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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5262

Title: When is a ‘forest’ a savanna, and why does it matter?
Authors: Ratnam, J
Bond, WJ
Fensham, RJ
Hoffmann, WA
Archibald, S
Lehmann, CER
Anderson, MT
Higgins, SI
Sankaran, M
Keywords: Degraded forests
Fire tolerance
Tropical dry forests
Tropical savannas
Functional traits
Mesic savannas
Shade intolerance
South Asia
Issue Date: Sep-2011
Publisher: Blackwell Publishing
Citation: Ratnam, J, Bond, WJ, Fensham, RJ. 2011. When is a ‘forest’ a savanna, and why does it matter?. Global Ecology and Biogeography, Vol 20(5), pp 653-660
Series/Report no.: Workflow request;7439
Abstract: Savannas are defined based on vegetation structure, the central concept being a discontinuous tree cover in a continuous grass understorey. However, at the high-rainfall end of the tropical savanna biome, where heavily wooded mesic savannas begin to structurally resemble forests, or where tropical forests are degraded such that they open out to structurally resemble savannas, vegetation structure alone may be inadequate to distinguish mesic savanna from forest. Additional knowledge of the functional differences between these ecosystems which contrast sharply in their evolutionary and ecological history is required. Specifically, we suggest that tropical mesic savannas are predominantly mixed tree–C4 grass systems defined by fire tolerance and shade intolerance of their species, while forests, from which C4 grasses are largely absent, have species that are mostly fire intolerant and shade tolerant. Using this framework, we identify a suite of morphological, physiological and life-history traits that are likely to differ between tropical mesic savanna and forest species.We suggest that these traits can be used to distinguish between these ecosystems and thereby aid their appropriate management and conservation. We also suggest that many areas in South Asia classified as tropical dry forests, but characterized by fire-resistant tree species in a C4 grass-dominated understorey, would be better classified as mesic savannas requiring fire and light to maintain the unique mix of species that characterize them.
Description: Copyright: 2011 Blackwell Publishing. ABSTRACT ONLY
URI: http://onlinelibrary.wiley.com/doi/10.1111/j.1466-8238.2010.00634.x/abstract
ISSN: 1466-8238
Appears in Collections:Environmental management
Ecosystems processes & dynamics
General science, engineering & technology

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