Hydrobiologia

, Volume 686, Issue 1, pp 157–167

The impact of waterfowl herbivory on plant standing crop: a meta-analysis

  • Kevin A. Wood
  • Richard A. Stillman
  • Ralph T. Clarke
  • Francis Daunt
  • Matthew T. O’Hare
Primary Research Paper

Abstract

Waterfowl can cause substantial reductions in plant standing crop, which may have ecological and economic consequences. However, what determines the magnitude of these reductions is not well understood. Using data from published studies, we derived the relationship between waterfowl density and reduction in plant standing crop. When waterfowl density was estimated as individuals ha−1 no significant relationship with reduction in plant standing crop was detected. However, when waterfowl density was estimated as kg ha−1 a significant, positive, linear relationship with reduction in plant standing crop was found. Whilst many previous studies have considered waterfowl species as homologous, despite large differences in body mass, our results suggest that species body mass is a key determinant of waterfowl impact on plant standing crop. To examine relative impacts of waterfowl groups based on species body mass, a measure of plant biomass reduction (Rs) per bird per hectare was calculated for each group. Comparison of Rs values indicated some differences in impact between different waterfowl groups, with swans having a greater per capita impact than smaller-bodied waterfowl groups. We present evidence that this difference is linked to disparities in individual body size and associated differences in intake rates, diet composition and energy requirements. Future research priorities are proposed, particularly the need for experiments that quantify the importance of factors that determine the magnitude of waterfowl impacts on plant standing crop.

Keywords

Wildfowl density Ducks Geese Swans Rails Macrophyte biomass 

Supplementary material

10750_2012_1007_MOESM1_ESM.pdf (749 kb)
Supplementary material 1 (PDF 750 kb)

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Kevin A. Wood
    • 1
    • 2
  • Richard A. Stillman
    • 2
  • Ralph T. Clarke
    • 2
  • Francis Daunt
    • 1
  • Matthew T. O’Hare
    • 1
  1. 1.Centre for Ecology & HydrologyMidlothianUK
  2. 2.School of Conservation SciencesBournemouth UniversityDorsetUK

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