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Análisis de la evolución del clima y los pastizales naturales en el noroeste de la provincia de Chubut, Argentina, durante el período 2000-2014: identificación de variables asociadas a la disminución de las existencias ganaderas en la región
Garcia Martinez, Guillermo Carlos; Ciari, Georgina; Gaitan, Juan Jose; Caruso, Cecilia Alejandra; Nagahama, Nicolas; Opazo, Walter Javier; Nakamatsu, Viviana Beatriz; Lloyd, Carlos Eduardo; Antiman Cotut, Camila Rosa; Irisarri, Jorge Gonzalo Nicolás; Escobar, Juan Maria (2017-06)Una elevada proporción del territorio argentino corresponde a tierras secas y una tercera parte de éstas se hallan en la Patagonia. Esta región históricamente ha sufrido procesos de deterioro del pastizal. Generalmente, ... -
Effects of dietary supplementation on vegetation cover and its defoliation by sheep in extensive husbandry
Garcia Martinez, Guillermo Carlos; Caruso, Cecilia Alejandra; Villa, Martin Diego; Ceballos, Demian; Opazo, Walter Javier; Beloqui, Alfonso; Curcio, Matías Hernán (Elsevier, 2022-06-06)Dietary supplementation is one of the most used strategies to reduce the effect of environmental fluctuations in arid and semi-arid environments. We evaluated changes in vegetation and in patterns of animal defoliation as ... -
Germination requirements of two sheep-preferred grasses (Hordeum comosum and Koeleria vurilochensis var. patagonica) from semiarid Patagonian steppes
Gundel, Pedro Emilio; Irisarri, Jorge Gonzalo Nicolás; Sorzoli, N.S.; Mosso, C.E.; Garcia Martinez, Guillermo Carlos; Golluscio, Rodolfo Angel (Elsevier, 2012-03)Grazing by domestic exotic herbivores on native vegetation in Patagonian steppes has led to the deterioration of forage resources, where grasses are replaced by shrubs, and preferred grasses by non-preferred ones. Therefore, ... -
Grass recruitment constraints along a grazing gradient in Patagonia: N-limitation x adult competition trade-off
Garcia Martinez, Guillermo Carlos; Golluscio, Rodolfo Angel (Elsevier, 2021-03-09)We explored the effect of N addition and adult canopy competition on the recruitment of lost preferred species in the Patagonian steppe, where a decelerated N cycling scenario (sensu Ritchie et al., 1998) had been previously ... -
How does grazing affect soil water availability in the Patagonian steppe?
Golluscio, Rodolfo Ángel; Garcia Martinez, Guillermo Carlos; Cavagnaro, Fernando Pablo (Elsevier, 2022-06-01)In the Patagonian steppe, grazing may or may not reduce soil water availability: it may increase evaporative losses, because it reduces plant cover, but may decrease transpiration losses because it decreases plant biomass. ... -
Suplementación en estepas patagónicas: ¿oportunidad o riesgo ambiental?
Golluscio, Rodolfo Ángel; Garcia Martinez, Guillermo Carlos; Ormaechea, Sebastián Gabriel; Valenta, Magalí Débora (Facultad de Agronomía, Universidad de Buenos Aires, 2023-03-29)El deterioro de los recursos forrajeros de la Patagonia se evidencia en la reducción de la cobertura vegetal, la producción primaria neta aérea (PPNA) y las existencias ovinas, esto último asociado con la caída de la ... -
Trends of aboveground net primary productivity of Patagonian meadows, the omitted ecosystem in desertification studies
Curcio, Matías Hernán; Irisarri, Jorge Gonzalo Nicolás; Garcia Martinez, Guillermo Carlos; Oesterheld, Martin (MDPI, 2023-05-08)The United Nations defines desertification as the loss of productivity in arid and semiarid environments. The extended steppes of Patagonia harbor small meadows whose compounded area is comparatively small, but their ... -
Variabilidad germinativa en semillas de diferentes poblaciones de cuatro especies de gramíneas nativas de patagonia : un estudio de caso en el noroeste de Chubut
Nagahama, Nicolas; Garcia Martinez, Guillermo Carlos; Buduba, Carlos Guillermo; Opazo, Walter Javier; Caruso, Cecilia Alejandra; Ciari, Georgina (2016)Germinative variability of seeds from different populations of four species of native grasses from Patagonia: a case study in northwestern Chubut. In this study, we analyzed the quality and germination behavior of seeds ...