oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Los Laparocerus Schoenherr, 1834 de las Canarias orientales, islas Salvajes y Marruecos (Coleoptera, Curculionidae, Entiminae)  [cached]
Machado, A.
Graellsia , 2011,
Abstract: This contribution to the knowledge of the genus Laparocerus Schoenherr, 1834 in Macaronesia concerns species from the Eastern Canaries, Salvage Islands and Morocco. Laparocerus rasus Wollaston, 1864 is redescribed and two new subspecies localised in Fuerteventura are ascribed to it: L. rasus betancor n. spp. and L. rasus jandiensis n. ssp. Several new species are described from that same island: L. maxorata n. sp., L. colonnellii n. sp., L. calvus n. sp., L. xericola n. sp., L. fraterculus n. sp., and L. longipennis n. sp.; from the island of Lanzarote L. curvipes famara n. ssp., and from the Selvage Islands L. garretai albosquamosus n. spp. The only confirmed species form Morocco, Laparocerus susicus (Escalera, 1914), is redescribed and L. susicus montanus n. spp., from the interior, and L. susicus inexpectatus nov. nom., from the coastal region of Tiznit are assigned to it. A retro-colonization from the Canary Islands to the continent is hypothesized for this Moroccan species. Doubtful records and unresolved species are commented on, and keys in Spanish and English for identifying all Laparocerus inhabiting this geographical context are provided. Esta contribución al conocimiento del género Laparocerus Schoenherr, 1834 está dedicada a las Canarias orientales, islas Salvajes y Marruecos. Se redescribe Laparocerus rasus Wollaston, 1864 y se le asignan dos nuevas subespecies localizadas en Fuerteventura: L. rasus betancor n. spp. y L. rasus jandiensis n. ssp. De esta misma isla se describen varias especies nuevas: L. maxorata n. sp., L. colonnellii n. sp., L. calvus, n. sp., L. xericola n. sp., L. fraterculus n. sp. y L. longipennis n. sp.; de la isla de Lanzarote L. curvipes famara n. ssp., y de las islas Salvajes L. garretai albosquamosus n. spp. Se redescribe la única especie confirmada de Marruecos, Laparocerus susicus (Escalera, 1914), a la que se adscriben L. susicus montanus n. spp., del interior, y L. susicus inexpectatus nom. nov.), de la región costera de Tiznit. Para la especie marroquí se plantea la hipótesis de una retrocolonización a partir de las islas Canarias, a la vez que se comentan algunas citas dudosas y ejemplares cuya atribución específica queda pendiente de resolver. Se aportan claves en espa ol e inglés para separar los Laparocerus conocidos de este ámbito geográfico
Pronounced Fixation, Strong Population Differentiation and Complex Population History in the Canary Islands Blue Tit Subspecies Complex  [PDF]
Bengt Hansson, Marcus Ljungqvist, Juan-Carlos Illera, Laura Kvist
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090186
Abstract: Evolutionary molecular studies of island radiations may lead to insights in the role of vicariance, founder events, population size and drift in the processes of population differentiation. We evaluate the degree of population genetic differentiation and fixation of the Canary Islands blue tit subspecies complex using microsatellite markers and aim to get insights in the population history using coalescence based methods. The Canary Island populations were strongly genetically differentiated and had reduced diversity with pronounced fixation including many private alleles. In population structure models, the relationship between the central island populations (La Gomera, Tenerife and Gran Canaria) and El Hierro was difficult to disentangle whereas the two European populations showed consistent clustering, the two eastern islands (Fuerteventura and Lanzarote) and Morocco weak clustering, and La Palma a consistent unique lineage. Coalescence based models suggested that the European mainland forms an outgroup to the Afrocanarian population, a split between the western island group (La Palma and El Hierro) and the central island group, and recent splits between the three central islands, and between the two eastern islands and Morocco, respectively. It is clear that strong genetic drift and low level of concurrent gene flow among populations have shaped complex allelic patterns of fixation and skewed frequencies over the archipelago. However, understanding the population history remains challenging; in particular, the pattern of extreme divergence with low genetic diversity and yet unique genetic material in the Canary Island system requires an explanation. A potential scenario is population contractions of a historically large and genetically variable Afrocanarian population, with vicariance and drift following in the wake. The suggestion from sequence-based analyses of a Pleistocene extinction of a substantial part of North Africa and a Pleistocene/Holocene eastward re-colonisation of western North Africa from the Canaries remains possible.
Distribution and genetic variation of hymenolepidid cestodes in murid rodents on the Canary Islands (Spain)
Pilar Foronda, Mercedes López-González, Mariano Hernández, Voitto Haukisalmi, Carlos Feliu
Parasites & Vectors , 2011, DOI: 10.1186/1756-3305-4-185
Abstract: Three species of hymenolepidids were identified: Hymenolepis diminuta, Rodentolepis microstoma and Rodentolepis fraterna. Hymenolepis diminuta (in rats) and R. microstoma (in mice) showed a widespread distribution in the Archipelago, and R. fraterna was the least spread species, appearing only on five of the islands. The hymenolepidids found on Fuerteventura, Lanzarote and La Graciosa were restricted to one area. The COI network of H. diminuta showed that the haplotypes from Lanzarote and Fuerteventura are the most distant with respect to the other islands, but clearly related among them.Founder effects and biotic and abiotic factors could have played important role in the presence/absence of the hymenolepidid species in determined locations. The haplotypes from the eastern islands (Fuerteventura and Lanzarote) seem to have shared an ancestral haplotype very distant from the most frequent one that was found in the rest of the islands. Two colonization events or a single event with subsequent isolation and reduced gene flow between western-central and eastern islands, have taken place in the Archipelago. The three tapeworms detected are zoonotic species, and their presence among rodents from this Archipelago suggests a potential health risk to human via environmental contamination in high risk areas. However, the relatively low prevalence of infestations detected and the focal distribution of some of these species on certain islands reduce the general transmission risk to human.Cestodes of the family Hymenolepididae (Cyclophyllidea) are ubiquitous and parasites from diverse birds, rodents, insectivores, Chiroptera and some other mammals. According to Czaplinski and Vaucher [1], there are ca. 230 and 620 species of hymenolepidids parasitizing mammals and birds, respectively. Some of the hymenolepidid species of rodents are of health interest, since they are zoonotic and can cause severe diseases in immunosuppressed individuals [2-4].The Canary Islands are considered a
Islam et mondialisation  [cached]
Yadh Ben Achour
Scienza & Politica : per una Storia delle Dottrine , 2008, DOI: 10.6092/issn.1825-9618/2781
Abstract: Islam et mondialisation
Tendencias poblacionales recientes de la avutarda hubara en las Islas Canarias: análisis metodológico y estado de conservación  [PDF]
Schuster, C.,Iglesias–Lebrija, J. J.,Carrascal, L. M.
Animal Biodiversity and Conservation , 2012,
Abstract: Recent population trends of the houbara bustard in the Canary Islands. Methods and conservation statusDetermining conservation status requires rigorous and reliable data about population sizes and trends, especially if they have to be applied to islands where the species have small populations. The Canary bustard houbara (Chlamydotis undulata fuertaventurae) is catalogued as ‘in danger’ by the Red Book of the Birds of Spain. This work analyzes the value of previously published information on the species using the method of adjacent linear transects separated by 200 m, as a baseline for establishing robust population trends in 30 important areas (ranging from 1.3 to 12.8 km2) for the houbara in the islands of Lanzarote and Fuerteventura (Canary Islands). Censuses were repeated on the same dates (from November to December) and localities as those carried out in 1994, 2004 and 2006. The detection probability of the houbara was estimated by means of distance sampling, being 0.42 up to 250 m from the observer, and 0.82 in the main census belt of 100 m on either side of the line transect. The method of adjacent linear transects —counting the maximum number of hubaras detected— provides accurate figures of population densities (detection of 95.2% of the birds). The previous estimations of houbara densities can therefore be considered highly trustworthy, with a probable average underestimation of only 5 %. Nevertheless, the confidence intervals of density estimations using only one census were very large. Therefore, with only one census per sampling area and year it is not possible to obtain precise estimates of houbara densities with small variation around the average value. This raises concern when trying to obtain solid evidence about the increases–decreases of houbara populations comparing different dates or study areas. The density of the Canary Island hubara bustard decreased significantly from 2004/2006 to 2011 in eight areas of Fuerteventura (Vega Vieja, Los Alares–Pocetas, Matas Blancas, Lorenzo– Diviso, Corralejo, Lajares and Fimapaire) and in two areas of Lanzarote (Argana and La Santa). Conversely, the density of the houbara significantly increased in three areas of Lanzarote (Zonzamas, Guatiza and Llano de las Maretas). As a whole, average population density did not differ significantly between 2004/2006 and 2011 in Fuerteventura (slight decrease of 29% in 2011), but there was a significant increase in Lanzarote (increase of 60% from 2004/2006 to 2011). The change in density from 2004/2006 to 2011 tended to be an increase in areas further from pave
Données nouvelles sur le Néogène et le Quaternaire des escarpements ioniens (Méditerranée orientale) New Data on the Neogene and Quaternary in Lonian Scarps (Eastern Mediterranean)  [cached]
Bizon G.,Bizon J. J.,Biju-Duval B.,Borsetti A. M.
Oil & Gas Science and Technology , 2006, DOI: 10.2516/ogst:1983035
Abstract: Les études micropaléontologiques réalisées sur les échantillons prélevés soit par dragage, soit avec le bras articulé de la soucoupe plongeante Cyana apportent des résultats nouveaux sur la stratigraphie du Néogène en mer Ionienne et sur l'interprétation paléobathymétrique des associations faunistiques. Si le Miocène reste encore mal caractérisé, toutes les zones du Pliocène (MPL1 à MPL6) ont été reconnues. Les cotes des différents prélèvements et la faible puissance de chaque série qui leur permet d'affleurer en différents points des escarpements rendent probable un mécanisme de dép t sur une pente préexistante. Les échantillons quaternaires très nombreux sont souvent caractérisés par la formation de cro tes ou par leur lithification complète. L'étude des vases holocènes a montré des associations relativement peu diversifiées. Ceci semble lié beaucoup plus à une stratification permanente des eaux entra nant une diminution de la teneur en oxygène et en éléments nutritifs qu'à d'autres facteurs comme la température ou la salinité. Micropaleontological analyses of samples taken either by dredging or by the articulated arm of the Cyana have provided new findings on the submersible Neogene stratigraphy of the lonian Sea and on the paleobathymetric interpretation of faunistic associations. Although the Miocene has not yet been fully characterized, all the Pliocene zones (MPL1 to MPL6) have been recognized. The depths of the different samples and the shallowness of each series outcropping at different points in the scarps make a deposit mechanism probable on a preexisting slope. The very numerous Quaternary samples are often characterized by crust formation or by complete lithification. An analysis of Holocene muds has shown relatively little diversified associations. This seems linked much more to a permanent stratification of the waters, causing a decrease in the oxygen content and in the nutritive elements, than to other factors such as temperature or salinity.
Contribution à l’étude des couleurs anciennes extérieures et intérieures de croisées de menuiseries des xviie et xviiie siècles, à Paris et Versailles ville Contribution to the survey of old exterior and interior colours in muntin bars dating from the seventeenth and eighteenth centuries, in Paris and the town of Versailles  [cached]
Frédérique Vouvé
Bulletin du Centre de recherche du chateau de Versailles , 2008, DOI: 10.4000/crcv.1752
Abstract: Cette démarche a été initiée par Claude Landes, expert en croisées anciennes, et par le LERM, spécialisé dans la caractérisation et le diagnostic des métaux anciens. Grace aux recherches conjointes entreprises et au protocole d’échantillonnage mis au point par M. Landes, nous sommes en mesure, sur une croisée de menuiseries des xviie et xviiie siècles, d’identifier les matériaux constitutifs de la première mise en peinture réalisée sur celle-ci. à partir d’un examen détaillé de la stratigraphie de plusieurs échantillons, nous avons caractérisé les pigments, charges et liants mis en uvre dans les strates les plus anciennes. Ces analyses ont été complétées par des mesures de colorimétrie. Ces recherches peuvent être entreprises d’un point de vue qualitatif et semi-quantitatif. Dans ce second cas, il est ainsi possible de remonter à une formulation proche de l’originelle, ce qui permet d’envisager une reconstitution à l’identique des couleurs extérieures de ces croisées. L’exposé sera illustré par les résultats obtenus après une étude des polychromies extérieures de l’h tel d’Hallwyl (Paris, IIIe arrondissement), du 17, rue Champollion (Paris, Ve arrondissement), de l’ancien h tel de Mayenne (Paris, IVe arrondissement), enfin du 10, avenue de Sceaux à Versailles ville. This project was set up by Claude Landes, an expert on old muntins, and the LERM, specialized in the characterization and diagnostic of old metals. Thanks to common research undertaken and to the sampling protocol set up by M. Landes, it is possible to identify the materials constituting the original paintwork on muntins from the seventeenth and eighteenth centuries. From detailed examination of the stratigraphy of several samples, we have characterized the pigments, fillers and binders used in the oldest layers. These analyses have been completed with colourimetric measurements. This research may be carried out from a qualititative and semi-quantitative point of view. In the latter case, it is possible to establish a composition close to the original, enabling the exterior colours of these muntins to be reproduced exactly as they were. The exposé is illustrated by results obtained from a survey of the exterior polychrome work on the H tel d’Hallwyl (Paris, 3rd arrondissement), number 17, rue Champollion (Paris, 5th arrondissement), the former H tel de Mayenne (Paris, 4th arrondissement), and number 10, avenue de Sceaux in the town of Versailles.
Matador - et kig ind gadespejlet
Nanna Frost,Holger Knudsen,Sine Dalsgaard Kristensen,Peter Rosenlund S?rensen
Massekultur & Medier , 1981,
Abstract: Matador - et kig ind gadespejlet
Glossaire et index des sigles  [PDF]
Florence Naaim-Bouvet
Sciences Eaux & Territoires : la Revue du IRSTEA , 2010,
Abstract: Glossaire et index des sigles.
Iberian-Tartessian scripts/graffiti in Iruna-Veleia (Basque Country, North Spain): findings in both Iberia and Canary Islands-Africa
A Arnaiz-Villena, D Rey
International Journal of Modern Anthropology , 2012,
Abstract: 760 officially recognized scripts on ceramics from Iru a-Veleia excavated by the archaeology firm Lurmen S.L. (approximately between years 2002-2008)have been analyzed. A number of these ceramics contains scripts which may be assimilated to Iberian/Tartessian writings. This number may be underestimated since more studies need to be done in already available and new found ceramics. This is the second time that Iberian writing is found by us in an unexpected location together with the Iberian-Guanche inscriptions of Lanzarote and Fuerteventura (Canary Islands). On the other hand, naviform scripting, usually associated to Iberian rock or stone engraving may have also been found in Veleia. Strict separation, other than in time and space stratification, between Iberian and (South) Tartessian culture and script is doubted.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.