Short-term declines in curlyleaf pondweed in Minnesota: potential influences of snowfall

Valley, Ray D.; Heiskary, Steve

doi:10.1080/07438141.2012.745911

Cited by 12 publications

(24 citation statements)

References 15 publications

(25 reference statements)

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“…). Cover of invasive curvyleaf pondweed ( Potamogeton crispus ), which was also strongly correlated with temperature in my study, declined due to thicker snow depth on frozen lakes of Minnesota, as less light was available for plants below the ice (Valley & Heiskary ). Mild winters seem to at least benefit species with opportunistic reproductive strategies, being often invasive, and plants that favour nutrient‐rich waters.…”

Section: Discussionsupporting

confidence: 55%

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Geographic patterns of lake macrophyte communities and species richness at regional scale

Alahuhta

2014

J Vegetation Science

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Questions Are community composition and species richness of aquatic macrophytes determined primarily by local (habitat heterogeneity and water quality) or regional (climate) patterns at regional scale? Do two macrophyte functional groups (i.e. emergent and submerged macrophytes) respond similarly to local and regional patterns? Are lake macrophytes and explanatory variables geographically structured? Location The US state of Minnesota. Methods The community composition and species richness of aquatic flora was studied using presence–absence data in 454 lakes, covering the entire US state of Minnesota. In addition, community composition and species richness of emergent and submerged macrophytes was investigated separately. Variation partitioning based on partial redundancy analysis and partial linear regression was used to study the relative roles of water quality, habitat heterogeneity, climate and sampling effort in explaining community composition and species richness of lake macrophytes, respectively. Results Macrophyte community composition and species richness (all taxa and two functional groups) were explained by water quality and climate. Alkalinity and total phosphorus were water quality variables that most affected community composition of aquatic flora, and macrophyte species richness decreased with increasing concentrations of these two variables. Maximum temperature of the warmest month and mean annual temperature most affected plant community composition, whereas species richness had a negative relationship with minimum temperature of the coldest month. Most significant explanatory variables (e.g. alkalinity, total phosphorus and temperature) were geographically structured, showing a latitudinal change. Conclusions Community composition and species richness of macrophytes were congruently influenced by regional (climate) and local patterns (water quality) at regional scale. Community composition and species richness of helophytes and submerged macrophytes were equally explained by environmental gradients. The latitudinal change in these most significant environmental variables was related to calcareous soils and intensive agriculture, which were situated in the southern part of the state. Macrophyte species richness showed a reverse latitudinal gradient, which was likely due to high nutrient concentrations in southern latitude lakes. Water quality primarily filters species from the regional species pool, allowing only species tolerating high nutrient concentrations, e.g. invasive plants, to survive at southern latitudes.

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Section: Discussionsupporting

confidence: 55%

“…2011b). In addition, harsh winters affect both emergent and submerged macrophytes through freezing of ice sediments and ice erosion, however, restricted access to the atmosphere through ice cover and decreased light availability in snowy winters only control the submerged flora (Tobienssen & Snow ; Valley & Heiskary ).…”

Section: Introductionmentioning

confidence: 99%

Geographic patterns of lake macrophyte communities and species richness at regional scale

Alahuhta

2014

J Vegetation Science

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“…Much of this between-year variation was likely attributable to regional climatic differences that enhanced May curlyleaf growth in 2006 and 2007 and delayed curlyleaf growth in 2008 and 2009. Other studies have suggested that early season curlyleaf growth can be affected greatly by the availability of light during the winter (a function of snowfall and duration of ice cover) and spring water temperatures (Kunii 1982, Tobiessen and Snow 1984, Valley and Heiskary 2012. These weather-related conditions likely affected curlyleaf growth similarly in both our treated and reference lakes (similar geographic locations), but due to the asynchrony of the initial treatments among treated lakes we were not able to discern weather effects from herbicide effects within individual treatment years.…”

Section: Curlyleaf Frequencymentioning

confidence: 69%

Evaluation of lakewide, early season herbicide treatments for controlling invasive curlyleaf pondweed (Potamogeton crispus) in Minnesota lakes

Johnson

Jones

Newman

2012

Lake and Reservoir Management

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“…Curlyleaf pondweed is one of the most widespread and problematic aquatic invasive plants in North America and is a nuisance invader in much of the world (Bolduan, Van Eeckhout, Quade, & Gannon, ). In Minnesota, CLP has been present for over a century and has been found in >730 lakes (Valley & Heiskary, ), where concerns about displacement of native species (Bolduan et al, ), impacts on water quality (James, Dechamps, Turyk, & McGinley, ), and recreational interference (Valley & Heiskary, ) have resulted in extensive control efforts in many lakes.…”

Section: Introductionmentioning

confidence: 99%

“…Curlyleaf pondweed behaves as a winter annual in Minnesota (Johnson, Jones, & Newman, ; Valley & Heiskary, ), sprouting from asexual reproductive structures called turions in the autumn when water temperatures drop below 20°C (Bolduan et al, ; Sastroutomo, ; Tobiessen & Snow, ). In the spring, when water temperatures reach 11°C, overwintered CLP plants begin to grow rapidly before most native macrophyte species are active (Woolf & Madsen, ).…”

Section: Introductionmentioning

confidence: 99%

Constraining invader dominance: Effects of repeated herbicidal management and environmental factors on curlyleaf pondweed dynamics in 50 Minnesota lakes

2020

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Curlyleaf pondweed (Potamogeton crispus) is one of the most widespread and widely managed aquatic invasive plants in North America. Despite decades of management, the efficacy of long‐term management strategies and the effects of environmental drivers on curlyleaf pondweed populations remain uncertain. To evaluate the effects of management and environmental factors on within‐lake distribution and local density of curlyleaf pondweed, we collated monitoring data from point–intercept surveys collected by a variety of lake managers across Minnesota, U.S.A. Using this dataset, comprising 177 lake‐years of plant data, we examined the influence of herbicide treatment, water clarity, snow depth, and ice cover duration on curlyleaf pondweed distribution and density between 2006 and 2015. We evaluated the effects of herbicides on curlyleaf pondweed at three time points relative to treatment: within year, carryover effects the following year, and cumulative effects over multiple years of treatment. All three temporal measures were associated with significant reductions of curlyleaf pondweed. Additionally, herbicidal management reduced both the density and distribution of curlyleaf pondweed. Given that herbicide management led to reductions that carried over into future years, managers may be able to design multi‐year treatments to reduce total management effort over time. We also found strong effects of environmental conditions on curlyleaf pondweed. Elevated lake productivity and decreased winter snow cover were associated with increased springtime distributions of curlyleaf pondweed, whereas duration of winter ice cover had no influence. The influence of productivity suggests that reductions of this invasive species may be an ancillary benefit of water‐quality improvements that lower lakes’ trophic status. Our results also show that decreased winter snow cover, as predicted under climate change, could exacerbate problematic growth of curlyleaf pondweed. Harnessing monitoring data from multiple projects, as this study does, allows for robust inference about environmental and management constraints on macrophytes. Because of environmental and management variability, we suggest that treatment regimens follow an adaptive management cycle, with outcomes of management monitored and evaluated, and strategies updated accordingly. It is also vital to continue monitoring both managed and unmanaged lakes to enable stronger inferences about treatment effectiveness.

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Short-term declines in curlyleaf pondweed in Minnesota: potential influences of snowfall

Cited by 12 publications

References 15 publications

Geographic patterns of lake macrophyte communities and species richness at regional scale

Geographic patterns of lake macrophyte communities and species richness at regional scale

Evaluation of lakewide, early season herbicide treatments for controlling invasive curlyleaf pondweed (Potamogeton crispus) in Minnesota lakes

Constraining invader dominance: Effects of repeated herbicidal management and environmental factors on curlyleaf pondweed dynamics in 50 Minnesota lakes

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