14 results for Hydrilla verticillata (hydrilla)

Impact ID Scientific Name Impact Type Study Type Study Location Impact Description Geographic Location Reference
2978 Hydrilla verticillata Competition Anecdotal Field Hydrilla verticillata grows faster than native plants in the Potomac River/Chesapeake Bay area and may reduce their seasonal abundance. 10138
3071 Hydrilla verticillata Competition Observational Field Hydrilla impacted four lakes in New Zealand, forming dense mono-specific stands that have displaced native plants. 33834
3077 Hydrilla verticillata Competition Anecdotal Field Hydrilla are considered to cause the loss of native species through competition and displacement. 33837
4055 Hydrilla verticillata Competition Experimental Laboratory Hydrilla verticillata grew in biomass and density at a faster rate than Elodea canadensis when planted in various ratios. 33834
7038 Hydrilla verticillata Competition Anecdotal N/A Hydrilla verticillata is not easy to detect until it fills the lake it infests and tops out at the surface; it grows in thick mats, and shades out or outcompetes ecologically important native submersed plants including Potamogeton pondweeds, tapegrass (Vallisneria americana), and coontail (Ceratophyllum demersum). 10285
7039 Hydrilla verticillata Competition Anecdotal N/A Hydrilla verticillata grows aggressively and competitively, spreading through shallower areas and forming thick mats in surface waters that block sunlight penetration to native plants below. 10285
7040 Hydrilla verticillata Competition Observational Field In the southeast, hydrilla effectively displaces beneficial native vegetation. Southeastern U.S. 10135
7041 Hydrilla verticillata Competition Observational Field Research found that sportfish reduced in weight and size when Hydrilla verticillata occupied the majority of the water column, suggesting that foraging efficiency was reduced as open water space and natural vegetation gradients were lost. Lake Wales, Polk County, Florida 10511
7042 Hydrilla verticillata Competition Anecdotal N/A Hydrilla verticillata infestations can cause a reduction or the extirpation of populations of native aquatic species. Hydrilla forms a dense mat of vegetation at the water surface and limits light penetration degrading or eliminating all layers below. 42106
7043 Hydrilla verticillata Competition Observational Field Hydrilla verticillata is highly adaptive to the environment and competitive with most other aquatic plants. The growth habit of hydrilla enables it to compete effectively for sunlight. It can elongate up to 1 inch per day, and produces the majority of its stems in the upper 2–3 feet of water. This mat of vegetation intercepts sunlight and leads to exclusion of other aquatic plants. Orange County, Florida 42107
9223 Hydrilla verticillata Competition Experimental Field Hydrilla verticillata was able to reach greater depths with increased water clarity. It was able to grow at lower depths than native Egeria najas, mostly likely allowing it to escape wave disturbance Itaipu Reservoir, Paraná River, Brazil 42764
9224 Hydrilla verticillata Competition Observational Field Research from South America, indicate Hydrilla verticillata invaded sites regardless of species diversity and whether dominant native macrophytes were already present. Rosana Reservoir, Brazil 42772
9225 Hydrilla verticillata Competition Experimental Field Invasive Hydrilla verticillata reduced the growth of native Egeria najas regardless of sediment type. Researchers believe this indicated E. najas will be unable colonize sites where H. verticillata is abundant. Paraná River, Brazil 42771
9226 Hydrilla verticillata Competition Experimental Field Hydrilla verticillata had a higher capacity to take up and assimilate nitrate than native Vallisneria neotropicalis, giving it a competitive advantage during the growing season. Vallisneria neotropicalis Lake Stone, Florida, USA 42767

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