Number of results to display per page
Search Results
12. A comparative study of Ligophorus uruguayense and L. saladensis (Monogenea: Ancyrocephalidae) from Mugil liza (Teleostei: Mugilidae) in southern Brazil
- Creator:
- Marchiori, Natalia C, Pariselle, Antoine, Pereira, Joaber, Agnèse, Jean-François, Durand, Jean-Dominique, and Vanhove, Maarten P.M
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- morfologie (biologie), parazitické organismy, morphology (biology), parasitic organisms, molecular systematics, mullet, taxonomy, 2, and 59
- Language:
- English
- Description:
- Representatives of Ligophorus Euzet et Suriano, 1977 were found on the gills of Mugil liza Valenciennes caught in southern Brazil. They were identified as Ligophorus uruguayense Failla Siquier et Ostrowski de Núñez, 2009 and Ligophorus saladensis Marcotegui et Martorelli, 2009, even though specific identification proved to be difficult due to inconsistencies in some diagnostic features reported for these two species. Therefore, a combined morphological and molecular approach was used to critically review the validity of these species, by means of phase contrast and confocal fluorescence microscopical examination of sclerotised hard parts, and assessing the genetic divergence between L. saladensis, L. uruguayense and their congeners using rDNA sequences. The main morphological differences between the two species relate to the shape of the accessory piece of the penis and the median process of the ventral bar. The accessory piece in L. uruguayense is shorter than in L. saladensis, has a cylindrical, convex upper lobe and straight lower lobe (vs with the distal tip of the lower lobe turning away from the upper lobe in the latter species). The ventral bar has a V-shaped anterior median part in L. uruguayense (vs U-shaped in L. saladensis). The two species are suggested to be part of a species complex together with L. mediterraneus Sarabeev, Balbuena et Euzet, 2005. We recommend to generalise such comparative assessment of species of Ligophorus for a reliable picture of the diversity and diversification mechanisms within the genus, and to make full use of its potential as an additional marker for mullet taxonomy and systematics., Natalia C. Marchiori, Antoine Pariselle, Joaber Pereira Jr., Jean-François Agnèse, Jean-Dominique Durand, Maarten P.M. Vanhove., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
13. A model of focusing in political choice
- Creator:
- Nunnari, Salvatore and Zápal, Jan
- Publisher:
- CERGE-EI
- Format:
- electronic, svazek, and 46 stran : ilustrace.
- Type:
- model:monograph and TEXT
- Subject:
- Volby, volební kampaně, referenda, volební chování, polarizace (sociologie), behaviorismus (politologie), electoral behavior, polarization (sociology), behaviorism (political science), 324:316.62, 316.4.063.24, 321:316.275, (048.8), 15, and 324
- Language:
- English and Czech
- Description:
- Salvatore Nunnari, Jan Zápal., Obsahuje bibliografii a bibliografické odkazy, Anglické a české resumé, and born digital
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
14. A multilevel analysis of innovation in developing countries
- Creator:
- Srholec, Martin, Kejak, Michal, Univerzita Karlova. Centrum pro ekonomický výzkum a doktorské studium, and Národohospodářský ústav (Akademie věd ČR)
- Publisher:
- CERGE-EI
- Format:
- electronic and 42 s.
- Type:
- model:monograph and TEXT
- Subject:
- Věda. Všeobecnosti. Základy vědy a kultury. Vědecká práce, inovace, inovační podnikání, víceúrovňová analýza, matematické modelování, 001.895, 658:001.895, 303.732.3, 519.673, (048.8), 12, and 00
- Language:
- English
- Description:
- Martin Srholec. and born digital
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
15. A new feather mite of the genus Dolichodectes (Astigmata: Proctophyllodidae) from Hippolais polyglotta (Passeriformes: Acrocephalidae) in Spain
- Creator:
- Mironov, Sergey V, Doña, Jorge, and Jovani, Roger
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- parazitologie, parasitology, Acari, Pterodectinae, ectoparasites, systematics, passerines, molecular study, COI, 2, and 59
- Language:
- English
- Description:
- A new feather mite species, Dolichodectes hispanicus sp. n. (Astigmata: Proctophyllodidae), is described from the Melodious Warbler Hippolais polyglotta (Vieillot) (Passeriformes: Acrocephalidae) in Spain. The new species is closest to the type species of the genus, D. edwardsi (Trouessart, 1885) from the Grear Reed-Warbler Acrocephalus arundinaceus (Linnaeus) (Acrocephalidae). Adults of D. hispanicus differ from those of D. edwardsi by dimensional characteristics, in particular, by having shorter aedeagus that does not extend to the anal suckers in males and shorter hysteronotal shield in females. Tritonymphs of D. hispanicus are much more distinctive and differ from those of D. edwardsi by having the prodorsal shield covering all the prodorsum, the hysteronotal shield occupying about three quarters of the hysterosoma, and idiosomal setae h3 being filiform. The morphological description of the new species is augmented by sequence data from the mitochondrial cytochrome c oxidase subunit I gene fragment (COI)., Sergey V. Mironov, Jorge Doña, Roger Jovani., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
16. A new genus and species of proteocephalidean tapeworm (Cestoda), first parasite found in the driftwood catfish Tocantinsia piresi (Siluriformes: Auchenipteridae) from Brazil
- Creator:
- Alves, Philippe Vieira, Chambrier, Alain de, Tomáš Scholz, and Luque, José Luis
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- morfologie (biologie), morphology (biology), Amazonka (řeka : oblast), Xingu (Brazílie : řeka), Amazon River Basin, Xingu River (Brazil), taxonomy, Proteocephalidea, metascolex, Neotropical Region, 2, and 59
- Language:
- English
- Description:
- Frezella gen. n. is proposed to accommodate Frezella vaucheri sp. n. from poorly known auchenipterid fish, Tocantinsia piresi (Miranda Ribeiro), from the Xingú River, one of the principal tributaries of the lower Amazon River in Brazil. The new genus belongs to the Proteocephalinae because of the medullary position of the testes, ovary (yet some follicles penetrate to the cortex on the dorsal side), vitelline follicles and uterus. It differs from other proteocephaline genera in the morphology of the scolex, which includes a metascolex composed of two distinct zones: anterior, strongly wrinkled part posterior to the suckers, and posterior, sparsely folded zone. Frezella can also be differentiated by having the internal longitudinal musculature hypertrophied laterally on both sides, the presence of some ovarian follicles in the cortex on the dorsal side and the presence of additional pair of tiny, thin-walled osmoregulatory canals situated slightly dorsomedian to ventral canals. Frezella vaucheri is the first helminth parasite reported from T. piresi, which occurs in the lower reaches of the Amazon and Tocantins River basins in Brazil., Philippe Vieira Alves, Alain de Chambrier, Tomáš Scholz, José Luis Luque., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
17. A new species of Wallinia Pearse, 1920 (Digenea: Allocreadiidae) in Astyanax mexicanus (Characidae) from Mexico revealed by morphology and sequences of the 28S ribosomal RNA gene
- Creator:
- Pérez-Ponce de León, Gerardo, Razo-Mendivil, Ulises, Mendoza-Garfias, Berenit, Rubio-Godoy, Miguel, and Choudhury, Anindo
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- DNA (nukleová kyselina), parazitičtí červi, sladkovodní ryby, deoxyribonucleic acid, helminth parasites, freshwater fishes, Severní Amerika, North America, taxonomy, 2, and 59
- Language:
- English
- Description:
- Wallinia mexicana sp. n. is described from the Mexican tetra, Astyanax mexicanus (De Filippi) (Characidae Weitzman), from two localities in northern Mexico. The new species can be distinguished from the two congeneric species, described from small-bodied characids in South and Central America, mainly by the posterior extent of the vitelline follicles (halfway between the posterior testis and the end of the caeca), by having a larger oesophagus, testes that are always oblique, and eye-spot remnants. The distinct status of the new species was confirmed by molecular data (28S rRNA gene sequences). Phylogenetic analysis suggests the new species is the sister species of W. chavarriae Choudhury, Hartvigsen et Brooks, 2002 described from characids in northwestern Costa Rica. Additionally, genetic divergence between these congeners reached 3.3%, a value higher than that observed for closely related species pairs of allocreadiids for that molecular marker. Based on these new findings, recently published records of this new species as Magnivitellinum simplex Kloss, 1966 and Creptotrematina aguirrepequenoi Jiménez-Guzmán, 1973 in Astyanax mexicanus from Durango and San Luis Potosi states, respectively, are corrected., Gerardo Pérez-Ponce de León, Ulises Razo-Mendivil, Berenit Mendoza-Garfias, Miguel Rubio-Godoy, Anindo Choudhury., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
18. A note on equilibrium uniqueness in the Baron-Ferejohn model
- Creator:
- Celik, Levent, Karabay, Bilgehan, Univerzita Karlova. Centrum pro ekonomický výzkum a doktorské studium, and Národohospodářský ústav (Akademie věd ČR)
- Publisher:
- CERGE-EI
- Format:
- electronic and 10 s.
- Type:
- model:monograph and TEXT
- Subject:
- Ekonomie, experimentální ekonomie, matematické modelování, 33-028.77, 519.673, (048.8), 4, and 33
- Language:
- English and Czech
- Description:
- Levent Celik, Bilgehan Karabay., Obsahuje bibliografii a bibliografické odkazy., České resumé, and born digital
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
19. A note on optimal experimentation under risk aversion
- Creator:
- Novák, Vladimír and Willems, Tim
- Publisher:
- CERGE-EI
- Format:
- electronic, bez média, svazek, and 18 stran.
- Type:
- model:monograph and TEXT
- Subject:
- Ekonomie, riziko, experimentální ekonomie, risk, experimental economics, 159.955.5-027.233, 33-028.77, (048.8), 4, and 33
- Language:
- English and Czech
- Description:
- Vladimír Novák, Tim Willems., Obsahuje bibliografii a bibliografické odkazy, and České a anglické resumé
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
20. A novel myxozoan parasite of terrestrial mammals: description of Soricimyxum minuti sp. n. (Myxosporea) in pygmy shrew Sorex minutus from Hungary
- Creator:
- Székely, Csaba, Cech, Gábor, Atkinson, Stephen D, Kálmán Molnár, Egyed, László, and Gubányi, András
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- žlučové cesty, játra, biliary ducts, liver, Maďarsko, Hungary, Myxozoa, Soricimyxum spp., bile ducts, mammalian hosts, Sorex spp., 2, and 59
- Language:
- English
- Description:
- As part of a biodiversity study in northwestern Hungary, we conducted a parasitological survey of small mammals. In both common shrews (Sorex araneus Linnaeus) and pygmy shrews (Sorex minutus Linnaeus), we found myxospores of a species of Soricimyxum Prunescu, Prunescu, Pucek et Lom, 2007 (Myxosporea) and plasmodia in the bile ducts within the liver. Spores from both species of shrewswere morphologically and morphometrically indistinguishable, but differed in their SSU rRNA gene sequences by 3.3%. We identified spores and developmental stages from the common shrew as Soricimyxum fegati Prunescu, Prunescu, Pucek et Lom, 2007, based on morphometric data and DNA sequence similarity. Spores from the pygmy shrew were only 96.7% similar to S. fegati, hence we identified them as a novel myxosporean Soricimyxum minuti sp. n. This is only the second myxosporean parasite species described from mammals., Csaba Székely, Gábor Cech, Stephen D. Atkinson, Kálmán Molnár, László Egyed, András Gubányi., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public