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- Author:
- Scott S. Knight, et al. ; Richard E. Lizotte; Lindsey M. W. Yasarer; Ronald L. Bingner; Martin A. Locke; Show all 5 Authors
- Source:
- Water 2021 v.13 no.8 pp. -
- ISSN:
- 2073-4441
- Subject:
- agricultural watersheds; algae; chlorophyll; climate change; conservation areas; conservation buffers; conservation tillage; constructed wetlands; eutrophication; oxbow lakes; sediments; summer; total nitrogen; total phosphorus; water; water quality
- Abstract:
- ... A key principle of agricultural best management practices (BMPs) is to improve water quality by reducing agricultural-sourced nutrients and associated eutrophication. Long-term (1998–2016) lake summer trophic state index (TSI) trends of an agricultural watershed with agricultural best management practices (BMPs) were assessed. Structural BMPs included vegetative buffers, conservation tillage, cons ...
- DOI:
- 10.3390/w13081123
- https://doi.org/10.3390/w13081123
- Author:
- Scott S. Knight, et al. ; Richard E. Lizotte; Peter C. Smiley; Robert B. Gillespie; Show all 4 Authors
- Source:
- Water 2021 v.13 no.12 pp. -
- ISSN:
- 2073-4441
- Subject:
- USDA; agricultural conservation practice; agricultural runoff; aquatic ecosystems; biodiversity; biogeochemistry; climate; eutrophication; fish; habitats; macroinvertebrates; pesticides; poisonous algae; soil erosion; soil quality; wetlands
- Abstract:
- ... Conservation agriculture practices (CAs) have been internationally promoted and used for decades to enhance soil health and mitigate soil loss. An additional benefit of CAs has been mitigation of agricultural runoff impacts on aquatic ecosystems. Countries across the globe have agricultural agencies that provide programs for farmers to implement a variety of CAs. Increasingly there is a need to de ...
- DOI:
- 10.3390/w13121687
- https://doi.org/10.3390/w13121687
- Author:
- Scott S. Knight, et al. ; Jack Killgore; Show all 2 Author
- Source:
- Journal of Agriculture and Biodiversity Research 2014 v.3 no.8 pp. 117-125
- ISSN:
- 2277-0836
- Subject:
- water pollution; limnology; mathematics and statistics; river deltas; rivers; water quality; farming systems; streams; freshwater fish; nonpoint source pollution; fisheries; population ecology; agricultural watersheds; Mississippi
- Abstract:
- ... It often difficult to determine the environmental soundness of rivers and streams particularly those that may have been impaired by farming as might be the case in the Mississippi Delta. Analysis of fish data can be simplified by calculating mathematical indices that provide a simple number that indicates an impaired or healthy stream. This research shows that while the index may provide a sound w ...
- Handle:
- 10113/60066
- Author:
- Scott S. Knight, et al. ; Richard E. Lizotte Jr.; Lindsey M. W. Yasarer; Martin A. Locke; Ronald L. Bingner; Show all 5 Authors
- Source:
- Journal of environmental quality 2017 v.46 no.2 pp. 330-338
- ISSN:
- 0047-2425
- Subject:
- AGNPS model; Conservation Reserve Program; agricultural watersheds; aquatic ecosystems; best management practices; conservation buffers; conservation practices; conservation tillage; monitoring; nitrates; nitrogen content; nutrient content; oxbow lakes; phosphorus; pollution load; rain
- Abstract:
- ... Watershed‐scale management efforts to reduce nutrient loads and improve the conservation of lakes in agricultural watersheds require effective integration of a variety of agricultural conservation best management practices (BMPs). This paper documents watershed‐scale assessments of the influence of multiple integrated BMPs on oxbow lake nutrient concentrations in a 625‐ha watershed of intensive ro ...
- Handle:
- 10113/5661752
- DOI:
- 10.2134/jeq2016.08.0324
- https://doi.org/10.2134/jeq2016.08.0324
- Author:
- Scott S Knight, et al. ; Robert F. Cullum; Show all 2 Author
- Source:
- Journal of Agriculture and Biodiversity Research 2014 v.3 no.1 pp. 1-8
- ISSN:
- 2277-0836
- Subject:
- agricultural runoff; alluvial plains; animal communities; chlorophyll; clay; conservation practices; fish; fisheries; fisheries management; harvesting; lakes; nitrates; nutrient content; nutrients; phosphorus; pollution control; sediments; soil; sport fishing; total solids; water quality; watersheds
- Abstract:
- ... Beasley Lake watershed was subjected to a series of conservation management practices with the goal of reducing sediment and nutrients entering the lake via agricultural runoff. Concurrent with the application of conservation practices, the lake was renovated and restocked to produce a sports fishery. Conservation practices reduced annual mean total solids from 592 mg/L in 1996 to 66.7 mg/L in 201 ...
- Handle:
- 10113/58929
6. Suspended sediment impact on chlorophyll a, nitrogen and phosphorus relationships in Moon Lake, MS
- Author:
- Scott S. Knight, et al. ; Mary E. King; Charles M. Cooper; Show all 3 Authors
- Source:
- The International Journal of Earth & Environmental Sciences 2015 v.1 no.1 pp. 1-9
- Subject:
- agricultural runoff; alluvial plains; chlorophyll; ecosystem services; nitrogen; nitrogen content; nonpoint source pollution; nutrients; oxbow lakes; phosphorus; pollution load; primary productivity; river deltas; sediments; surface water; suspended sediment; turbidity; water quality; Mississippi; Mississippi River
- Abstract:
- ... Moon Lake, MS is a 947 ha. oxbow lake of the Mississippi River Alluvial Plain also known as the Mississippi Delta. Water was sampled from five sites, bi-weekly from 1982 to 1985. Analysis of surface water quality reviled loading of nutrients from nonpoint source pollution associated with agricultural runoff. Significant negatives correlation was found between total phosphorus and chlorophyll a whi ...
- Handle:
- 10113/62055
- Author:
- Scott S. Knight, et al. ; F. Douglas Shields Jr.; Show all 2 Author
- Source:
- International Journal of Ecological Science and Environmental Engineering 2014 v.1 no.3 pp. 73-79
- ISSN:
- 2375-3854
- Subject:
- adults; ecosystem services; fish communities; fisheries; flood control; freshwater fish; habitats; hydraulic structures; lentic systems; ponds; rivers; species diversity; sports; streams; wetlands; Mississippi
- Abstract:
- ... Complex habitats such as sloughs, oxbows, and wetlands provide important ecosystem services for fish communities. While human manipulation of rivers and streams for flood control often reduce this complexity, some construction practices may provide an unexpected benefit. Structures such as borrow pits excavated for levee construction may mimic the functions of other back water features like oxbows ...
- Handle:
- 10113/60067
- Author:
- Scott S. Knight, et al. ; F. Douglas Shields Jr.; Richard E. Lizotte Jr.; Show all 3 Authors
- Source:
- River research and applications 2013 v.29 no.3 pp. 313-329
- ISSN:
- 1535-1467
- Subject:
- agricultural land; agricultural runoff; aquatic habitat; diurnal variation; dry season; ecological restoration; ecosystem services; fish; floodplains; habitat destruction; hydraulic structures; hydrochemistry; hypoxia; intensive farming; nitrogen content; phosphorus; rivers; seasonal variation; spatial variation; species diversity; spring; summer; temperature; total solids; water quality; water supply; wet season; wetlands; winter; Mississippi
- Abstract:
- ... The floodplains of lowland rivers contain diverse aquatic habitats that provide valuable ecosystem services but are perturbed when intensively cultivated. Hydrologic, water chemistry and biological (fish) conditions in five aquatic habitats along the Coldwater River, Mississippi, were measured for more than 4 years: the river, two severed meanders that functioned as backwaters, a managed wetland a ...
- Handle:
- 10113/56966
- DOI:
- 10.1002/rra.1596
- https://doi.org/10.1002/rra.1596
- Author:
- Scott S. Knight, et al. ; Richard E. Lizotte Jr.; F. Douglas Shields Jr.; Justin N. Murdock; Show all 4 Authors
- Source:
- Chemosphere 2012 v.87 no.7 pp. 684-691
- ISSN:
- 0045-6535
- Subject:
- sediments; atrazine; phytoplankton; wetlands; Hyalella azteca; permethrin; land management; nitrogen; agricultural runoff; aquatic invertebrates; rain; floodplains; metolachlor; pigments; toxicity; risk reduction; nutrients; chlorophyll; environmental fate; phosphorus
- Abstract:
- ... We assessed the aqueous toxicity mitigation capacity of a hydrologically managed floodplain wetland following a synthetic runoff event amended with a mixture of sediments, nutrients (nitrogen and phosphorus), and pesticides (atrazine, S-metolachlor, and permethrin) using 48-h Hyalella azteca survival and phytoplankton pigment, chlorophyll a. The runoff event simulated a 1h, 1.27cm rainfall event f ...
- Handle:
- 10113/55169
- DOI:
- 10.1016/j.chemosphere.2011.12.058
- PubMed:
- 22245061
- https://doi.org/10.1016/j.chemosphere.2011.12.058
- Author:
- Scott S. Knight, et al. ; Richard E. Lizotte Jr.; F. Douglas Shields Jr.; Justin N. Murdock; Robert Kröger; Show all 5 Authors
- Source:
- Science of the total environment 2012 v.427-428 no. pp. 373-381
- ISSN:
- 0048-9697
- Subject:
- agricultural runoff; agrochemicals; atrazine; metolachlor; nitrogen; nutrient content; nutrients; phosphorus; rain; risk reduction; rivers; sediments; weirs; wetlands
- Abstract:
- ... We examined the mitigation efficiency of a managed riverine wetland amended with a mixture of suspended sediment, two nutrients (nitrogen and phosphorus), and three pesticides (atrazine, metolachlor, and permethrin) during a simulated agricultural runoff event. Hydrologic management of the 500m-long, 25m-wide riverine wetland was done by adding weirs at both ends. The agrichemical mixture was amen ...
- DOI:
- 10.1016/j.scitotenv.2012.04.025
- PubMed:
- 22560749
- https://doi.org/10.1016/j.scitotenv.2012.04.025
- Author:
- Scott S. Knight, et al. ; F. Douglas Shields Jr; John M. Stofleth; Show all 3 Authors
- Source:
- Aquatic conservation 2008 v.18 no.5 pp. 761-779
- ISSN:
- 1052-7613
- Subject:
- streams; riparian forests; sediments; carbon; organic matter; freshwater fish; benthic organisms; aquatic invertebrates; dead wood; plant litter; habitat conservation; Mississippi
- Abstract:
- ... 1. Allochthonous carbon is the basis of the detrital food web in low‐order, warmwater stream ecosystems, and stream‐bed sediments typically function as carbon reservoirs. Many of the same factors that govern carbon input and storage to streams (e.g. riparian vegetation, large wood, heterogeneous boundaries) have also been identified as key attributes of stream fish habitat. 2. Effects of channel i ...
- Handle:
- 10113/28330
- DOI:
- 10.1002/aqc.868
- https://doi.org/10.1002/aqc.868