NDLI: Effects of experimental disturbances on a tropical freshwater marsh invaded by the African grass Echinochloa pyramidalis

Content Provider	Springer Nature Link
Author	López Rosas, Hugo MoreCasasola, Patricia Mendelssohn, Irving A.
Copyright Year	2006
Abstract	Perennial African C4 grasses are highly successful invaders in tropical and subtropical environments. One of these species, Echinochloa pyramidalis, has been introduced in the freshwater wetlands of the Mexican tropics. This alien species reduces biodiversity by replacing native species. The removal of non-indigenous species from invaded communities often requires different techniques such as physical, chemical, or biological controls. We evaluated the effects of mechanical (cutting or soil-disking) and chemical (spraying Round Up™ herbicide) disturbance treatments on the plant community of a freshwater marsh invaded by E. pyramidalis. We predicted that intense disturbance would eliminate this African grass from the experimental plots. Over a nine-month period, we analyzed species cover, richness, and diversity in experimental plots that received different disturbance treatments. Also, we measured the aerial biomass at the end of the experiment. The treatment that best reduced the dominance of E. pyramidalis and increased the diversity of native species was soil disking, but this was not enough to eliminate the grass. After nine months, E. pyramidalis recovered in all the treatments and again became the dominant species. To eliminate this species completely, it is necessary to recreate the natural topography and hydrology of the wetland and to select control mechanisms that disrupt those growth characteristics (e.g., rapid propagation from rhizomes and horizontal expansion via tillers) that make this grass more competitive than native species.
Starting Page	593
Ending Page	604
Page Count	12
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	26
Issue Number	2
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-01-01
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	biological invasion cattle grazing La Mancha Mexico non-indigenous grasses removal experiment Sagittaria lancifolia species richness and diversity Veracruz wetland management Freshwater & Marine Ecology Environmental Management Ecology Hydrogeology Coastal Sciences Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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