Contribuiçao para o conhecimento citotaxónomico da flora dos Acores-IV

Queirós, Margarida; Ormonde, José; Nogueira, Isabel

doi:10.24310/abm.v16i.9188

Cited by 1 publication

(3 citation statements)

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“…Species occurrence data were obtained from a collection of references in databases (the Global Biodiversity Information Facility data portal (http://www.gbif.org/; accessed 15 July 2017), the Biodiversity databank of the Canary Islands (http://www.biodiversidadcanarias.es/atlantis/common/index.jsf; accessed 16 June 2013), and the Azores Biodiversity databank (http://www.atlantis.angra. uac.pt/atlantis/common/index.jsf; accessed 1 February 2014), literature [52,89], and our own field records. A total of 323 presence records were finally compiled (Figure 1C).…”

Section: Species Distribution Modellingmentioning

confidence: 99%

“…In order for these populations to increase their genetic diversity and viability sexual reproduction with immigrant genotypes is necessary (something that is highly dependent on the degree of isolation of the population and the time elapsed since its foundation; [104], or that polyploidy events occur which favour the storage of genetic variation via fixed heterozygosity [50,105]. Although we do not have chromosomal data for the populations studied, only those provided by [51] and by [52] for some Madeira and Azores populations respectively, we never found more than two alleles in all individuals genotyped with the microsatellite loci, supporting the diploid nature of the species including the Andalusian populations. These continental populations, with very high homozygosity and very few clonal lineages (contrary to the outcrossing Macaronesian populations), could be examples of colonization from only one or few spores and establishment through selfing and vegetative reproduction.…”

Section: Reproductive System Prevalent In D Caudatummentioning

confidence: 99%

“…Jermy (Athyriaceae), a supposed outcrosser fern distributed across Macaronesia which also occurs disjunctly in the Sierras de Algeciras (Cádiz, southern Iberian Peninsula). Chromosome counts carried out by [51], on Madeira populations, and by [52], on Azores populations, indicate that this is a diploid species (2n = 82). Along with many other Macaronesian pteridophytes, D. caudatum has been supposed to be a Boreotropical remnant resulting from the decrease in temperature at the end of the Tertiary, with subsequent colonisation of the Atlantic islands [15,20,53].…”

Section: Introductionmentioning

confidence: 99%

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Macaronesia Acts as a Museum of Genetic Diversity of Relict Ferns: The Case of Diplazium caudatum (Athyriaceae)

Schuler

Picazo-Aragonés

Rumsey

et al. 2021

Plants

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Macaronesia has been considered a refuge region of the formerly widespread subtropical lauroid flora that lived in Southern Europe during the Tertiary. The study of relict angiosperms has shown that Macaronesian relict taxa preserve genetic variation and revealed general patterns of colonization and dispersal. However, information on the conservation of genetic diversity and range dynamics rapidly diminishes when referring to pteridophytes, despite their dominance of the herbaceous stratum in the European tropical palaeoflora. Here we aim to elucidate the pattern of genetic diversity and phylogeography of Diplazium caudatum, a hypothesized species of the Tertiary Palaeotropical flora and currently with its populations restricted across Macaronesia and disjunctly in the Sierras de Algeciras (Andalusia, southern Iberian Peninsula). We analysed 12 populations across the species range using eight microsatellite loci, sequences of a region of plastid DNA, and carry out species-distribution modelling analyses. Our dating results confirm the Tertiary origin of this species. The Macaronesian archipelagos served as a refuge during at least the Quaternary glacial cycles, where populations of D. caudatum preserved higher levels of genetic variation than mainland populations. Our data suggest the disappearance of the species in the continent and the subsequent recolonization from Macaronesia. The results of the AMOVA analysis and the indices of clonal diversity and linkage disequilibrium suggest that D. caudatum is a species in which inter-gametophytic outcrossing predominates, and that in the Andalusian populations there was a shift in mating system toward increased inbreeding and/or clonality. The model that best explains the genetic diversity distribution pattern observed in Macaronesia is, the initial and recurrent colonization between islands and archipelagos and the relatively recent diversification of restricted area lineages, probably due to the decrease of favorable habitats and competition with lineages previously established. This study extends to ferns the concept of Macaronesia archipelagos as refugia for genetic variation.

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Section: Species Distribution Modellingmentioning

confidence: 99%