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

Abstract

Aim To analyse quantitatively the biogeographical distribution pattern of species of the Cytiseae Bercht. & J. Presl (¼ 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 a upgma classification based on the similarity index of Baroni-Urbani & Buser. The method of McCoy et al. [Ecology 67 (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 conclusionsThe 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.

Iberian–Balearic fern regions and their explanatory variables

“…Although some authors have suggested that basic patterns have emerged in Iberian biotic regionalization (Real et al 1996;Gómez-González et al 2004;Arroyo et al 2004), divergence among published proposals still emerges (i.e. Vargas et al 1998;Rivas Martínez and Loidi 2000;García Barros et al 2002).…”

Datura arenicola(Solanaceae): A New Species in the New SectionDiscolafrom Baja California Sur, Mexico

“…This is evident in the relation between D. lanosa and D. wrightii; these 2 taxa are morphologically similar (Luna et al, 2000), genetically related (Palomino et al, 1988;Jiao et al, 2002) and both are distributed in arid northwestern Mexico, even though D. wrightii is more common in the southwestern United States. On the other hand, comparable distribution patterns of taxonomically unrelated species may indicate the occupation of microhabitats within a broad ecological region suggesting their tolerance of certain climatic parameters that results in sympatry of species from different sections (Gómez-González et al, 2004); such as the case of D. inoxia, D. quercifolia, and D. ceratocaula, of sections Dutra, Datura, and Ceratocaulis, respectively (Satina and Avery, 1959;Hammer et al, 1983) that grow together on the Mexican Plateau.…”

“…Endemic species are the result of isolation due to geographical and ecological barriers (Gómez-González et al, 2004); this explanation is appropriate in the case of D. kymatocarpa, a species endemic to the DB province in Guerrero, an inland basin surrounded by the EV and SMS, a site where numerous endemic species from different taxonomic groups have been recorded (Kohlmann and Sánchez, 1984). Also, many endemic taxa in Mexico are concentrated mainly in regions with dry climatic conditions (Rzedowski, 1993); in the case of Datura, this applies to D. lanosa and D. reburra, native to the dry northwestern areas of Mexico.…”

“…ex L., Martínez (1995) for wild bean (Phaseolus L.) taxa, Myklestad and Birks (1993) for Salix L., Francisco-Ortega et al (1994) for Chamaecytisus proliferus (L.Fil.) Link, and Gómez-González et al (2004) for the tribe Cytiseae (Fabaceae).…”

Chorological and phytogeographical diversity of trees and shrubs as a mean to regionalization: Kaczawa Mountains, Sudetes, Poland

“…Less often chorological differentiation of woody flora is taken into consideration (Ojeda & al. 1998;Gómez-González & al. 2004;Kosiński 2005;Abbate & al.…”