Assessment of nutrient enrichment by use of algal-, invertebrate-, and fish-community attributes in wadeable streams in ecoregions surrounding the Great Lakes

Frey, Jeffrey W.; Bell, Amanda H.; Berkman, Julie A. Hambrook; Lorenz, David L.

doi:10.3133/sir20115009

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…Using simulated data and monitoring data from the U.S. Geological Survey's (USGS) National Water Quality Assessment program (NAWQA) study of wadeable streams, 4 we show that pooling data from multiple sites using a Bayesian hierarchical modeling approach will reduce estimation uncertainty, particularly for waters with small sample sizes. We start with an introduction to shrinkage estimators in the context of estimating mean nutrient concentrations for CWA compliance assessment, followed by detailed examples illustrating the implications of a shrinkage estimator.…”

Section: ■ Introductionmentioning

confidence: 99%

Implications of Stein’s Paradox for Environmental Standard Compliance Assessment

Qian

Stow

Cha

2015

Environ. Sci. Technol.

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The implications of Stein's paradox stirred considerable debate in statistical circles when the concept was first introduced in the 1950s. The paradox arises when we are interested in estimating the means of several variables simultaneously. In this situation, the best estimator for an individual mean, the sample average, is no longer the best. Rather, a shrinkage estimator, which shrinks individual sample averages toward the overall average is shown to have improved overall accuracy. Although controversial at the time, the concept of shrinking toward overall average is now widely accepted as a good practice for improving statistical stability and reducing error, not only in simple estimation problems, but also in complicated modeling problems. However, the utility of Stein's insights are not widely recognized in the environmental management community, where mean pollutant concentrations of multiple waters are routinely estimated for management decision-making. In this essay, we introduce Stein's paradox and its modern generalization, the Bayesian hierarchical model, in the context of environmental standard compliance assessment. Using simulated data and nutrient monitoring data from wadeable streams around the Great Lakes, we show that a Bayesian hierarchical model can improve overall estimation accuracy, thereby improving our confidence in the assessment results, especially for standard compliance assessment of waters with small sample sizes.

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Section: ■ Introductionmentioning

confidence: 99%

Implications of Stein’s Paradox for Environmental Standard Compliance Assessment

Qian

Stow

Cha

2015

Environ. Sci. Technol.

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“…Interestingly, this paradigm, however, is continuously shifting due to monsoon rainfall in Asian lentic water bodies [2,22]. Whatever the case, higher loadings of nutrients and organic matter may have a serious effect on Chl-a production as well as the biotic communities [23][24]. Therefore, nutrient contributing factors (N, P) and organic matter loads are decisively involved in concocting reservoir water quality.…”

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confidence: 99%

Reservoir Water Quality Assessment Based on Chemical Parameters and the Chlorophyll Dynamics in Relation to Nutrient Regime

Atique

2019

Pol. J. Environ. Stud.

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During the past few decades, freshwater resources are subjugated to increasing anthropogenic activities such as the construction of reservoirs for accruing the benefits of power generation, municipal water supply for drinking and household, transportation, flood control, recreation, agriculture, fishing [1], aesthetics, raising aquatic animals, and so on. Due to natural flow manipulations coupled with intensive rainfall [2], degradation of physiochemical water quality is very recognizable [3], besides trophic disarrays such as oligotrophy due to higher water retention time and

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“…The major sources of nutrients may be related with watershed characteristics (Jordan et al 1997), land-use patterns of intensive agricultural activities and population-dense urban (Arheimer & Liden 2000), and point sources of industrial complex and wastewater disposal plants (WDPs, Wang et al 2001). High-nutrient loadings and organic matter inputs may decrease the proportions of sensitive species (SS) and increase tolerant species (TS) (Frey et al 2011). Also, nutrient enrichments and habitat degradations may increase the proportion of trophic guilds such as omnivore species (OS) and decrease the relative abundance of insectivores (An et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Modifications of ecological trophic structures on chemical gradients in lotic ecosystems and their relations to stream ecosystem health

Ji-Woong

Lee

2013

Animal Cells and Systems

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The objectives of this study were to evaluate how chemical gradients and physical habitats influence trophic dynamics and chemical tolerance in relation to ecological health, based on biological integrity model in the absence of cascading pressures (cascading theory) as a control mechanism of aquatic ecosystems. We conducted physical, chemical, and biological surveys from 76 national streams and rivers of four major watersheds during 2004Á2005 along with surveys of 80 reference streams. Maximum species richness lines (MSRLs) in reference sites vs. regular sampling sites indicated that the third-to fifth-order streams were evidently impaired in the metrics of trophic and tolerant components. These trophic modifications were linked with land-use patterns, which resulted in differences of nutrients (N, P), organic matter contents and the N:P ratios on trophic structures. Overall, these trophic factors influenced ecological health, based on multimetric index of biological integrity model in these systems, so that trophic compositions and tolerance were regulated by bottom-up hypothesis.

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Assessment of nutrient enrichment by use of algal-, invertebrate-, and fish-community attributes in wadeable streams in ecoregions surrounding the Great Lakes

Cited by 10 publications

References 23 publications

Implications of Stein’s Paradox for Environmental Standard Compliance Assessment

Implications of Stein’s Paradox for Environmental Standard Compliance Assessment

Reservoir Water Quality Assessment Based on Chemical Parameters and the Chlorophyll Dynamics in Relation to Nutrient Regime

Modifications of ecological trophic structures on chemical gradients in lotic ecosystems and their relations to stream ecosystem health

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