Alicia Barchuk's research while affiliated with National University of Cordoba, Argentina and other places

Publications (18)

Article
In semiarid regions, livestock is concentrated around water sources generating a piosphere pattern (gradients of woody vegetation degradation with increasing proximity to water). Close to the water source, livestock may affect the composition, structure and regeneration strategies of woody vegetation. We used the proximity from a water source as a...
Article
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Successful persistence of dry forests depends on tree regeneration, which depends on a balance of complex biotic interactions. In particular, the relative importance and interactive effects of shrubs and herbivores on tree regeneration are unclear. In a manipulative study, we investigated if thornless shrubs have a direct net effect, an indirect po...
Article
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In arid environments, direct facilitation (microhabitat amelioration) and indirect facilitation (“associational resistance” via protection from herbivory) among plants of different species may act simultaneously. Little is known about their relative effects. One way to disentangle the effects is by evaluating spatial associations. We examined the r...
Article
Protected areas play a significant role in carbon storage in arid and semi-arid land. In the central region of Argentina, there are three nature reserves located along a West to East rainfall gradient between two different phytogeographical provinces: the Monte and the Arid Chaco. The aims of this work were: (1) to quantify carbon storage in the th...
Article
Reliable estimates of biomass for the vegetation of the Arid Chacoforest is critical for its management, conservation or restoration. However, simple and non destructive techniques are not largely available. This study provides regression models aimed at estimating the aerial biomass of native shrub and tree species from the Arid Chaco, belonging t...
Article
Abstract The survival of Aspidosperma quebracho-blanco juveniles in the Arid Chaco is facilitated under the canopy of nurse plants. The possible effects of nurse plants were studied at intra- and interspecific levels by analysing the spatial distribution of juveniles and adults of A. quebracho-blanco, of the main shrubs Larrea divaricata and Mimozy...
Article
Resprouting strategy strongly contributes to survival of woody species, which can survive under stress and disturbance conditions, such as logging, herbivory and fire. The capacity of plants to resprout from adventitious buds at seedling stage, a highly vulnerable plant stage, may be determinant in the establishment success of species in arid envir...
Article
Abstract Aspidosperma quebracho-blanco is found throughout the Chaco (17°−33°S) in Argentina, and it is the dominant tree species in the arid Chaco. Under the hypothesis that morpho-physiological features of A. quebracho-blanco change as a function of its geographical position on a water deficit gradient, it was predicted that with increasing water...
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RESUMEN. La capacidad de rebrote es una caracterÌstica com ̇n en especies leÒosas que formanbanco de pl·ntulas que asegura la supervivencia ante la pÈrdida eventual de la biomasa aÈrea.Analizamos el efecto de la remociÛn total de la biomasa aÈrea sobre la supervivencia y elcrecimiento de las pl·ntulas de 14 especies leÒosas del Chaco ¡rido con el o...
Article
It has been postulated that seedlings of the main woody species from the Arid Chaco exhibit differences in survival and growth when renewal buds are totally removed, and that the responses depend on their leaf life span (deciduous or evergreen plants) and phylogeny (leguminous or non-leguminous families). Seeds of 14 shrub and tree species were pla...
Article
Abstract Three experiments were conducted to verify if an increase in environmental stress level would affect the interactions between two species of nurse shrubs and seedlings of Aspidosperma quebracho-blanco. This is a mesic species with a generalist distribution over an extensive environments gradient. The relationship between Larrea divaricata...
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This work adapts some generalized linear models in order to study the spatial pattern of an important tree species. The classical multivariate Ising model, which incorporates the dependence on neighbour individuals in a regular lattice, was adapted by setting a Poisson regression with an extra variation parameter to fit over-dispersion. Because the...
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The afforestation with native tree species was studied in small vegetated communities in the NW of the Province of Córdoba, Argentina. These are located in the Arid Chaco, and show clear signs of tree and soil degradation. The nursing effect of the most conspicuous shrub in the area (Larrea divaricata) was assessed in relation to the settlement of...
Article
The Aspidosperma quebracho-blanco is an important sclerophyllous evergreen species of the Argentine Chaco. There is scarce information about demographic patterns of A. quebracho blanco in the Arid Chaco. This paper focused on describing consequences of the process of degradation of the vegetation on the regeneration and size structure of A. quebrac...
Article
Full-text available
Given the state of resource degradation encountered in Chaco (Argentina), research on forest recovery methods and management proposals in accordance with the socioeconomic conditions of the region's inhabitants are imperative. The evaluation of factors that affect the plantation of arboreal species and the management knowledge necessary in the init...
Article
Full-text available
The structure of a weed-crop community composed by corn as a crop and several grasses and dicots as weeds was studied by 1) the removal of the dominant species, Sorghum halepense, 2) the removal of the group of short, accompanying grasses, Eleusine indica, Digitaria sanguinalis and Echinochloa colonum and 3) the introduction of corn (Zea mays). S....

Citations

... En estos bosques, los individuos de G. sarmientoi son de baja altura (Mereles 2005) y muy abundantes, pudiendo contabilizar hasta 286 individuos/ha (Loto et al. 2018). La vegetación acompañante está formada principalmente por especies de cactáceas columnares y especies arbustivas de la familia Capparaceae (Mereles 2005;Trigo et al. 2017), que forman una vegetación abierta, de estructura baja y con presencia de peladares, habitualmente cubiertos por Selaginella sellowii (Mereles 2005). Por el contrario, los individuos de G. sarmientoi que se encuentran en los bosques mixtos, acompañados por especies arbóreas de gran porte como Schinopsis spp., Aspidosperma quebracho-blanco y Tabebuia nodosa, pueden alcanzar una altura de 20 metros (Prado 1993). ...
... Sin embargo, en una segunda instancia, la participación de los grupos 5 y 6 pueden facilitar la densidad de individuos entre ellos, pero sin lograr un gran aporte de carbono acumulado. Ejemplo de estos son las interacciones de procesos de facilitación de recursos entre plantas (Barchuk et al. 2005, Tálamo et al. 2015, micro ambientes aprovechados por otras plantas (i.e., especies tolerantes a la sombra del dosel), o incluso competencia (Brassiolo and Pokorny 2000). ...
... pers.). Also, cattle can alter fruit production and change the spatial distribution and vertical structure of woody plants (Tálamo & Caziani, 2003;Tálamo et al., 2015). However, our results do not support this explanation because we did not find a relationship between foxes' activity index and fruit availability or understory structure (represented by shrubs density). ...
... These different responses were mostly driven by the increase in cover of woody species in the primary forest, especially of A. quebracho-blanco, the dominant species of this ecosystem type ( Figure S6). This species has shown higher recruitment in protected areas and under shrubs where abiotic conditions are ameliorated, and can resprout after being damaged (Barchuk & Del Pilar Díaz, 1999;Barchuk et al., 2006;de Noir et al., 2002;Tálamo et al., 2015). This gain in cover in the primary forest could have been associated with an increased in rainfall (see Supporting Information Appendix 1), but the fact that it was not equally observed in the ecosystem types under land use suggests that conditions at these sites may not be as suitable as in the primary forest or the response may have a time lag. ...
... In addition, previous studies reported the importance of adult tree density to ensure seed availability (Vayreda et al., 2013;Monteiro-Henriques and Fernandes, 2018). It was observed that some saplings are grown from the roots of adults such as has been found in other xerophytic trees with a vegetative reproduction (vegetative recovery from roots) (Moglia and Jofre, 1998;Barchuk et al., 2006). Previous studies showed that saplings are more abundant at grazed than ungrazed sites (Aschero and García, 2012) and that sapling establishment is related to cattle activity (Campos et al., 2011). ...
... La ecuación de regresión no lineal encontrada en ese trabajo coincidió con los hallado por Mora-Delgado y Holguín (2018) (19) evaluando arbustos en Colombia y la similitud de la predicción del peso acumulada de forraje de los cuatro arbustos que participaron en este trabajo fue análoga a la descripta por Dayenoff, et al (2000) (20) y por Iglesias y Barchuk (2010) (21) para especies arbustivas en la misma región en Argentina. ...
Reference: ALIMENTACIÓN
... First, the BM has relatively higher annual precipitation and temperature than the SM. To a certain extent, precipitation can determine the net primary productivity and ecosystem structure of arid ecosystems (del Rosario Iglesias et al., 2012), which may in turn affect the accumulation and decomposition of soil carbon and nitrogen through biotic processes related to organic matter and vegetation productivity (Campo and Merino, 2016;Carvalhais et al., 2014). Furthermore, the temperature is one of the important factors affecting the growing season and coverage of vegetation. ...
... In order to establish and survive, P. ferox and C. andicola seedlings need to be exposed to more sunlight, as long as there is high water availability. Seedlings of Prosopis chilensis also showed increased survival in open spaces compared with beneath nurse species [77]. In an observational study conducted by López et al. (2007), P. ferox seedlings seemed indifferent to shade, which could imply that different approaches (experimental/observational) may produce different results [78]. ...
... These different responses were mostly driven by the increase in cover of woody species in the primary forest, especially of A. quebracho-blanco, the dominant species of this ecosystem type ( Figure S6). This species has shown higher recruitment in protected areas and under shrubs where abiotic conditions are ameliorated, and can resprout after being damaged (Barchuk & Del Pilar Díaz, 1999;Barchuk et al., 2006;de Noir et al., 2002;Tálamo et al., 2015). This gain in cover in the primary forest could have been associated with an increased in rainfall (see Supporting Information Appendix 1), but the fact that it was not equally observed in the ecosystem types under land use suggests that conditions at these sites may not be as suitable as in the primary forest or the response may have a time lag. ...
... In the arid Chaco, it is the only dominant species. Here it has been verified that for its installation it requires the facilitation of "nurse" plants, generally shrubs of the genus Larrea (Barchuk et al. 2000). which is undoubtedly a significant contribution to the study of its genetic resources. ...