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Warmer climates boost cyanobacterial dominance in shallow lakes

Author:
  • Sarian Kosten
  • Vera L. M. Huszar
  • Eloy Becares
  • Luciana S. Costa
  • Ellen van Donk
  • Lars-Anders Hansson
  • Erik Jeppesenk
  • Carla Kruk
  • Gissell Lacerot
  • Nestor Mazzeo
  • Luc De Meester
  • Brian Moss
  • Miquel Lurling
  • Tiina Noges
  • Susana Romo
  • Marten Scheffer
Publishing year: 2012
Language: English
Pages: 118-126
Publication/Series: Global Change Biology
Volume: 18
Issue: 1
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

Dominance by cyanobacteria hampers human use of lakes and reservoirs worldwide. Previous studies indicate that excessive nutrient loading and warmer conditions promote dominance by cyanobacteria, but evidence from global scale field data has so far been scarce. Our analysis, based on a study of 143 lakes along a latitudinal transect ranging from subarctic Europe to southern South America, shows that although warmer climates do not result in higher overall phytoplankton biomass, the percentage of the total phytoplankton biovolume attributable to cyanobacteria increases steeply with temperature. Our results also reveal that the percent cyanobacteria is greater in lakes with high rates of light absorption. This points to a positive feedback because restriction of light availability is often a consequence of high phytoplankton biovolume, which in turn may be driven by nutrient loading. Our results indicate a synergistic effect of nutrients and climate. The implications are that in a future warmer climate, nutrient concentrations may have to be reduced substantially from present values in many lakes if cyanobacterial dominance is to be controlled.

Keywords

  • Ecology
  • climate change
  • cyanobacteria
  • Europe
  • light
  • nutrients
  • phytoplankton
  • shade
  • South America
  • temperature
  • trophic state

Other

Published
  • BECC
  • ISSN: 1354-1013
Lars-Anders Hansson
E-mail: lars-anders [dot] hansson [at] biol [dot] lu [dot] se

Professor

Aquatic ecology

+46 46 222 41 69

E-C140

50

Professor

NanoLund

14

Research group

Aquatic Ecology

Other projects I´m involved in

Doctoral students and postdocs

PhD students, main supervisor

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