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Show simple item record Scogings, PF Hjalten, J Skarpe, C Hattas, D Zobolo, A Dziba, L Rooke, T 2014-07-18T10:04:02Z 2014-07-18T10:04:02Z 2014-01
dc.identifier.citation Scogings, P.F, Hjalten, J, Skarpe, C, Hattas, D, Zobolo, A, Dziba, L and Rooke, T. 2014. Nutrient and secondary metabolite concentrations in a savanna are independently affected by large herbivores and shoot growth rate. Plant Ecology, vol. 215(1), pp 73-83 en_US
dc.identifier.issn 1385-0237
dc.description Copyright: 2014 Springer link. This is an ABSTRACT ONLY. The definitive version is published in Plant Ecology, vol. 215(1), pp 73-82 en_US
dc.description.abstract Carbon-based secondary metabolites (CBSMs) such as tannins are assumed to function as plant defences against herbivores. CBSMs are thought to be inversely related to growth rate and nutrient concentrations because a physiological trade-off exists between cellular growth and differentiation, but CBSM concentrations can be altered by herbivory-induced changes in the trade-off. We predicted that a significant interaction exists between herbivory and growth phase, such that the effects of large herbivores (or their exclusion) on nutrient or CBSM concentrations are greatest during phases of rapid shoot or leaf growth. Leaf samples were collected during phases of different growth rate from six woody species 4 years after establishment of a large-scale long-term herbivore exclusion experiment in Kruger National Park, South Africa. Samples were analysed for N, P, condensed tannins and total phenolics. Interactions between growth phase and herbivores were rare. However, the assumption that elevated nutrients and reduced CBSMs occurs during fast phases of growth was supported by four species (consistent with the growth-differentiation balance hypothesis), but not the other two. Large herbivores generally did not affect nutrients, but CBSMs in four species were reduced by large herbivores other than elephants, while CBSMs in two species were reduced by elephants. Carbon limitation ultimately prevailed among woody plants taller than 2 m under long-term browsing. Large herbivores and plant growth phase are independent and important determinants of nutrients or CBSMs in African savannas, but the effects depend on the interacting assemblages of species, which poses challenges to the application of current general hypotheses of plant defence. en_US
dc.language.iso en en_US
dc.publisher Springer link en_US
dc.relation.ispartofseries Workflow;12489
dc.subject Carbon-based secondary metabolites en_US
dc.subject CBSMs en_US
dc.subject Herbivores en_US
dc.subject Elephants en_US
dc.subject Exclusion experiments en_US
dc.subject Phenology en_US
dc.subject Plant defence en_US
dc.title Nutrient and secondary metabolite concentrations in a savanna are independently affected by large herbivores and shoot growth rate en_US
dc.type Article en_US

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