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Species delimitation

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https://www.readbyqxmd.com/read/28931156/epiverta-dieke-coleoptera-coccinellidae-epilachnini-a-complex-of-species-not-a-monotypic-genus
#1
Wioletta Tomaszewska, Lizhi Huo, Karol Szawaryn, Xingmin Wang
Rich sampling and modern research techniques, including SEM, revealed that rarely collected epilachnine species Epiverta chelonia is a complex of four closely related species: E. chelonia (Mader, 1933), E. albopilosa, E. angusta, and E. supinata spp. nov. All Epiverta species are described and illustrated, a key to the species and a distribution map are provided. Lectotype of Solanophila cheloniaMader, 1933 is designated and its type locality delimited to Yunnan Province, Deqin County (China).
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28931084/barcoding-snakeheads-teleostei-channidae-revisited-discovering-greater-species-diversity-and-resolving-perpetuated-taxonomic-confusions
#2
Cecilia Conte-Grand, Ralf Britz, Neelesh Dahanukar, Rajeev Raghavan, Rohan Pethiyagoda, Heok Hui Tan, Renny K Hadiaty, Norsham S Yaakob, Lukas Rüber
Snakehead fishes of the family Channidae are predatory freshwater teleosts from Africa and Asia comprising 38 valid species. Snakeheads are important food fishes (aquaculture, live food trade) and have been introduced widely with several species becoming highly invasive. A channid barcode library was recently assembled by Serrao and co-workers to better detect and identify potential and established invasive snakehead species outside their native range. Comparing our own recent phylogenetic results of this taxonomically confusing group with those previously reported revealed several inconsistencies that prompted us to expand and improve on previous studies...
2017: PloS One
https://www.readbyqxmd.com/read/28926149/speciation-below-ground-tempo-and-mode-of-diversification-in-a-radiation-of-endogean-ground-beetles
#3
Carmelo Andújar, Sergio Pérez-González, Paula Arribas, Juan P Zaballos, Alfried P Vogler, Ignacio Ribera
Dispersal is a critical factor determining the spatial scale of speciation, which is constrained by the ecological characteristics and distribution of a species' habitat and the intrinsic traits of species. Endogean taxa are strongly affected by the unique qualities of the below-ground environment and its effect on dispersal, and contrasting reports indicate either high dispersal capabilities favoured by small body size and mediated by passive mechanisms, or low dispersal due to restricted movement and confinement inside the soil...
September 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28922764/a-pentatricopeptide-repeat-protein-restores-nap-cytoplasmic-male-sterility-in-brassica-napus
#4
Zhi Liu, Faming Dong, Xiang Wang, Tao Wang, Rui Su, Dengfeng Hong, Guangsheng Yang
Two forms of male-sterile cytoplasm, designated nap and pol, are found in the oilseed rape species, Brassica napus. The nap cytoplasm is observed in most B. napus varieties, and it confers male sterility on a limited number of cultivars that lack the corresponding restorer gene, Rfn. In the present study, using linkage analysis in combination with 5652 BC1 progeny derived from a cross between a nap cytoplasmic male sterility (CMS) line 181A and a restorer line H5, we delimited the Rfn gene to a 10.5 kb region on chromosome A09, which contained three putative ORFs...
July 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28919503/a-multilocus-phylogeny-of-the-genus-sarcohyla-anura-hylidae-and-an-investigation-of-species-boundaries-using-statistical-species-delimitation
#5
Itzue W Caviedes Solis, Adrián Nieto-Montes de Oca
The genus Sarcohyla is composed by 24 species endemic to México. Despite the large number of phylogenetic studies focusing on the family Hylidae, the relationships among the species of Sarcohyla are still poorly known, and the scarce numbers of specimens and tissue samples available for some of the species has hampered an appropriate phylogenetic analysis. We present the most comprehensive molecular phylogenetic study of Sarcohyla to date. We included 17 species of the genus Sarcohyla using data from two mitochondrial (ND1 and 12S) and three nuclear genes (Rag-1, Rhod, and POMc)...
September 14, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28916574/systematic-review-of-the-gastrointestinal-effects-of-a1-compared-with-a2-%C3%AE-casein
#6
REVIEW
Simon Brooke-Taylor, Karen Dwyer, Keith Woodford, Natalya Kost
This is the first systematic review, to our knowledge, of published studies investigating the gastrointestinal effects of A1-type bovine β-casein (A1) compared with A2-type bovine β-casein (A2). The review is relevant to nutrition practice given the increasing availability and promotion in a range of countries of dairy products free of A1 for both infant and adult nutrition. In vitro and in vivo studies (all species) were included. In vivo studies were limited to oral consumption. Inclusion criteria encompassed all English-language primary research studies, but not reviews, involving milk, fresh-milk products, β-casein, and β-casomorphins published through 12 April 2017...
September 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28911112/integrative-and-conjugative-elements-and-their-hosts-composition-distribution-and-organization
#7
Jean Cury, Marie Touchon, Eduardo P C Rocha
Conjugation of single-stranded DNA drives horizontal gene transfer between bacteria and was widely studied in conjugative plasmids. The organization and function of integrative and conjugative elements (ICE), even if they are more abundant, was only studied in a few model systems. Comparative genomics of ICE has been precluded by the difficulty in finding and delimiting these elements. Here, we present the results of a method that circumvents these problems by requiring only the identification of the conjugation genes and the species' pan-genome...
September 6, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28904797/a-cross-validation-based-approach-for-delimiting-reliable-home-range-estimates
#8
Eric R Dougherty, Colin J Carlson, Jason K Blackburn, Wayne M Getz
BACKGROUND: With decreasing costs of GPS telemetry devices, data repositories of animal movement paths are increasing almost exponentially in size. A series of complex statistical tools have been developed in conjunction with this increase in data. Each of these methods offers certain improvements over previously proposed methods, but each has certain assumptions or shortcomings that make its general application difficult. In the case of the recently developed Time Local Convex Hull (T-LoCoH) method, the subjectivity in parameter selection serves as one of the primary impediments to its more widespread use...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28899691/transcriptome-modulation-of-bovine-trophoblast-cells-in-vitro-by-neospora-caninum
#9
Pilar Horcajo, Laura Jiménez-Pelayo, Marta García-Sánchez, Javier Regidor-Cerrillo, Esther Collantes-Fernández, Daniel Rozas, Nina Hambruch, Christiane Pfarrer, Luis Miguel Ortega-Mora
Neospora caninum is one of the most efficient transplacentally transmitted pathogens in cattle and is a cause of abortion in this domestic species. The invasion and proliferation of Neospora caninum in the placenta and its dissemination to the foetus are crucial events in the outcome of an infection. In the bovine placenta, the placentomes are formed by maternal caruncles, which are delimited by a maternal epithelium and foetal cotyledons, which are delimited by an epithelial layer named the trophoblast. These epithelia form a physical barrier against foetal infection...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28899345/phylogeographic-structure-cryptic-speciation-and-demographic-history-of-the-sharpbelly-hemiculter-leucisculus-a-freshwater-habitat-generalist-from-southern-china
#10
Weitao Chen, Zaixuan Zhong, Wei Dai, Qi Fan, Shunping He
BACKGROUND: Species with broad distributions frequently divide into multiple genetic forms and may therefore be viewed as "cryptic species". Here, we used the mitochondrial cytochrome b (Cytb) and 12 nuclear DNA loci to investigate phylogeographic structures of the sharpbelly (Hemiculter leucisculus) in rivers in southern China and explored how the geological and climatic factors have shaped the genetic diversity and evolutionary history of this species. RESULTS: Our mitochondrial phylogenetic analysis identified three major lineages (lineages A, B, and C)...
September 12, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28892487/transcriptome-sequencing-and-delimitation-of-sympatric-oscarella-species-o-carmela-and-o-pearsei-sp-nov-from-california-usa
#11
Alexander V Ereskovsky, Daniel J Richter, Dennis V Lavrov, Klaske J Schippers, Scott A Nichols
The homoscleromorph sponge Oscarella carmela, first described from central California, USA is shown to represent two superficially similar but both morphologically and phylogenetically distinct species that are co-distributed. We here describe a new species as Oscarella pearsei, sp. nov. and re-describe Oscarella carmela; the original description was based upon material from both species. Further, we correct the identification of published genomic/transcriptomic resources that were originally attributed to O...
2017: PloS One
https://www.readbyqxmd.com/read/28889912/a-systematic-overview-of-descolea-agaricales-in-the-nothofagaceae-forests-of-patagonia
#12
Francisco Kuhar, Matthew E Smith, Alija Mujic, Camille Truong, Eduardo Nouhra
The descolea clade includes species of ectomycorrhizal basidiomycetes in the genera Descolea, Setchelliogaster, Descomyces, and Timgrovea that are known primarily from the Southern Hemisphere. Taxa in this group produce basidiomes that range in morphology from typical epigeous mushrooms (Descolea) and secotioid taxa (Setchelliogaster) to fully gasteroid species (Descomyces and Timgrovea). High intraspecific morphological variation has been reported in several species within this clade, suggesting that careful morphological and molecular studies are needed to refine species concepts...
October 2017: Fungal Biology
https://www.readbyqxmd.com/read/28888791/a-multilocus-view-on-mediterranean-aeolid-nudibranchs-mollusca-systematics-and-cryptic-diversity-of-flabellinidae-and-piseinotecidae
#13
Giulia Furfaro, Daniele Salvi, Emiliano Mancini, Paolo Mariottini
Recent molecular studies revealed high level of endemism and numerous cryptic species within opisthobranchs, with Mediterranean taxa clearly understudied. Here we used genetic data from both mitochondrial and nuclear gene fragments as well as morphological data from taxonomically relevant characters to investigate the phylogenetic relationships and systematics of Mediterranean taxa of the Flabellinidae and Piseinotecidae families. Phylogenetic analyses based on Bayesian and Maximum-Likelihood methods indicate that Flabellinidae and Pisenotecidae taxa and species within the genera Flabellina, Calmella and Piseinotecus do not form monophyletic clades...
September 6, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28887657/fine-mapping-of-the-soybean-aphid-resistance-genes-rag6-and-rag3c-from-glycine-soja-85-32
#14
Shichen Zhang, Zhongnan Zhang, Zixiang Wen, Cuihua Gu, Yong-Qiang Charles An, Carmille Bales, Chris DiFonzo, Qijian Song, Dechun Wang
Rag6 and Rag3c were delimited to a 49-kb interval on chromosome 8 and a 150-kb interval on chromosome 16, respectively. Structural variants in the exons of candidate genes were identified. The soybean aphid, an invasive species, has significantly threatened soybean production in North America since 2000. Host-plant resistance is known as an ideal management strategy for aphids. Two novel aphid-resistance loci, Rag6 and Rag3c, from Glycine soja 85-32, were previously detected in a 10.5-cM interval on chromosome 8 and a 7...
September 8, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28878964/the-role-of-climatic-and-geological-events-in-generating-diversity-in-ethiopian-grass-frogs-genus-ptychadena
#15
Megan L Smith, Brice P Noonan, Timothy J Colston
Ethiopia is a world biodiversity hotspot and harbours levels of biotic endemism unmatched in the Horn of Africa, largely due to topographic-and thus habitat-complexity, which results from a very active geological and climatic history. Among Ethiopian vertebrate fauna, amphibians harbour the highest levels of endemism, making amphibians a compelling system for the exploration of the impacts of Ethiopia's complex abiotic history on biotic diversification. Grass frogs of the genus Ptychadena are notably diverse in Ethiopia, where they have undergone an evolutionary radiation...
August 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28877741/morphometric-variability-among-the-species-of-the-sordida-subcomplex-hemiptera-reduviidae-triatominae-evidence-for-differentiation-across-the-distribution-range-of-triatoma-sordida
#16
Julieta Nattero, Romina Valeria Piccinali, Catarina Macedo Lopes, María Laura Hernández, Luciana Abrahan, Patricia Alejandra Lobbia, Claudia Susana Rodríguez, Ana Laura Carbajal de la Fuente
BACKGROUND: The Sordida subcomplex (Triatominae) comprises four species, Triatoma garciabesi, T. guasayana, T. patagonica and T. sordida, which differ in epidemiological importance and adaptations to human environments. Some morphological similarities among species make taxonomic identification, population differentiation and species delimitation controversial. Triatoma garciabesi and T. sordida are the most similar species, having been considered alternatively two and a single species until T...
September 6, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28875076/validation-and-description-of-two-new-north-western-australian-rainbow-skinks-with-multispecies-coalescent-methods-and-morphology
#17
Ana C Afonso Silva, Natali Santos, Huw A Ogilvie, Craig Moritz
While methods for genetic species delimitation have noticeably improved in the last decade, this remains a work in progress. Ideally, model based approaches should be applied and considered jointly with other lines of evidence, primarily morphology and geography, in an integrative taxonomy framework. Deep phylogeographic divergences have been reported for several species of Carlia skinks, but only for some eastern taxa have species boundaries been formally tested. The present study does this and revises the taxonomy for two species from northern Australia, Carlia johnstonei and C...
2017: PeerJ
https://www.readbyqxmd.com/read/28861248/growth-form-evolution-and-hybridization-in-senecio-asteraceae-from-the-high-equatorial-andes
#18
Eva Dušková, Petr Sklenář, Filip Kolář, Diana L A Vásquez, Katya Romoleroux, Tomáš Fér, Karol Marhold
Changes in growth forms frequently accompany plant adaptive radiations, including páramo-a high-elevation treeless habitat type of the northern Andes. We tested whether diverse group of Senecio inhabiting montane forests and páramo represented such growth form changes. We also investigated the role of Andean geography and environment in structuring genetic variation of this group. We sampled 108 populations and 28 species of Senecio (focusing on species from former genera Lasiocephalus and Culcitium) and analyzed their genetic relationships and patterns of intraspecific variation using DNA fingerprinting (AFLPs) and nuclear DNA sequences (ITS)...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28861219/disentangling-the-genetic-and-morphological-structure-of-patella-candei-complex-in-macaronesia-ne-atlantic
#19
Joao Faria, Gustavo M Martins, Alfonso Pita, Pedro A Ribeiro, Stephen J Hawkins, Pablo Presa, Ana I Neto
The uptake of natural living resources for human consumption has triggered serious changes in the balance of ecosystems. In the archipelagos of Macaronesia (NE Atlantic), limpets have been extensively exploited probably since islands were first colonized. This has led to profound consequences in the dynamics of rocky shore communities. The Patella candei complex includes various subspecies of limpets that are ascribed to a particular archipelago and has been the focus of several taxonomic surveys without much agreement...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28861062/evolutionary-genetic-analysis-uncovers-multiple-species-with-distinct-habitat-preferences-and-antibiotic-resistance-phenotypes-in-the-stenotrophomonas-maltophilia-complex
#20
Luz E Ochoa-Sánchez, Pablo Vinuesa
The genus Stenotrophomonas (Gammaproteobacteria) has a broad environmental distribution. Stenotrophomonas maltophilia is its best known species because it is a globally emerging, multidrug-resistant (MDR), opportunistic pathogen. Members of this species are known to display high genetic, ecological and phenotypic diversity, forming the so-called S. maltophilia complex (Smc). Heterogeneous resistance and virulence phenotypes have been reported for environmental Smc isolates of diverse ecological origin. We hypothesized that this heterogeneity could be in part due to the potential lumping of several cryptic species in the Smc...
2017: Frontiers in Microbiology
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