| Impact ID |
Scientific Name
|
Impact Type
|
Study Type
|
Study Location
|
Impact Description
|
Geographic Location
|
Reference
|
|
3143
|
Hygrophila polysperma
|
Competition
|
Experimental
|
Laboratory
|
Hygrophila polysperma out-competed Ludwigia repens in biomass growth in tank trials
|
|
31299
|
|
7075
|
Hygrophila polysperma
|
Competition
|
Experimental
|
Laboratory
|
Hygrophila polysperma has outcompeted Hydrilla verticillata, another nonindigenous nuisance macrophyte, in the flowing waters of Florida canals; however, it appears to be a poorer competitor in static waters.
|
|
32661
|
|
7076
|
Hygrophila polysperma
|
Competition
|
Observational
|
Field
|
In contrast to the competitive ability of Hygrophila polysperma observed in the southeastern United States, scientists in New Zealand found H. polysperma to be a poor competitor when grown with New Zealand native macrophytes, Egeria densa or Lagarosiphon major (native to South America and southern Africa, respectively).
|
New Zealand
|
42130
|
|
7077
|
Hygrophila polysperma
|
Competition
|
Observational
|
Field
|
Sampling on the San Marcos River, TX found that Hygrophila polysperma was one of the most-abundant species in terms of biomass, accounting for up to a quarter of total plant biomass sampled. The authors observed the formation of large floating mats of H. polysperma, which are considered to be detrimental to native vegetation, decreasing sunlight availability, and creating anoxic conditions once decomposition occurs.
|
San Marcos River, Texas
|
22751
|
|
7078
|
Hygrophila polysperma
|
Competition
|
Anecdotal
|
N/A
|
Hygrophila polysperma may form dense single species stands that often do not provide ideal habitat or food for native wildlife. These native wildlife populations may be forced to relocate or perish, ultimately resulting in a loss of biodiversity and a disruption in the balance of the ecosystem.
|
|
31293
|