3 results on '"Dimitriou, Andreas"'
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2. Revisiting the saproxylic beetle 'Propomacrus cypriacus Alexis & Makris, 2002' (Coleoptera: Euchiridae) using molecular, morphological and ecological data
- Author
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Sfenthourakis, Spyros, Hadjiconstantis, M., Makris, Constantinos, Dimitriou, Andreas C., and Sfenthourakis, Spyros [0000-0003-3213-2502]
- Subjects
0106 biological sciences ,0301 basic medicine ,Systematics ,Mitochondrial DNA ,Cladochronology ,Morphology (biology) ,Biology ,phylogeny ,host trees ,010603 evolutionary biology ,01 natural sciences ,03 medical and health sciences ,Critically endangered ,Phylogenetics ,Genetic variation ,IUCN Red List ,systematics ,Ecology, Evolution, Behavior and Systematics ,Taxonomy ,Phylogenetic tree ,Ecology ,Biodiversity ,humanities ,Coleoptera ,030104 developmental biology ,Evolutionary biology ,Cyprus ,species status - Abstract
Propomacrus cypriacus a saproxylic beetle endemic to Cyprus, was described as a species distinct from P. bimucronatus on the basis of a few morphological characters and has been evaluated as Critically Endangered by IUCN, as it depends on veteran trees and has a restricted distribution. Herein we explored the distribution, ecology, morphology and genetic variation of the populations from Cyprus, and we attempted a phylogenetic analysis including related species based on two mitochondrial and one nuclear DNA markers. We also used published mtDNA divergence rates to date cladogenetic events. Despite extensive sampling, we found only a small number of individuals, adding a few additional localities to the known distribution of the species, and we identified two more host species to those previously reported. Morphological examination showed that only the form of male protibiae differs consistently in Cyprus populations compared to those of P. bimucronatus from Turkey and the Lebanon. Nevertheless, genetic analyses do not support a distinct species status for populations from Cyprus, which should instead be considered as a subspecies of P. bimucronatus. Morphological and ecological data further support this conclusion. Cyprus populations have diverged from nearby continental ones in mid to late Pleistocene. © 2017 Informa UK Limited, trading as Taylor & Francis Group. 51 1021 1034
- Published
- 2017
3. Diversification within an oceanic Mediterranean island: Insights from a terrestrial isopod.
- Author
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Dimitriou, Andreas C., Antoniou, Aglaia, Alexiou, Ioannis, Poulakakis, Nikos, Parmakelis, Aristeidis, and Sfenthourakis, Spyros
- Subjects
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DISCRETE groups , *ISLANDS , *BIOLOGICAL evolution , *GENE flow , *SPECIES diversity ,REPRODUCTIVE isolation - Abstract
[Display omitted] • Six genetically discrete A. officinalis groups across the study area were identified, four of which endemic to the island of Cyprus. • MSC facilitated the arrival of the species on the island. • Species delimitation supports the existence of at least three species, two of which new for science, one endemic to Cyprus, one in Israel, and one corresponding to the nominal species. • Cryptic diversity has been revealed, not reflected in morphology. • Geological history coupled with recent human activities have shaped observed diversity patterns. Understanding intra-island patterns of evolutionary divergence, including cases of cryptic diversity, is a crucial step towards deciphering speciation processes. Cyprus is an oceanic island isolated for at least 5.3 Mya from surrounding continental regions, while it remains unclear whether it was ever connected to the mainland, even during the Messinian Salinity Crisis. The terrestrial isopod species Armadillo officinalis , that is widespread across the Mediterranean, offers the opportunity to explore intra-island divergence patterns that might exhibit geographical structure related also to the region's known paleogeography. Genome-wide ddRADseq, as well as Sanger sequencing for four mitochondrial and three nuclear loci data were generated for this purpose. In total, 71 populations from Cyprus, neighbouring continental sites, i.e., Israel, Lebanon and Turkey, and other Mediterranean regions, i.e. Greece, Italy, and Tunisia, were included in the analysis. Phylogenetic reconstructions and population structure analyses support the existence of at least six genetically discrete groups across the study area. Five of these distinct genetic clades occur on Cyprus, four of which are endemic to the island and one is widely distributed along the circum-Mediterranean countries. The sixth clade is distributed in Israel. The closest evolutionary relationship of endemic Cypriot populations is with those from Israel, while the evolutionary clade that is present in countries all around the Mediterranean is very shallow. Cladochronological analyses date the origin of the species on the island at ∼6 Mya. Estimated f4 and D statistics as well as F ST values indicate the genetic isolation between the populations sampled from Cyprus and surrounding continental areas, while there is evident gene flow among populations within the island. Species delimitation and population genetic metrics support the existence of three distinct taxonomic units across the study area, two of which occur on the island and correspond to the endemic clade and the widespread circum-Mediterranean one, respectively, while the third corresponds to Israel's clade. The islands' paleogeographic history and recent human activities seem to have shaped current patterns of genetic diversity in this group of species. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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