| Impact ID |
Scientific Name
|
Impact Type
|
Study Type
|
Study Location
|
Impact Description
|
Geographic Location
|
Reference
|
|
3434
|
Myriophyllum aquaticum
|
Competition
|
Anecdotal
|
N/A
|
Parrot Feather can form dense vegetation that can (hinder water circulation and) displace native vegetation.
|
|
33980
|
|
3446
|
Myriophyllum aquaticum
|
Competition
|
Experimental
|
Field
|
Plots that did not contain M. aquaticum had significantly higher plant species richness than heavily invaded C plots. There was a 57% decrease in species richness when comparing uninvaded plots with those invaded with M. aquaticum.
|
|
32943
|
|
3447
|
Myriophyllum aquaticum
|
Competition
|
Experimental
|
Field
|
Parrots feather can form dense canopies that block sunlight and oxygen exchange, and as a result out compete native species. "A strong negative relationship was found between invasive species cover and submerged species cover, and between invasive species cover and floating (leaved) species cover in all ponds and among invaded ponds only."
|
|
32943
|
|
5312
|
Myriophyllum aquaticum
|
Competition
|
Observational
|
Field
|
Myriophyllum aquaticum fragments were introduced with native vegetation in a habitat restoration project in Erhai Lake, and soon overtook the other plants, becoming the dominant vegetation type.
|
Erhai Lake, Yunan, China
|
38234
|
|
7093
|
Myriophyllum aquaticum
|
Competition
|
Observational
|
Field
|
Stiers et al. (2011) compared Belgian lake sites that were heavily invaded (90-100% cover), semi-invaded (~25% cover) and uninvaded by Myriophyllum aquaticum, and found that native species richness was 57% lower in heavily invaded sites relative to uninvaded sites. M. aquaticum cover was also negatively correlated with invertebrate species richness and abundance.
|
Belgium
|
38185
|
|
7094
|
Myriophyllum aquaticum
|
Competition
|
Observational
|
Field
|
Plants that are rare (Utricularia vulgaris) and vulnerable (Hydrocharis morsus-ranae) IUCN Red List species in Belgium were absent in heavily invaded Myriophyllum aquaticum sites but present in semi-invaded sites.
|
Belgium
|
38185
|
|
7095
|
Myriophyllum aquaticum
|
Competition
|
Experimental
|
Laboratory
|
In China, Myriophyllum aquaticum outcompeted native species (Hydrilla verticillata, M. oguraense, and M. ussuriense) in the laboratory with respect to relative growth rate, with the most significant results on high-nutrient sediment.
|
|
32722
|
|
7096
|
Myriophyllum aquaticum
|
Competition
|
Experimental
|
Laboratory
|
In a mesocosm study, yield (biomass) of Myriophyllum aquaticum was positively related to tissue nitrogen content, suggesting that high levels of nitrogen contribute to nuisance levels of growth. However, high levels of phosphorus favored the growth of algae (superior competitors in phosphorus uptake) causing shading in the water column and suppressing the growth of M. aquaticum.
|
|
31239
|