Problems With the Shoreline Development Index—A Widely Used Metric of Lake Shape

Seekell, David A.; Cael, B. B.; Byström, Pär

doi:10.1029/2022gl098499

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…High SDI values are hypothesized to be conducive to Walleye survival because of a greater potential refuge area (Pratt and Fox 2001). It is important to note that a recent study found that SDI was scale dependent on lakes and could result in potential biases in morphological measurements (e.g., different resolution maps) used for SDI calculations (Seekell et al 2022). Therefore, mixed results between SDI and Walleye recruitment may be difficult to resolve, and further work should address whether lake characteristics are directly related to SDI to help determine whether the effect of SDI on Walleye is context dependent.…”

Section: Discussionmentioning

confidence: 99%

Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan

Bopp,

Herbst,

Brenden

et al. 2023

N American J Fish Manag

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ObjectiveIn recent decades, widespread evidence of declining Walleye Sander vitreus recruitment in the Midwestern United States has raised concerns about diminishing ecological benefits and fishing opportunities, which in turn has resulted in natural resource agencies using stocking to supplement populations. Success of Walleye stocking events vary; thus, evaluating the external factors that influence recruitment success of Walleye resulting from stocking or natural production is critical for improved management.MethodsWe evaluated factors influencing the relative recruitment in 98 lakes stocked annually with Walleye by integrating 20 years of stocking data with fisheries assessment and abiotic data. We indexed recruitment as the relative abundance of Walleye cohorts from natural and stocked sources combined and used boosted regression tree modeling to identify variables that are associated with varying recruitment.ResultGrowing degree‐days at age 1, shoreline development index, mean depth, and degree‐days at age 2 were the most important variables. The boosted regression tree model explained 17% of observed variability in recruitment. A positive relationship between growing degree‐days and Walleye recruitment was observed, whereas shoreline development and lake depth had a negative relationship with recruitment. Secondarily important predictors were lake surface area, spring warming rate, Northern Pike Esox lucius abundance, and degree‐days at age 0. In general, Walleye recruitment was positively associated with these predictors, with the exceptions of spring warming rates >0.3°C/day and being exposed to >3500 degree‐days at age 0.ConclusionOur results indicate that thermal variables in addition to lake characteristics are important recruitment drivers in stocked waters and highlights the potential for resource managers to use this information to prioritize stocking efforts in temperate lakes.

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Section: Discussionmentioning

confidence: 99%

Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan

Bopp,

Herbst,

Brenden

et al. 2023

N American J Fish Manag

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“…Furthermore, our method for calculating wetland fraction is scale-sensitive and yields larger values for smaller lakes. The classic Shoreline Development Index (SDI) has similar scale dependence (Seekell, Cael, and Byström 2022). Thus, small and/or sinuous lakes have higher wetland fractions, regardless of land cover type.…”

Section: Discussionmentioning

confidence: 99%

Geospatial analysis of Alaskan lakes indicates wetland fraction and surface water area are useful predictors of methane ebullition

Savignano

Kyzivat

Smith

et al. 2022

Preprint

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Arctic-Boreal lakes emit methane (CH4), a powerful greenhouse gas. Recent studies suggest ebullition may be a dominant methane emission pathway in lakes but its drivers are poorly understood. Various predictors of lake methane ebullition have been proposed, but are challenging to evaluate owing to different geographical characteristics, field locations, and sample densities. Here we compare large geospatial datasets of lake area, lake perimeter, permafrost, landcover, temperature, soil organic carbon content, depth, and greenness with remotely sensed methane ebullition estimates for 5,143 Alaskan lakes. We find that lake wetland fraction (LWF), a measure of lake wetland and littoral zone area, is a leading predictor of methane ebullition (adj. R² = 0.211), followed by lake surface area (adj. R² = 0.201). LWF is inversely correlated with lake area, thus higher wetland fraction in smaller lakes may explain a commonly cited inverse relationship between lake area and methane ebullition. Lake perimeter (adj. R² = 0.176) and temperature (adj. R² = 0.157) are moderate predictors of lake ebullition, and soil organic carbon content, permafrost, lake depth, and greenness are weak predictors. The low adjusted R² values are typical and informative for methane attribution studies. A multiple regression model combining LWF, area, and temperature performs best (adj. R² = 0.325). Our results suggest landscape-scale geospatial analyses can complement smaller field studies, for attributing Arctic-Boreal lake methane emissions to readily available environmental variables.

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“…The shoreline development index (D L ) was estimated for each reservoir following the bias-corrected equation of Seekell et al [41] to improve comparison among reservoirs with different surface areas at the conservation pool, using an average shoreline fractal dimension value of 1.43 estimated from the regression of the logarithm of shore length by the logarithm of area (14 reservoirs, d = slope × 2). This average d value was similar to the average d value for reservoirs elsewhere (e.g., 1.4) [42].…”

Section: Reservoir Physical Features 251 Morphometry and Stratificationmentioning

confidence: 99%

Watershed Development and Eutrophying Potable Source-Water Reservoirs in a Warming Temperate/Subtropical Region

Burkholder,

Kinder,

Allen

2023

Water

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Reservoirs are increasingly valuable worldwide as potable source waters, yet in many geographic regions, their limnology and trophic status are poorly known. We characterized 14 drinking water reservoirs and their watersheds across the warming temperate/subtropical southeastern USA. Selected reservoirs had at least three years of accessible summer water quality data during 2010–2020, including Secchi depth, nutrients, and algal biomass as chlorophyll a, and depth profiles for temperature and dissolved oxygen. Most watersheds, including lands within a 10-km radius of the reservoirs, had sustained substantial urbanization and/or intensive industrialized animal production, in some cases including the discharge of partially treated human sewage or livestock slaughterhouse wastes near or into the reservoirs. Five reservoirs were assessed as mesotrophic; the others were eutrophic. Most were stratified, but ephemeral near-surface thermoclines were common, and many were too shallow (median depth 5.0 m) to maintain uniform temperatures in the relatively warm hypolimnia. Bottom-water hypoxia/anoxia occurred throughout the summers but, surprisingly, in 8 of 14 reservoirs hypoxia commonly extended to surface waters. In the Southeast as in many regions, drinking water reservoirs are poorly protected and degrading as livestock production and/or urban development increasingly characterize their watersheds. The eutrophication trajectory of these valuable resources should be used as an indicator of ecosystem health and water quality in developing more protective management and policy actions.

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Problems With the Shoreline Development Index—A Widely Used Metric of Lake Shape

Cited by 12 publications

References 26 publications

Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan

Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan

Geospatial analysis of Alaskan lakes indicates wetland fraction and surface water area are useful predictors of methane ebullition

Watershed Development and Eutrophying Potable Source-Water Reservoirs in a Warming Temperate/Subtropical Region

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