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Biogeographical analysis of species of the tribe Cytiseae (Fabaceae) in the Iberian Peninsula and Balearic Islands

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Abstract Aim 

To analyse quantitatively the biogeographical distribution pattern of species of the Cytiseae Bercht. & J. Presl (= Genisteae Benth.) tribe in the Iberian Peninsula and the Balearic Islands, and to identify environmental variables related to the distributional patterns. Location 

Iberian Peninsula and Balearic Islands, using the 61 administrative provinces as operational geographical units. Methods 

In order to identify chorotypes (groups of species with similar geographical distribution), we performed aupgmaclassification based on the similarity index of Baroni-Urbani & Buser. The method of McCoy et al. [Ecology67 (1986), 749] enabled us to detect the significant groups and to differentiate them from those groupings that could be generated at random. Logistic regression analyses and environmental gradient analyses (DCA and CCA) were performed in order to find the relationships between the environmental variables and the observed distributional patterns. Results 

Sixteen chorotypes were obtained between the Cytiseae species of the Iberian Peninsula and the Balearic Islands. The thermal variables showed the greatest influence in species distribution. Specifically, temperatures (maximum, minimum and mean) of the coldest months were associated with the majority of the chorotypes. Main conclusions 

The species of the Cytiseae tribe were not randomly distributed in space, and can be classified in groups of species with common distributional patterns. The importance of cold tolerance in the distribution of these species, as well as their preference for acidic soils, was demonstrated. Certain general tendencies seem to exist with respect to the distribution of the biota in the Iberian Peninsula, and these seem to be independent of the taxonomic groups involved and to be determined by convergent macroclimatic factors.
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Keywords: Balearic Islands; Distribución geográfica; Geographical distribution; Iberian Peninsula; Islas Baleares; Península Ibérica; chorotypes; clasificación; classification; corotipos; environmental variables; variables ambientales

Document Type: Research Article

Affiliations: 1: Departamento de Botánica, Universidad de Concepción, Concepción, Chile 2: Departamento Biologia Vegetal y Ecología, Universidad de Sevilla, Sevilla, Spain

Publication date: 2004-10-01

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