| Impact ID |
Scientific Name
|
Impact Type
|
Study Type
|
Study Location
|
Impact Description
|
Geographic Location
|
Reference
|
|
5601
|
Crassula helmsii
|
Competition
|
Anecdotal
|
N/A
|
Crassula helmsii can limit water circulation and change oxygen regimes outcompeting native species.
|
|
29344
|
|
5640
|
Crassula helmsii
|
Competition
|
Observational
|
Field
|
Crassula helmsii suppresses surrounding epiphytic and planktonic algae more than the effect of shade.
|
New Forest, England
|
29479
|
|
5641
|
Crassula helmsii
|
Competition
|
Anecdotal
|
N/A
|
In some areas of the United Kingdom this Crassula helmsii is highly invasive and it out-competes many native plant species by forming dense smothering mats of vegetation
|
|
29339
|
|
5642
|
Crassula helmsii
|
Competition
|
Observational
|
Field
|
Crassula helmsii shows extreme competitiveness, dominates many sites, and can cover the entire water surface.
|
New Forest, England
|
29479
|
|
5643
|
Crassula helmsii
|
Competition
|
Anecdotal
|
N/A
|
In neglected nursery tanks it was observed that Crassula helmsii took over and chocked out other plants in the tanks.
|
Greensted, Essex, Great Britian
|
29473
|
|
5644
|
Crassula helmsii
|
Competition
|
Observational
|
Field
|
Crassula helmsii was observed to outcompete Potomogeton spp. in England.
|
England
|
29340
|
|
5645
|
Crassula helmsii
|
Competition
|
Experimental
|
Laboratory
|
Crassulacean acid metabolism confers a competitive advantage for Crassula helmsii in relation to growth through carbon conservation.
|
|
29481
|
|
5646
|
Crassula helmsii
|
Competition
|
Observational
|
Field
|
Crassula helmsii suppresses germination of other species up to 83%, yet there was no effect on seed back and no loss of plant species on four ponds in England. However, the experiment was over a limited time scale.
|
England
|
29482
|
|
5650
|
Crassula helmsii
|
Competition
|
Anecdotal
|
N/A
|
Crassula helmsii reduced the abundance of Elodea spp. after the introduction into water bodies.
|
British Isles
|
39685
|
|
5651
|
Crassula helmsii
|
Competition
|
Observational
|
Field
|
It was observed that for every 10% increase in Crassula helmsii there was a 6% decrease in the amount of bare ground and 5% decrease in the amount of native vegetation.
|
New Forest, England
|
39943
|
|
5653
|
Crassula helmsii
|
Competition
|
Experimental
|
Laboratory
|
Crassula helmsii is able to remain green in the winter and able to continue photosynthetic activity in the colder months giving it a head start in the springtime. This in combination with the plants ability to grow in a emerged or submerged form gives it a competitive advantage over other species.
|
|
39643
|