Menu

Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Dissolved Organic Nitrogen Inputs from Wastewater Treatment Plant Effluents Increase Responses of Planktonic Metabolic Rates to Warming.

Author:
  • Raquel Vaquer-Sunyer
  • Daniel Conley
  • Saraladevi Muthusamy
  • Markus V Lindh
  • Jarone Pinhassi
  • Emma Kritzberg
Publishing year: 2015
Language: English
Pages: 11411-11420
Publication/Series: Environmental Science & Technology
Volume: 49
Issue: 19
Document type: Journal article
Publisher: The American Chemical Society (ACS)

Abstract english

Increased anthropogenic pressures on coastal marine ecosystems in the last century are threatening their biodiversity and functioning. Global warming and increases in nutrient loadings are two major stressors affecting these systems. Global warming is expected to increase both atmospheric and water temperatures and increase precipitation and terrestrial runoff, further increasing organic matter and nutrient inputs to coastal areas. Dissolved organic nitrogen (DON) concentrations frequently exceed those of dissolved inorganic nitrogen in aquatic systems. Many components of the DON pool have been shown to supply nitrogen nutrition to phytoplankton and bacteria. Predictions of how global warming and eutrophication will affect metabolic rates and dissolved oxygen dynamics in the future are needed to elucidate their impacts on biodiversity and ecosystem functioning. Here, we experimentally determine the effects of simultaneous DON additions and warming on planktonic community metabolism in the Baltic Sea, the largest coastal area suffering from eutrophication-driven hypoxia. Both bacterioplankton community composition and metabolic rates changed in relation to temperature. DON additions from wastewater treatment plant effluents significantly increased the activation energies for community respiration and gross primary production. Activation energies for community respiration were higher than those for gross primary production. Results support the prediction that warming of the Baltic Sea will enhance planktonic respiration rates faster than it will for planktonic primary production. Higher increases in respiration rates than in production may lead to the depletion of the oxygen pool, further aggravating hypoxia in the Baltic Sea.

Keywords

  • Environmental Sciences

Other

Published
  • ISSN: 1520-5851
Emma Kritzberg
E-mail: emma [dot] kritzberg [at] biol [dot] lu [dot] se

Senior lecturer

Aquatic ecology

+46 46 222 40 79

E-C110

50

Research group

Aquatic Ecology

Projects

Doctoral students and postdocs

PhD students, main supervisor

PhD students, assistant supervisor

Post docs

Johanna Sjöstedt