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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/wer.1207
|2 doi
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|a pubmed24n1001.xml
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|a (NLM)31424121
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Welch, Eugene B
|e verfasserin
|4 aut
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|a Four decades of diluting phosphorus to maintain lake quality
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 19.12.2019
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|a Date Revised 19.12.2019
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2019 Water Environment Federation.
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|a Dilution with low-nutrient Columbia River Water (CRW) has markedly improved Moses Lake quality for 42 years. There were two phases of CRW volume input, which proportionately lowered total phosphorus (TP). Initially, spring-summer inputs averaged 130 × 106 m3 during 1977-1988 reducing average TP from 152 to 65 µg/L in half the lake proximal to the inputs. That input represented 1.5 volumes of that half-lake volume. Inputs doubled through the mid-1990s, and nearly 2.5 times since 2000, decreasing TP to a 18-year average of 24 µg/L. Chlorophyll a (chl) decreased further from 18 µg/L during the early dilution years to about 6 µg/L as TP declined. Cyanobacteria biovolume declined to 57% of total biovolume during 1977-1988 from 98% before dilution. Less (65%) CRW water since 2016 led to higher TP (41 µg/L) and chl (18 µg/L) in 2018, while cyanobacteria averaged 87% of total biovolume. More TP and cyanobacteria in 2018 are attributed to more internal TP loading. Increased N:P ratios have possibly given more advantage to the non-N-fixing cyanobacteria Microcystis, which comprised 82% and 74% of maximum cyanobacteria biovolume in 2017 and 2018. PRACTITIONER POINTS: Lake total phosphorus (TP) was reduced 57% in the 1970s-1980s by adding large volumes of low-nutrient Columbia River water (CRW). Total P was further reduced by 65% since 2000 by more than doubling the earlier CRW input to an average spring-summer concentration of 24 μg/L. Less (65%) CRW during 2017-2018 led to higher lake TP (41 μg/L) and a worse cyanobacteria bloom in 2018. Microcystis, an non-nitrogen fixer, was the dominant cyanobacteria in 2017-2018 likely related to higher N:P ratios
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|a Case Reports
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|a N:P ratio
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|a dilution
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|a phosphorus
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|a trophic state
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|a Chlorophyll
|2 NLM
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|a 1406-65-1
|2 NLM
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|a Phosphorus
|2 NLM
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|a 27YLU75U4W
|2 NLM
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|a Chlorophyll A
|2 NLM
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|a YF5Q9EJC8Y
|2 NLM
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|a Brattebo, Shannon K
|e verfasserin
|4 aut
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|a Overland, Christopher
|e verfasserin
|4 aut
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|i Enthalten in
|t Water environment research : a research publication of the Water Environment Federation
|d 1998
|g 92(2020), 1 vom: 16. Jan., Seite 26-34
|w (DE-627)NLM098214292
|x 1554-7531
|7 nnns
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|g volume:92
|g year:2020
|g number:1
|g day:16
|g month:01
|g pages:26-34
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|u http://dx.doi.org/10.1002/wer.1207
|3 Volltext
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