Consulta: subjectFacets:"Phylogenetics"
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Data/hora: 07/06/2024 03:42:26

Evidence that the Ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the Brazilian Atlantic Forest agroecosystem are two distinct phylospecies
Provedor de dados: 74
Autores: Ceresini,Paulo C.; Costa-Souza,Elaine; Zala,Marcello; Furtado,Edson L.; Souza,Nilton L.
The white-thread blight and black rot (WTBR) caused by basidiomycetous fungi of the genus Ceratobasidium is emerging as an important plant disease in Brazil, particularly for crop species in the Ericales such as persimmon (Diospyros kaki) and tea (Camellia sinensis). However, the species identity of the fungal pathogen associated with either of these hosts is still unclear. In this work, we used sequence variation in the internal transcribed spacer regions, including the 5.8S coding region of rDNA (ITS-5.8S rDNA), to determine the phylogenetic placement of the local white-thread-blight-associated populations of Ceratobasidium sp. from persimmon and tea, in relation to Ceratobasidium species already described world-wide. The two sister populations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological speciation; Fungal plant pathogens; Host specialization; Population divergence; Phylogenetics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300016

A test of the utility of DNA barcoding in the radiation of the freshwater stingray genus Potamotrygon (Potamotrygonidae, Myliobatiformes)
Provedor de dados: 74
Autores: Toffoli,Daniel; Hrbek,Tomas; Araújo,Maria Lúcia Góes de; Almeida,Maurício Pinto de; Charvet-Almeida,Patricia; Farias,Izeni Pires.
DNA barcoding is a recently proposed global standard in taxonomy based on DNA sequences. The two main goals of DNA barcoding methodology are assignment of specimens to a species and discovery of new species. There are two main underlying assumptions: i) reciprocal monophyly of species, and ii) intraspecific divergence is always less than interspecific divergence. Here we present a phylogenetic analysis of the family Potamotrygonidae based on mitochondrial cytochrome c oxidase I gene, sampling 10 out of the 18 to 20 valid species including two non-described species. Potamotrygonidae systematics is still not fully resolved with several still-to-be-described species while some other species are difficult to delimit due to overlap in morphological characters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potamotrygon; Barcoding; Radiation; Phylogenetics; COI; MtDNA.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200028

Phylogenomic and single nucleotide polymorphism analyses revealed the hybrid origin of Spondias bahiensis (family Anacardiaceae): de novo genome sequencing and comparative genomics
Provedor de dados: 74
Autores: Nobre,Lydayanne Lilás de Melo; Santos,José Daniel Oliveira dos; Leite,Rychard; Almeida,Cícero.
Abstract The genus Spondias (family Anacardiaceae) comprises 19 taxa, ten of which occur in Neotropical regions. Spondias bahiensis has been suggested to be a hybrid, although initial evidence does not support this hypothesis. The aim of this study was to test the hypothesis of the hybrid origin of S. bahiensis using high-throughput sequencing with single nucleotide polymorphism (SNP) analysis, characterization of intragenomic nuclear ribosomal DNA (nrDNA), and nuclear and chloroplast phylogenomic analyses. The SNP analysis revealed a high number of SNPs in the S. bahiensis genome, and with respect to nrDNA, S. bahiensis shared approximately half of the SNP alleles with S. tuberosa, but not with S. mombin. Combining the SNP analysis with nrDNA phylogeny...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RDNA; Phylogenetics; Evolution; Hybrid offspring.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000500878

The enigmatic monotypic crab plover Dromas ardeola is closely related to pratincoles and coursers (Aves, Charadriiformes, Glareolidae)
Provedor de dados: 74
Autores: Pereira,Sergio L.; Baker,Allan J.
The phylogenetic placement of the monotypic crab plover Dromas ardeola (Aves, Charadriiformes) remains controversial. Phylogenetic analysis of anatomical and behavioral traits using phenetic and cladistic methods of tree inference have resulted in conflicting tree topologies, suggesting a close association of Dromas to members of different suborders and lineages within Charadriiformes. Here, we revisited the issue by applying Bayesian and parsimony methods of tree inference to 2,012 anatomical and 5,183 molecular characters to a set of 22 shorebird genera (including Turnix). Our results suggest that Bayesian analysis of anatomical characters does not resolve the phylogenetic relationship of shorebirds with strong statistical support. In contrast, Bayesian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dromas; Charadriiformes; Bayesian tree inference; Phylogenetics; Systematics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300033

Systematics and phylogeny of the caryophyllidia-bearing dorids (Mollusca, Nudibranchia), with descriptions of a new genus and four new species from Indo-Pacific deep waters
Provedor de dados: 5
Autores: Valdes, A; Gosliner, Tm.
The phylogenetic relationships of the caryophyllidia-bearing dorids are studied, based on the examination of the type species of all the genera previously described. The phylogenetic hypothesis supports that the caryophyllidia-bearing dorids area monophyletic group and the sister group of the clade formed by Asteronotus Ehrenberg, 1831 and Halgerda Bergh, 1880. Several genera previously considered as valid or regarded as uncertain are here synonymized: Peronodoris Bergh, 1904, Trippa Bergh, 1877, Phlegmodoris Bergh, 1878, Petelodoris Bergh, 1881, Kentrodoris Bergh, 1876, Audura Bergh, 1878, Centrodoris P. Fischer, 1883, Anisodoris Bergh, 1898, Awuka Er. Marcus, 1955, Rhabdochila P Fischer, 1883, Boreodoris Odhner, 1939, Dictyodoris Bergh, 1880, Gravieria...
Tipo: Text
Palavras-chave: Mollusca; Nudibranchia; Doridoidea; Caryophyllidia; Phylogenetics; Systematics; Nomenclature; New genera; New species.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00288/39932/38517.pdf

Bonamia parasites: a rapidly changing perspective on a genus of important mollusc pathogens
Provedor de dados: 5
Autores: Engelsma, Marc; Culloty, Sarah C.; Lynch, Sharon A.; Arzul, Isabelle; Carnegie, Ryan B.
Organisms of the genus Bonamia are intracellular protistan parasites of oysters. To date, 4 species have been described (B. ostreae, B. exitiosa, B. perspora and B. roughleyi), al though the status of B. roughleyi is controversial. Introduction especially of B. ostreae and B. exitiosa to naïve host populations has been shown to cause mass mortalities in the past and has had a dramatic impact on oyster production. Both B. ostreae and B. exitiosa are pathogens notifiable to the World Organisation for Animal Health (OIE) and the European Union. Effective management of the disease caused by these pathogens is complicated by the extensive nature of the oyster production process and limited options for disease control of the cultured stocks in open water. This...
Tipo: Text
Palavras-chave: Bonamia ostreae; Bonamia exitiosa; Oyster disease; Phylogenetics; Geographical spread; Diagnostics; Epizootiology; Host-parasite interaction; Bonamiosis.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00200/31169/29568.pdf

Phylogeography of the reef-building polychaetes of the genus     Phragmatopoma     in the western Atlantic Region
Provedor de dados: 5
Autores: Nunes, Flavia; Van Wormhoudt, Alain; Faroni-perez, Larisse; Fournier, Jerome.
Aim  To verify the synonymy of the reef-building polychaete Phragmatopoma caudata (described for the Caribbean) and Phragmatopoma lapidosa (described for Brazil) using molecular data. To evaluate the patterns of genetic diversity and connectivity among populations from Florida to South Brazil. Location  Intertidal zone in the western Atlantic biogeographical Region: Brazil, eastern Caribbean and Florida (USA). Methods  DNA sequence data from one mitochondrial (cox-1) and one nuclear ribosomal (ITS-1) loci were obtained from 11 populations of P. caudata spanning the coasts of Brazil, eastern Caribbean and Florida. Phylogenetic relationships among populations of P. caudata and other members of the genus were inferred by Bayesian methods. Population...
Tipo: Text
Palavras-chave: Biogeographical barrier; Brazilian Province; Caribbean Province; Connectivity; Larval dispersal; Phragmatopoma caudata; Phylogenetics; Phylogeography; Polychaete reef; Western Atlantic Region.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00363/47376/47710.pdf

A distinctive new cloud-forest rodent (Hystricognathi: Echimyidae) from the Manu Biosphere Reserve, Peru
Provedor de dados: 81
Autores: Patterson,Bruce D.; Velazco,Paul M.
Recent surveys in Peru 's Manu National Park and Biosphere Reserve uncovered a new species of hystricognath rodent, a spiny rat (Echimyidae) with dense, soft fur. Inhabiting Andean cloud-forests at 1900 m, the new rodent belongs to a radiation of "brush-tailed tree rats" previously known only from the Amazon, Orinoco, and other lowland river drainages. Phylogenetic analysis of morphology (cranial and dental characters) unambiguously allies the new species with species of Isothrix. While the inclusion of the new taxon does not resolve the "star phylogeny" which underlies the echimyid radiation, it identifies the Andes as a possible theatre for the evolution of some soft-haired members of the group. The new species is described and a revised diagnosis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andes; Morphology; Phylogenetics; Species description; Systematics.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832006000200002

A Molecular Perspective On The Diversification Of Short-Tailed Opossums (Monodelphis: Didelphidae)
Provedor de dados: 81
Autores: Solari,Sergio.
As currently understood Monodelphis includes more than 22 species and is the most diverse genus of opossums (Didelphimorphia). No complete evaluation of the systematic relationships of its species has been attempted, despite the fact that several species groups and even genus-level groups have been proposed based on morphology, and that some of them are limited to recognized biogeographic regions. Here, genealogic relationships among 17 species were assessed based on phylogenetic analyses of 60 individual sequences (801 base pairs of the mitochondrial cytochrome b gene). The analyses cast doubts on the monophyly of Monodelphis, but species were consistently discriminated into eight species groups: (a) brevicaudata group, with five species, (b) adusta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Didelphimorphia; Phylogenetics; Species limits; Taxonomy.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000200007

Phylogeny and biogeography of midwife toads (Alytes, Discoglossidae): a rebuttal
Provedor de dados: 16
Autores: Arntzen, J.W.; García-París, M.
Three competing phylogenetic hypotheses for the genus Alytes (midwife toads) are evaluated. Based on quantitative coding of protein characters the most parsimonious solution shows a sister taxon relationship for Alytes dickhilleni and A. muletensis. The alternatives in which A. obstetricans has its sister group in either A. dickhilleni or A. muletensis lack support. Using calibrations derived from protein evolutionary rates, the vicariant events giving rise to A. obstetricans and the lineage leading to the A. muletensis and A. dickhilleni clade and the subsequent splitting between A. muletensis and A. dickhilleni cannot be placed much earlier than the Miocene-Pliocene boundary. Biogeographical scenarios invoking an earlier time of divergence should be...
Tipo: Article / Letter to the editor
Palavras-chave: Allozymes; Alytes; Biogeography; Midwife toads; Phylogenetics; Spain; Taxonomy; Vicariance.
Ano: 1997
URL: http://www.repository.naturalis.nl/record/504096

A taxonomic, phylogenetic and biogeographic study of the genus Acanthophora (Rhodomelaceae, Rhodophyta)
Provedor de dados: 16
Autores: Jong, Yde S.D.M. de; Hitipeuw, Creusa; Prud’homme van Reine, Willem F.
A cladistic analysis, based on a taxonomic revision is carried out for 7 Acanthophora species using 19 characters. Hypotheses on species affinities are based primarily on morphological characters. Because most species show only few distinctive characters, emphasis was placed on features of spine development, either in relation to vegetative or to reproductive structures. Global distribution of 7 Acanthophora species: viz. A. aokii, A. dendroides, A. muscoides, A. nayadiformis, A. pacifica, A. ramulosa, and A. spicifera, shows a discontinuous pattern. Although widely distributed species are present (A. muscoides and A. spicifera), a disjunct distribution of other species occurs in the Pacific (A. aokii), Indian Ocean (A. dendroides), East-Atlantic region...
Tipo: Article / Letter to the editor
Palavras-chave: Rhodomelaceae; Rhodophyta; Biogeography; Phylogenetics; Seaweeds; Taxonomy.
Ano: 1999
URL: http://www.repository.naturalis.nl/record/525490

Generic revision of the superfamily Pterophoroidea (Lepidoptera)
Provedor de dados: 16
Autores: Gielis, C.
The genera of the superfamily Pterophoroidea are redescribed. Three new genera are described: Dejongia, Stockophorus and Shafferia. The characters of the genera and their states are translated into a data matrix. A majority rule consensus tree composed with PAUP serves as a basis for a phylogenetic analysis. A cladogram, representing the views of the author, based on the data acquired, is presented with argumentation. The evaluation of the characters is discussed. A new subfamily is erected, the Deuterocopinae. The Pterophorinae are redefined. The Platyptiliinae are synonymized with the Pterophorinae. The Macropiratidae, considered by Minet (1991) a subfamily or a genus of the Pterophoridae, has been raised to family rank, and is placed as the sister group...
Tipo: Article / Letter to the editor
Palavras-chave: Pterophoroidea; Pterophoridae; Macropiratidae; Revision; Phylogenetics; Biogeography; Checklist.; 42.75.
Ano: 1993
URL: http://www.repository.naturalis.nl/record/317793

Genetic and morphological variation in corallivorous snails (Coralliophila spp.) living on different host corals at Curaçao, southern Caribbean
Provedor de dados: 16
Autores: Potkamp, G.; Vermeij, M.J.A.; Hoeksema, B.W.
Snails of the genus Coralliophila (Muricidae: Coralliophilinae) are common corallivores in the Caribbean, feeding on a wide range of host species. In the present study, the morphological and genetic variation in C. galea and C. caribaea were studied in relation to their association with host coral species at Curaçao. Differences in shell shape among snails living on different hosts were quantified using geometric morphometric and phylogenetic relationships were studied using two mitochondrial markers (12S and COI). Based on these analyses, a new species, C. curacaoensis sp. nov., was found in association with the scleractinian coral Madracis auretenra. Both C. galea and C. caribaea showed host-specific differences in shell shape, size, and shell allometry...
Tipo: Article / Letter to the editor
Palavras-chave: Genetic differentiation; Phylogenetics; 12S; COI; Corallivory; Morphology; Geometric morphometrics; Host race.
Ano: 2017
URL: http://www.repository.naturalis.nl/record/630190

Integrative taxonomy reveals an unexpected diversity in Geastrum section Geastrum (Geastrales, Basidiomycota)
Provedor de dados: 16
Autores: Zamora, J.C.; Calonge, F.D.; Martín, M.P.
A revision of the classification of Geastrum sect. Geastrum is presented on the basis of an integrative taxonomic approach, which involves the study of morphological, molecular, ecological, and chorological data. Four DNA regions are analysed: the ITS and LSU nrDNA, rpb1, and atp6. Phylogenetic reconstructions include 95 ingroup samples and show five main clades, which are considered as five subsections, one of them proposed as new (G. subsect. Hungarica), and a total of 27 lineages recognizable at species level. Discriminant function analyses, ANOVAs and Tukey’s HSD tests on more than 500 basidiomata reveal the utility of several quantitative morphological characters for species delimitation. As a result of the combination of the different sources of...
Tipo: Article / Letter to the editor
Palavras-chave: Chorology; Ecology; Geastraceae; Morphology; Phylogenetics; Species delimitation.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/560059

Generic circumscriptions in Geoglossomycetes
Provedor de dados: 16
Autores: Hustad, V.P.; Miller, A.N.; Dentinger, B.T.M.; Cannon, P.F.
The class Geoglossomycetes is a recently created class of Ascomycota, currently comprised of one family (Geoglossaceae) and five genera (Geoglossum, Nothomitra, Sarcoleotia, Thuemenidium and Trichoglossum). These fungi, commonly known as earth tongues, have long been a subject of mycological research. However, the taxonomy within the group has historically been hindered by the lack of reliable morphological characters, uncertain ecological associations, and the inability to grow these fungi in culture. The phylogenetic relationships of Geoglossomycetes were investigated by conducting maximum likelihood and Bayesian analyses using a 4-gene dataset (ITS, LSU, MCM7, RPB1). Five well-supported monophyletic clades were found that did not correspond exactly with...
Tipo: Article / Letter to the editor
Palavras-chave: Ascomycota; Earth tongues; Geoglossum; Microglossum; Phylogenetics; Systematics.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/532273

Molecular systematics of Barbatosphaeria (Sordariomycetes): multigene phylogeny and secondary ITS structure
Provedor de dados: 16
Autores: Réblová, M.; Réblová, K.; Štěpánek, V.
Thirteen morphologically similar strains of barbatosphaeria- and tectonidula-like fungi were studied based on the comparison of cultural and morphological features of sexual and asexual morphs and phylogenetic analyses of ﬁve nuclear loci, i.e. internal transcribed spacer rDNA operon (ITS), large and small subunit nuclear ribosomal DNA, β-tubulin, and second largest subunit of RNA polymerase II. Phylogenetic results were supported by in-depth comparative analyses of common core secondary structure of ITS1 and ITS2 in all strains and the identiﬁcation of non-conserved, co-evolving nucleotides that maintain base pairing in the RNA transcript. Barbatosphaeria is deﬁned as a well-supported monophyletic clade comprising several lineages and is placed in the...
Tipo: Article / Letter to the editor
Palavras-chave: Phylogenetics; Ramichloridium; Sequence analysis; Spacer regions; Sporothrix; Tectonidula.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/588698

A large phylogeny of turtles (Testudines) using molecular data
Provedor de dados: 16
Autores: Guillon, J.-M.; Guéry, L.; Hulin, V.; Girondot, M.
Turtles (Testudines) form a monophyletic group with a highly distinctive body plan. The taxonomy and phylogeny of turtles are still under discussion, at least for some clades. Whereas in most previous studies, only a few species or genera were considered, we here use an extensive compilation of DNA sequences from nuclear and mitochondrial genes for more than two thirds of the total number of turtle species to infer a large phylogeny for this taxon. Our results enable us to discuss previous hypotheses on species phylogeny or taxonomy. We are thus able to discriminate between competing hypotheses and to suggest taxonomical modifications. Finally, we pinpoint the remaining ambiguities for this phylogeny and the species for which new sequences should be...
Tipo: Article / Letter to the editor
Palavras-chave: MtDNA sequence; NuDNA sequence; Phylogenetics; Reptilia; Taxonomy; 42.82.
Ano: 2012
URL: http://www.repository.naturalis.nl/record/421559

Wolbachia screening in spiders and assessment of horizontal transmission between predator and prey
Provedor de dados: 82
Autores: Yun,Y; Peng,Y; Liu,FX; Lei,C.
Recent studies have revealed that the prevalence of Wolbachia in arthropods is attributable not only to its vertical transmission, but also to its horizontal transfer. In order to assess the horizontal transmission of Wolbachia between predator and prey, arthropods belonging to 11 spider families and six insect families were collected in the same field of rice. The distribution of Wolbachia in these arthropods was detected by diagnostic PCR amplification of the wsp (Wolbachia outer surface protein gene) and 16S rDNA genes. Nurscia albofasciata Strand (Araneae: Titanoecidae), Propylea japonica Thunberg (Coleoptera: Coccinellidae), Paederus fuscipes Curtis (Coleoptera: Staphylinidae), and Nilaparvata lugens Stal (Homoptera: Delphacidae) were infected with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insect; Predation; Phylogenetics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000200002

Biodiversity and sustainable management of a tropical wetland lake ecosystem: A case study of Lake Kanyaboli, Kenya
Provedor de dados: 20
Autores: Rasowo, J.O.; Abila, R.; Manyala, J.
Lake Kanyaboli and the surrounding Yala swamp wetland has been recognized as an important biodiversity hotspot. Recent population genetic and phylogenetic studies confirm the evolutionary importance of Lake Kanyaboli (Kenya) in preserving the cichlid fish fauna of Lake Victoria. The adjoining Yala swamp harbours the endangered swamp antelope Sitatunga (Tragecephalus spekii) and several papyrus endemic birds. The lake and adjoining swamp play a critical role in the livelihood of the local communities who heavily depend on the wetland resources. Current ongoing large scale land use changes within the swamp threaten the ecological integrity and functioning of this highly dynamic wetland ecosystem. It is therefore imperative that proper management and...
Tipo: Proceedings Paper
Palavras-chave: Wetlands; Biodiversity; Resource conservation; Inland waters; Ecosystem management; Ecological crisis; Tropical environment; Population genetics; Phylogenetics; Lake fisheries; Freshwater fish; Aquatic birds; Land use.
Ano: 2006
URL: http://hdl.handle.net/1834/2126

Genética poblacional y filogeografía de Caretta caretta (Linnaeus, 1758)  y Cheloniamydas (Linnaeus, 1758): Una perspectiva regional con énfasis  en el suroeste de Cuba
Provedor de dados: 20
Autores: Ruiz Urquiola, A.
El manejo efectivo para la conservación de las tortugas marinas depende del  entendimiento de las interconexiones demográficas entre las poblaciones. En este trabajo  se determinaron la estructura poblacional,  la diversidad genética y las relaciones  filogenéticas y filogeográficas entre las principales colonias de anidación cubanas de  Chelonia mydas y Caretta caretta, y se compararon en un contexto regional, a partir de la  secuenciación de la primera mitad de la región no codificadora del DNA mitocóndrico, con  vistas a un manejo sostenible. En las colonias de anidación cubanas de ambas especies  estuvieron presentes los haplotipos más distribuidos y representados de los linajes de  cada especie informados para la región. No obstante, las colonias de...
Tipo: Theses and Dissertations
Palavras-chave: Population genetics; Phylogenetics; Marine turtles.
Ano: 2008
URL: http://hdl.handle.net/1834/5388

A cladistic re-assessment of the &lt;i&gt;Polycystis&lt;/i&gt; species complex (Polycystididae, Eukalyptorhynchia)
Provedor de dados: 27
Autores: Artois, T.J.; Schockaert, E.R.
The taxonomy of the genus &lt;i&gt;Polycystis&lt;/i&gt; Koelliker, 1845 &lt;i&gt;sensu&lt;/i&gt; Schockaert &amp; Karling, 1975 is discussed. Character analysis reveals the monophyletic state of the three species groups these authors defined within it. As no synapomorphies for the three groups can be found, the genus is split in three genera: &lt;i&gt;Polycystis&lt;/i&gt; Koelliker, 1845, &lt;i&gt;Macrorhynchus&lt;/i&gt; Graff, 1882 and &lt;i&gt;Paulodora Marcus&lt;/i&gt;, 1948. The systematic position of &lt;i&gt;Macrorhynchus yaganus&lt;/i&gt; (Marcus, 1954) Evdonin, 1977 is also discussed, resulting in the erection of the new genus &lt;i&gt;Marcusia&lt;/i&gt; gen. n.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phylogenetics; Taxonomy; Eukalyptorhynchia; Plathelminthes; Polycystididae; Polycystis.
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6815

Annonaceae substitution rates: a codon model perspective
Provedor de dados: 94
Autores: Chatrou,Lars Willem; Pirie,Michael David; Velzen,Robin Van; Bakker,Freek Theodoor.
The Annonaceae includes cultivated species of economic interest and represents an important source of information for better understanding the evolution of tropical rainforests. In phylogenetic analyses of DNA sequence data that are used to address evolutionary questions, it is imperative to use appropriate statistical models. Annonaceae are cases in point: Two sister clades, the subfamilies Annonoideae and Malmeoideae, contain the majority of Annonaceae species diversity. The Annonoideae generally show a greater degree of sequence divergence compared to the Malmeoideae, resulting in stark differences in branch lengths in phylogenetic trees. Uncertainty in how to interpret and analyse these differences has led to inconsistent results when estimating the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annonaceae; Branch lengths; Codon models; Non-synonymous substitution rate; Phylogenetics; Synonymous substitution rate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452014000500013

The marine brooder Excirolana braziliensis (Crustacea: Isopoda) is also a complex of cryptic species on the coast of Chile
Provedor de dados: 97
Autores: VARELA,ANDREA I; HAYE,PILAR A.
Speciation is a direct consequence of isolated populations in taxa with low dispersal potential. The brooding crustacean Excirolana braziliensis, with a presumably wide geographic range of distribution (~16° N-41° S in the Pacific and ~19° N-35° S in the Atlantic), has been detected to correspond to cryptic species on the coast of Panama. Latitudinal variations in reproductive features in E. braziliensis have been attributed to phenotypic plasticity, however, the differences may be the result of divergent populations. Considering that the taxon has been reported to be a complex of cryptic species in other geographic areas and given the phenotypic differences detected along its distribution range, we hypothesized that E. braziliensis is a complex of species...
Tipo: Journal article
Palavras-chave: Cryptic species; Genetic differentiation; Genetic distance; Marine peracarids; Phylogenetics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400011

Taxonomy and evolutionary relationships of Passiflora subg. Decaloba supersect. Decaloba sect. Xerogona (Passifloraceae): contributions of palynological, morphological and molecular studies
Provedor de dados: 39
Autores: Milward-de-Azevedo,Michaele Alvim; Freitas,Loreta Brandão de; Kinoshita,Luiza Sumiko.
Passiflora subg. Decaloba supersect. Decaloba sect. Xerogona (Passifloraceae) is a tropical and subtropical group comprising 14 species that occur in tropical biomes throughout Latin America, including the Atlantic Forest. The section Xerogona comprises herbaceous vines characterized by a lack of petiole glands on their leaves, of bracts and of ocelli on their leaf blades, as well as by their capsular fruits. We analyzed the phylogeny on the basis of morphological characters (including pollen characters) and molecular data. The inferred phylogeny was used in order to characterize, circumscribe and delimit the section and the species. We examined the phylogenetic relationships among the species, evaluating the circumscription of the section on the basis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora; Decaloba; Xerogona; Phylogenetics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300001

Distribution of HBV subgenotypes in Ribeirão Preto, Southeastern Brazil: a region with history of intense Italian immigration
Provedor de dados: 55
Autores: Chachá,Silvana Gama Florencio; Gomes-Gouvêa,Michele Soares; Malta,Fernanda de Mello; Ferreira,Sandro da Costa; Villanova,Márcia Guimarães; Souza,Fernanda Fernandes; Teixeira,Andreza Correa; Passos,Afonso Dinis da Costa; Pinho,João Renato Rebello; Martinelli,Ana de Lourdes Candolo.
Abstract Hepatitis B virus (HBV) is distributed worldwide, with geographical variations regarding prevalence of the different genotypes. The aim of this study was to determine the HBV genotypes and subgenotypes circulating in Southeast Brazil and compare the genetic sequences found with HBV sequences previously described in the world. Sequences from 166 chronic HBV carriers were analyzed using the fragment constituted by 1306 base pairs comprising surface and polymerase regions of the HBV genome. The sequences obtained were submitted to phylogenetic analysis. HBV subgenotypes A1, A2, D1-D4, F2a, and F4 were found. HBV genotype D was the most frequent, found in 99 patients (58.4%). Within this group, subgenotype D3 was the most prevalent, in 73 patients...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hepatitis B virus; Genotype; Phylogenetics; Intra-familial transmission.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702017000400424