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Approximating home ranges of humpback and fin whales in Drake Passage and Antarctica

Advances in Polar Science 2020年第4期31卷 248-257页

作者： JoséLuis ORGEIRA facundo alvarez Departamento Biología de los Predadores Tope Instituto Antártico Argentino.Buenos AiresArgentina Programa de pós-graduação em Ecologia e Conservação.Campus de Nova Xavantina.Universidade do Estado de Mato Grosso Brasil

Identifying home ranges—those areas traversed by individuals in their normal foraging,mating,and parenting activities—is an important aspect of cetacean *** these ranges facilitates identification of resource use and *** and humpback whales occur in Antarctica during the austral summer,but information regarding their home ranges is *** opportunistically collected whale sighting data from eight consecutive summer seasons spanning 2010–2017,we approximate the home ranges of humpback and fin whales around Drake Passage(DRA),West of Antarctic Peninsula(WAP),South Shetland Islands(SSI),an area northwest of the Weddell Sea(WED),and around the South Orkney Islands(SOI).Approximate home ranges are identified using Kernel Density Estimation(KDE).Most fin whales occurred north and northwest of the SOI,which suggests that waters near these islands support concentrations of this *** humpback whales were observed around the SSI,but unlike fin whales,their distributions were highly variable in other *** suggests spatial segregation in areas where both species exist such as SOI,SSI,and *** redundancy analysis(pRDA)suggests that the distributions of these species are more affected by spatial variables(latitude,longitude)than by local scale variables such as sea surface temperature and *** study presents a visual approximation of the home ranges of fin and humpback whales,and identifies variation in the effects of space and environmental variables on the distributions of these whales at different spatial scales.

关键词： humpback whale fin whale home range Antarctica Drake Passasge

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A cloud-based platform to predict wind pressure coefficients on buildings

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Building Simulation 2022年第8期15卷 1507-1525页

作者： facundo Bre Juan M.Gimenez Centro de Investigacion de Metodos Computacionales(CIMEC) UNLCONICETPredio"Dr.Alberto Cassano"Colectora Ruta Nacional 168 s/n3000Santa FeArgentina

Natural ventilation(NV)is a key passive strategy to design energy-efficient buildings and improve indoor air ***,accurate modeling of the NV effects is a basic requirement to include this technique during the building design ***,there is an important lack of wind pressure coefficients(CP)data,essential input parameters for NV *** this,there are no simple but still reliable tools to predict CP data on buildings with arbitrary shapes and surrounding conditions,which means a significant limitation to NV modeling in real *** this reason,the present contribution proposes a novel cloud-based platform to predict wind pressure coefficients on *** platform comprises a set of tools for performing fully unattended computational fluid dynamics(CFD)simulations of the atmospheric boundary layer and getting reliable CP data for actual ***-expert decisions throughout the entire workflow are implemented to automatize the generation of the computational domain,the meshing procedure the solution stage,and the post-processing of the *** evaluate the performance of the platform,an exhaustive validation against wind tunnel experimental data is carried out for a wide range of case *** include buildings with openings,balconies,irregular floor-plans,and surrounding urban *** C_(P) results are in close agreement with experimental data,reducing 60%-77% the prediction error on the openings regarding the EnergyPlus *** platform introduced shows being a reliable and practical C_(P) data source for NV modeling in real building design scenarios.

关键词： natural ventilation building simulation airflow network model EnergyPlus wind pressure coefficient computational fluid dynamics

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A compartmental model for antibiotic resistant,bacterial infections over networks

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International Journal of Biomathematics 2020年第1期13卷 39-54页

作者： Damian AKnopoff facundo ATrucccd Centro de Investigation y Estudios de Matematica CONICET FaMAF(UNC) CdrdobaArgentina Argentine RedCross CordobaAigentina

This paper presents a compartmental model for bacterial infections in a population distributed over a network of *** each node,individuals interact,bacteria can be transmitted and the disease may be spread;moreover,the acquisition of bacterial antibiotic resistance is *** addition,nodes are connected through weighted edges,and consequently individuals from different nodes may *** a result,the infection may be propagated over the *** perform an analysis on this propagation as well as numerical simulations in order to illustrate the validity of the model.

关键词： Epidemiology compartmental models antibiotic resistance SIR model.

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Distribution of action movements （DAM）： a descriptor for human action recognition

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Frontiers of Computer Science 2015年第6期9卷 956-965页

作者： Franco RONCHETTI facundo QUIROGA Laura LANZARINI Cesar ESTREBOU Instituto de Investigacion en Informatica III-LIDI Facultad de Informatica Universidad Nacional de La Plata La Plata B 1900AWX Argentina

Human action recognition from skeletal data is an important and active area of research in which the state of the art has not yet achieved near-perfect accuracy on many well- known datasets. In this paper, we introduce the Distribution of Action Movements Descriptor, a novel action descriptor based on the distribution of the directions of the motions of the joints between frames, over the set of all possible mo- tions in the dataset. The descriptor is computed as a normal- ized histogram over a set of representative directions of the joints, which are in turn obtained via clustering. While the descriptor is global in the sense that it represents the overall distribution of movement directions of an action, it is able to partially retain its temporal structure by applying a window- ing scheme. The descriptor, together with performs several state-of-the-art known datasets. a standard classifier, out- techniques on many well-

关键词： human action recognition descriptor Prob-SOM MSRC12 Action3D

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Quantifying the relative importance of direct and indirect effects influencing bird nestling growth

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Integrative Zoology 2022年第3期17卷 408-419页

作者： Luciano N.SEGURA facundo X.PALACIO División Zoología Vertebrados Facultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataBuenos AiresArgentina

Nestling growth parameters are integral components of avian life-history strategies as they are crucial determinants of individual *** many factors impact on nestling growth,the relative contribution of each one is still debated in the *** studies rely on the assumption that each factor directly affects nestling growth,but indirect effects mediated by other factors are usually the rule in *** this study,we present a comprehensive view of both direct and indirect factors affecting nestling growth using the Red-crested Cardinal(Paroaria coronata)as model *** evaluated the relative importance of different habitat(forest structure),biotic interactions(botfly larvae ectoparasitism,number of siblings,hatching order),and temporal factors(time of breeding)on nestling growth parameters in 278 nestlings of 128 nests by using piecewise structural equation *** found that botfly ectoparasitism had the strongest direct effect on nestling growth and,in turn,forest structure increased the probability of botfly ***,the interaction between the number of siblings and hatching order influenced nestling growth,indicating that the first and second nestlings had disproportionately higher growth rates in large than in small *** of breeding also showed a strong positive indirect effect on botfly occurrence,as well as a weak direct positive effect on nestling *** results demonstrate that,under natural conditions,nestling growth is driven by different factors acting not only directly,but also indirectly on this essential life history trait,and that these factors weave a complex web of interrelated variables.

关键词： biotic interactions forest structure Red-crested Cardinal structural equation models time of breeding

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LEFT-RIGHT BROWDER LINEAR RELATIONS AND RIESZ PERTURBATIONS

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Acta Mathematica Scientia 2017年第5期37卷 1437-1452页

作者： Teresa alvarez Department of Mathematics University of Oviedo33007OviedoAsturiasSpain

A closed linear relation T in a Banach space X is called left(resp. right) Fredholm if it is upper(resp. lower) semi Fredholm and its range(resp. null space) is topologically complemented in X. We say that T is left(resp. right) Browder if it is left(resp. right)Fredholm and has a finite ascent(resp. descent). In this paper, we analyze the stability of the left(resp. right) Fredholm and the left(resp. right) Browder linear relations under commuting Riesz operator perturbations. Recent results of Zivkovic et al. to the case of bounded operators are covered.

关键词： left and right Fredholm linear relations left and right Browder linear relations Riesz perturbations

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Linking the hierarchical decision- making process of fruit choice and the phenotypic selection strength on fruit traits by birds

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Journal of Plant Ecology 2017年第4期10卷 713-720页

作者： facundo X.Palacio Juan Manuel Girini Mariano Ordano Fundación Miguel Lillo Miguel Lillo 251CP T4000JFESan Miguel de TucumánTucumánArgentina Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) Argentina Sección Ornitología División Zoología VertebradosFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataPaseo del Bosque s/nCP B1900FWALa PlataBuenos AiresArgentina

Aims Animals in search of fleshy fruits forage mostly according to the number of available fruits and then select individual fruits based on reward quality or advertised subtle *** hierarchical pat-tern of fruit choice would be translated into patterns of selection strength mediated by frugivores on fruit display ***,frugi-vores would exert higher selection pressures on fruit crop size and lower selection pressures on within-plant variation of phenotypic traits(infructescence,fruit and seed size).However,no attempt to link this behavioral mechanism of hierarchical trait selection to natural selection patterns has been ***,we sought to determine the relationship between the hierarchical decision-mak-ing process of fruit choice and patterns of natural selection on fruit *** We recorded bird visits and measured fruit-related traits(fruit crop size,fruit diameter and seed weight)in a natural population of Psychotria carthagenensis,a bird-dispersed treelet,in a Yungas for-est from *** assess phenotypic selection patterns on fruit display traits,we performed multivariate selection analysis,and to explicitly identify a hierarchy of fruit trait choice we used a classifi-cation tree as a predictive *** Findings Selection patterns on fruit display traits were in agreement with a hierarchical process of fruit choice made by *** strength of directional selection on the total number of fruits in a plant(*** crop size)was nearly two times higher than on fruit size,and the classification tree analysis supported this hierarchical *** results support previous evidence that seed dispersers shape fruit crop size with higher intensity than subindividual fruit ***,high levels of subindividual phenotypic variation of fruit display traits may be explained by relaxed selection pressures exerted by *** studies also show that this pattern may consti-tute a general phenomenon among other pl

关键词： plant-animal interactions seed dispersal selection gradients subindividual variation

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On Rigid 2-Step Nilpotent Lie Algebras

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Algebra Colloquium 2018年第2期25卷 349-360页

作者： Maria Alejandra alvarez Departamento de Matematicas Facultad de Ciencias Basicas Universidad de Antofagasta Casilla 170 Antofagasta Chile

In this note we consider 2-step nilpotent Lie algebras and give a criterion for the rigidity of this class in the variety N2n of 2-step nilpotent Lie algebras of dimension n. We apply this criterion to prove that ever... 详细信息

关键词： nilpotent Lie algebras variety of Lie algebras deformations cohomology,nilradicals

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Review of the Cretaceous avian diversity of Antarctica:a changing scenario for the evolution of early Neornithine birds

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Advances in Polar Science 2024年第1期35卷 1-13页

作者： Carolina ACOSTA HOSPITALECHE facundo IRAZOQUI Paula BONA Ariana PAULINA-CARABAJAL División Paleontología de Vertebrados Museo de La PlataFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataPaseo del Bosque s/nLa Plata B1900FWAArgentina Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) Buenos Aires C1425FQBArgentina División Paleontología Vertebrados Museo de La Plata-Anexo ⅡFacultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataCalles 122 y 60La Plata B1900FWAArgentina Instituto de Investigaciones en Biodiversidad y Medioambiente(INIBIOMA) Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional del ComahueSan Carlos de Bariloche R8400GAMArgentina

The worldwide record of Cretaceous Neornithes and Neornithine-like birds is both controversial and poorly ***,in recent years,the Antarctic continent has yielded a substantial number of Maastrichtian avian specimens,contributing significantly to our understanding of the early evolution of this ***,the keen interest and collaborative efforts of various paleornithologists have resulted in a wealth of knowledge,which we have thoroughly reviewed,updated,and discussed in the context of recent discoveries.

关键词： Maastrichtian Antarctic Peninsula Vega Island Seymour(Marambio)Island Neornithes birds

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Effects of firewood harvesting intensity on biodiversity and ecosystem services in shrublands of northern Patagonia

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Forest Ecosystems 2020年第4期7卷 621-634页

作者： Matías G.Goldenberg facundo J.Oddi Juan H.Gowda Lucas A.Garibaldi Universidad Nacional de Río Negro Instituto de Investigaciones en Recursos NaturalesAgroecología y Desarrollo RuralSan Carlos de BarilocheRío NegroArgentina. Consejo Nacional de Investigaciones Científicas y Técnicas Instituto de Investigaciones en Recursos NaturalesAgroecología y Desarrollo RuralSan Carlos de BarilocheRío NegroArgentina. Laboratorio Ecotono INIBIOMACONICET-Universidad Nacional del ComahueSan Carlos de BarilocheRío NegroArgentina.

Background: Forest management has historically focused on provisioning of goods (e.g. timber, biomass), butthere is an increasing interest to manage forests also to maintain biodiversity and to provide other ecosystemservices (ES).Methods: We evaluated the effects of firewood harvesting intensity on biodiversity and different ES in threecontrasting shrubland sites in northern Patagonia (Argentina). At each site, four harvesting treatments, representingvarious levels of harvest intensity, were randomly assigned to eight permanent sample plots of 31.5m× 45 mduring 2013–***: We found that the effects of increasing harvesting intensity on plant diversity changed from negative topositive (and from nonlinear to more linear responses) with increasing site productivity. Harvesting intensityshowed contrasting effects on variables related to fire protection ecosystem service, since it reduced fuel amount(potentially reducing fire spread) but also reduced live fuel moisture content (potentially increasing flammability) atthe three sites. Two variables related to soil formation and protection ES, leaf litter cover and aerial soil cover,decreased with harvesting intensity at the three ***: We conclude that shrubland management for firewood production may enhance biodiversity withoutcompromising certain important ES. The intensity of harvesting should be determined according to site conditionsand forecasted impacts on biodiversity, fire and soil formation and protection.

关键词： Temperate forest ecosystems Disturbance intensity Plant diversity Ecosystem services

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