Producción CyT
103th Ecological Society of America annual meeting - Abiotic and biotic factors mediate the impact of invasive wild boar on soil function
Congreso
Autoría:
BARRIOS GARCIA MOAR, MARIA NOELIA ; Gonzalez-Polo, Marina ; Simberloff, Daniel ; Classen, AimeeFecha:
2018Editorial y Lugar de Edición:
ESAResumen *
While numerous studies have focused on the impact of invasive species on above- and below-groundproperties, very few have explored the mechanisms by which invasive mammals can alter soil function. Wildboar is one of the most widely introduced invasive mammals of the world. By overturning extensive areas ofvegetation, wild boar feed on belowground roots, arthropods, and fungi. This physical disturbance of the soilprofile alters plant community decreasing primary productivity as well as organic matter decomposition rates.Using a 7-year old exclosure experiment, we assessed the pathways by which invasive wild boar decreaseddecomposition rates in Patagonia, Argentina. Specifically, we measured soil temperature, moisture, bulkdensity,and respiration in the field; and collected 56 soil samples in fresh and unrooted patches outside andinside the exlosures, to extract soil micro-arthropods, and assess in the lab substrate-induced respiration,microbial enzyme activity as well as a lab-incubated decomposition rate.Rooting disturbance decreased soil moisture by 18% and respiration by 30% in the field, but had no effect onsoil micro-arthropod, microbial enzyme activity, substrate-induced respiration, and lab-incubateddecomposition rate in Austrocedrus and Nothofagus plant communities. These results suggest that soilmicrobial community functioning is intact under laboratory conditions, and that differences in the field aremediated by changes in abiotic factors (soil moisture). In contrast, rooting in shrublands decreased soilmicro-arthropod richness and abundance by 80%, and soil moisture by 13%, and had no effect on the othersoil properties we measured. These results show that rooting disturbance by wild boar in shrublands canreduce decomposition rates by altering soil fauna. Taken together our findings indicate that rootingdisturbance by invasive wild boar can alter soil function by different mechanisms in different plantcommunities. These results reveal that wild boar impacts can be more complex to predict than previouslythought. Información suministrada por el agente en SIGEVAPalabras Clave
WILD BOARSOIL FAUNASOIL RESPIRATIONDECOMPOSITION RATE