Community Ecology
Volume/Issue:
Volume 15: Issue 1
Local and intermediated-intensity soil disturbances increase the colonization and expansion dynamics of an invasive plant in Southern Patagonian rangelands
Authors: R.B. Rauber, P.A. Cipriotti, and M.B. Collantes 1
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  • 1 CONICET Laboratorio de Ecología de Pastizales, Museo Argentino de Ciencias Naturales Buenos Aires Argentina
  • 2 Instituto Nacional de Tecnología Agropecuaria (INTA) Villa Mercedes San Luis Argentina
  • 3 Universidad de Buenos Aires / CONICET Dpto. de Métodos Cuantitativos y Sistemas de Información, IFEVA, Facultad de Agronomía Buenos Aires Argentina
  • 4 Instituto Nacional de Tecnología Agropecuaria (INTA) Ruta 7 y 8. Villa Mercedes 5730 San Luis Argentina
DOI:
https://doi.org/10.1556/comec.15.2014.1.9
Page Count:
87–93
Publication Date:
01 Jun 2014
Online Publication Date:
14 Mar 2014
Article Category:
Research Article
Restricted access

Disturbances are important drivers in natural ecosystems, affecting the vegetation structure and functioning. Invasions of exotic plant species are often associated to disturbances in a complex manner, because they depend on the type, intensity, spatial and temporal arrangement of disturbances, and the particular abiotic and biotic context. Field studies that evaluate the dynamics of plant invasions under different disturbance regimes have a great importance for the understanding of the disturbance effects on invasion spread. In this work we evaluated, through a field manipulative experiment, the early colonization and expansion dynamics of an aggressive invader of grasslands, Hieracium pilosella L., under two disturbance types. We used a split-plot experiment by crossing three levels for a local, sporadic, of increasing intensity disturbance [i.e., 1- undisturbed, 2- vegetation mowing, and 3- ploughing], within two levels for an extensive and chronic disturbance (i.e., grazed and ungrazed). In the range of intensities of disturbance evaluated, the intermediate intensity (i.e., mowing) accelerated the colonization when it is grazed and the expansion of H. pilosella in ungrazed condition. In contrast, lower and higher intensity disturbances, such as ungrazed and ploughing treatments decelerated both invasion processes. Changes in resource availability, interspecific competition and particular characteristics of the invader, i.e., high light requirements, prostrate growth and the presence of stolons, could explain these early invasion patterns.

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Cover Community Ecology
Community Ecology An Interdisciplinary Journal Reporting Progress in Community and Population Studies
Print ISSN:
1585-8553
Online ISSN:
1588-2756
Keywords:
Exotic species; Hieracium pilosella ; Plant invasion; Plant spread; Sheep grazing

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