Open Access Repository

Top carnivore decline has cascading effects on scavengers and carrion persistence

Cunningham, CX, Johnson, CN ORCID: 0000-0002-9719-3771, Barmuta, LA ORCID: 0000-0002-8946-3727, Hollings, T, Woehler, EJ ORCID: 0000-0002-1125-0748 and Jones, ME ORCID: 0000-0001-7558-9022 2018 , 'Top carnivore decline has cascading effects on scavengers and carrion persistence' , Proceedings of the Royal Society B: Biological Sciences, vol. 285, no. 1892 , pp. 1-10 , doi: 10.1098/rspb.2018.1582.

Full text not available from this repository.

Abstract

Top carnivores have suffered widespread global declines, with well-documented effects on mesopredators and herbivores. We know less about how carnivores affect ecosystems through scavenging. Tasmania's top carnivore, the Tasmanian devil (Sarcophilus harrisii), has suffered severe disease-induced population declines, providing a natural experiment on the role of scavenging in structuring communities. Using remote cameras and experimentally placed carcasses, we show that mesopredators consume more carrion in areas where devils have declined. Carcass consumption by the two native mesopredators was best predicted by competition for carrion, whereas consumption by the invasive mesopredator, the feral cat (Felis catus), was better predicted by the landscape-level abundance of devils, suggesting a relaxed landscape of fear where devils are suppressed. Reduced discovery of carcasses by devils was balanced by the increased discovery by mesopredators. Nonetheless, carcasses persisted approximately 2.6-fold longer where devils have declined, highlighting their importance for rapid carrion removal. The major beneficiary of increased carrion availability was the forest raven (Corvus tasmanicus). Population trends of ravens increased 2.2-fold from 1998 to 2017, the period of devil decline, but this increase occurred Tasmania-wide, making the cause unclear. This case study provides a little-studied potential mechanism for mesopredator release, with broad relevance to the vast areas of the world that have suffered carnivore declines.

Item Type: Article
Authors/Creators:Cunningham, CX and Johnson, CN and Barmuta, LA and Hollings, T and Woehler, EJ and Jones, ME
Keywords: top carnivore, carrion, scavengers, feral cat
Journal or Publication Title: Proceedings of the Royal Society B: Biological Sciences
Publisher: Royal Soc London
ISSN: 0962-8452
DOI / ID Number: 10.1098/rspb.2018.1582
Copyright Information:

Copyright 2018 The Authors

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP