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iForest - Biogeosciences and Forestry

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Clonal structure and dynamics of peripheral Populus tremula L. populations

Dolores Cristóbal (1-2), Pablo Martínez-Zurimendi (2-3)   , Inés Villamediana (1), Josu Ciriza (1), Javier Villar (1), Nikos Nanos (4), Rosario Sierra-de-Grado (1-2)

iForest - Biogeosciences and Forestry, Volume 7, Issue 3, Pages 140-149 (2014)
doi: https://doi.org/10.3832/ifor0971-007
Published: Jan 13, 2014 - Copyright © 2014 SISEF

Research Articles


Native Populus tremula L. populations at the south-western limit of the species’ range are threatened by the anthropic reduction of their habitats and by climate change. In these areas, P. tremula forms small and multiclonal populations. Knowledge of the structures and dynamics of these populations is essential to design effective conservation programs. The clonal spatial and ramet age distributions of three natural populations in north-western Spain were studied. Trees with diameter > 3 cm at breast height were mapped and their age identified. Multilocus genotypes based on 11 isoenzymatic loci were obtained for a sample of 90-106 evenly distributed trees per population. Clonal assignment of the remaining trees in each stand was interpolated using geostatistical methods. All three stands were multiclonal, with higher clonal diversity than that reported in northern populations, and no genotype was detected in more than one stand. Most clones exhibited aggregated distributions, but some scattered clones were also found. The clonal structures of the stands are consistent with the hypothesis that recruitment is absent inside the stand. A combined analysis of ages and genotypes revealed cycles of regrowth in which each clone experienced varying degrees of success in generating new ramets. These degrees of success could be the consequence of varying abilities for vegetative propagation among genotypes. Geostatistical interpolation can be a useful tool for the elaboration of clonal maps, thus reducing the costs of sampling and genotyping, but further research is needed to define the optimum scale of sampling for accurate clonal assignment. For P. tremula conservation programs based on clonal material, small plantations with relatively few clones (approximately 10) provide an appropriate strategy if the metapopulation is maintained at a sufficient level of diversity. The set of clones used for plantations and ex-situ collections should consider both the most abundant and the least frequent clones to avoid a biased selection.

  Keywords


Populus tremula, Clonal Structure, Genetic Diversity, Population Dynamics, Conservation Plans

Authors’ address

(1)
Dolores Cristóbal
Inés Villamediana
Josu Ciriza
Javier Villar
Rosario Sierra-de-Grado
Department of Plant Production and Forest Resources, Universidad de Valladolid, ETSIIAA, Avda. De Madrid 44, 34071 Palencia (Spain)
(2)
Dolores Cristóbal
Pablo Martínez-Zurimendi
Rosario Sierra-de-Grado
Sustainable Forest Management Research Institute UVa-INIA (Spain)
(3)
Pablo Martínez-Zurimendi
ECOSUR, Villahermosa (México)
(4)
Nikos Nanos
Escuela Técnica Superior de Ingenieros de Montes, Universidad Politécnica de Madrid (Spain)

Corresponding author

 
Pablo Martínez-Zurimendi
granzuri@hotmail.com

Citation

Cristóbal D, Martínez-Zurimendi P, Villamediana I, Ciriza J, Villar J, Nanos N, Sierra-de-Grado R (2014). Clonal structure and dynamics of peripheral Populus tremula L. populations. iForest 7: 140-149. - doi: 10.3832/ifor0971-007

Academic Editor

Andrea Piotti

Paper history

Received: Feb 12, 2013
Accepted: Sep 30, 2013

First online: Jan 13, 2014
Publication Date: Jun 02, 2014
Publication Time: 3.50 months

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