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Global change-driven effects on dissolved organic matter composition : Implications for food webs of northern lakes

Creed, Irena F.; Bergström, Ann Kristin; Trick, Charles G.; Grimm, Nancy B.; Hessen, Dag O.; Karlsson, Jan; Kidd, Karen A.; Kritzberg, Emma LU ; Mcknight, Diane M. and Freeman, Erika C., et al. (2018) In Global Change Biology 24(8). p.3692-3714
Abstract

Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM)-the messenger between terrestrial and lake ecosystems-with potentially profound effects on the structure and function of lakes. Northern terrestrial ecosystems contain substantial stores of organic matter and filter or funnel DOM, affecting the timing and magnitude of DOM delivery to... (More)

Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM)-the messenger between terrestrial and lake ecosystems-with potentially profound effects on the structure and function of lakes. Northern terrestrial ecosystems contain substantial stores of organic matter and filter or funnel DOM, affecting the timing and magnitude of DOM delivery to surface waters. This terrestrial DOM is processed in streams, rivers, and lakes, ultimately shifting its composition, stoichiometry, and bioavailability. Here, we explore the potential consequences of these global change-driven effects for lake food webs at northern latitudes. Notably, we provide evidence that increased allochthonous DOM supply to lakes is overwhelming increased autochthonous DOM supply that potentially results from earlier ice-out and a longer growing season. Furthermore, we assess the potential implications of this shift for the nutritional quality of autotrophs in terms of their stoichiometry, fatty acid composition, toxin production, and methylmercury concentration, and therefore, contaminant transfer through the food web. We conclude that global change in northern regions leads not only to reduced primary productivity but also to nutritionally poorer lake food webs, with discernible consequences for the trophic web to fish and humans.

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publication status
published
subject
keywords
Atmospheric change, Cyanobacteria, Dissolved organic matter, Food webs, Lake, Mercury, Northern
in
Global Change Biology
volume
24
issue
8
pages
3692 - 3714
publisher
Wiley-Blackwell
external identifiers
  • scopus:85045844439
ISSN
1354-1013
DOI
10.1111/gcb.14129
language
English
LU publication?
yes
id
576be848-1512-4458-b14a-46ca58fc1b0e
date added to LUP
2018-05-07 07:58:32
date last changed
2019-02-03 05:32:25
@article{576be848-1512-4458-b14a-46ca58fc1b0e,
  abstract     = {<p>Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM)-the messenger between terrestrial and lake ecosystems-with potentially profound effects on the structure and function of lakes. Northern terrestrial ecosystems contain substantial stores of organic matter and filter or funnel DOM, affecting the timing and magnitude of DOM delivery to surface waters. This terrestrial DOM is processed in streams, rivers, and lakes, ultimately shifting its composition, stoichiometry, and bioavailability. Here, we explore the potential consequences of these global change-driven effects for lake food webs at northern latitudes. Notably, we provide evidence that increased allochthonous DOM supply to lakes is overwhelming increased autochthonous DOM supply that potentially results from earlier ice-out and a longer growing season. Furthermore, we assess the potential implications of this shift for the nutritional quality of autotrophs in terms of their stoichiometry, fatty acid composition, toxin production, and methylmercury concentration, and therefore, contaminant transfer through the food web. We conclude that global change in northern regions leads not only to reduced primary productivity but also to nutritionally poorer lake food webs, with discernible consequences for the trophic web to fish and humans.</p>},
  author       = {Creed, Irena F. and Bergström, Ann Kristin and Trick, Charles G. and Grimm, Nancy B. and Hessen, Dag O. and Karlsson, Jan and Kidd, Karen A. and Kritzberg, Emma and Mcknight, Diane M. and Freeman, Erika C. and Senar, Oscar E. and Andersson, Agneta and Ask, Jenny and Berggren, Martin and Cherif, Mehdi and Giesler, Reiner and Hotchkiss, Erin R. and Kortelainen, Pirkko and Palta, Monica M. and Vrede, Tobias and Weyhenmeyer, Gesa A.},
  issn         = {1354-1013},
  keyword      = {Atmospheric change,Cyanobacteria,Dissolved organic matter,Food webs,Lake,Mercury,Northern},
  language     = {eng},
  number       = {8},
  pages        = {3692--3714},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Global change-driven effects on dissolved organic matter composition : Implications for food webs of northern lakes},
  url          = {http://dx.doi.org/10.1111/gcb.14129},
  volume       = {24},
  year         = {2018},
}