, Volume 165, Issue 1, pp 143–151

Birds help plants: a meta-analysis of top-down trophic cascades caused by avian predators

Plant-Animal interactions - Original Paper

DOI: 10.1007/s00442-010-1774-2

Cite this article as:
Mäntylä, E., Klemola, T. & Laaksonen, T. Oecologia (2011) 165: 143. doi:10.1007/s00442-010-1774-2


The tritrophic interactions between plants, herbivores and avian predators are complex and prone to trophic cascades. We conducted a meta-analysis of original articles that have studied birds as predators of invertebrate herbivores, to compare top-down trophic cascades with different plant responses from different environments and climatic areas. Our search found 29 suitable articles, with a total of 81 separate experimental study set-ups. The meta-analysis revealed that plants benefited from the presence of birds. A significant reduction was observed in the level of leaf damage and plant mortality. The presence of birds also positively affected the amount of plant biomass, whereas effects on plant growth were negligible. There were no differences in the effects between agricultural and natural environments. Similarly, plants performed better in all climatic areas (tropical, temperate and boreal) when birds were present. Moreover, both mature plants and saplings gained benefits from the presence of birds. Our results show that birds cause top-down trophic cascades and thus they play an integral role in ecosystems.


Herbivory Indirect effects Meta-analysis Predation Trophic interactions 

Supplementary material

442_2010_1774_Fig2_ESM.jpg (6.1 mb)

Electronic Supplemental Material 1 A normal quantile plot with 95 % confidence interval lines for examining publication bias of the studies used in the overall effect meta-analysis (N = 44) (JPEG 6221 kb)

442_2010_1774_Fig3_ESM.jpg (434 kb)

Electronic Supplemental Material 2 A funnel plot showing the relationship between the effect size (lnR) and sample size of the original studies (N = 44). N is the combined sample size of treatment and control plots. The two outliers are the two studies of algae as plants (Wootton 1992, 1995) (JPEG 434 kb)

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Elina Mäntylä
    • 1
  • Tero Klemola
    • 1
  • Toni Laaksonen
    • 1
    • 2
  1. 1.Section of Ecology, Department of BiologyUniversity of TurkuTurkuFinland
  2. 2.Finnish Museum of Natural HistoryUniversity of HelsinkiHelsinkiFinland

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