keyword
MENU ▼
Read by QxMD icon Read
search

Species delimitation

keyword
https://www.readbyqxmd.com/read/28644507/intrachromosomal-karyotype-asymmetry-in-orchidaceae
#1
Enoque Medeiros-Neto, Felipe Nollet, Ana Paula Moraes, Leonardo P Felix
The asymmetry indexes have helped cytotaxonomists to interpret and classify plant karyotypes for species delimitation efforts. However, there is no consensus about the best method to calculate the intrachromosomal asymmetry. The present study aimed to compare different intrachromosomal asymmetry indexes in order to indicate which are more efficient for the estimation of asymmetry in different groups of orchids. Besides, we aimed to compare our results with the Orchidaceae phylogenetic proposal to test the hypothesis of Stebbins (1971)...
June 22, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28641042/resolving-the-melampsora-epitea-complex
#2
Peng Zhao, Makoto Kakishima, Qi Wang, Lei Cai
Melampsora epitea (Pucciniales, Basidiomycota) has been widely known as the main rust pathogen on willows, but its species boundary has been extremely confusing. Melampsora epitea was often confused with several morphologically similar species, such as M. arctica, M. humilis, and M. epiphylla. Recent DNA-based studies using specimens from North America and Europe suggested that M. epitea was a complex of several phylogenetic species. In this study, we examined the species boundary of M. epitea based on rDNA phylogeny and the general mixed Yule coalescent (GMYC) model from 534 specimens...
May 11, 2017: Mycologia
https://www.readbyqxmd.com/read/28623498/minimal-barcode-distance-between-two-water-mite-species-from-madeira-island-a-cautionary-tale
#3
Ricardo García-Jiménez, Jose Luis Horreo, Antonio G Valdecasas
In this work, we compare morphological and molecular data in their ability to distinguish between species of water mites (Acari, Prostigmata, Hydrachnidia). We have focused on the two species of the genus Lebertia inhabiting the island of Madeira. While traditional morphological traits were initially sufficient to distinguish between these two species, the molecular data were more dependable on the kind of analysis carried out. Single arbitrary genetic distance (e.g. a K2P distance below 2%) may lead to the conclusion that the specimens under study belong to the same species...
June 16, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28616163/a-genomic-assessment-of-species-boundaries-and-hybridization-in-a-group-of-highly-polymorphic-anoles-distichus-species-complex
#4
Daniel J MacGuigan, Anthony J Geneva, Richard E Glor
Delimiting young species is one of the great challenges of systematic biology, particularly when the species in question exhibit little morphological divergence. Anolis distichus, a trunk anole with more than a dozen subspecies that are defined primarily by dewlap color, may actually represent several independent evolutionary lineages. To test this, we utilized amplified fragment length polymorphisms (AFLP) genome scans and genetic clustering analyses in conjunction with a coalescent-based species delimitation method...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28611071/seedling-response-to-environmental-variability-the-relationship-between-phenotypic-plasticity-and-evolutionary-history-in-closely-related-eucalyptus-species
#5
Susan Rutherford, Stephen P Bonser, Peter G Wilson, Maurizio Rossetto
PREMISE OF THE STUDY: Phenotypic plasticity is an important means through which organisms cope with environmental variability. We investigated seedling plasticity in the green ash eucalypts within a phylogenetic framework to examine the relationship between plasticity and evolutionary history. The green ashes are a diverse group, which include the tallest flowering plant in the world (Eucalyptus regnans) and a rare mallee less than 1 m tall (E. cunninghamii). METHODS: Seedlings of 12 species were exposed to high and low nutrient and water availability in a factorial experiment...
June 13, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28610383/two-new-species-of-crocodile-skinks-squamata-scincidae-tribolonotus-from-the-solomon-archipelago
#6
Eric N Rittmeyer, Christopher C Austin
We describe two new species of the scincid lizard genus Tribolonotus from the islands of Buka and Choiseul in the Solomon Archipelago, closely related to, and previously included within, T. pseudoponceleti. One species, T. parkeri sp. nov., is endemic to Buka Island and was revealed in our previous study via taxonomically focused analyses of both next-generation sequencing data and morphology. Here, we also further support the validity of this species by more taxonomically comprehensive Bayesian species delimitation of three Sanger sequenced nuclear loci...
May 15, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610381/descriptions-of-three-new-species-of-the-harvestmen-genus-pseudogagrella%C3%A2-opiliones-sclerosomatidae-gagrellinae-from-taiwan-supported-by-morphological-and-molecular-evidence
#7
Ssu-Li Chen, Hsi-Te Shih
Three new species of Opiliones are delimited and described from central and northern Taiwan based on morphological and molecular evidence. Pseudogagrella dorsomaculata sp. nov., collected from the Dasyueshan Forest Recreation Area, Heping, Taichung, resembles P. andoi Suzuki 1977, but can be recognized by the different pattern of the first abdominal tergite and the morphology of the penile grans. Pseudogagrella nigridorsa sp. nov., collected from the Lalashan National Forest Sanctuary, Fusing, Taoyuan, resembles P...
May 15, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610226/integrative-taxonomy-reveals-cryptic-diversity-in-neotropical-grasshoppers-taxonomy-phylogenetics-and-evolution-of-the-genus-i-sphenarium-i-charpentier-1842-orthoptera-pyrgomorphidae
#8
Salomón Sanabria-Urbán, Hojun Song, Ken Oyama, Antonio González-Rodríguez, Raúl Cueva Del Castillo
The genus Sphenarium Charpentier, 1842 comprises the most diverse group of the New World Pyrgomorphidae. These grasshoppers show an extensive variation in external morphology, and are culturally and economically important for Mexican people since pre-Hispanic times. Nevertheless, the taxonomy of Sphenarium has been chaotic and remained incompletely resolved until now. Following an integrative taxonomic framework, we infer the number of species in this genus by species delimitation based on morphological, phylogenetic, and geographic information...
June 8, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610107/two-new-genera-of-pyroglyphid-mites-i-tuccioglyphus-i-and-i-marioglyphus-i-%C3%A2-with-a-key-to-genera-of-the-world-acari-pyroglyphidae
#9
Tamara Bianca Horn, Júlia Jantsch Ferla, Júlia Horn Körbes, Júlia Horn Körbes, Juliana Granich, Barry Oconnor, Pavel Klimov, Noeli Juarez Ferla
We describe Tuccioglyphus setosus gen. et sp. nov. from the litter of commercially reared laying hens as well as wild birds in Brazil. The new genus Tuccioglyphus presents a mixture of character states between the two conventional subfamilies, Pyroglyphinae and Dermatophagoidinae. Based on this new unusual genus, we discuss character states delimiting these and other major subfamilies of the house dust mite family, Pyroglyphidae, as well as its most important and species-rich genus Dermatophagoides. An additional new genus, Marioglyphus gen...
March 20, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610073/new-or-little-known-species-of-i-chaetocladius-i-s-str-kieffer-1911-diptera-chironomidae-orthocladiinae-from-the-amur-river-basin-russian-far-east
#10
Eugenyi A Makarchenko, Marina A Makarchenko, Alexander A Semenchenko
Chironomids of the subgenus Chaetocladius s. str. from the Amur River basin are revised using both morphological characters and molecular data. Three new species, C. egorych sp. nov., C. lopatinskiy sp. nov. and C. yavorskayae sp. nov., are described and figured. The pupa of C. fedotkin is described for the first time. Adult males of C. ligni and C. piger, little-known in the Far East, are redescribed and annotated, and key to males of the Chaetocladius s. str. from the Amur River basin is provided. A reference 658 bp barcode sequence from a fragment of the mitochondrial gene cytochrome oxidase I (COI) was used as a tool for species delimitation...
March 27, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610041/new-species-of-i-diatrichalus-i-coleoptera-lycidae-from-new-guinea-and-the-moluccas
#11
Matej Bocek
The recently collected material of Diatrichalus Kleine, 1926 from New Guinea and the Moluccas was studied. Four new species are described: D. buruensis sp. n., D. manokwarensis sp. n., D. mindikensis sp. n., and D. robustus sp. n. The diagnostic morphological characters are described in detail and illustrated. New records of previously described species are reported from several localities in New Guinea and D. mancus (Kleine, 1926) is for the first time reported from the Australian continent. Some Diatrichalus have similar male genitalia and are considered as closely related...
March 30, 2017: Zootaxa
https://www.readbyqxmd.com/read/28609991/the-use-of-bioacoustics-in-anuran-taxonomy-theory-terminology-methods-and-recommendations-for-best-practice
#12
Jörn Köhler, Martin Jansen, Ariel Rodríguez, Philippe J R Kok, Luís Felipe Toledo, Mike Emmrich, Frank Glaw, Célio F B Haddad, Mark-Oliver Rödel, Miguel Vences
Vocalizations of anuran amphibians have received much attention in studies of behavioral ecology and physiology, but also provide informative characters for identifying and delimiting species. We here review the terminology and variation of frog calls from a perspective of integrative taxonomy, and provide hands-on protocols for recording, analyzing, comparing, interpreting and describing these sounds. Our focus is on advertisement calls, which serve as premating isolation mechanisms and, therefore, convey important taxonomic information...
April 11, 2017: Zootaxa
https://www.readbyqxmd.com/read/28606445/multilocus-coalescent-species-delimitation-to-evaluate-traditionally-defined-morphotypes-in-hydrangea-sect-asperae-hydrangeaceae
#13
Yannick De Smet, Olivier De Clerck, Tatsuya Uemachi, Carolina Granados Mendoza, Stefan Wanke, Paul Goetghebeur, Marie-Stéphanie Samain
The number of species recognized in section Asperae of the flowering plant genus Hydrangea differs widely between subsequent revisions. This variation is largely centered around the H. aspera species complex, with numbers of recognized species varying from one to nearly a dozen. Despite indications of molecular variation in this complex, no sequence-based species delimitation methods have been employed to evaluate the primarily morphology-based species boundaries. In the present study, a multi-locus coalescent-based approach to species delimitation is employed in order to identify separate evolutionary lines within H...
June 9, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28603933/pretarsal-structures-in-leiodidae-and-agyrtidae-coleoptera-staphylinoidea
#14
Pedro Gnaspini, Caio Antunes-Carvalho, Richard A B Leschen
We analysed pretarsal characters of 87 species of Leiodidae (including 10 cholevines and representatives of all tribes and ca. 60% of the genera of non-cholevines), five species of Agyrtidae, and nine representatives of outgroup taxa (Hydraenidae, Staphylinidae, Hydrophilidae, and Histeridae) using scanning electron microscopy. We focused our observations on the architecture of the empodium (including the sclerites and associated setae), the shape and composition of the medial projection of the distal margin of the terminal tarsomere, and the armature of the claws, which were considered a promising source of information for delimiting supraspecific taxa in our previous study...
June 11, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28603037/species-boundaries-in-the-astragalus-cusickii-complex-delimited-using-molecular-phylogenetic-techniques
#15
J C Zimmers, M Thomas, L Yang, A Bombarely, M M Mancuso, M F Wojciechowski, J F Smith
Understanding the source of phenotypic variability is a challenge in the biological sciences. Variation in phenotypes is the result of variation in the genetics and environment the organism experiences, but elucidating the relative contribution of these two parameters can pose problems, especially in the field of systematics. Systematists are challenged to classify biological diversity into groups that share common ancestry. Phenotypic variation can be useful to demonstrate common ancestry, but only when the primary contributor to the variation is under strong genetic control, and thus heritable...
June 8, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28600183/integrative-species-delimitation-of-the-widespread-north-american-jumping-mice-zapodinae
#16
Jason L Malaney, John R Demboski, Joseph A Cook
Delimiting species can be challenging, but is a key step for the critical examination of evolutionary history and for prioritizing conservation efforts. Because systematic relationships are often determined iteratively using tests based on taxonomy, such methods can fail to detect cryptic variation and result in biased conclusions. Conversely, discovery-based approaches provide a powerful way to define operational taxonomic units and test species boundaries. We compare both approaches (taxonomy-based delimitation - TBD and discovery-based delimitation - DBD) within North American jumping mice (Zapodinae) using broad sampling, multilocus analyses, and ecological tests...
June 21, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28592249/ixora-rubiaceae-on-the-philippines-crossroad-or-cradle
#17
Cecilia I Banag, Arnaud Mouly, Grecebio Jonathan D Alejandro, Birgitta Bremer, Ulrich Meve, Guido W Grimm, Sigrid Liede-Schumann
BACKGROUND: The Philippine archipelago is globally one of the most important model island systems for studying evolutionary processes. However, most plant species on this archipelago have not yet been studied in sufficient detail. The main aim of this study is to unravel the evolutionary history and biogeographic relationships of the Philippine members of the pantropical genus Ixora. RESULTS: The complex plastid and nuclear divergence patterns in Philippine Ixora, documented using tree and network approaches, reveal a highly dynamic evolution in Ixora, involving several phases of radiation and recolonization...
June 7, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28591150/more-than-one-fungus-in-the-pepper-pot-integrative-taxonomy-unmasks-hidden-species-within-myriostoma-coliforme-geastraceae-basidiomycota
#18
Julieth O Sousa, Laura M Suz, Miguel A García, Donis S Alfredo, Luana M Conrado, Paulo Marinho, A Martyn Ainsworth, Iuri G Baseia, María P Martín
Since the nineteenth century, Myriostoma has been regarded as a monotypic genus with a widespread distribution in north temperate and subtropical regions. However, on the basis of morphological characters and phylogenetic evidence of DNA sequences of the internal transcribed spacer (ITS) regions and the large subunit nuclear ribosomal RNA gene (LSU), four species are now delimited: M. areolatum comb. & stat. nov., M. calongei sp. nov., M. capillisporum comb. & stat. nov., and M. coliforme. Myriostoma coliforme is typified by selecting a lectotype (iconotype) and a modern sequenced collection as an epitype...
2017: PloS One
https://www.readbyqxmd.com/read/28587671/integrative-taxonomy-by-molecular-species-delimitation-multi-locus-data-corroborate-a-new-species-of-balkan-drusinae-micro-endemics
#19
Simon Vitecek, Mladen Kučinić, Ana Previšić, Ivana Živić, Katarina Stojanović, Lujza Keresztes, Miklós Bálint, Felicitas Hoppeler, Johann Waringer, Wolfram Graf, Steffen U Pauls
BACKGROUND: Taxonomy offers precise species identification and delimitation and thus provides basic information for biological research, e.g. through assessment of species richness. The importance of molecular taxonomy, i.e., the identification and delimitation of taxa based on molecular markers, has increased in the past decade. Recently developed exploratory tools now allow estimating species-level diversity in multi-locus molecular datasets. RESULTS: Here we use molecular species delimitation tools that either quantify differences in intra- and interspecific variability of loci, or divergence times within and between species, or perform coalescent species tree inference to estimate species-level entities in molecular genetic datasets...
June 6, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28587639/unravelling-mummies-cryptic-diversity-host-specificity-trophic-and-coevolutionary-interactions-in-psyllid-parasitoid-food-webs
#20
Aidan A G Hall, Martin J Steinbauer, Gary S Taylor, Scott N Johnson, James M Cook, Markus Riegler
BACKGROUND: Parasitoids are hyperdiverse and can contain morphologically and functionally cryptic species, making them challenging to study. Parasitoid speciation can arise from specialisation on niches or diverging hosts. However, which process dominates is unclear because cospeciation across multiple parasitoid and host species has rarely been tested. Host specificity and trophic interactions of the parasitoids of psyllids (Hemiptera) remain mostly unknown, but these factors are fundamentally important for understanding of species diversity, and have important applied implications for biological control...
June 6, 2017: BMC Evolutionary Biology
keyword
keyword
8395
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"