| population genetic structure and colonization sequence of drosophila subobscura in the canaries and madeira atlantic islands as inferred by autosomal, sex-linked and mtdna traits. | the genetic structure in atlantic islands and continental populations of drosophila subobscura has been studied using autosomal and sex-linked allozymes and mitochondrial dna (mtdna) haplotypes. from the data it is deduced that whereas the canary islands have long been isolated, the neighboring island of madeira has been subjected to continuous migration from the mainland. in addition, sex-linked allozymes and mtdna data show a large divergence between the geologically younger western islands of ... | 1997 | 9099006 |
| the colonization history of olea europaea l. in macaronesia based on internal transcribed spacer 1 (its-1) sequences, randomly amplified polymorphic dnas (rapd), and intersimple sequence repeats (issr). | phylogenetic relationships in the olea europaea complex and the phylogeography of 24 populations of the macaronesian olive (o. europaea ssp. cerasiformis) were assessed by using three molecular markers: nuclear ribosomal internal transcribed spacer 1 (its-1) sequences, randomly amplified polymorphic dnas (rapd), and intersimple sequence repeats (issr). parsimony analysis of the its-1 sequences and neighbour-joining (nj) analyses of rapd and issr banding variation revealed four major lineages in ... | 2000 | 10886649 |
| interpreting colonization of the calathus (coleoptera: carabidae) on the canary islands and madeira through the application of the parametric bootstrap. | the canary islands have proven to be an interesting archipelago for the phylogeographic study of colonization and diversification with a number of recent studies reporting evolutionary patterns and processes across a diversity of floral and faunal groups. the canary islands differ from the hawaiian and galapagos islands by their close proximity to a continental land mass, being 110 km from the northwestern coast of africa. this close proximity to a continent obviously increases the potential for ... | 2000 | 11209784 |
| origin of macaronesian sideritis l. (lamioideae: lamiaceae) inferred from nuclear and chloroplast sequence datasets. | sideritis l. (lamiaceae) comprises approximately 150 species of annuals and perennials distributed chiefly in the mediterranean region. the majority of the species belong to the continental subgenus sideritis which is divided into two perennial (sideritis and empedoclea) and two annual (hesiodia and burgsdorfia) sections. twenty-three species are woody perennials endemic to the macaronesian archipelagos of madeira and the canary islands. in an effort to determine the continental origin of the in ... | 2002 | 12099789 |
| mitochondrial dna phylogeography and population history of meladema diving beetles on the atlantic islands and in the mediterranean basin (coleoptera, dytiscidae). | the phylogeny and population history of meladema diving beetles (coleoptera, dytiscidae) were examined using mitochondrial dna sequence from 16s ribosomal rna and cytochrome oxidase i genes in 51 individuals from 22 populations of the three extant species (m. imbricata endemic to the western canary islands, m. lanio endemic to madeira and m. coriacea widespread in the western mediterranean and on the western canaries), using a combination of phylogenetic and nested clade analyses. four main line ... | 2003 | 12492885 |
| population genetics of ochlerotatus eatoni (diptera: culicidae) endemic species to two macaronesian islands. | analyses of 11 isoenzyme loci of ochlerotatus eatoni (edwards, 1916), endemic to two macaronesian islands (madeira and tenerife, canary islands), revealed substantial genetic structure in the study populations. samples from sites on the south and north of madeira displayed a significant reduction of variability compared with those from central madeira and tenerife. the tenerife population exhibited a severe deficit of heterozygosity with similar magnitude across all the loci examined. the comple ... | 2006 | 16619604 |
| the peopling of madeira archipelago (portugal) according to hla genes. | the madeira-porto santo archipelago was officially colonized in 1420 by portuguese settlers. its importance in columbus' information for the american discovery and for slave traffic across the atlantic is unquestionable. thus, a complex peopling may have given rise to a present-day high admixture of ethnicities according to hla genes. a sample of 173 healthy unrelated madeirans was analysed and compared with 6986 hla chromosomes from other worldwide populations. genetic distances, neighbour-join ... | 2009 | 19055604 |
| delta6-desaturase sequence evidence for explosive pliocene radiations within the adaptive radiation of macaronesian echium (boraginaceae). | the oceanic islands of macaronesia provide an ideal temporal and spatial context to test hypotheses of plant evolution using a novel set of phylogenetic markers, delta(6)-desaturase sequences. in contrast to the limited resolution of standard molecular markers (nrdna and plastid sequences), the delta(6)-desaturase sequence phylogeny of echium unequivocally reconstructs its active colonization across islands and archipelagos (madeira, the canary islands, and cape verde), as well as its subsequent ... | 2009 | 19398027 |
| mitochondrial dna patterns in the macaronesia islands: variation within and among archipelagos. | macaronesia covers four atlantic archipelagos: the azores, madeira, the canary islands, and the cape verde islands. when discovered by europeans in the 15th century, only the canaries were inhabited. historical reports highlight the impact of iberians on settlement in macaronesia. although important differences in their settlement are documented, its influence on their genetic structures and relationships has yet to be ascertained. in this study, the hypervariable region i (hvri) sequence and co ... | 2010 | 19927277 |
| Oceanic islands are not sinks of biodiversity in spore-producing plants. | Islands have traditionally been considered as migratory and evolutionary dead ends for two main reasons: island colonizers are typically assumed to lose their dispersal power, and continental back colonization has been regarded as unlikely because of niche preemption. The hypothesis that islands might actually represent dynamic refugia and migratory stepping stones for species that are effective dispersers, and in particular, for spore-producing plants, is formally tested here, using the archipe ... | 2011 | 22084108 |