Ingenieria Y Economia Del Transporte

Abstract Host defence against parasites can include limiting parasite growth, ‘resistance’, limiting the mortality cost of infection, ‘mortality tolerance’, and limiting the reproductive cost of infection, ‘fecundity tolerance’. Theoretically, these three host strategies have very different epidemiological and evolutionary outcomes. In particular, because mortality tolerance increases parasite population size, it is under strong positive frequency-dependent selection and may therefore be less variable between populations than either resistance or fecundity tolerance. Additionally, host investment in each strategy can be expected to differ between populations that experience different ecological conditions. Here, we tested how populations of Trinidadian guppies Poecilia reticulata from the upper and lower courses of three rivers responded to experimental infection with a novel strain of Gyrodactylus turnbulli . In line with theoretical predictions, we found that lower course populations, previously shown to have faster paces of life, invested less in resistance and fecundity tolerance - but not mortality tolerance - than the upper course populations with slower paces of life. Our results indicate that this host-parasite interaction both conforms to evolutionary-epidemiological theoretical predictions, and is shaped by broader ecological conditions.

Cryptic species offer opportunities to reveal the mechanisms that constrain phenotypic divergence during speciation. We integrated whole-genome sequencing, morphological, micro- and macro-climatic, and behavioral data to investigate divergence across a well-documented genetic break in the desert-adapted side-blotched lizard, Uta stansburiana, on the Baja California peninsula. Despite deep genomic differentiation, clades show remarkable similarity in morphology, habitat use, and thermal biology. Nearly all genetic differentiation (87%) is explained by isolation by distance and seasonal variation in precipitation, with almost no effect of temperature. Behavioral thermoregulation and changes in activity time accommodate strong macro- and micro-climatic differences, buffering against selection that would otherwise drive morphological and physiological divergence. In contrast, genomic signatures of selection and divergence in genes associated with the nervous system, sensory perception, and biomolecule metabolism indicate adaptation to differences in rainfall seasonality. The results show behavioral flexibility can constrain phenotypic divergence, yielding cryptic species-level genetic divergence despite strong eco-climatic disparities and selection pressures. More broadly, this study shows how rigorous statistical integration of multiple data types can disentangle competing eco-climatic drivers that can decouple phenotype from genotype during speciation.

Los mamíferos del valle de Perote enfrentan continuas e intensas presiones antrópicas que comprometen su existencia. Algunas de sus especies se encuentran en riesgo de desaparecer mientras que otras no han logrado persistir.

Background: A study was conducted in the locality of El Fuerte (Santa Bárbara Department, Jujuy Province, Argentina). The objectives of this work were to (1) document the ethnospecies of plants used by local people, (2) understand their consensus for use and utilitarian versatility, (3) determine harvesting sites, and (4) assess the availability of plants used based on local perceptions. Methods: Open and semi-structured interviews were conducted to 11 collaborators, along with free listing, participant observation and species identification in the field. Results: A total of 124 ethnospecies were identified, of which 59% are native species, used for medicinal purposes (36%) and as food (33%). The most frequently mentioned botanical families across all species were Lamiaceae (19%), Rosaceae (16%), Fabaceae (14%), Asteraceae (12%), and Myrtaceae (9%). The species with the highest consensus for use were piquillín (Condalia cf. buxifolia) and mato (Myrcianthes pungens) and the most versatile of use were piquillín and molle (Schinus sp.). The plants were obtained from environments with both high (town) and low (forest) human intervention. Local people's perceptions of the availability of some plants indicate a decrease in terms of quantity. Conclusions: This is a first approach to study local ecological knowledge in the region, providing a general overview of the useful plants employed by its inhabitants. These findings aim to strengthen biocultural conservation of forests, promote sustainable resource management and offer economic alternatives for local people. Keywords: useful plants, ethnoconservation, native forest, Northwestern Argentina.

Background: This article provides an assessment of the sustainability of Russian regions’ financial systems. The study is based on the methods of generalization and synthesis, correlation-regression analysis, and multivariate classification. Since the structure of the regional financial system is complex, several works are devoted to studying its sustainability issues. The relevance of the study topic is confirmed by the lack of a systematic approach to assessing the integral index of sustainability and the possibility of using various tools in determining the complex indicator.Methods: This methodology with application of mathematical statistics methods makes it possible to assess the financial system sustainability in four sectors, to include the leading indicators in the assessment, and to identify regions with extreme values of debt burden indicators. The method was tested for the regions of the Northwestern Federal District (NWFD) for the period 2010 - 2019 to classify the regions according to three levels of debt sustainability. Data collection from the 1st January to 30th April 2022 included statistical data from government open internet sources, sectors studied relate to government, and municipal budgets in the NWFD. Authors analyzed regional debt sustainability indicators and identified themes in the field of sustainability studies for the NWFD.Results: An increased level of financial system sustainability was observed among the NWFD regions in the corporative and personal finance sectors, indicating a significant contribution of businesses and households to maintaining the balance and sustainability of the financial system in Russia as a whole. The results of the study also identified that the NWFD regions belong to three clusters: cluster 1 - high debt sustainability; cluster 2 - medium debt sustainability; and cluster 3 - low debt sustainability.Conclusions: The study results allowed the identification of regions with a constantly high level of debt, financial, and corporative sustainability.

Background: The ongoing COVID-19 quarantine restrictions have caused multiple sharp decreases in activities associated with the movement of large masses of people. The economies of regions and cities that are critically dependent on tourist flows related to various segments have suffered. This research aims to provide an economic-mathematical model of smart cities externalities' impact from the point of view of achieving social and environmental goals Methods: The objective of this study was to develop an algorithm for supporting decision-makers. Methods of mathematical modeling, statistical processing of data received in real-time, as well as methods for finding solutions by expansion into dynamic series are used, and the theory of mathematical games is applied. The theoretical mathematical model presented considers the statistical processing of data provided in real time referring to the performance indicators of megacities. Results: The activities of administrations and governments aimed at maintaining stability over the past two years have been aimed at reducing the negative impact of the pandemic. The prospect of returning to normal conditions is complicated by a number of factors. The proposed approach allows the development of the fundamental basis for making administrative decisions within individual megapolises and in environmental policy on a territory of any scale. The developed mathematical model is abstract by definition and is applied by taking into account specific tasks and criteria. Since the tasks of the administration differ depending on the region and country, the choice of criteria is set individually. Conclusions: During the period of isolation, the volume of services in the Hotel - Restaurant- Catering/Café (HORECA) segment has decreased, and personnel has also been lost. The reduced pressure on public infrastructure and the departure of migrants means that, in the long term, this work cannot be restored within a short period of time.

Introducción: El conocimiento de la riqueza vegetal y la estacionalidad alrededor de los apiarios de Apis mellifera es una herramienta de planificación indispensable para los apicultores. Debe incluir la disponibilidad de recursos, las preferencias alimenticias y el comportamiento de búsqueda de alimento. Dicha información no está disponible para las Yungas argentinas, uno de los ecosistemas forestales más estacionales de América del Sur. Objetivo: Evaluar la disponibilidad de recursos tróficos a través de un calendario de floración y su relación con las cargas de polen de A. mellifera en las Yungas. Métodos: En El Fuerte, Jujuy, recolectamos muestras mensuales de septiembre a marzo (2014-2015 y 2015-2016) utilizando trampas de polen. Utilizamos técnicas estandarizadas para los análisis palinológicos e índices de asociación para el uso de recursos. Las fenofases fueron Inicio de floración, Plena floración y Fin de floración. Resultados: Se identificaron 47 especímenes botánicos a nivel de especie y 9 a nivel de género. En ambos períodos hubo una oferta moderada de flores al inicio de la primavera, representada igualmente por plantas arbustivas y herbáceas, con un pico de floración en noviembre. Posteriormente, hubo una caída en la disponibilidad, con un pico de floración nuevamente al final de la temporada. En cinco especies de plantas hubo una asociación de media a alta entre la especie vegetal disponible y la presencia de ésta en el espectro polínico de la muestra de polen corbicular recolectada (Vachellia aroma, Blepharocalyx salicifolius, Cantinoa sp., Vernonanthura sp. y Zanthoxylum coco). Conclusión: En esta región hay una oferta moderada de flores de plantas arbustivas y herbáceas a principios de la primavera, con un pico de floración en noviembre y al final de la temporada. Solo cinco, de casi 50 especies de plantas, muestran una asociación de disponibilidad y uso por parte de las abejas.

A través del presente trabajo se analiza la implementación de la Competencia Transversal “Comprensión e integración” en las asignaturas de los estudios de Gestión y Administración Pública en las que se está evaluando. Se tiene presente que el nivel de dominio de la competencia no puede ser el mismo para los alumnos de 1º y 2º, a los que correspondería el nivel 1 de la competencia, que para los alumnos de 3º y 4º a los que correponde un nivel superior 2. Se concluye que las metodologías empleadas son muy diferentes por lo que se puede inferir que la evaluación global es correcta.