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Invasibility Patterns of Knotgrass (Paspalum distichum) in Portuguese Riparian Habitats

Published online by Cambridge University Press:  20 January 2017

Francisca C. Aguiar ,
M. Teresa Ferreira ,
António Albuquerque  and
Ivan Bernez
Francisca C. Aguiar*
Affiliation:
Instituto Superior de Agronomia; Departamento de Engenharia Florestal, Tapada da Ajuda, 1349-017 Lisbon, Portugal
M. Teresa Ferreira
Affiliation:
Instituto Superior de Agronomia; Departamento de Engenharia Florestal, Tapada da Ajuda, 1349-017 Lisbon, Portugal
António Albuquerque
Affiliation:
Instituto Superior de Agronomia; Departamento de Engenharia Florestal, Tapada da Ajuda, 1349-017 Lisbon, Portugal
Ivan Bernez
Affiliation:
Laboratoire d' Ecologie et Sciences Phytosanitaires, ENSAR, 65 Rue de Saint-Brieuc, 35042 Rennes, France
*
Corresponding author's E-mail: fraguiar@isa.utl.pt
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Abstract

Spatial patterns of the exotic riverine knotgrass (Paspalum distichum L.) were examined in Mediterranean river basins in Southwestern Iberia. The major goals of this study were to assess the degree of invasibility of riparian habitats by this species and to determine the influence of environmental factors and human-induced disturbances that this knotgrass has on both the landscape and the habitat scales. The present study demonstrates the ability of knotgrass to invade riparian habitats in Portuguese freshwater ecosystems. However, most of the spatial variation of the knotgrass cover seemed to be driven by local factors, such as fine sediment enrichment and the fragmentation of riparian woods, and by other anthropogenic interferences in relation to both the fluvial system and the surrounding landscape.

Keywords

KnotgrassPaspalum distichum L. # PASDSExotic specieshuman disturbancesenvironmental variablesPASDSMediterranean basin
Type
Symposium
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 509 - 516
Copyright
Copyright © Weed Science Society of America 

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