Population dynamics and clonal growth of Spartocytisus supranubius (Fabaceae), a dominant shrub in the alpine zone of Tenerife, Canary Islands View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-03-14

AUTHORS

Tomáš Kyncl, Jan Suda, Jan Wild, Radka Wildová, Tomáš Herben

ABSTRACT

Major demographic processes in Spartocytisus supranubius, an endemic shrub dominant in the alpine zone of Tenerife, Canary Islands, were studied by a combination of dendrochronological and demographical techniques. Dendrochronological data were used to estimate growth rates of adult shrubs, frequency of fragmentation of shrubs by clonal growth, mortality, and seedling establishment. Isozymes were used to identify the extent of clonal growth in the species. The data collected were used to construct population projection matrices and to identify the role of generative reproduction vs. clonal growth in the life cycle of the species. Both isozymes and morphological analysis showed that the shrub is capable of clonal growth, but its contribution to the variation in the growth rate is much smaller than that of generative reproduction. The current population dynamics of the shrub seem to be strongly affected by rabbit grazing of seedlings, which controls effective establishment of young shrubs. Analysis of data from enclosures shows that rabbit removal would lead to rapid population growth of the species. Transition matrices showed that Spartocytisus supranubius populations currently are likely decreasing; this contrasts with the rapid increase over the past 40 years shown by historical aerial photographs. The stage structure of the shrub is far from equilibrium, indicating that the dynamics are driven by rare establishment events; dendrochronological analysis identified a peak in regeneration around 1980; this can be attributes to a combination of cessation of management in the caldera and to a series of wet years in that period. More... »

PAGES

97-108

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11258-006-9115-6

DOI

http://dx.doi.org/10.1007/s11258-006-9115-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037246717


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