Impact ID |
Scientific Name
|
Impact Type
|
Study Type
|
Study Location
|
Impact Description
|
Geographic Location
|
Reference
|
3425
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Experimental
|
Field
|
Parrot feather’s dense vegetation provides mosquito larvae a refuge from predation.
|
|
32697
|
3428
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Experimental
|
Field
|
"The results demonstrate a positive relationship between the abundance of immature Anopheles mosquitoes and the density of emergent stems of M. aquaticum. The consistent presence of Anopheles larvae in patches with plant densities of 500-600 stems m-2 or greater (Fig. 1) is further evidence that Myriophyllurn patches with high stem densities provide the best habitat conditions for immature Anopheles."
|
|
32698
|
3439
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Anecdotal
|
Field
|
The rivers of the Cape have experienced a decreased flow, relative to earlier years, mainly due to Myriophyllum and other aquatic weed growth.
|
|
32676
|
3443
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Anecdotal
|
Field
|
"The plant is also capable of increasing evapotranspiration. Water loss is doubled when the water surface is covered with M. aquaticum (H. H. Bosman, Department of Water Affairs and Forestry, Pretoria, 1996, pers. comm.)."
|
|
32668
|
3445
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Experimental
|
Field
|
"Water losses due to evapotransportation in the mesocosms colonized by M. aquaticum, B. subquadripara, E. polystachya and P. lanceolata were statistically similar and promoted increases between 1.54 and 2.21 times the free surface."
|
|
32710
|
3449
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Experimental
|
Field
|
"Because of their rapid growth, they can form dense canopies which occupy a large amount of space, they block sunlight and oxygen exchange and as a result outcompete native species. In full summer, the oxygen content felled to <5 mg/l in the underlying water layers of the dense canopies at some of our heavily invaded sites."
|
|
32943
|
3455
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Experimental
|
Field
|
"Quadrats where native plant species were dominant were similar to or had higher DO than areas with no vegetation. The lowest DO concentrations were observed in quadrats dominated by parrot feather, and were significantly lower than was observed for all native species or open areas."
|
|
33983
|
7102
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Anecdotal
|
N/A
|
Myriophyllum aquaticum can dramatically alter ecosystems by shading out algae in the water column.
|
|
32717
|
7103
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Observational
|
Field
|
In Germany, the infestation of Myriophyllum aquaticum mats created shaded conditions in shallow waters, and appeared to be correlated with a decline in native macrophyte diversity.
|
Germany
|
32654
|
7104
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Anecdotal
|
N/A
|
Dense infestations of Myriophyllum aquaticumcan rapidly overtake small ponds and sloughs, changing their physical and chemical properties, including impeding water flow, which can result in increased flood duration and intensity.
|
|
32717
|
7105
|
Myriophyllum aquaticum
|
Habitat Alteration
|
Observational
|
Field
|
Senescence of Myriophyllum aquaticum can leave a dense mat of decomposed plant litter and sediments at the bottom of heavily-invaded sites that may create unsuitable habitat for invertebrate colonization.
|
Belgium
|
38185
|