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

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

Standard

Waterfowl, macrophytes, and the clear water state of shallow lakes. / Hansson, Lars-Anders; Nicolle, Alice; Brönmark, Christer; Hargeby, Anders; Lindström, Åke; Andersson, Gunnar.

Hydrobiologia. Vol. 646 Springer, 2010. s. 101-109.

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

Harvard

Hansson, L-A, Nicolle, A, Brönmark, C, Hargeby, A, Lindström, Å & Andersson, G 2010, Waterfowl, macrophytes, and the clear water state of shallow lakes. i Hydrobiologia. vol. 646, Springer, s. 101-109, Punta del Este, Uruguay, 2008/11/23. https://doi.org/10.1007/s10750-010-0169-z

APA

Hansson, L-A., Nicolle, A., Brönmark, C., Hargeby, A., Lindström, Å., & Andersson, G. (2010). Waterfowl, macrophytes, and the clear water state of shallow lakes. I Hydrobiologia (Vol. 646, s. 101-109). Springer. https://doi.org/10.1007/s10750-010-0169-z

CBE

MLA

Vancouver

Author

Hansson, Lars-Anders ; Nicolle, Alice ; Brönmark, Christer ; Hargeby, Anders ; Lindström, Åke ; Andersson, Gunnar. / Waterfowl, macrophytes, and the clear water state of shallow lakes. Hydrobiologia. Vol. 646 Springer, 2010. s. 101-109

RIS

TY - GEN

T1 - Waterfowl, macrophytes, and the clear water state of shallow lakes

AU - Hansson, Lars-Anders

AU - Nicolle, Alice

AU - Brönmark, Christer

AU - Hargeby, Anders

AU - Lindström, Åke

AU - Andersson, Gunnar

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

KW - Herbivory

KW - Grazing

KW - Macrophyte

KW - Lake

KW - Alternative stable state

KW - Waterfowl

KW - Bird

U2 - 10.1007/s10750-010-0169-z

DO - 10.1007/s10750-010-0169-z

M3 - Paper in conference proceeding

VL - 646

SP - 101

EP - 109

BT - Hydrobiologia

PB - Springer

ER -