Menu

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

Waterfowl, macrophytes, and the clear water state of shallow lakes

Author:
  • Lars-Anders Hansson
  • Alice Nicolle
  • Christer Brönmark
  • Anders Hargeby
  • Åke Lindström
  • Gunnar Andersson
Publishing year: 2010
Language: English
Pages: 101-109
Publication/Series: Hydrobiologia
Volume: 646
Issue: 1
Document type: Conference paper
Publisher: Springer

Abstract english

The importance of lake ecosystems for waterfowl remains a topic of debate. In order to assess how temporal variations in lake features, specifically shifts between alternative stable states, may interact with the waterfowl fauna, we performed a long-term (22 years) study of the shallow Lake Krankesjon, southern Sweden. Lower total numbers of waterfowl occurred during periods with low macrophyte cover and turbid water, than when submersed macrophytes flourished and the water was clear. Some specific functional groups of waterfowl, such as herbivores, invertebrate, and fish feeders, showed a positive relation to clear water and high macrophyte cover. Hence, our data suggest that some migratory waterfowl may select lakes based on water quality, thereby adjusting their large-scale migratory routes. On the other hand, omnivorous waterfowl exhibited their highest abundances during turbid conditions. Furthermore, waterfowl not primarily relying on food from the lake showed no response to fluctuations in turbidity or macrophyte cover, but followed regional trends in population dynamics. In our study lake, L. Krankesjon, we estimated that waterfowl remove less than 3% of the macrophyte biomass during a stable clear-water state with lush macrophyte beds. However, during transition periods between alternative stable states, when macrophyte biomass is lower and the plants already stressed, the consumption rate of waterfowl may have a stronger effect on lake ecosystem functioning.

Keywords

  • Ecology
  • Herbivory
  • Grazing
  • Macrophyte
  • Lake
  • Alternative stable state
  • Waterfowl
  • Bird

Other

6th Shallow Lakes Congress 2008
2008-11-23 - 2008-11-28
Punta del Este, Uruguay
Published
  • Centre for Animal Movement Research
  • ISSN: 0018-8158
  • ISSN: 1573-5117
Christer Brönmark
E-mail: christer [dot] bronmark [at] biol [dot] lu [dot] se

Head of unit

Division aquatic ecology

+46 46 222 37 02

+46 73 081 55 48

E-C125

Sölvegatan 37, Lund

50

Professor

Aquatic Ecology

50

Professor

Division aquatic ecology

+46 46 222 37 02

+46 73 081 55 48

E-C125

Sölvegatan 37, Lund

50

Research group

Aquatic Ecology

Projects

Doctoral students and postdocs

PhD students, main supervisor

Jerker Vinterstare

PhD students, assistant supervisor

  • Nan Hu
  • Varpu Pärssinen
  • Yongcui Sha
  • Downloads & links

    Centre for Animal Movement Research (CAnMove)

    My ResearchGate page

    Slim and fat fsh