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Nitrogen Deposition Effects on Diatom Communities in Lakes from Three National Parks in Washington State

Overview of attention for article published in Water, Air & Soil Pollution, February 2014
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Title
Nitrogen Deposition Effects on Diatom Communities in Lakes from Three National Parks in Washington State
Published in
Water, Air & Soil Pollution, February 2014
DOI 10.1007/s11270-013-1857-x
Pubmed ID
Authors

Richard W. Sheibley, Mihaela Enache, Peter W. Swarzenski, Patrick W. Moran, James R. Foreman

Abstract

The goal of this study was to document if lakes in National Parks in Washington have exceeded critical levels of nitrogen (N) deposition, as observed in other Western States. We measured atmospheric N deposition, lake water quality, and sediment diatoms at our study lakes. Water chemistry showed that our study lakes were ultra-oligotrophic with ammonia and nitrate concentrations often at or below detection limits with low specific conductance (<100 μS/cm), and acid neutralizing capacities (<400 μeq/L). Rates of summer bulk inorganic N deposition at all our sites ranged from 0.6 to 2.4 kg N ha(-1) year(-1) and were variable both within and across the parks. Diatom assemblages in a single sediment core from Hoh Lake (Olympic National Park) displayed a shift to increased relative abundances of Asterionella formosa and Fragilaria tenera beginning in the 1969-1975 timeframe, whereas these species were not found at the remaining (nine) sites. These diatom species are known to be indicative of N enrichment and were used to determine an empirical critical load of N deposition, or threshold level, where changes in diatom communities were observed at Hoh Lake. However, N deposition at the remaining nine lakes does not seem to exceed a critical load at this time. At Milk Lake, also in Olympic National Park, there was some evidence that climate change might be altering diatom communities, but more research is needed to confirm this. We used modeled precipitation for Hoh Lake and annual inorganic N concentrations from a nearby National Atmospheric Deposition Program station, to calculate elevation-corrected N deposition for 1980-2009 at Hoh Lake. An exponential fit to this data was hindcasted to the 1969-1975 time period, and we estimate a critical load of 1.0 to 1.2 kg N ha(-1) year(-1) for wet deposition for this lake.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 34 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Spain 1 3%
United States 1 3%
Colombia 1 3%
Unknown 31 91%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 12 35%
Student > Master 8 24%
Researcher 6 18%
Student > Doctoral Student 4 12%
Student > Bachelor 2 6%
Other 2 6%
Readers by discipline Count As %
Environmental Science 14 41%
Earth and Planetary Sciences 7 21%
Agricultural and Biological Sciences 5 15%
Unspecified 2 6%
Psychology 1 3%
Other 5 15%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 15 February 2014.
All research outputs
#9,855,089
of 12,337,382 outputs
Outputs from Water, Air & Soil Pollution
#709
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Outputs of similar age
#130,812
of 193,420 outputs
Outputs of similar age from Water, Air & Soil Pollution
#9
of 13 outputs
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