Perceived barriers for accessing international research funding among Latin American researchers Estos datos forman parte de un estudio que busca reconocer qué tipo de barreras encuentran los y las investigadores/as latinoamericanos/as al presentarse en convocatorias de financiamiento internacionales. Así como qué estrategias y necesidades de capacitación reportan, con el objetivo de generar evidencia que oriente iniciativas de fortalecimiento de capacidades y políticas de financiamiento más inclusivas. Las opciones incluidas en esta encuesta fueron diseñadas en base a los datos aportados por un focus group realizado previamente.

Base de datos usada para el estudio Can Programming Improve Executive Functions in Preschoolers? A Pilot Study on Low- and Middle-Socioeconomic Status Schools Datos que contienen scores totales pre y post de un estudio en el que la intervención fueron clases de programación y el control fueron clases de arte, ambas con tablets, en niños de 5 años de edad de escuelas de nivel socioeconómico medio y bajo

Producciones en el aula de los estudiantes de quinto y sexto año de la Escuela Secundaria 66 de Mar del Plata y del Colegio Alfred Nobel, primer semestre de 2024 Producciones de loes estudiantes en el primer semestre de 2024. Trabajos de los estudiantes de quinto y sexto año de la Escuela 66 y de quinto y sexto año de la Escuela Nobel.

Photodegradation and microbial decomposition of soybean and maize crop residues before and after harvest Cabrera, Felipe; Araujo, Patricia Inés; Vivanco, Lucía The role of sunlight and its interaction with microorganisms in crop residue decomposition is largely unknown in agroecosystems. We evaluated soybean and maize residue decomposition before harvest, when plants were senescent and standing, and after harvest, during winter fallow, when residues remained on the soil surface. We hypothesized that (1) sunlight dominates decomposition before harvest, whereas microbes become more relevant after harvest, and (2) soybean residues decompose faster than maize due to higher susceptibility to sunlight-driven decay before harvest and greater nutrient content, enhancing microbial decomposition after harvest. We conducted a field experiment in the Argentine Pampas, manipulating sunlight and microbes with filters and a biocide, respectively. Contrary to our expectation, decomposition before harvest was significantly accelerated by both sunlight and microbes additively, resulting in carbon losses of approximately 141 kg C ha⁻¹ in maize and 108 kg C ha⁻¹ in soybean leaf residues. Sunlight alone accounted for 15–24 % of total leaf mass loss, while microbes contributed 30–54 %. The results indicated that sunlight acted through photodegradation rather than photofacilitation of microbial decomposition. Before harvest, decomposition was twice as fast as after harvest, with no effect of sunlight or microbes. Soybean residues decomposed faster than maize due to greater susceptibility to sunlight (canopy structure and lignin) and enhanced microbial activity before harvest, and lower mechanical resistance after harvest. These findings highlight that both sunlight and microbes substantially contribute to residue turnover, particularly of standing dead crops before harvest, a critical yet often overlooked stage in cropland carbon dynamics.

Natural fractures distribution in mixed facies: A geomechanical model for heterogeneous reservoirs (Quintuco Formation, Neuquén basin) Tettamanti, Magdalena; García, Micaela Romina; Olivo, Mariana Soledad; Franzese, Juan Rafael; Buchanan, G.V.; Muñoz Olivero, Tobías Manuel; Chiacharelli, F. The distribution of natural fractures in mixed carbonate-siliciclastic reservoirs has a critical influence on fluid flow and reservoir performance. Internal sedimentary and structural heterogeneities represented by facies characteristics, bedding thickness, and fracture networks significantly affect petrophysical parameters. In low permeability reservoirs, fractures enhance fluid flow. Their distribution depends on stress orientation, magnitude, and rock competence, varying with the properties of the sedimentary layer.This study analyse the spatial variability of natural fracture networks within the reservoir heterogeneities using geomechanical facies. It identifies non-competent facies with low fracture intensity and competent facies with high fracture intensity, in order to improve predictions of reservoir behaivour. The research focuses on the Lower and Middle Members of the Quintuco Formation (Loma La Lata Block, Neuqu´en Basin), a heterogeneous reservoir characterised by stratigraphic and structural trapping mechanisms and a developed fracture system, and its surface equivalent, the Picún Leufú Formation (Tithonian-Berriasian).Data collection involved scratch tests and facies analysis supported by detailed sedimentological sections from three core-wells, which were correlated with Gamma Ray logging and X-ray diffraction analyses. Three geomechanical facies were identified: High Resistance-Competent, Low Resistance-Competent, and Non-Competent facies. This work reveals that systematic fractures developed at mechanical contrast interfaces exhibited increased fracture intensity and connectivity, with porosity reaching up to 10%, thereby enhancing the fluid transport. Integrating multi-scale analyses enhances the geomechanical modelling and identifies areas with greater permeability. This work contributes to refining predictive models for exploration and defining development strategies for heterogeneous reservoirs, aiming to optimise the drilling production by targeting highconnectivity zones.

Resultados de GWAS en enfermedad de Alzheimer AGA-ALZAR-PRONADIAL es un proyecto multicéntrico con sitios de recolección de datos ubicados en toda Argentina. Fue desarrollado para identificar genes de susceptibilidad a la enfermedad de Alzheimer esporádica (EA) y genes que modifican fenotipos relacionados con la EA. Se incluyen los resultados de GWAS de un total de 1018 personas de 60 años o más, 602 personas cognitivamente normales y 416 con EA.

Fichas registro Colección arqueológica Museo histórico de La Viña (Salta) Las actividades que se realizaron en el marco del convenio han sido el acondicionamiento de los objetos arqueológicos, registro de información cuantitativa y cualitativa, Registro fotográfico, Guía de procedimientos y Charla destinada a la comunidad. Participaron todos los integrantes del Grupo de trabajo: Dra. Rossana Ledesma, CPA Carlos Flores, becarios CONICET Lic. Rodrigo Cardozo, Lic. Florencia Ganám Campos, Lic. Valentina Torres López, Paola Avendaño y Lic. Jimena Villarroel. En referencia al presupuesto, la contraparte Municipalidad de La Viña cumplió con lo establecido en el convenio. Se realizó el registro de la colección de bienes arqueológicos ubicados en el Museo de la Viña y ahora cuentan con documentación profesional y conservación. Las fichas RENYCOA son exigidas por la Ley 25.743, de Protección del patrimonio arqueológico y paleontológico, se constituyen la base para la correcta gestión de un museo de arqueología y son fundamentales ante robos de los bienes y activar la búsqueda a nacional por las fuerzas de seguridad. Se planificó el registro de 50 objetos y se realizó esta tarea con 44, esto se debe a que seis objetos no eran piezas arqueológicas. La reproducción de piezas arqueológicas en formato 3D serán publicadas semanalmente en las cuentas de Instagram de Tecnoriginaria ICSOH CONICET UNSa (https://www.instagram.com/tecnoriginaria) y de Cultura y turismo de La Viña (https://www.instagram.com/visitlavina.slaarg/). El registro también fue subido al repositorio institucional Conicet Digital.

Cenozoic exhumation of the Frontal Cordillera revisited: Insights from low-temperature thermochronology studies and other geological constraints Lossada, Ana Clara; Giambiagi, Laura Beatriz; Mackaman Lofland, Chelsea; Suriano, Julieta; Bertoa del Llano, Macarena The Frontal Cordillera is a prominent north–south-trending morphostructural feature in the southern Central Andes, characterized by high topography and relief,monotonic lithologic exposures of Late Paleozoic to Triassic volcanic and intrusive rocks, and thick-skinned deformation. It spans from ~27 to 28◦S, where itgradually transitions into the Puna Plateau, to 34.8◦S, where it terminates abruptly. Most of the along-strike exposure of this tectonic domain coincides spatially withthe modern Argentina-Chile (Pampean) flat-slab subduction segment (27–33◦30′S). Early studies attributed the construction of the Frontal Cordillera to enhancedtransmission of compressional stresses to the overriding plate during the Middle Miocene–Recent southward migration of flat-slab subduction, and the associatedpropagation of deformation to the foreland. However, recent studies have questioned north-to-south diachronism in the structural evolution of the Frontal Cordillera,as well as the extent to which uplift and exhumation were controlled by flat-slab subduction. The timing of deformation in the Frontal Cordillera has been primarilyconstrained through the analysis of synorogenic sedimentary records and crosscutting structural relationships. Thermochronological studies have emerged asadditional, powerful tools for quantifying the exhumation of ranges that comprise the Frontal Cordillera. Despite the proliferation of structural, sedimentological,geo/thermochronological, and geomorphic studies in recent years, fundamental aspects –including the timing and patterns of rock uplift and exhumation in theFrontal Cordillera, and the overall vergence of the Andean orogenic wedge at these latitudes– remain topics of debate. This contribution presents an updated reviewof thermochronological studies carried out in the Frontal Cordillera in recent years, and the implications of these data for regional tectono-thermal evolution in thecontext of other, independent geologic constraints. Our data compilation reveals that the main phase of rock uplift and exhumation preceded the onset of flat-slabsubduction and occurred largely synchronously along strike during the Early to Middle Miocene. This phase of deformation overlapped with the final stages ofcontraction in the Principal Cordillera to the west, suggesting an east-directed propagation of deformation. The results also point to a period of pronounced crustalshortening during the Early Miocene, marked by the simultaneous activity of multiple tectonic domains within the Andean wedge.

Efectos del uso forestal y ganadero en el suelo de bosques de Austrocedrus chilensis del sudoeste de Río Negro, Argentina; Effects of forest and livestock use on the soil of Austrocedrus chilensis forests in southwestern Río Negro, Argentina Cortés Pérez, Olayer Pedro Esteban; Bistolfi, Nicolás Martín; Riat, Martha Cecilia; Blazina, Ana Paula; Villacide, Ezequiel Martin; Amoroso, Mariano Martin Las investigaciones relacionadas con los impactos de las actividades forestal y ganadera sobre suelos de los bosques andino-patagónicos son escasas, a pesar del rol crítico de los suelos en múltiples funciones y servicios ecosistémicos. El objetivo de este trabajo fue estudiar el efecto del uso forestal y ganadero sobre aspectos físicos y biológicos del suelo superficial (0-10 cm) y la relación con sus funciones en bosques de Austrocedrus chilensis del sudoeste de Río Negro. Para ello se muestrearon 57 rodales con diferentes intensidades de uso ganadero y forestal, determinadas según el número de heces y tocones por transecta. Se evaluó la densidad aparente, la estabilidad estructural del suelo, la densidad de raíces, la materia orgánica del suelo, la materia orgánica particulada y la materia orgánica asociada a la fracción mineral. Para analizar la relación entre intensidades de uso y las variables, se utilizaron modelos lineales generalizados mixtos. La densidad aparente, la densidad de raíces y la materia orgánica asociada a la fracción mineral se relacionaron significativamente con cambios en la intensidad de uso ganadero. Las relaciones observadas implicaron que la mayoría de las influencias de las intensidades de uso sobre las funciones del suelo fueran negativas. Implicancias. Este trabajo destaca la necesidad de continuar investigando las posibles implicancias de la actividad silvopastoril en estos suelos. Los hallazgos subrayan la importancia de promover estrategias de manejo que compatibilicen la producción con la gestión sustentable de los bienes comunes naturales, con especial énfasis en la conservación de los suelos y sus funciones en los bosques andino-patagónicos.; 1. Research related to the impacts of forestry and livestock activities on the soils of Andean-Patagonian forests is scarce, despite the critical role of soils in multiple ecosystem functions and services.2. The aim of this work was to study the effect of forest and livestock use on physical and biological aspects of the topsoil (0-10 cm) and its relationship with soil functions in Austrocedrus chilensis forests in southwestern Río Negro.3. For this purpose, 57 stands with different intensities of livestock and forest use were sampled. Intensity of use was determined by the number of stools and stumps per transect. Bulk density, soil structural stability, soil organic ma�er, particulate organic ma�er, organic ma�er associated with the mineral fraction, and root density were measured at each site. Generalized linear mixed models were used to analyze the relationship between use intensity and the variables considered.4. Bulk density, root density, and organic ma�er associated with the mineral fraction were significantly related to changes in livestock use intensity.5. The observed relationships imply that most of the influences of use intensity on soil functions were negative.6. Implications. This work highlights the need to continue researching the possible implications of silvopastoral activity on these soils. The findings underscore the importance of promoting management strategies that make production compatible with the sustainable management of natural commons, with special emphasis on soil conservation and its associated functions in Andean-Patagonian forests.

Can cumulative disadvantages be reversed? Class attainment and a network analysis of intergenerational occupational pathways by migratory origin in Buenos Aires, Argentina Dalle, Pablo Martin; Carrascosa, Joaquin This article analyzes patterns of intergenerational social mobility by family migratory origin in the Buenos Aires Metropolitan Area. The Argentine case contributes to current debates on assimilation and social mobility by comparing long-term class attainment among descendants of European immigrants and those of internal (“mestizo”) or Latin American origin. Drawing on pooled data from two recent probabilistic surveys (2021 and 2023), we apply multinomial logistic regression models to estimate the relative chances of social class attainment across different groups. In addition, social network analysis (SNA) is employed to conduct a micro-level examination of intergenerational occupational trajectories among migrants, natives, and their descendants, who share similar working-class backgrounds but differ in ethnic origin. This approach highlights occupations that serve as springboards for upward mobility and magnets for class reproduction. Results show that migrants, both internal and regional, have had fewer opportunities for upward mobility. Second-generation individuals born in the Buenos Aires Metropolitan Area (MABA) of mestizo descent and children of Latin American migrants display similar chances of upward mobility to those of European descent when controlling for class origins and education. However, the children of internal migrants of mestizo descent exhibit limited upward mobility, even after controlling for class origins and educational attainment. This pattern is also observed among the first generation of internal migrants and among Latin American migrants. Disparities in class attainment reflect the cumulative disadvantages experienced by subaltern ethnic groups, rooted in long-standing structural inequalities. However, the micro-level analysis shows that, among disadvantaged migrant groups, the offspring of Latin American immigrants tend to experience slightly greater short-range upward mobility, particularly through gendered patterns, such as manual crafts among men and tertiary qualifications among women, especially in health and education.

Impact of Trail Proximity and Substrate on the Taxonomic and Functional Diversity of Bryophyte in a Valdivian Temperate Rainforest Cottet, Agustina Celeste; Floriani, Franco Daniel; Fernández, Natalia Verónica Aims: Recreational trails in temperate rainforests can generate subtle but ecologically significant impacts. Bryophytes, due to their poikilohydric nature and substrate dependence, are excellent indicators of environmental change. We aimed to evaluate the effects of trail proximity and substrate availability on the taxonomic diversity and functional trait composition of bryophyte communities.Location: Lago Puelo National Park, Patagonia, Argentina, within Valdivian temperate rainforest.Methods: We established 66 plots (1m2) at two distances from a recreational trail (near and far). In each plot, we recorded canopy openness, vegetation cover, sampled substrate type, bryophyte species richness, and functional traits related to water regulation.Results: A total of 46 taxa were identified (33 mosses and 13 liverworts). Moss richness was significantly higher near the trail and on ground substrates. Substrate type significantly influenced the distribution of functional traits, while the interaction be-tween trail proximity and substrate type shaped taxonomic beta diversity.Conclusions: Bryophyte communities proved sensitive to subtle environmental gradients created by recreational trails. Our results highlight their potential as indicators for biodiversity monitoring. We recommend prioritizing bryophyte-rich substrates in management strategies and integrating functional diversity metrics into conservation assessments of Valdivian temperate forest trails.

Field Cage Assessment of the Neotropical-Native Parasitoid Ganaspis pelleranoi as a Biocontrol Agent of the Invasive Pest Ceratitis capitata Suárez, Lorena; Núñez Campero, Segundo Ricardo; Buonocore Biancheri, María Josefina; Schliserman, Pablo; Mello Garcia, Flávio Roberto; Ovruski Alderete, Sergio Marcelo AbstractCeratitis capitata (Diptera: Tephritidae), or medfly, is an invasive pest widespread in Argentina, where standardized management methods, such as cultural and chemical controls,are commonly implemented. The success in controlling medfly populations depends onimplementing preventive, sustainable, long-term, and eco-friendly eradication/controlstrategies across all invaded environments. One strategy may involve augmentative biological control using parasitoids adapted to local conditions, such as Ganaspis pelleranoi(Brèthes) (Hymenoptera: Figitidae), a Neotropical-native parasitoid that mostly forageson tephritid larvae in a broad range of fallen fruit. Two hypotheses were tested in thecurrent study: (1) G. pelleranoi females are more efficient in controlling medfly larvaeinfesting different fruits as the density of released females progressively increases, and(2) such parasitoid-induced host mortality capacity remains when host density is increased.Parasitism (reproductive effects) and additional host mortality (non-reproductive effects)were the indicator variables of parasitoid-induced host ability. Trials were performed infield cages (semi-field conditions) using two medfly-multiplier host fruit species, namelysour orange and peach, and with variations in both parasitoid release and host larvaldensities. Three major findings were highlighted: (1) G. pelleranoi females successfullyparasitized host larvae on peach and sour orange, regardless of their strongly differingphysical features, although medfly larvae in peaches were significantly more susceptible tothe parasitoid; (2) medfly mortality significantly increased in both peach and sour orangerelative to the gradual increase in released G. pelleranoi females, regardless of the increasein host density offered to parasitoids; and (3) G. pelleranoi females induced a substantiallyhigh host die-off rate when the additional mortality was added to the analysis, which wasnot revealed when parasitism alone was regarded as a medfly mortality variable. Suchoutcomes may provide relevant information for implementing an augmentative biological control against medfly using indigenous parasitoid species within an eco-friendly fruit flypest management approach.

Genotoxic and Biochemical Responses of the Amphibian Rhinella arenarum Under Exposure to the Herbicide 2,4‐Dichlorophenoxyacetic Acid (2,4‐D) Laborde, Milagros Rosa Raquel; Ruiz de Arcaute, Celeste; Soloneski, Sonia Maria Elsa The widespread use of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), an analogue to the hormone auxin, raises concerns regarding its potential impact on aquatic organisms, particularly amphibians. Thus, this study aimed to evaluate the genotoxic and oxidative effects of an environmentally relevant concentration of 2,4-D on Rhinella arenarum tadpoles. To this end, tadpoles were acutely exposed to 5 μg/L of 2,4-D under laboratory conditions using the microformulation Dedalo Elite (30% a.i.). Genotoxicity was assessed via the alkaline comet assay, measuring DNA single-and double-strand breaks. Oxidative balance was evaluated by determining catalase (CAT) and glutathione S-transferase (GST) activities, along with reduced glutathione (GSH) levels. The results demonstrated that, after exposure, tadpoles showed significant increases in DNA damage, with 3.32-and 2.92-fold increases at 48 and 96 h, respectively. The 48-h exposure increased DNA damage, but extended exposure (96 h) had a lesser effect. In addition, after 96 h of exposure, CAT activity was significantly reduced (43.8%), and GSH levels decreased by 29.8%, indicating the induction of oxidative stress. These findings highlight the sensitivity of R. arenarum tadpoles to sublethal 2,4-D concentrations and emphasise the ecological relevance of assessing early life stage responses in amphibians. Our results add to the growing evidence on the risks posed by widely used auxinic herbicides, with detrimental effects on cellular integrity that may compromise the early life stages of freshwater species in their natural environments.

Topology optimisation-based design of duct cross-sections for fully developed magnetohydrodynamic flows Álvarez Hostos, Juan Carlos; Urgorri, Fernando R.; Principe, Javier In this communication, duct cross-sections for fully developed inductionless magnetohydrodynamics (MHD) flows are designed via topology optimisation (TO). The objective function to be maximised is the volumetric flow rate that can be achieved along the duct under a prescribed pressure gradient, subject to an area constraint imposed on the cross-sectional geometry. The solid-liquid transition within the topology is modelled through a Darcy term, where the permeability is defined using the Carman-Kozeny equation as a function of an apparent liquid fraction, effectively enforcing zero velocity in solid regions. The well-known solid isotropic material with penalisation (SIMP) technique is used to define the apparent liquid fraction and to interpolate between the electrical conductivities of solid and fluid phases. A finite element framework is used for the multiphysics analysis, with a single design variable (artificial density) assigned to each finite element. Details of the adjoint-based sensitivity analysis within this multiphysics context are provided, and the influence of both the orientation and dominance of the magnetic field on the resulting topologies is also examined. The results demonstrate that the proposed optimisation strategy effectively yields solutions that maximise the flow rate, and that such topologies differ significantly from those expected in standard fluid dynamics problems, with strong dependence on magnetic field characteristics. Furthermore, the combined use of SIMP interpolation and the Carman-Kozeny-based Darcy term ensures stable convergence of the optimisation process within the inductionless MHD framework, even when accounting for the interpolation of electrical conductivity.

Insoluble soybean polysaccharides as emulsifiers: Impact of sonication and acidic pH on interfacial behaviour and emulsifying properties Moscoso Ospina, Yeisson Andres; Correa, María Jimena; Porfiri, María Cecilia; Cabezas, Dario Marcelino BACKGROUND: This study sought to obtain and assess different insoluble soybean polysaccharide (ISPS) fractions from defatted soybean flour for their use as oil-in-water emulsifiers. The primary focus was to examine the influence of specific processing conditions – particularly the timing of sonication – on the physicochemical properties of these fractions and their subsequent ability to stabilise emulsions, elucidating the underlying mechanisms through protein–polysaccharide interactions. RESULTS: The S-ISPS fraction, obtained by sonication prior to alkaline extraction, showed a significantly higher extraction yield (354 g kg−1 ) and enhanced protein solubility compared to ISPS and ISPS-S fractions. Structural changes induced by sonication, such as acid hydrolysis and deamidation, critically improved interfacial activity, significantly reducing interfacial tension even at low concentrations. Consequently, S-ISPS consistently produced emulsions with the smallest average droplet diameters. Conversely, ISPS and ISPS-S formed larger droplets and displayed a higher bulk complex viscosity, indicating the presence of a more robust and compact floc network. All ISPS fractions demonstrated excellent stability against droplet coalescence over 28 days at acidic pH. CONCLUSION: This research highlights that while all fractions are high-potential emulsifiers, the specific processing, particularly the timing of sonication, significantly alters the physicochemical properties of the ISPS fractions and their performance as emulsifying agents. The findings underscore the increased added value of this soybean by-product via synergistic protein–polysaccharide interactions.

Persistent neuropathic pain selectively impairs hedonic and motivational aspects of eating: Insights from a mouse model Valdivia Torres, Lesly Spring; Agostino, Patricia; Reynaldo, Mirta Beatriz; Singh, Sudhuman; Carrasquillo, Yarimar; Perello, Mario; Kasanetz, Fernando Chronic pain is known to disrupt affective and motivational states, yet its impact on eating behavior—particu­larly the balance between homeostatic and reward-driven intake—remains poorly understood. Using the spa ed nerve injury (SNI) model in male and female mice, we investigated how persistent neuropathic pain alters food intake and reward processing. Fourteen days post-surgery, mice underwent a binge-eating protocol with high-fat diet (HFD), along with operant conditioning for chocolate pellets, and a sucrose preference test to assess hedonic and motivational behavior. Chow intake and body weight were tracked to monitor homeostatic feeding. SNI induced mechanical hypersensitivity without affecting daily chow intake or weight, indicating preserved ho­meostatic feeding. In contrast, male SNI mice showed an attenuated and irregular escalation of HFD consump­tion, reduced operant responding and sucrose preference—consistent with diminished motivation and anhedonia. Female SNI mice exhibited similar motivational impairments but did not show a clear binge-like eating phenotype. To explore underlying mechanisms, we assessed neuronal activation in nucleus accumbens (Acb) subregions—a key site where pain and reward pathways converge—using c-Fos immunostaining following HFD exposure. While HFD increased c-Fos expression in both control and SNI groups, no significant differenceswere detected between them, suggesting that pain-induced changes in hedonic feeding may involve noncanonical neural circuits or mechanisms not captured by immediate early gene activation. Together, these re­sults indicate that persistent neuropathic pain selectively disrupts hedonic and motivational aspects of eating behavior, while sparing homeostatic regulation, and may signal the emergence of broader affective disturbances associated with chronic pain.Perspective: This article presents data from mouse models combining neuropathic pain and binge-eating para­ digms, revealing that persistent pain selectively disrupts specific components of eating behavior—insights that may help inform strategies to prevent comorbid eating disorders in chronic pain patients.

Ecotypic differentiation in populations of the giant kelp Macrocystis pyrifera from southern Chile: Implications for the species aquaculture development Fernández, Pamela Rocío; Poza, Ailen Melisa; Wallet, Thibault; Hernández, Ximena; Camus, Carolina The giant kelp Macrocystis pyrifera is a foundation species with high ecological and economic importance, increasingly considered for aquaculture in southern Chile. However, populations experience strong environ- mental heterogeneity, particularly in fjord systems where salinity and temperature fluctuate due to freshwater inputs. Such conditions may drive ecotypic differentiation, influencing stress tolerance and cultivation potential. In the present study, physiological and biochemical responses of juvenile sporophytes from inner-sea (estuarine) and oceanic populations exposed to contrasting absolute salinity (SA 32 vs. SA 22) and temperature regimes (8, 11, and 16 ◦C) were compared. There were pronounced population-specific differences under hyposalinity. Inner-sea sporophytes maintained higher growth, photosynthetic rates, antioxidant capacity, and pigment sta- bility, indicating local adaptation to estuarine environments. By contrast, oceanic sporophytes exhibited reduced growth and photosynthetic performance, greater frond bleaching, and higher nitrogen accumulation under low salinity, suggesting osmotic stress and limited metabolic adjustment. Polyphenol levels were consistently higher in oceanic sporophytes but were not associated with enhanced antioxidant activity, highlighting differential biochemical strategies among populations. These findings provide evidence of ecotypic differentiation in M. pyrifera and underscore the importance of considering local adaptation in aquaculture development. Selecting tolerant genotypes, particularly from estuarine habitats, may improve resilience and productivity of kelp culti- vation under projected climate-driven increases in freshwater inputs

Primeras evidencias de poblamiento temprano en la provincia de La Rioja (Argentina); First evidence of early peopling in the province of La Rioja (Argentina) Heider, Guillermo; Rivero, Diego Eduardo; Balena, Imanol; Domingues Mortágua, Roberto Rúben; Brizuela, Florencia Aldana; Pastor, Sebastián En esta nota presentamos las dos primeras puntas de proyectil Cola de Pescado identificadas en la provincia de La Rioja. Ambas provienen de la colección del Museo Arqueológico Runa Huasi de la localidad de Malanzán (Dpto. Gral. Juan Facundo Quiroga). La primera de ellas, hallada a nivel superficial en el sitio Guanso, fue elaborada sobre cuarzo cristalino, carece de la base del pedúnculo, así como del sector distal del ápice. La segunda es una preforma de basalto, fracturada en la parte baja del limbo y también recuperada en superficie en el sitio Los Colorados. Su presencia confirma tendencias sobre la distribución de las puntas paleoindias en el centro deArgentina, en cuanto a que proceden del nivel superficial y con un solo sitio con más de una pieza. Tomando en cuenta este panorama, se describen las características tecno-morfológicas, métricas y las materias primas utilizadas en la elaboración de ambas puntas. Luego, a manera de cierre, se reflexiona en dos sentidos. Por un lado, reforzamos nuestra valoración sobre las colecciones de museos para el análisis, resguardo, puesta en valor y comunicación pública del patrimonio arqueológico. Por otro, discutimos ideas generales sobre los modelos vigentes para el poblamientotemprano del centro de Argentina a partir de las dos nuevas piezas. Según se propone, este conjunto de datos refuerza la idea de ingresos de pequeños grupos en una fase exploratoria del territorio durante la transición Pleistoceno-Holoceno.; We present the first two Fishtail points identified in the province of La Rioja. Both come from the Runa Huasi collection, housed in the locality of Malanzán (Gral. Juan Facundo Quiroga Department). One specimen made of crystalline quartz was found on the surface at the Guanso site; it lacks both the stem base and the distal portion of the blade. The other is a basalt preform, fractured in the lower part of the blade, which was also recovered from the surface at Los Colorados site. Its identification supports the distribution pattern of Paleoindian points in central Argentina, which are generally recorded as isolated surface finds, with only one site yielding more than a single specimen. Here, we describe their techno-morphological and metric characteristics, as well as the raw materials used in their manufacture. Finally, we reflect on two broader issues. First, we emphasize the importance of collections for the analysis, preservation, enhancement, and communication of archaeological heritage. Second, we reconsider current models for central Argentina in light of these new findings. We argue that they reinforce the hypothesis of small groups entering the region during an exploratory phase of the Pleistocene–Holocene transition.

Hopf 2-cocycles of type A_2 Sánchez, José Ignacio We compute the Hopf 2-cocycles involved in the classification of pointed Hopf algebras of diagonal type A2. When the quantum Serre relations are deformed, we characterize those cocycles that can be recovered from Hochschild cohomology, via exponentiation. We identify some hypotheses that allow us to present general formulas that apply in our setting.

Flora vascular de la provincia de Santa Fe, Argentina: Chenopodiaceae Brignone, Nicolás Fernando Introducción y objetivos: La flora vascular de la provincia de Santa Fe ha sido poco estudiada y, dentro de ella, la familia Chenopodiaceae no ha sido estudiada sistemáticamente. El objetivo de este trabajo es presentar un tratamiento taxonómico de las Chenopodiaceae de la provincia de Santa Fe. M&M: Se siguieron los métodos clásicos en taxonomía, incluyendo el análisis de ejemplares de herbario y plantas observadas directamente en el campo. Se llevaron a cabo análisis de la distribución espacial en base a registros de ocurrencia, principalmente obtenidos de las etiquetas de los ejemplares de herbario. Resultados: En la provincia de Santa Fe crecen 12 géneros de Chenopodiaceae con 25 taxones infragenéricos (22 especies y tres subespecies). La mayor distribución corresponde a Dysphania ambrosioides y Oxybasis macrosperma. El departamento General López alberga la mayor riqueza específica, al igual que la región Pampeana en términos fitogeográficos. Conclusiones: Este estudio presenta una actualización detallada de las especies de Chenopodiaceae de la flora vascular de Santa Fe, aportando valiosos conocimientos sobre su taxonomía y distribución.; Background and aims: The vascular flora of Santa Fe Province has been poorly studied, and within it, Chenopodiaceae has not been systematically investigated. The aim of this study is to provide a taxonomic treatment of the Chenopodiaceae in Santa Fe. M&M: Classical taxonomic methods were followed, including the examination of herbarium specimens and plants directly observed in the field. Spatial distribution analyses were conducted based on occurrence records, primarily obtained from herbarium specimen labels. Results: In Santa Fe, 12 genera of Chenopodiaceae are present, comprising 25 infrageneric taxa (22 species and three subspecies). The widest distributions correspond to Dysphania ambrosioides and Oxybasis macrosperma. General López Department harbors the highest species richness, as does the Pampean region in phytogeographic terms. Conclusions: This study provides an updated and detailed account of the Chenopodiaceae for the vascular flora of Santa Fe, contributing valuable insights into their taxonomy and distribution.