Effects of livestock exclusion on density, survival and biomass of the perennial sagebrush grass Hymenachne pernambucense (Poaceae) from a temperate fluvial wetland
| Autor: | Ruben Dario Quintana, Andrea Laura Magnano, Elizabeth Nora Astrada, Ricardo Vicari, Pamela Krug, Analía Soledad Nanni |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Population Tiller (botany) Forage 010603 evolutionary biology 01 natural sciences Population density POPULATION ECOLOGY Ciencias Biológicas parasitic diseases Grazing GRAZING IMPACT education Ecology Evolution Behavior and Systematics Nature and Landscape Conservation ARGENTINA Biomass (ecology) education.field_of_study biology Ecology business.industry FRESHWATER MARSHES food and beverages Hymenachne Ecología biology.organism_classification Agronomy Livestock business Delta of the Paraná River CIENCIAS NATURALES Y EXACTAS 010606 plant biology & botany |
| Zdroj: | Acta Oecologica. 86:72-78 |
| ISSN: | 1146-609X |
| DOI: | 10.1016/j.actao.2017.12.006 |
| Popis: | In Argentina, the intensification of soybean production has displaced a substantial proportion of cattle ranching to fluvial wetlands such as those in the Delta of the Paraná River. Cattle grazing affects structure and dynamics of native forage plants but there is little information on this impact in populations from fluvial wetlands. This study addresses the effect of cattle ranching on density, survival, mean life-span and aerial biomass of Hymenachne pernambucense (Poaceae), an important forage species in the region. The study was carried out monthly for one year in permanents plots subject to continuous grazing and plots excluded from grazing in the Middle Delta of the Paraná River. In plots excluded from grazing, tillers showed significantly higher population density and survival, and a two-fold increase in mean life-span, while continuous grazing decreased survival of cohorts. The largest contribution to tiller density in ungrazed and grazed populations was made by spring and summer cohorts, respectively. Total and green biomass were significantly higher in the ungrazed population, with highest differences in late spring-early summer. Cattle grazing affected the relationship between tiller density and green biomass suggesting that cattle prefer sprouts because they are more palatable and nutritious than older tissue. Fil: Magnano, Andrea Laura. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina Fil: Nanni, Analía Soledad. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Krug, Cecilia Pamela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina Fil: Astrada, Elizabeth Nora. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina Fil: Vicari, Ricardo. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina Fil: Quintana, Ruben Dario. Universidad Nacional de San Martín. Instituto de Investigación en Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
| Databáze: | OpenAIRE |
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