Ecology of Invasive Melilotus albus on Alaskan Glacial River Floodplains

Ecology of Invasive Melilotus albus on Alaskan Glacial River Floodplains

Melilotus albus (white sweetclover) has invaded Alaskan glacial river floodplains. We measured cover and density of plant species and environmental variables along transects perpendicular to the Nenana, Matanuska, and Stikine Rivers to study interactions between M. albus and other plant species and...

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Veröffentlicht in:Arctic, Antarctic, and Alpine Research. - Taylor & Francis, Ltd., 1999. - 43(2011), 3, Seite 343-354
1. Verfasser: Conn, Jeffery S. (VerfasserIn)
Weitere Verfasser: Werdin-Pfisterer, Nancy R., Beattie, Katherine L., Densmore, Roseann V.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2011
Zugriff auf das übergeordnete Werk:Arctic, Antarctic, and Alpine Research
Schlagworte:Physical sciences Biological sciences Religion
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520 |a Melilotus albus (white sweetclover) has invaded Alaskan glacial river floodplains. We measured cover and density of plant species and environmental variables along transects perpendicular to the Nenana, Matanuska, and Stikine Rivers to study interactions between M. albus and other plant species and to characterize the environment where it establishes. Melilotus albus was a pioneer species on recently disturbed sites and did not persist into closed canopy forests. The relationships between M. albus cover and density and other species were site-specific. Melilotus albus was negatively correlated with native species Elaeagnus commutata at the Nenana River, but not at the Matanuska River. Melilotus albus was positively correlated with the exotic species Crépis tectorum and Taraxacum officinale at the Matanuska River and T. officinale on the upper Stikine River. However, the high density of M. albus at a lower Stikine River site was negatively correlated with T. officinale and several native species including Lathy rus japonicus var. maritimus and Salix alaxensis. Glacial river floodplains in Alaska are highly disturbed and are corridors for exotic plant species movement. Melilotus albus at moderate to low densities may facilitate establishment of exotic species, but at high densities can reduce the cover and density of both exotic and native species. 
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