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

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

Abstract

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.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Ekologi

Nyckelord

Originalspråkengelska
Titel på värdpublikationHydrobiologia
FörlagSpringer
Sidor101-109
Volym646
StatusPublished - 2010
PublikationskategoriForskning
Peer review utfördJa
Evenemang6th Shallow Lakes Congress 2008 - Punta del Este, Uruguay
Varaktighet: 2008 nov 232008 nov 28

Publikationsserier

Namn
Nummer1
Volym646
ISSN (tryckt)0018-8158
ISSN (elektroniskt)1573-5117

Konferens

Konferens6th Shallow Lakes Congress 2008
LandUruguay
OrtPunta del Este
Period2008/11/232008/11/28

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