Delving deeper: Metabolic processes in the metalimnion of stratified lakes

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

Fersiynau electronig

Dangosydd eitem ddigidol (DOI)

  • Darren P. Giling
    Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Stechlin, Germany
  • Peter A. Staehr
    Aarhus University, Aarhus, Denmark
  • Hans Peter Grossart
    Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Stechlin, Germany
  • Mikkel Rene Andersen
    University of Copenhagen
  • Bertram Boehrer
    Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany
  • Carmelo Escot
    Empresa Metropolitana de Abastecimiento y Saneamiento de Aguas de Sevilla
  • Fatih Evrendilek
    Abant Izzet Baysal University, Turkey
  • Lluis Gomez-Gener
    University of Barcelona
  • Mark Honti
    Hungarian Academy of Sciences
  • Ian D. Jones
    Centre for Ecology & Hydrology, Lancaster
  • Nusret Karakaya
    Abant Izzet Baysal University, Turkey
  • Alo Laas
    Estonian University of Life Sciences
  • Enrique Moreno-Ostos
    University of Málaga
  • Karsten Rinke
    Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany
  • Ulrike Scharfenberger
    Leibniz Institute for Freshwater Ecology and Inland Fisheries, Berlin
  • Silke R. Schmidt
    Leibniz Institute for Freshwater Ecology and Inland Fisheries, Berlin
  • Michael Weber
    Helmholtz Centre for Environmental Research-UFZ, Magdeburg, Germany
  • R. Iestyn Woolway
    University of Reading
  • Jacob A. Zwart
    University of Notre Dame, Indiana
  • Biel Obrador
    University of Barcelona
Many lakes exhibit seasonal stratification, during which they develop strong thermal and chemical gradients. An expansion of depth-integrated monitoring programs has provided insight into the importance of organic carbon processing that occurs below the upper mixed layer. However, the chemical and physical drivers of metabolism and metabolic coupling remain unresolved, especially in the metalimnion. In this depth zone, sharp gradients in key resources such as light and temperature co-occur with dynamic physical conditions that influence metabolic processes directly and simultaneously hamper the accurate tracing of biological activity. We evaluated the drivers of metalimnetic metabolism and its associated uncertainty across 10 stratified lakes in Europe and North America. We hypothesized that the metalimnion would contribute highly to whole-lake functioning in clear oligotrophic lakes, and that metabolic rates would be highly variable in unstable polymictic lakes. Depth-integrated rates of gross primary production (GPP) and ecosystem respiration (ER) were modelled from diel dissolved oxygen curves using a Bayesian approach. Metabolic estimates were more uncertain below the epilimnion, but uncertainty was not consistently related to lake morphology or mixing regime. Metalimnetic rates exhibited high day-to-day variability in all trophic states, with the metalimnetic contribution to daily whole-lake GPP and ER ranging from 0% to 87% and < 1% to 92%, respectively. Nonetheless, the metalimnion of low-nutrient lakes contributed strongly to whole-lake metabolism on average, driven by a collinear combination of highlight, low surface-water phosphorous concentration and high metalimnetic volume. Consequently, a single-sensor approach does not necessarily reflect whole-ecosystem carbon dynamics in stratified lakes.
Iaith wreiddiolSaesneg
Tudalennau (o-i)1288-1306
CyfnodolynLimnology and Oceanography
Cyfrol62
Rhif y cyfnodolyn3
Dyddiad ar-lein cynnar9 Maw 2017
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 1 Mai 2017
Gweld graff cysylltiadau