Caracterización geoquímica preliminar de los metatasedimentos ordovicicos del sinforme de Alcanices (Zamora)

The geochemistry of the Ordovician metasediments and associated Fe sedimentary mineralizations of the South limb of the Alcañices Synform suggest a siliceous nature for the Cabeza de las Viñas (pre-Arenigian) and Pielgo Quartzite (Arenigian) Formations as compared with the essentially aluminic character of the Latedo (Llanvirnian-Llandeilian) Formation and a sediment essentially formed of Fe oxyhydroxides, quartz and clay minerals as precursors of the Fe mineralizations.La caracterización geoquímica de los metasedimentos ordovícicos y mineralizaciones sedimentarias de Fe asociadas del flanco S del Sinforme de Alcañices permite establecer que, las formaciones Cabeza de las Viñas (infra-Arenig) y Cuarcitas del Pielgo (Arenig) son de naturaleza silícea frente a la esencialmente alumínica de la Fm. Latedo (Llanvirn-Llandeilo) y, un sedimento constituido esencialmente por oxi-hidróxidos de Fe, cuarzo y minerales arcillosos como precursor de las mineralizaciones de Fe

Genomic signatures of drift and selection driven by predation and human pressure in an insular lizard

Genomic divergence was studied in 10 small insular populations of the endangered Balearic Islands lizard (Podarcis lilfordi) using double digest restriction-site associated DNA sequencing. The objectives were to establish levels of divergence among populations, investigate the impact of population size on genetic variability and to evaluate the role of different environmental factors on local adaptation. Analyses of 72,846 SNPs supported a highly differentiated genetic structure, being the populations with the lowest population size (Porros, Foradada and Esclatasang islets) the most divergent, indicative of greater genetic drift. Outlier tests identified ~ 2% of loci as candidates for selection. Genomic divergence-Enviroment Association analyses were performed using redundancy analyses based on SNPs putatively under selection, detecting predation and human pressure as the environmental variables with the greatest explanatory power. Geographical distributions of populations and environmental factors appear to be fundamental drivers of divergence. These results support the combined role of genetic drift and divergent selection in shaping the genetic structure of these endemic island lizard populations

Search for new phenomena in monophoton final states in proton-proton collisions at root s=8 TeV

Peer reviewe

Mineralogical study of the silurían variscites and turquoises of Punta Corveiro (Pontevedra, Spain)

In this paper we resume the geological and essential mineralogical characteristics of the phosphated mineralization found in the Silurian of W sector in the Pontevedra province, in "Punta Corveiro", south of La Lanzada beach. The mineralization appears in centimetric fractures in a level of black quartzites, shales and lidites, and consists of variscile, turquoise and occasionally crandallite and quartz. The mineralogical and chemical characteristics of these minerals have been determined by polarized microscope, X-ray diffraction (XRD) and electron microprobe (EDAX

Neoformation of barite in The Villamayor sdndslone (Salamanca). Preliminary study

The barite studied in the Villamayor sandstone is located in old rhizoliths related to subvertical fractures which affect these subarcosic deposits. These zones are actually in great circulation within underground waters and full of clay materials. The mineral's form together with ist mineralogical, chemical and isotopic characteristics suggests that its formation is related with the postneogene alteration processes (caolinitization) of sandstones which liberate Ba of the feldspars and with the infiltration and circulation of metheoric waters that contain dissolved sulphate

Phylogenetic, Microbiome, and Diet Characterisation of Wall Lizards in the Columbretes Archipelago (Spain): Clues for Their Conservation

[eng] The Columbretes archipelago consists of a group of small volcanic islets located in the western Mediterranean near the east of the Iberian Peninsula. Four of its islands are inhabited by the wall lizard Podarcis liolepis, whose populations have been considered vulnerable. The purpose of this study was to assess the level of genetic diversity across the archipelago and the possible evolutionary origin of the Columbretes lizard populations. Additionally, we investigated the evolutionary ecology of these populations using a DNA-based metabarcoding approach to characterise both their microbiota and trophic interactions. The genetic results reported very low genetic diversity and corroborated the conspecificity between insular populations and P. liolepis from the mainland (Peñagolosa region). The results of the metabarcoding analyses based on faecal samples were in accordance with an omnivorous ecology, suggesting that specific microbiota communities in the insular populations might be correlated with differences in host ecology and phylogeny. These results are a valuable contribution to the current understanding of the evolution of Columbretes' lizards and provide important information for conservation management

Multilocus and morphological analysis of south-eastern Iberian Wall lizards (Squamata, Podarcis)

[eng The phylogenetic relationships among the wall lizards of the Podarcis hispanicus complex that inhabit the south-east (SE) of the Iberian Peninsula and other lineages of the complex remain unclear. In this study, four mitochondrial and two nuclear markers were used to study genetic relationships within this complex. The phylogenetic analyses based on mtDNA gene trees constructed with ML and BI, and a species tree using *BEAST support three divergent clades in this region: the Valencia, Galera and Albacete/Murcia lineages. These three lineages were also corroborated in species delimitation analyses based on mtDNA using bPTP, mPTP, GMYC, ABGD and BAPS. Bayesian inference species delimitation method (BPP) based on both nuclear data and a combined data set (mtDNA + nuclear) showed high posterior probabilities for these three SE lineages (≥0.94) and another Bayesian analysis (STACEY) based on combined data set recovered the same three groups in this region. Divergence time dating of the species tree provided an estimated divergence of the Galera lineage from the other SE group (Podarcis vaucheri, (Albacete/Murcia, Valencia)) at 12.48 Ma. During this period, the Betic-Rifian arc was isolated, which could have caused the isolation of the Galera form distributed to the south of the Betic Corridor. Although lizards from the Albacete/Murcia and Galera lineage are morphologically similar, they clearly represent distinct genetic lineages. The noteworthy separation of the Galera lineage enables us to conclude that this lineage must be considered as a new full species