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Demography and life history of two rattan species, Eremospatha macrocarpa and Laccosperma secundiflorum, in Côte d'Ivoire

Published online by Cambridge University Press:  01 September 2008

Kouadio I. Kouassi ,
Sébastien Barot ,
Jacques Gignoux  and
Irié A. Zoro Bi
Kouadio I. Kouassi*
Affiliation:
Université d'Abobo-Adjamé, UFR des Sciences de la Nature, 02 BP 801 Abidjan 02, Côte d'Ivoire Laboratoire d'Ecologie des Sols Tropicaux (LEST), UMR 137, IRD, 32 Avenue Henri Varagnat, 93143, Bondy, France
Sébastien Barot
Affiliation:
Laboratoire d'Ecologie des Sols Tropicaux (LEST), UMR 137, IRD, 32 Avenue Henri Varagnat, 93143, Bondy, France
Jacques Gignoux
Affiliation:
Laboratoire de Biochimie et Ecologie des Milieux Continentaux (Biodiversité et fonctionnement des Ecosystèmes), ENS, 46 rue d'Ulm 75230 Paris Cedex 05
Irié A. Zoro Bi
Affiliation:
Université d'Abobo-Adjamé, UFR des Sciences de la Nature, 02 BP 801 Abidjan 02, Côte d'Ivoire
*
1Corresponding author. Email: [email protected]
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Abstract:

Two rattans species were studied in Côte d'Ivoire using a stage-classified matrix model to compare their demography and life histories. Respectively 854 and 1009 genets of Eremospatha macrocarpa (pleonanthic) and Laccosperma secundiflorum (hapaxanthic) were censused every 6 mo over 18 mo. The population growth rates of E. macrocarpa (λ = 0.979) and L. secundiflorum (λ = 0.959) were not significantly different from 1. This indicates that the populations were close to equilibrium. However, the difference between the stable stage distributions and the observed distributions indicated temporal variation in vital rates. Elasticity analysis showed that growth and fecundity had lower contributions to λ than the survival rates for the two species. A Life Table Response Experiment revealed that the survival of the first juvenile stage (all stems < 6 m in length), fecundity, growth of the second juvenile stage (at least one stem > 6 m in length) and adult (reproductive) survival highly contribute to the differences between the demography of the two species. Reproduction is postponed longer for L. secundiflorum than for E. macrocarpa and the mean remaining life span for adult genets is shorter for L. secundiflorum than for E. macrocarpa. Finally, our results suggest the existence of two trade-offs within reproduction which suggest that, although the two species have different demographic features, the λ of their populations are not significantly different from 1.

Keywords

age estimationelasticitylife-table response experimentsnon-timber forest productspalmpopulation growth ratestage-classified matrix modeltropical forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 24 , Issue 5 , September 2008 , pp. 493 - 503
Copyright
Copyright © Cambridge University Press 2008

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