300,051 research outputs found
Environmental niche and global potential distribution of the giant resin bee Megachile sculpturalis, a rapidly spreading invasive pollinator
No full textSince alien species may threaten native ecosystems when becoming invasive, one of the main challenges is try to predict their potential spread. Despite bees are essential pollinators and provide important ecosystem services in their native areas, outside these areas they could represent a risk for the local bee fauna, e.g. by competing for resources or by transmitting pathogens, as it was observed for species of Megachile, the bee genus with the highest number of recorded alien species. Here, using two complementary methods (Multidimensional Envelope procedure (MDE) and the Maximum Entropy algorithm (MaxEnt)), we aim to explore environmental niche as well as to identify potential worldwide distribution of the giant resin bee Megachile sculpturalis, native to Asia and recently introduced in North America and Europe. The two methodological approaches predict an important expansion for the species and reveal a preference for areas of Palearctic and Nearctic regions with reduced temperature fluctuations and moderate precipitation regimes. The Southern hemisphere seems not having good conditions for this species. Estimations for the future (2070) predict a further, though limited expansion to northern areas in the North hemisphere. However, during roughly 25 years of spreading outside its native range, M. sculpturalis clearly expanded the range of inhabitable environmental conditions, which may increase its potential invasiveness in a pattern difficult to predict using only correlative methods. Physiological and ecological data are necessary to better assess the potential niche of this bee species and in consequence to better predict its future spreading dynamics
L'evoluzione della giurisprudemza della Cprte di Giustizia dell'Unione europea in materia di simboli religiosi visibili nel posto di lavoro. A proposito del divieto dell'uso del velo e contratto di lavoro in CGUE C-804/18 e C-341/19
No full textThe article analyses the position of the CJUE in front of the neutrality policy adopted by a private company in a sentence of July 15, 2021. The importance of this sentence is
the existence of two Opinions contradictory, one in 2019 of the first Advocate General, Eleanor Sharpston, who was however delayed and was reallocated to her successor Advocate General Athanasions Rantos on 10 Septembre 2020El artículo realiza un análisis de la posición de la CJUE frente a la política de neutralidad adoptada por una empresa en una sentencia de 15 de julio de 2021. La importancia de esta sentencia es la existencia de dos informes contrapuestos, uno de 2019 de la primera abogada general, Eleanor Sharpston, que después ha sido sustituida el 10 de septiembre de 2020 por el del abogado general, Athanasios Ranto
Operators invariant under finitely many input changes with applications to aggregation of sequences
No full textIn the framework of finitely additive measures defined on the power set of an infinite set X, we consider related operators defined on bounded functions on X invariant under finitely many changes of input values. Specifically, we reconsider these operators with an extended use of the concept of filter, which provides novel insights into the problem. Then, we apply the obtained results to the study of the aggregation of infinite sequences
Sanchez, C.
No full textCentro Asturiano membership record of C. Sanchez; Socio Number: 85543.https://digitalcommons.usf.edu/asturiano_membership/5308/thumbnail.jp
Libertad religiosaa y politica de neutralidad empresarial. A la luz de la sentencia del TJUE de 13 de octubre de 2022 (C-344/20)
No full textThis article analyzes the case law of the Court of Justice of the European Union (CJEU) on the company’s strict policy of neutrality, which prohibits the use of signs of political, philosophical or religious beliefs in the workplace. The latest judgment highlights the thought of the European judge on the legitimacy of this policy without it being considered a direct discrimination if the internal rule is applied in a general and indiscriminate way
Fernandez, C.
No full textCentro Asturiano membership record of C. Fernandez; Socio Number: 84939.https://digitalcommons.usf.edu/asturiano_membership/2591/thumbnail.jp
Isotope effects in the kinetics of simultaneous H and D thermal desorption from Pd
No full textThe kinetics of simultaneous hydrogen and deuterium thermal desorption from PdHxDy has been investigated. A novel experimental approach for the study of the transition state (TS) characteristics of the surface recombination reaction is proposed based on the analysis of the H and D partitioning into H-2, HD and D-2 molecules. It has been found that the hydrogen molecular isotopes distribution is determined by the energy differences of the corresponding TS of the atom-atom recombination reactions. On the other hand, the mechanisms and activation energies of the desorption process have been obtained. At 420 K, the desorption reaction changes from a surface recombination limiting mechanism during desorption from beta-PdHxDy to a reaction limited by the rate of beta to alpha phase transformation during the two phase coexistence. Surface recombination reaction becomes again rate limiting above 480 K, due to a change in the catalytic properties of the Pd surface. TS energies obtained from the kinetic analysis of the thermal desorption spectra are in good accordance with those obtained from the analysis of the H-2, HD and D-2 distributions. Anomalous TS energies have been observed for the H-D recombination reaction, which may be related to the heteronuclear character of this molecule. (C) 2007 Elsevier Ltd. All rights reserved
Fernandez, Amparo C.
No full textCentro Asturiano membership record of Amparo C. Fernandez; Socio Number: 122.https://digitalcommons.usf.edu/asturiano_membership/2681/thumbnail.jp
Climate change-driven body size shrinking in a social wasp
No full text1. Climate change is expected to produce shifts in species distributions as well as behavioural, life-history, and/or morphological adaptations to find suitable conditions or cope with the altered environment. Most of our knowledge on this issue comes from studies on vertebrates, mainly endotherm species. However, it remains uncertain how small ectotherms, such as insects, respond to increased temperature. 2. This study tested whether climate change over the last 100 years (1904–2013) has affected morphological and functional traits in workers of the social wasp Dolichovespula sylvestris in the Iberian Peninsula. 3. Head width and forewing length, as well as body mass and wing area (assuming no change in shape), decreased over time and with increased mean annual temperature, even when controlling for geographical location and altitude. Interestingly, wing size decreased with a steeper slope compared with body size. If there is no change in wing shape, this would lead to an invariable wing loading (body mass:wing area ratio) over time, with potential consequences on flying ability of more recent (and thus smaller) wasp individuals. 4. These results suggest that recent climate change is leaving morphological signatures in social wasps, increasing the evidence for this phenomenon in insects. The data furthermore suggest that the known efficient thermoregulatory ability of social insect colonies may not successfully buffer the effect of global warming
Juan C. Sanchez and Frances V. Sanchez (July 26, 1972)
No full textJuan Sanchez was a bank employee who regularly encountered Frank Milhous
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