Trophic Transition in a Lake on the Virginia Coastal Plain

Pensa, Mellisa A.; Chambers, Randolph M.

doi:10.2134/jeq2004.5760

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…depth 4.75 m) and water residence time of 75 d (Pensa & Chambers 2004). The lake was established by English colonists in 1718 through damming of the original creek system to form a mill-pond, making it the oldest manmade lake in Virginia and one of the oldest in the New World.…”

Section: Sampling Sitesmentioning

confidence: 99%

Metagenomic assessment of viral diversity in Lake Matoaka, a temperate, eutrophic freshwater lake in southeastern Virginia, USA

Green¹,

Rahman²,

Saxton³

et al. 2015

Aquat. Microb. Ecol.

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Little is known about the composition and diversity of temperate freshwater viral communities. This study presents a metagenomic analysis of viral community composition, taxonomic and functional diversity of temperate, eutrophic Lake Matoaka in southeastern Virginia (USA). Three sampling sites were chosen to represent differences in anthropogenic impacts: the Crim Dell Creek mouth (impacted), the Pogonia Creek mouth (less impacted) and the main body of the lake (mixed). Sequences belonging to tailed bacteriophages were the most abundant at all 3 sites, with Podoviridae predominating. The main lake body harbored the highest virus genotype richness and included cyanophage and eukaryotic algal virus sequences not found at the other 2 sites, while the impacted Crim Dell Creek mouth showed the lowest richness. Cross-contig comparisons indicated that similar virus genotypes were found at all 3 sites, but at different rankabundances. Hierarchical cluster analysis of multiple viral metagenomes indicated high genetic similarity between viral communities of related environments, with freshwater, marine, hypersaline, and eukaryote-associated environments forming into clear groups despite large geographic distances between sampling locations within each environment type. These results support the conclusion that freshwater viral communities are genetically distinct from virus assemblages in other environments.KEY WORDS: Virus · Freshwater · Lake · Temperate · Metagenome · Sequencing · Virome Resale or republication not permitted without written consent of the publisher

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Section: Sampling Sitesmentioning

confidence: 99%

Metagenomic assessment of viral diversity in Lake Matoaka, a temperate, eutrophic freshwater lake in southeastern Virginia, USA

Green¹,

Rahman²,

Saxton³

et al. 2015

Aquat. Microb. Ecol.

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“…Colman and Bratton (2003) observed that the increase in BSi concentration in Chesapeake Bay sediments were associated with human impacts in the surrounding watershed. Thus, BSi accumulation in sediment is often used as a proxy for nutrient loading and algal production in aquatic systems (Pensa & Chambers, 2004).…”

Section: Biogenic Silicamentioning

confidence: 99%

Depthwise variation of carbon, nitrogen and biogenic silica in sediment from lakes of Pokhara Valley, Nepal

Khadka

Ramanathan

2013

Nep J Environ Sci

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Phewa and Begnas lakes in Pokhara Valley are playing important roles in ecological, economic, cultural and aesthetic aspects. However, due to increase in anthropogenic pressure and activities in the lake catchment, the nutrient load in the lakes has been substantially increased. The growth of algae and phytoplankton is largely dictated by carbon (C), nitrogen (N), phosphorus (P), and silica (Si) availability. Moreover, the increase in P and N loading leads to greater diatom production resulting in the accumulation of biogenic silica (BSi) in sediments. Thus, variation in C, N and BSi in sediment reflects the nutrient dynamics in the lake. In this connection, C, N and Si concentration serves as an indicator for growth of algae, including diatom, phytoplankton productivity, and overall phytoplankton efficiency. The preceding researches have mostly explained limnological characteristics and plankton diversity studies. Hence, information about sediment characteristics associated with nutrient loading and eutrophication seems yet to be wanting. The present study has been carried out to evaluate vertical variation of C, N and BSi in core sediments of the Phewa and Begnas lakes. The C and N was determined by CHNS analyzer and BSi was extracted by wet-alkaline digestion method and determined by molybdosilicate method. The result revealed increase in C, N and BSi contents toward the surface sediments compared to underlying layers suggesting increased rate of accumulation in recent deposits. The magnitude of C, N and BSi was higher in city-ward core of Phewa Lake explaining the influence of the urban inputs ...

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Nutrient loss with runoff from fairway turf: An evaluation of core cultivation practices and their environmental impact

Rice

Horgan

2011

Environmental Toxicology and Chemistry

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The presence of excess nutrients in surface waters can result in undesirable environmental and economic consequences, including nuisance algal blooms and eutrophication. Fertilizer use in highly managed turf systems has raised questions concerning the contribution of nutrients to surrounding surface waters. Experiments were designed to quantify phosphorus and nitrogen transport with runoff from turf plots maintained as a golf course fairway to identify which cultural practice, solid tine (ST) or hollow tine (HT) core cultivation, maximized phosphorus and nitrogen retention at the site of fertilizer application. Simulated precipitation and collection of resulting runoff were completed 26 ± 13 h following granular fertilizer application (18-3-18: N-P₂O₅-K₂O) and 63 d and 2 d following core cultivation. Runoff volumes were reduced in fairway turf plots aerated with HT relative to ST (63 d: 10%, 2 d: 55% reduction). Analysis of the runoff revealed a reduction in soluble phosphorus, ammonium nitrogen, and nitrate nitrogen losses with runoff from plots managed with HT; a 5 to 27% reduction after 63 d; and a 39 to 77% reduction at 2 d. Golf course runoff-to-surface water scenarios were used to calculate estimated environmental concentrations (EECs) of nitrogen and phosphorus in surface water receiving runoff from turf managed with ST or HT core cultivation. Surface water concentrations of phosphorus remained above the U.S. Environmental Protection Agency's water quality criteria to limit eutrophication, with the exception of concentrations associated with HT core cultivation at 2 d. Regardless of management practice (ST or HT) and time between core cultivation and runoff (63 d or 2 d), all EECs of nitrogen were below levels associated with increased algal growth. Understanding nutrient transport with runoff and identifying strategies that reduce off-site transport will increase their effectiveness at intended sites of application and minimize undesirable effects to surrounding surface water resources.

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Trophic Transition in a Lake on the Virginia Coastal Plain

Cited by 5 publications

References 27 publications

Metagenomic assessment of viral diversity in Lake Matoaka, a temperate, eutrophic freshwater lake in southeastern Virginia, USA

Metagenomic assessment of viral diversity in Lake Matoaka, a temperate, eutrophic freshwater lake in southeastern Virginia, USA

Depthwise variation of carbon, nitrogen and biogenic silica in sediment from lakes of Pokhara Valley, Nepal

Nutrient loss with runoff from fairway turf: An evaluation of core cultivation practices and their environmental impact

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