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Defoliation frequency affects morphophysiological traits in the bunchgrass Poa ligularis = La frecuencia de defoliación afecta las carcacterísticas morfofisiológicas en la gramínea perenne Poa ligularis
Gittins Lopez, Cecilia Gabriela; Busso, Carlos Alberto; Becker, Guillermo Fernando; Ghermandi, Luciana; Siffredi, Guillermo Lorenzo (Fundacion Romulo Raggio, 2010-11)Poa ligularis is an important forage in Patagonian rangelands. Populations of this perennial bunchgrass have been severely affected by overgrazing. We propose that increased defoliation frequencies will decrease (1) aerial- ... -
Una herramienta para monitorear sequías en regiones áridas y semiáridas de Patagonia Norte
Easdale, Marcos Horacio; Lopez, Dardo Ruben; Bianchi, Emilio; Bruzzone, Octavio Augusto; Villagra, Edgar Sebastian; Siffredi, Guillermo Lorenzo; Gaitan, Juan Jose; Umaña, Fernando; Oricchio, Patricio (Gerencia de Comunicación e Imagen Institucional, DNA SICC, INTA, 2012-08)La variabilidad ambiental es una característica de regiones pastoriles áridas y semiáridas, siendo la sequía uno de los principales problemas en sistemas ganaderos extensivos, con implicancias productivas y económicas tanto ... -
Linking ecosystem resistance, resilience, and stability in steppes of North Patagonia
Lopez, Dardo Ruben; Brizuela, Miguel Angel; Willems, Priscila Mabel; Aguiar, Martín Roberto; Siffredi, Guillermo Lorenzo; Bran, Donaldo Eduardo (Elsevier, 2013-01)The main objective of an ecosystem sustainable management is to preserve its capacity to respond and adapt to current disturbances and/or future changes, and maintain the provision of environmental goods and services. Two ... -
Local adaptation along a sharp rainfall gradient occurs in a native Patagonian grass, Festuca pallescens, regardless of extensive gene flow
Lopez, Aldana Soledad; Lopez, Dardo Ruben; Caballe, Gonzalo; Siffredi, Guillermo Lorenzo; Marchelli, Paula (Elsevier, 2020-03)Increasing global aridity combined with changing environmental conditions might cause irreparable alterations in arid and semiarid ecosystems. Knowledge of within-species genetic diversity and adaptive responses, especially ... -
Phylogenetic relationships and intraspecific diversity of a North Patagonian Fescue: evidence of differentiation and interspecific introgression at peripheral populations
Lopez, Aldana; Azpilicueta, Maria Marta; Lopez, Dardo Ruben; Siffredi, Guillermo Lorenzo; Marchelli, Paula (2018-03)Peripheral sites usually offer suboptimal conditions for species with wide distributions, where expression of phenotypic variability and potential interspecific hybridization might be enhanced. The Patagonian steppe, the ... -
What do domestic livestock eat in northern Patagonian rangelands?
Villagra, Edgar Sebastian; Pelliza, Alicia; Willems, Priscila Mabel; Siffredi, Guillermo Lorenzo; Bonvissuto, Griselda (CSIRO Publishing, 2013-02)The Patagonian rangelands are dominated by steppes interspersed with meadows (locally called mallines), which are small but permanently humid areas, characterised by high spring–summer quality and productivity of grasses ...