Podocarp distribution in Africa follows a discontinuous mountainous belt from Cameroon to Angola in the west and from Ethiopia in the northeast to the southern Cape in South Africa. Besides a relict population of Afrocarpus falcatus in coastal lowland forest in northeastern South Africa and southern Mozambique, African podocarps are generally limited to highland (Afrotemperate) regions. All podocarps are restricted to montane regions in Madagascar. Afrotemperate landscapes are characterized by a patchy mosaic of forest and grassland. Processes in the matrix, such as fire, are important drivers of forest distribution in the highland regions. Here we examine the relative performance of podocarps and angiosperms along an altitudinal gradient from temperate highlands to subtropical coastal regions in eastern South Africa. Podocarpus latifolius is a successful component of temperate highland forest, where it dominates old-growth stages. The success of podocarps is attributed to their greater longevity and ability to regenerate in shade, whereas many potential competing angiosperms are less capable of doing so. Regeneration by P. latifolius and associated angiosperms is less successful in high-light gap environments, where ferns and grasses suppress establishment. Podocarps are rare in coastal scarp forest, where the population is dominated by adult individuals. They are unable to regenerate in very deep shade (<3% daylight), which may account for the lack of P. latifolius regeneration beneath the dense canopy of coastal scarp forest. Low-nutrient soils did not favor podocarps over angiosperms, although the fact that soil nutrients do not appear to be limiting and the scarcity of shade-tolerant angiosperms in forests may influence this outcome. The relative role of light and soils on angiosperm-conifer competition is unknown for lowland forest, although current evidence from montane forests suggests that under prevailing soil conditions, light is the more important axis of niche differentiation.
Keywords Podocarp distribution
Africa


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