17 results for Nitellopsis obtusa (starry stonewort)

Impact ID Scientific Name Impact Type Study Type Study Location Impact Description Geographic Location Reference
3993 Nitellopsis obtusa Competition Experimental Field When starry stonewort (Nitellopsis obtusa) is abundant, macrophyte species richness is decreased. Onondaga and Courtland Counties, New York, USA 29177
3994 Nitellopsis obtusa Competition Experimental Field Macrophyte biomass is lower when starry stonewort (Nitellopsis obtusa) is abundant. Onondaga and Cortland Counties, New York, USA 29177
3995 Nitellopsis obtusa Competition Experimental Field Starry stonewort (Nitellopsis obtusa) displaces macrophytes across three depth intervals (shallow, <1 m; intermediate, 1 to 2 m; and deep, >2 m) in the four lakes that were sampled. Onondaga and Cortland Counties, New York, USA 29177
4003 Nitellopsis obtusa Competition Observational Field When starry stonewort (Nitellopsis obtusa) is abundant, it appears to extirpate all other submerged aquatic vegetation by outcompeting them for light and other resources. Michigan, USA 19736
4004 Nitellopsis obtusa Competition Observational Field Starry stonewort (Nitellopsis obtusa) outcompetes all other native and nonnative aquatic plant species in Michigan, including Eurasian watermilfoil (Myriophyllum spicatum), fanwort (Cabomba caroliniana), and curly leaf pondweed (Potamogeton crispus). Michigan, USA 19736
4005 Nitellopsis obtusa Competition Observational Field When starry stonewort (Nitellopsis obtusa) dominates, biomass of all other competing species declines significantly. Michigan, USA 19736
4013 Nitellopsis obtusa Competition Anecdotal Field It is speculated that the upper parts of starry stonewort (Nitellopsis obtusa) mats compete with phytoplankton for nutrients and other resources. Michigan, USA 19736
4015 Nitellopsis obtusa Competition Observational Field Starry stonewort (Nitellopsis obtusa) impacts fish spawning by creating a physical barrier and restricting access to substrates used as nesting habitat. This reduces the nesting area, density of nests, and can lead to the elimination of spawning altogether in highly infested areas. MIchigan, USA 19736
4559 Nitellopsis obtusa Competition Anecdotal N/A Reduces Species Richness and Diminishes Plant Community Biodiversity Great Lakes 36858
4563 Nitellopsis obtusa Competition Anecdotal N/A Nitellopsis 'meadows' form dense benthic barriers Great Lakes 36861
4564 Nitellopsis obtusa Competition Anecdotal N/A Nitellopsis obtusa alters or eliminates native submerged aquatic plant communities Great Lakes 36861
7543 Nitellopsis obtusa Competition Observational Field When it was first reported, Nitellopsis obtusa was the ninth most frequently collected macrophyte in the St. Clair-Detroit River system, which could indicate it is outcompetiting native species. Detroit River, USA 703
7544 Nitellopsis obtusa Competition Observational Field Nitellopsis obtusa was recorded at a peak biomass of 259 g m-2 in September, when many other macrophytes were declining, giving it a competitive advantage. Detroit River, USA 17617
7545 Nitellopsis obtusa Competition Anecdotal N/A Once established in inland lakes, Nitellopsis obtusa forms dense mats of vegetation that completely cover the lake bottom. Mats of N. obtusa correspond with a dramatic decrease in the biomass of competing species. Although specific surveys have not been conducted yet, there is serious concern for inland lake populations of native species that are dependent on lake bottom habitat, including minnows, logperch, darters, clams, and other invertebrates. Michigan, USA 19736
7546 Nitellopsis obtusa Competition Observational Field There is also research indicating that macrophyte species, such as Nitellopsis obtusa, have a strong influence on phytoplankton through allelopathic interactions. Lake Scharmützelsee, Germany 35283
7547 Nitellopsis obtusa Competition Observational Field In Sweden, Nitellopsis obtusa dies off in the winter, which reduces the ability of slow colonizers like the isopod Asellus and amphipod Gammarus to establish significant populations in this habitat. As a result, it typically hosts many chironomids, while Chara tomentosa harbors more amphipods and isopods. Lake Tåkern, Sweden 17612
7548 Nitellopsis obtusa Competition Anecdotal N/A Dense mats of Nitellopsis obtusa directly impact the habitat used by native fish for spawning. Bass and sunfish are known to regularly spawn in dense growths of native Chara species, but these spawning behaviors did not occurs in correspondingly dense growths of N. obtusa. Michigan, USA 19736

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