Ganadería en humedales. Respuestas de la vegetación a la exclusión del pastoreo en tres tipos de ambientes en un paisaje del Delta del Paraná.

MAGNANO, ANDREA; VICARI, RICARDO L.; ASTRADA, ELIZABETH; QUINTANA, RUBEN DARIO

RASADEP

Asociación Argentina de Ecología de Paisajes

Lugar: Buenos Aires; Año: 2013 vol. 5 p. 137 - 148

1853-8045

Herbivores may profoundly influence on structure and functioning of ecosystems impacting on physical environment and plants and animals communities. The effect of livestock grazing, by exclusion, on floristic composition, diversity and aboveground biomass dynamic were studied on three environments located in different portions of topographical gradient (levee, high mid-slope and down mid-slope) in a wetland of the Paraná river Delta. In addition, these systems were analyzed for pre and post flood period. Cattle grazing had an effect on studied communities and biomass, while with exclusion was observed, despite the short period, a tendency to recover the features of the original environments. Also the post flood period data show that grazing next to this event had a negative synergistic effect that influenced on the growth of the dominant specie (Hymenachne pernambucense) with high forage value in down mid-slope and caused the decrease of diversity for the others coverages. The differences in green biomass were influenced by the dynamics of communities than the herbivory of palatable species. The data generated in this work are great value considering that yet there are no records for this region and the background in riverine wetlands are few. In addition along with the work we are performing. Furthermore, these results together with those who continued to perform from the year2011 will generate an important base of information useful for generating management guidelines that contribute to the establishment of a sustainable livestock system for the region. Key words: Wetland, Paraná Delta, grazing, diversity, biomass, herbivory, flood.