Response of the invasive alga starry stonewort (<i>Nitellopsis obtusa</i>) to control efforts in a Minnesota lake

Glisson, Wesley J.; Wagner, Carli K.; McComas, Steven R.; Farnum, Kevin; Verhoeven, Michael R.; Muthukrishnan, Ranjan; Larkin, Daniel J.

doi:10.1080/10402381.2018.1442893

Cited by 11 publications

(12 citation statements)

References 44 publications

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“…To date, there are limited published studies that assess the impacts of herbicides and algaecides on starry stonewort bulbil viability. In the Great Lakes Region, there is a high innate viability (> 86%) (Glisson et al 2018;Pokrzywinski et al 2020) of natural bulbils and this is similar to the viability of untreated controls reported in this research (> 90%). These findings support the notion that starry stonewort populations rely on bulbil production for growth within an invaded waterbody and expansion to adjacent waterbodies.…”

Section: Discussionsupporting

confidence: 87%

“…The decreased viability is likely due to the direct exposure to each product, rather than the potential translocation of the product via the rhizoids as these were primarily contact herbicides. For example, Glisson et al (2018) used a different copper ethanolamine complex (copper EAs) algaecide formulation for direct application in areas of Lake Koronis, MN, at approximately half the concentration applied in this study. Glisson et al (2018) found that after in-lake algaecide exposure, bulbil viability remained high.…”

Section: Discussionmentioning

confidence: 99%

“…Chemical management of starry stonewort has demonstrated some opportunity for success in the field, though more data are needed to understand the impact of growth stage, biovolume and bulbil density on treatment efficacy -along with the duration of control. Documented field or mesocosm scale results are either non-existent to date or limited by confounding factors and/or a constrained number of tested products, showing mixed efficacy (Glisson et al 2018 alter charge properties of resulting copper complexes to passively penetrate cell membranes (Stauber and Florence 1987;Strauss and Tucker 1993;Mastin and Rodgers 2000). Increased algaecidal efficacy has been documented with chelated formulations compared with copper sulfate (Bishop and Rodgers 2012;Calomeni et al 2014;Iwinski et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Chemical management strategies for starry stonewort : a mesocosm study

Pokrzywinski¹,

Bishop²,

Grasso³

et al. 2021

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US Environmental Protection Agency (USEPA) approved algaecides and herbicides are frequently utilized to manage nuisance algae and aquatic macrophytes. However, there is limited information available on the effectiveness of these products for the management of starry stonewort. Thus, the goal of this research was to discern effective chemical control products for later growth stages of starry stonewort using mesocosm studies. Eleven treatments were evaluated using various combinations of four copper-based products, endothall, diquat, and carfentrazone – all with USEPA registrations for use in aquatic sites. To assess treatment efficacy, water quality, photophysiology, biomass changes, and bulbil viability were evaluated. Nine of the eleven treatments yielded lower dissolved oxygen concentrations and higher specific conductance when compared to the control. Photophysiological response varied by condition, but seven of eleven treatments resulted in significantly lower fluorescent and maximum fluorescent yield. Five of these also exhibited significantly lower average photosynthetic yields, with combination treatments resulting in more drastic decreases. Ten of the eleven treatments had significantly less biomass compared to the control when measured via wet weight; however, only four treatments were significant when measured via dry weight. Lastly, all conditions utilizing copper-based products significantly reduced bulbil viability while non-copper products had no impact.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical management strategies for starry stonewort : a mesocosm study

Pokrzywinski¹,

Bishop²,

Grasso³

et al. 2021

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“…Chemical controls include copper-, diquat-and endothall-based algaecides, with some level of effect reported on starry stonewort at smaller scales in a single growing season (Aquatic Weed Control 2015; Glisson et al 2018;Larkin et al 2018). For example, aggressive chemical applications in June, July, and August in two Indiana lakes temporarily controlled starry stonewort for a season, but no method achieves longterm control, and starry stonewort populations are expanding (Aquatic Weed Control 2015).…”

Section: Chemical Controlmentioning

confidence: 99%

“…For example, aggressive chemical applications in June, July, and August in two Indiana lakes temporarily controlled starry stonewort for a season, but no method achieves longterm control, and starry stonewort populations are expanding (Aquatic Weed Control 2015). Applications of chelated coppers in a Minnesota lake provided mixed results, with starry stonewort biomass greatly reduced during the initial early-season application only to prove more resistant to a second treatment later in the growing season (Glisson et al 2018). Current techniques require multiple applications and are nonselective against nontarget and native vegetations.…”

Section: Chemical Controlmentioning

confidence: 99%

Aligning research and management priorities for Nitellopsis obtusa (starry stonewort)

Pokrzywinski¹,

Getsinger²,

Steckart³

et al. 2020

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In 2018, the US Army Corps of Engineers and Washington and Waukesha Counties in Wisconsin hosted a workshop on the invasive macroalga starry stonewort (Nitellopsis obtusa). Leading water resource managers (agencies and commercial applicators), researchers, regulators, and other interested parties discussed issues surrounding starry stonewort invasions in the Great Lakes Region (GLR). Technical sessions presented information on current research, invasion monitoring, early detection, rapid-response efforts, and operational management activities. Research summaries included invasion in Lake Ontario, prediction of invasion risk in Minnesota and Wisconsin using water chemistry data, and bulbil efficacy and distribution modeling in New England. In addition, the workshop offered summaries of attempted chemical and mechanical control tactics. Following presentations on previous studies, workshop participants identified research and management priorities. Critical research gaps identified from this workshop include (a) better understanding of the biology, invasion ecology, and management of starry stonewort; a greater understanding of distribution and movement, especially in the Great Lakes basin; enhanced population monitoring, applied research, and management strategies; and increased technical cooperation across government, academia, industry, and nonprofit organizations. Conclusions from this meeting will help prioritize future efforts focused on the adaptive management of starry stonewort in the United States and Canada. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.

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The impact of drought duration on two Potamogeton species with different growth forms

Daumal,

Oosterhuis,

Verhofstad

et al. 2024

Aquat Sci

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When facing new climate extremes, aquatic plant communities may experience more frequent or increasing durations of water shortages. Aquatic macrophytes of permanently inundated habitats (true hydrophytes) may lack the physiological or morphological characteristics that protect terrestrial plants from drying out. Aquatic hydrophytes with floating or emergent leaves are expected to be more resilient to droughts than completely submerged plants, as they have morphological characteristics adapted to air-exposed conditions. Therefore, we expected the latter to survive longer periods of air exposure and perform better with increasing drought than a completely submerged growing species. Here, we conducted a microcosm experiment and exposed two Potamogeton species—the completely submerged growing Potamogeton perfoliatus and the areal leaf producing Potamogeton nodosus—to different drought conditions (1, 5, and 15 days). We aimed to detect how two species with different growth strategies cope with and respond to increasing air exposures with waterlogged sediment. Both species showed a resistance to 1–5 days of drought but showed high mortality after 15 days. They displayed significant differences in all measured morphological responses (shoot length, side shoot, and leaf counts), plant chemistry (carbon, nitrogen, and phosphate), and the produced biomass (shoot, root, leaves), and reacted significantly to increasing drought durations. Differences in their resistance were observed based on the mortality rate and morphological responses. To prevent long-term droughts and keep mortality low, we recommend to the water managers to identify areas of risk and increase water levels during dry periods.

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Response of the invasive alga starry stonewort (Nitellopsis obtusa) to control efforts in a Minnesota lake

Cited by 11 publications

References 44 publications

Chemical management strategies for starry stonewort : a mesocosm study

Chemical management strategies for starry stonewort : a mesocosm study

Aligning research and management priorities for Nitellopsis obtusa (starry stonewort)

The impact of drought duration on two Potamogeton species with different growth forms

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