Development and Application of a Lotic Ecosystem Trophic Status Index

Matlock, Marty D.; Storm, Daniel E.; Smolen, Michael D.; Matlock, Marty; McFarland, Anne; Hauck, Larry M.

doi:10.13031/2013.13226

Cited by 16 publications

(34 citation statements)

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“…First, studies had to present results of in situ nutrient‐enrichment experiments in running waters (streams and rivers). We included studies that used nutrient‐diffusing substrates (NDS; Fairchild & Lowe, 1984), flow‐through systems (FTS; Grimm & Fisher, 1986) or periphytometers (Matlock et al. , 1999).…”

Section: Methodsmentioning

confidence: 99%

Can we predict nutrient limitation in streams and rivers?

Keck

Lepori

2012

Freshwater Biology

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Summary 1. Anthropogenic impacts on the biogeochemical cycles of nitrogen (N) and phosphorus (P) affect natural ecosystems worldwide. Modelling is required to predict where and when these key nutrients limit primary production in freshwaters. 2. We reviewed 382 nutrient‐enrichment experiments to examine which factors promote limitation of microphytobenthos biomass by N or P in streams and rivers. Using regression models, we examined whether the response of microphytobenthos biomass to N and P additions could be predicted by the absolute N and P concentrations in the water, the water N:P ratio or a combination of the two. 3. The absolute N concentration in the water was the best predictor of the magnitude of the response of microphytobenthos biomass to N additions. In comparison, the N:P ratio was the best predictor of whether or not N was limiting. However, predictions were uncertain except at extreme N:P ratios <1 : 1 and >100 : 1. 4. The absolute P concentration in the water was the best predictor of the magnitude of the response of microphytobenthos biomass to P additions. Neither the absolute nor the relative N and P concentrations predicted whether or not P was limiting. 5. The absolute and the relative N and P water concentrations contribute significant and complementary insights into the responses of microphytobenthos biomass to nutrient enrichment in running waters. However, ability to predict nutrient limitation from these concentrations is constrained by substantial error in the models. In the future, the prediction ability of models of nutrient limitation might be improved by focussing on regional scales and accounting for additional factors such as light and disturbance.

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Section: Methodsmentioning

confidence: 99%

Can we predict nutrient limitation in streams and rivers?

Keck

Lepori

2012

Freshwater Biology

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“…A possible explanation for this is that as catchment area increases, stream width increases, providing more insolation. Algal growth in the War Eagle Creek watershed and other tributaries to Beaver Reservoir has been characterized as P limited (White et al, 2005;Ludwig, 2006), and maximum potential productivity (Matlock et al, 1999) has been correlated to photosynthetic available radiation (PAR) across the Beaver Reservoir watershed (Ludwig, 2006).…”

Section: Results and Discussion Statistical Evaluations Between Sitesmentioning

confidence: 99%

Linking Watershed Subbasin Characteristics to Water Quality Parameters in War Eagle Creek Watershed

Migliaccio¹,

Haggard²,

Chaubey³

et al. 2007

Transactions of the ASABE

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“…The LETSI was established by Matlock et al. (1999) as an index of algal growth potential for streams.…”

Section: Methodsmentioning

confidence: 99%

“…, 1992). A lotic ecosystem trophic status index (LETSI) was developed from nutrient‐enrichment studies in Texas, as a metric to describe the trophic state of streams (Matlock et al. , 1999).…”

Section: Introductionmentioning

confidence: 99%

Periphyton Nutrient Limitation and Maximum Potential Productivity in the Beaver Lake Basin, United States¹

Ludwig

Matlock

Haggard

et al. 2012

J American Water Resour Assoc

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Ludwig, Andrea, Marty Matlock, Brian Haggard, and Indrajeet Chaubey, 2012. Periphyton Nutrient Limitation and Maximum Potential Productivity in the Beaver Lake Basin, United States. Journal of the American Water Resources Association (JAWRA) 48(5): 896‐908. DOI: 10.1111/j.1752‐1688.2012.00657.x Abstract: The objectives of this study were to measure periphytic growth responses to enrichment with nitrogen (N), phosphorus (P), and simultaneous N and P using in situ bioassays in streams draining Beaver Reservoir Basin, Northwest Arkansas; compare periphytic growth responses measured with in situ bioassays with a range of land use and point sources; and test the lotic ecosystem trophic status index (LETSI) as a simplifying metric to compare effects of nonpoint‐source pollutant‐limiting variables of N, P, and sediment across the basin. P limitation was observed at sites across a transect of stream orders throughout the basin; however, at the two sites with highest ambient nitrogen concentrations, limitation was often coupled with nitrogen limitation. Nutrients were at nonlimiting levels at both of two sites below wastewater treatment plants in all seasonal deployments. A Michaelis‐Menten growth equation described LETSI as a function of ambient PO4‐P concentrations (p < 0.05); the midpoint (LETSI of 0.50) corresponded with a PO4‐P concentration of approximately 3 μg/l. Change‐point analysis indicated a threshold point at LETSI of 0.80 and 15 μg/l PO4‐P. These low values show that the periphytic community has a high affinity for available P, and that the watershed as a whole is sensitive to available nutrient inputs.

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Development and Application of a Lotic Ecosystem Trophic Status Index

Cited by 16 publications

References 0 publications

Can we predict nutrient limitation in streams and rivers?

Can we predict nutrient limitation in streams and rivers?

Linking Watershed Subbasin Characteristics to Water Quality Parameters in War Eagle Creek Watershed

Periphyton Nutrient Limitation and Maximum Potential Productivity in the Beaver Lake Basin, United States¹

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Development and Application of a Lotic Ecosystem Trophic Status Index

Cited by 16 publications

References 0 publications

Can we predict nutrient limitation in streams and rivers?

Can we predict nutrient limitation in streams and rivers?

Linking Watershed Subbasin Characteristics to Water Quality Parameters in War Eagle Creek Watershed

Periphyton Nutrient Limitation and Maximum Potential Productivity in the Beaver Lake Basin, United States1

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Periphyton Nutrient Limitation and Maximum Potential Productivity in the Beaver Lake Basin, United States¹