Recovery of African wild dogs suppresses prey but does not trigger a trophic cascade

Adam T. Ford, Jacob R. Goheen, David J. Augustine, Margaret F. Kinnaird, Timothy G. O'Brien, Todd M. Palmer, Robert Mitchell Pringle, Rosie Woodroffe

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Increasingly, the restoration of large carnivores is proposed as a means through which to restore community structure and ecosystem function via trophic cascades. After a decades-long absence, African wild dogs (Lycaon pictus) recolonized the Laikipia Plateau in central Kenya, which we hypothesized would trigger a trophic cascade via suppression of their primary prey (dik-dik, Madoqua guentheri) and the subsequent relaxation of browsing pressure on trees. We tested the trophic-cascade hypothesis using (1) a 14-year time series of wild dog abundance; (2) surveys of dik-dik population densities conducted before and after wild dog recovery; and (3) two separate, replicated, herbivore-exclusion experiments initiated before and after wild dog recovery. The dik-dik population declined by 33% following wild dog recovery, which is best explained by wild dog predation. Dik-dik browsing suppressed tree abundance, but the strength of suppression did not differ between before and after wild dog recovery. Despite strong, top-down limitation between adjacent trophic levels (carnivore- herbivore and herbivore-plant), a trophic cascade did not occur, possibly because of a time lag in indirect effects, variation in rainfall, and foraging by herbivores other than dik-dik. Our ability to reject the trophic-cascade hypothesis required two important approaches: (1) temporally replicated herbivore exclusions, separately established before and after wild dog recovery; and (2) evaluating multiple drivers of variation in the abundance of dik-dik and trees. While the restoration of large carnivores is often a conservation priority, our results suggest that indirect effects are mediated by ecological context, and that trophic cascades are not a foregone conclusion of such recoveries.

Original languageEnglish (US)
Pages (from-to)2705-2714
Number of pages10
JournalEcology
Volume96
Issue number10
DOIs
StatePublished - Oct 1 2015

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Keywords

  • Acacia
  • African wild dogs (Lycaon pictus)
  • Antelope
  • Dik-dik (Madoqua guentheri)
  • Endangered species
  • Food web
  • Indirect effect
  • Large carnivore
  • Rain
  • Savanna
  • Tree cover

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  • Cite this

    Ford, A. T., Goheen, J. R., Augustine, D. J., Kinnaird, M. F., O'Brien, T. G., Palmer, T. M., Pringle, R. M., & Woodroffe, R. (2015). Recovery of African wild dogs suppresses prey but does not trigger a trophic cascade. Ecology, 96(10), 2705-2714. https://doi.org/10.1890/14-2056.1