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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.12759
|2 doi
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|a pubmed24n0808.xml
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|a (DE-627)NLM242582257
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|a (NLM)25294238
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Lewis, Tyler L
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Pronounced chemical response of Subarctic lakes to climate-driven losses in surface area
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|c 2015
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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 28.10.2015
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|a Date Revised 18.02.2015
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2014 John Wiley & Sons Ltd.
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|a Losses in lake area have been observed for several Arctic and Subarctic regions in recent decades, with unknown consequences for lake ecosystems. These reductions are primarily attributed to two climate-sensitive mechanisms, both of which may also cause changes in water chemistry: (i) increased imbalance of evaporation relative to inflow, whereby increased evaporation and decreased inflow act to concentrate solutes into smaller volumes; and (ii) accelerated permafrost degradation, which enhances sublacustrine drainage while simultaneously leaching previously frozen solutes into lakes. We documented changes in nutrients [total nitrogen (TN), total phosphorus (TP)] and ions (calcium, chloride, magnesium, sodium) over a 25 year interval in shrinking, stable, and expanding Subarctic lakes of the Yukon Flats, Alaska. Concentrations of all six solutes increased in shrinking lakes from 1985-1989 to 2010-2012, while simultaneously undergoing little change in stable or expanding lakes. This created a present-day pattern, much weaker or absent in the 1980s, in which shrinking lakes had higher solute concentrations than their stable or expanding counterparts. An imbalanced evaporation-to-inflow ratio (E/I) was the most likely mechanism behind such changes; all four ions, which behave semiconservatively and are prone to evapoconcentration, increased in shrinking lakes and, along with TN and TP, were positively related to isotopically derived E/I estimates. Moreover, the most conservative ion, chloride, increased >500% in shrinking lakes. Conversely, only TP concentration was related to probability of permafrost presence, being highest at intermediate probabilities. Overall, the substantial increases of nutrients (TN >200%, TP >100%) and ions (>100%) may shift shrinking lakes towards overly eutrophic or saline states, with potentially severe consequences for ecosystems of northern lakes
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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4 |
|a Research Support, U.S. Gov't, Non-P.H.S.
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| 650 |
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4 |
|a aquatic nutrients
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| 650 |
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4 |
|a eutrophication
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4 |
|a evapoconcentration
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|a permafrost
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| 650 |
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4 |
|a shrinking lakes
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| 650 |
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|a subarctic
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| 650 |
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4 |
|a water chemistry
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| 650 |
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|a Phosphorus
|2 NLM
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| 650 |
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|a 27YLU75U4W
|2 NLM
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| 650 |
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 700 |
1 |
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|a Lindberg, Mark S
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Schmutz, Joel A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Heglund, Patricia J
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Rover, Jennifer
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Koch, Joshua C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bertram, Mark R
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 21(2015), 3 vom: 18. März, Seite 1140-52
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:21
|g year:2015
|g number:3
|g day:18
|g month:03
|g pages:1140-52
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| 856 |
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|u http://dx.doi.org/10.1111/gcb.12759
|3 Volltext
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|h 1140-52
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