Patterns of nitrogen transport in streams of the Lake Tahoe Basin, California‐Nevada

Coats, Robert; Goldman, Charles R.

doi:10.1029/2000wr900219

Cited by 38 publications

(30 citation statements)

References 58 publications

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“…For example, N-rich compounds can originate in soils due to selective preservation of refractory proteins 42,43 and/or production of labile proteins in situ 41,42 and then be transported via runoff and stream flow. Terrestrial DON can sometimes account for up to 90% of the N that enters highelevation lakes 44,45 . However, accumulation of a protein-like fluorescence signal during warmer months has also been attributed to in situ production by lake microorganisms 9,19,46,47 .…”

Section: Discussionmentioning

confidence: 99%

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

et al. 2015

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The role of dissolved organic matter (DOM) as either a sink for inorganic nutrients or an additional nutrient source is an often-neglected component of nutrient budgets in aquatic environments. Here, we examined the role of DOM in reactive nitrogen (N) storage in Sierra Nevada (California, USA) lakes where atmospheric deposition of N has shifted the lakes toward seasonal phosphorus (P)-limitation. Nuclear magnetic resonance (NMR) spectroscopy and isotope analyses performed on DOM isolated from Lake Tahoe reveal the accumulation of refractory proteinaceous material with a 100-200-year residence time. In contrast, smaller lakes in the same watershed contain DOM with typical terrestrial characteristics, indicating that proteins in Lake Tahoe are autochthonously produced. These data support the role of DOM as a possible sink for reactive N in these lake ecosystems and identify a potential role for DOM in affecting the inorganic nutrient stoichiometry of these environments.

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Section: Discussionmentioning

confidence: 99%

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

et al. 2015

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“…This corresponds to roughly the same depth of a deep chlorophyll maximum that develops each summer at a depth of 55-70 m (TERC 2010). This high water transparency results from the relatively small watershed size (812 km 2 ) and low particulate and dissolved matter load in the associated tributaries flowing into the lake (Coats and Goldman 2001;Hatch et al 2001;Reuter et al 2003).…”

Section: Study Sitementioning

confidence: 99%

Quantitative assessment of invasive species in lacustrine environments through benthic imagery analysis

Forrest

Wittmann

Schmidt

et al. 2012

Limnology & Ocean Methods

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The establishment, spread, and impact of the invasive bivalve Corbicula fluminea (C. fluminea), in Lake Tahoe threatens native species distribution in the lake and, potentially, has long-term implications for water clarity. In 2009, UBC-Gavia, an Autonomous Underwater Vehicle (AUV), was used as a platform to collect georeferenced imagery of the benthic regions of Lake Tahoe to determine the lake-wide distribution of C. fluminea. Images were collected in water depths less than 10 m at an approximately constant height above the bottom of 2 m. Images were processed using a semi-automated procedure to determine the ratio of the lakebed covered by exposed C. fluminea shells. A visual review was conducted on a subset of the images to determine presence of filamentous algae that has been observed in association with C. fluminea. Nearly 100 km of shoreline was covered over a 7-d period, and C. fluminea presence was reconfirmed in 4 regions and additional 10 regions identified. In regions where the presence of C. fluminea was confirmed, C. fluminea depth distribution was validated by comparing image detection counts and results from a benthic sediment grab sample survey. Three regions around the lake were identified to have filamentous green algae or charophyte species. It was impossible to identify species of the known filamentous algal taxa (Cladophora glomerata, Spirogyra spp., and Zygnema spp.). The collected imagery provides a synoptic view on species distribution within the lake that can be used for efficient monitoring of invasive species in freshwater and saltwater bodies.

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“…Jassby et al (1994) found that atmospheric deposition supplies most of the N to Lake Tahoe. While runoff from catchment streams supplies organic N to Lake Tahoe (Coats and Goldman 2001), a recent meta-analysis fi nds little relation between DON runoff and atmospheric N deposition (Pellerin et al 2006).…”

Section: Observed Biotic Responses To N Depositionmentioning

confidence: 99%

Assessment of Nitrogen deposition effects and empirical critical loads of Nitrogen for ecoregions of the United States

Pardo¹,

Robin-Abbott²,

Driscoll³

2011

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Human activity in the last century has led to a substantial increase in nitrogen (N) emissions and deposition. This N deposition has reached a level that has caused or is likely to cause alterations to the structure and function of many ecosystems across the United States. One approach for quantifying the level of pollution that would be harmful to ecosystems is the critical loads approach. The critical load is defi ned as the level of a pollutant below which no detrimental ecological effect occurs over the long term according to present knowledge.The objective of this project was to synthesize current research relating atmospheric N deposition to effects on terrestrial and aquatic ecosystems in the United States and to identify empirical critical loads for atmospheric N deposition. The receptors that we evaluated included freshwater diatoms, mycorrhizal fungi and other soil microbes, lichens, herbaceous plants, shrubs, and trees. The main responses reported fell into two categories: (1) biogeochemical, and (2) individual species, population, and community responses.The range of critical loads for nutrient N reported for U.S. ecoregions, inland surface waters, and freshwater wetlands is 1 to 39 kg N ha -1 y -1. This broad range spans the range of N deposition observed over most of the country. The empirical critical loads for N tend to increase in the following sequence for different life forms: diatoms, lichens and bryophytes, mycorrhizal fungi, herbaceous plants and shrubs, trees.The critical loads approach is an ecosystem assessment tool with great potential to simplify complex scientifi c information and effectively communicate with the policy community and the public. This synthesis represents the fi rst comprehensive assessment of empirical critical loads of N for ecoregions across the United States.

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Patterns of nitrogen transport in streams of the Lake Tahoe Basin, California‐Nevada

Cited by 38 publications

References 58 publications

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

Quantitative assessment of invasive species in lacustrine environments through benthic imagery analysis

Assessment of Nitrogen deposition effects and empirical critical loads of Nitrogen for ecoregions of the United States

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