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BR Staff Publications --- book reviews

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BR Staff Publications [c] (book chapter or book) --- Belgium --- Quercus --- forest decline

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BR Staff Publications [a] (paper in international, peer reviewed journal) --- Rubiaceae --- galls

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Modelling demography of wild Lima bean (Phaseolus lunatus L.) populations is based firstly on the establishment of the life cycle of their individuals. The presence of a persistent soil seed bank was observed and its dynamics was also integrated to the demographic model. A detailed study of the phenomenon responsible of the germination delays showed the role of the seed-coat dormancy. A generalized matrix model is presented for wild P. lunatus and was tested for five populations in the Central Valley of Costa Rica. Six developmental stages were identified (G1, G2, J, L1, L2 and L3). The determination of vital rates (growth, survival and fecundity) of individuals from these stages allowed to calculate the transition probabilities from one to the other developmental stages after projection intervals of one year. A projection matrix, characteristic of the dynamics of each population, was established and its properties expressed in terms of population growth rate, damping ratio, stable structure, oscillation period and reproductive values. A sensitivity analysis put in evidence the high values of restricted sensitivities associated to populations located in less spoilt sites. This observation revealed a very sensitive growth rate of these populations to perturbations of the life cycle of their individuals. The triangular representation of elasticities linked to growth (eG), stasis (eL) and recruitment of individuals from seeds (eF) illustrates the importance of eG and eF components for populations located in anthropized sites. For populations in the most natural sites eL is the most important component. Conservation strategies that are proposed take into account the degradation level of the site harbouring each population. Projections and simulations from the model confirm the efficiency of recommended management methods in the frame of in situ conservation of wild Lima bean populations in the Central Valley of Costa Rica.

Phaseolus lunatus --- genetic resources --- plant population --- population dynamics --- population structure --- population genetics --- Resource conservation --- Cultivation --- Costa Rica

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BR Staff Publications [b] (paper in not reviewed journal) --- Europe --- Quercus --- dendrology & forestry --- forest decline