Search results for " Population"
showing 10 items of 1682 documents
Patterns and causes of incongruence between plastid and nuclear Senecioneae (Asteraceae) phylogenies
2010
One of the longstanding questions in phylogenetic systematics is how to address incongruence among phylogenies obtained from multiple markers and how to determine the causes. This study presents a detailed analysis of incongruent patterns between plastid and ITS/ETS phylogenies of Tribe Senecioneae (Asteraceae). This approach revealed widespread and strongly supported incongruence, which complicates conclusions about evolutionary relationships at all taxonomic levels. The patterns of incongruence that were resolved suggest that incomplete lineage sorting (ILS) and/or ancient hybridization are the most likely explanations. These phenomena are, however, extremely difficult to distinguish beca…
Comparative evolution of P–M system and infection by the sigma virus in French and Spanish populations ofDrosophila melanogaster
1992
SummaryIn 1983, an extensive survey of populations ofD. melanogasterwas started in a southern French region (Languedoc) in two non-Mendelian systems: the P–M system of transposable elements and the hereditary Rhabdovirus sigma. Unexpectedly fast-evolving phenomena were observed and interesting correlations were noted, giving similar geographical pattern to the region in both systems. For these reasons, the analysis was continued and extended towards the north (Rhône Valley) and the south (Spain). In the P–M system, all the Languedoc populations evolved from 1983 to 1991 towards the Q type which is characteristic of the Rhône Valley populations. In contrast, M′ strains are currently observed…
The gut microbiota structure of the terrestrial isopod Porcellionides pruinosus (Isopoda: Oniscidea)
2020
We used a combination of culture-dependent and independent approaches to study in depth the microbial community associated with the digestive tract of the terrestrial isopod Porcellionides pruinosus (Brandt, 1833). Specimens from different sampling sites in Tunisia harbored distinct microbiota profiles indicating the impact of both host origin and environmental factors on shaping the microbial flora within P. pruinosus. Our results revealed unexpected bacterial diversity especially via metagenomic analysis; a total of 819 operational taxonomic units (OTUs) assigned to two major bacterial phyla; Proteobacteria and Bacteroidetes. We used Nutrient Agar to isolate the cultivable fraction of bac…
Genética de la conservación: la aplicación de los conceptos de la evolución a la conservación de la diversidad biológica
2013
La comprensión de las fuerzas de cambio evolutivo que actúan sobre las poblaciones, en conjunción con las técnicas más modernas de análisis genético, lleva aplicándose en los últimos veinte años al servicio de la conservación de la biodiversidad. Esta nueva aplicación de la genética ha recibido el nombre de genética de la conservación.
The spanish body image state scale: factor structure, reliability and validity in a colombian population
2019
ObjectiveBody image is a construct highly dependent on culture and ethnicity. Furthermore, recent studies reveal that body image is not only a trait, but also a momentary state subject to change in diverse situational contexts. However, cultural influences on momentary body image have not been sufficiently investigated. To assess the influence of Latin American culture on momentary body image and to enable its comparison to Western countries, the Spanish translation of an existing state body image scale such as the Body Image States Scale (BISS) is needed. In addition, the factor structure, reliability and general validity of the Spanish BISS (S-BISS) should be evaluated prior to its applic…
BOVITA: a first overview on genome-wide genetic diversity of Italian autochthonous cattle breeds
2017
On the origin and diversification of Podolian cattle breeds: testing scenarios of European colonization using genome-wide SNP data
2021
AbstractBackgroundDuring the Neolithic expansion, cattle accompanied humans and spread from their domestication centres to colonize the ancient world. In addition, European cattle occasionally intermingled with both indicine cattle and local aurochs resulting in an exclusive pattern of genetic diversity. Among the most ancient European cattle are breeds that belong to the so-called Podolian trunk, the history of which is still not well established. Here, we used genome-wide single nucleotide polymorphism (SNP) data on 806 individuals belonging to 36 breeds to reconstruct the origin and diversification of Podolian cattle and to provide a reliable scenario of the European colonization, throug…
ABO blood groups and Australia antigen
2008
The distribution of ABO blood in two groups of people with Australia antigen was studied (121 blood donors and 128 patients) and in 3,091 controls was investigated. There was a significant excess of A in comparison with o when the two groups were combined, and when the two groups were tested for (A + B): (AB +O) individually and together, both were found to be statistically significant. The results are discussed.
Pruebas T vs análisis categorial: evolución de la agilidad en los adultos mayores tras dos años de entrenamiento (T test vs categorical analysis: evo…
2020
Entendiendo que entrenar no siempre significa alcanzar la independencia funcional para un adulto mayor (AM), ni desentrenar perderla, se crearon 4 categorías para valorar el efecto a largo plazo de un programa multicomponente físico-cognitivo sobre el nivel de independencia en sus usuarios. Se evaluaron 25 AM sanos (69.74±5.36 años) a lo largo de dos años, considerando 2 periodos de Entrenamiento (E1, E2; 8 meses cada uno) y Desentrenamiento (D1, D2; 3 meses + 1 de evaluación). Se analizó la agilidad (Time Up&Go Test) por su relación con la marcha y la prevención de caídas. Los cambios de categoría entre periodos se analizaron mediante el test exacto de Fisher, seguido de un ANOVA de me…