caa a22 4500 477038484 CHVBK 20180405111310.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00983379 doi (NATIONALLICENCE)springer-10.1007/BF00983379 Isozyme differentiation in the endemic genus Argyranthemum ( Asteraceae: Anthemideae ) in the Macaronesian Islands [Elektronische Daten] [Javier Francisco-Ortega, Daniel Crawford, Arnoldo Santos-Guerra, Jose Carvalho] The genusArgyranthemum (Asteraceae: Anthemideae) comprises 38 taxa and is restricted to the archipelagos of the Canaries, Selvagens, Madeira, and Desertas in the Macaronesian biogeographic region. An electrophoretic study, including 17 enzyme loci and at least one population of each of the described taxa, was carried out. High identity (low distance) values between taxa (mean of 0.893) were obtained despite the old age of the islands, their close proximity to the African continent, and the fact thatArgyranthemum is the most species-rich and variable genus in Macaronesia. These results suggest that the genus is monophyletic and that it has evolved very rapidly in these islands. There is little correspondence between taxonomy and neighbor-joining analysis based on Roger's genetic distances, but in several instances populations from the same islands cluster together despite being from different species or even different sections. It is suggested that repeated genetic bottlenecks associated with the founding of new populations during radiation of the genus resulted in lineage sorting of ancestral allozyme polymorphisms. Because every population has a high average identity with all other populations, lineage sorting could result in populations of different taxa being slightly more similar than populations of the same taxon. Gene flow between different species on the same island could account for some populations clustering by island of origin rather than taxonomic disposition. Average allozyme diversity within populations (0.098) is 50% higher than the mean total diversity for species endemic to oceanic islands. Springer-Verlag, 1996 Asteraceae nationallicence Argyranthemum nationallicence Oceanic Islands nationallicence isozymes nationallicence Francisco-Ortega Javier Department of Botany, University of Texas, 78713-7640, Austin, Texas, USA aut Crawford Daniel Department of Plant Biology, The Ohio State University, 43210-1293, Columbus, Ohio, USA aut Santos-Guerra Arnoldo Jardín de Aclimatación de La Orotava, Calle Retama Num. 2, E-38400, Puerto de La Cruz, Tenerife, Canary Islands, Spain aut Carvalho Jose Jardim Botânico da Madeira, Caminho do Meio, Bom Sucesso, 9000, Funchal, Madeira, Portugal aut Plant Systematics and Evolution Springer-Verlag 202/3-4(1996-09-01), 137-152 0378-2697 202:3-4<137 1996 202 606 https://doi.org/10.1007/BF00983379 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00983379 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Francisco-Ortega Javier Department of Botany, University of Texas, 78713-7640, Austin, Texas, USA aut NATIONALLICENCE 700 1- Crawford Daniel Department of Plant Biology, The Ohio State University, 43210-1293, Columbus, Ohio, USA aut NATIONALLICENCE 700 1- Santos-Guerra Arnoldo Jardín de Aclimatación de La Orotava, Calle Retama Num. 2, E-38400, Puerto de La Cruz, Tenerife, Canary Islands, Spain aut NATIONALLICENCE 700 1- Carvalho Jose Jardim Botânico da Madeira, Caminho do Meio, Bom Sucesso, 9000, Funchal, Madeira, Portugal aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 202/3-4(1996-09-01), 137-152 0378-2697 202:3-4<137 1996 202 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer