Incorporating anthropogenic effects into trophic ecology: predator - prey interactions in a human-dominated landscape

Ine Dorresteijin, Jannik Schultner, Dale Nimmo, Joern Fischer, Jan Hanspach, Tobias Kuemmerle, Euan G. Ritchie

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

Apex predators perform important functions that regulate ecosystems world- wide. However, little is known about how ecosystem regulation by predators is influenced by human activities. In particular, how important are top-down effects of predators relative to direct and indirect human-mediated bottom-up and top-down processes? Combining data on species' occurrence from camera traps and hunting records, we aimed to quantify the relative effects of top- down and bottom-up processes in shaping predator and prey distributions in a human-dominated landscape in Transylvania, Romania. By global standards this system is diverse, including apex predators (brown bear and wolf), mesopredators (red fox) and large herbivores (roe and red deer). Humans and free-ranging dogs represent additional predators in the system. Using structural equation modelling, we found that apex predators suppress lower trophic levels, especially herbivores. However, direct and indirect top- down effects of humans affected the ecosystem more strongly, influencing species at all trophic levels. Our study highlights the need to explicitly embed humans and their influences within trophic cascade theory. This will greatly expand our understanding of species interactions in human-modified landscapes, which compose the majority of the Earth's terrestrial surface.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume282
Issue number1814
DOIs
Publication statusPublished - Sep 2015

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