The non-native charophyte Nitellopsis obtusa (starry stonewort) influences shifts in macrophyte diversity and community structure in lakes across a geologically heterogeneous landscape

Harrow-Lyle, Tyler J.; Kirkwood, Andrea E.

doi:10.1007/s10452-022-09950-0

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Starry stonewort has a similar growth habitat and exhibits characteristics that would allow it to become an ecosystem engineer like hydrilla and Eurasian watermilfoil, most notably the ability to develop a dense surface canopy that restricts light penetration, water movement, and gas exchange; and the production of bulbils. Starry stonewort has been seen to lower macrophyte species richness in multiple lakes as its biomass increased at various depths (Brainard andSchulz 2017, Harrow-Lyle andKirkwood 2022). Dense beds of starry stonewort may limit fish spawning habitat as well as reduce the longterm viability of benthic organisms via oxygen depletion during senescence (Brainard and Schulz 2017).…”

Section: Resultsmentioning

confidence: 99%

Environmental factors influencing biomass and bulbil production of Nitellopsis obtusa in Lake Koronis, Stearns County, Minnesota

Carver,

Wersal,

Gebhart

2024

J Aquat Plant Manage

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Starry stonewort [Nitellopsis obtusa (Desvaux) J. Groves] is a green macroalga in the family Characeae that is native to Eurasia. In the United States it has invaded many waterbodies across the northern tier from New York to Minnesota. In Minnesota, starry stonewort often grows later into the growing (September to December) season than most native species; however, the environmental factors that influence this life history trait are not well understood. Starry stonewort was harvested every 3 wk from May to November in 2020 and 2021 from four locations in Lake Koronis, Stearns County, MN. Light, water pH, and water temperature were also collected to correlate these variables to starry stonewort growth. Rhizoid biomass had weak negative correlations with temperature (rs ¼ 0.19) and pH (rs ¼ 0.14). Bulbil biomass had weak negative correlations with temperature (rs ¼ 0.24), pH (rs ¼ 0.31), and light transmittance (rs ¼ 0.11). Bulbil density had weak negative correlations with temperature (rs ¼ 0.23), pH (rs ¼ 0.29), and light transmittance (rs ¼ 0.10). Bulbil production was highest between October and November of each year. Bulbil biomass and density was lower in 2020 (4.6 g m2 and 1,229 bulbils m2) thanin2021(14.7gm2 and 5,211 bulbils m2). The average annual bulbil density was 1,537 bulbils m2 and ranged from 0 to 157,000 bulbils m2. The ability of starry stonewort to grow in dense mats and produce large quantities of bulbils contributes to the difficulty of controlling infestations. Bulbils are a method of spatial and temporal distribution that can allow for recolonization of previously treated areas.

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Section: Resultsmentioning

confidence: 99%

Environmental factors influencing biomass and bulbil production of Nitellopsis obtusa in Lake Koronis, Stearns County, Minnesota

Carver,

Wersal,

Gebhart

2024

J Aquat Plant Manage

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“…also can be abundant in turbid lakes with no macrophytes (Brodersen et al., 2001). The establishment and intensification of the invasive macrophytes Eurasian Milfoil ( Myriophyllum spicatum ) in Ontario, Quebec and British Columbia (Simkovic, 2020) and Starry Stonewort ( Nitellopsis obtusa ) in Ontario (Harrow‐Lyle & Kirkwood, 2022) also may be contributing to the increases in macrophyte‐associated chironomids at many sites.…”

Section: Discussionmentioning

confidence: 99%

Changes in midge assemblages reflect climate and trophic gradients across north temperate and boreal lakes since the pre‐industrial period

Griffiths,

Jeziorski,

Antoniades

et al. 2023

Freshwater Biology

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North temperate and boreal lakes are affected by a complex suite of anthropogenic stressors, yet little is known about how these ecosystems are faring across the most lake‐rich nation, Canada. The NSERC Canadian Lake Pulse Network is the first large‐scale national survey of its kind, with the aim of assessing the health of Canadian lakes, determined by the deviation of key variables from baseline pre‐industrial conditions (pre‐1880 CE). We examined midge remains (chironomids and Chaoborus) from modern and pre‐industrial sediment intervals in 67 lakes, spanning a range of sizes, ecozones, and degrees of catchment land‐use change. A marked northwest/southeast divide was evident in the modern chironomid assemblages, which was partially associated with water quality, physiographical and climatic variables, with a small portion of the variance explained by geography alone. Between the pre‐industrial and modern sediment intervals, taxa typically found in warmer waters increased across the country (p < 0.001); this pattern also was evident in the littoral assemblages (p = 0.01), providing additional support for the influence of warming. Turnover in chironomid assemblages varied across trophic classes. Mesotrophic lakes showed increases in macrophyte‐associated taxa, whereas eutrophic lakes showed declines in littoral taxa, perhaps reflecting increased turbidity, and the increase of low‐oxygen‐tolerant profundal taxa in eutrophic lakes with high human impacts. Overall, the distribution and dynamics of chironomid assemblages across Canadian lakes appear to be strongly linked to changes in climate and deep‐water oxygen conditions.

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Modeling of suitable habitats for starry stonewort (Nitellopsis obtusa) in inland lakes in the Midwest and northeast U.S.A

et al. 2023

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The non-native charophyte Nitellopsis obtusa (starry stonewort) influences shifts in macrophyte diversity and community structure in lakes across a geologically heterogeneous landscape

Cited by 5 publications

References 34 publications

Environmental factors influencing biomass and bulbil production of Nitellopsis obtusa in Lake Koronis, Stearns County, Minnesota

Environmental factors influencing biomass and bulbil production of Nitellopsis obtusa in Lake Koronis, Stearns County, Minnesota

Changes in midge assemblages reflect climate and trophic gradients across north temperate and boreal lakes since the pre‐industrial period

Modeling of suitable habitats for starry stonewort (Nitellopsis obtusa) in inland lakes in the Midwest and northeast U.S.A

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