scholarly journals Trophic rewilding establishes a landscape of fear: Tasmanian devil introduction increases risk‐sensitive foraging in a key prey species

Ecography ◽  
2019 ◽  
Vol 42 (12) ◽  
pp. 2053-2059 ◽  
Author(s):  
Calum X. Cunningham ◽  
Christopher N. Johnson ◽  
Tracey Hollings ◽  
Kaely Kreger ◽  
Menna E. Jones
Keyword(s):  
Prey Species ◽  
Tasmanian Devil ◽  
Landscape Of Fear ◽  
Risk Sensitive ◽  
Risk Sensitive Foraging

scholarly journals Top carnivore decline has cascading effects on scavengers and carrion persistence

2018 ◽  
Vol 285 (1892) ◽  
pp. 20181582 ◽  
Author(s):  
Calum X. Cunningham ◽  
Christopher N. Johnson ◽  
Leon A. Barmuta ◽  
Tracey Hollings ◽  
Eric J. Woehler ◽  
...  
Keyword(s):  
Severe Disease ◽  
Tasmanian Devil ◽  
Population Declines ◽  
Mesopredator Release ◽  
Landscape Of Fear ◽  
Feral Cat ◽  
Cascading Effects ◽  
Remote Cameras

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.

A model of risk-sensitive foraging for a reproducing animal

1991 ◽  
Vol 41 (5) ◽  
pp. 787-792 ◽  
Author(s):  
John M. McNamara ◽  
Salah Merad ◽  
Alasdair I. Houston
Keyword(s):  
Risk Sensitive ◽  
Risk Sensitive Foraging

Tufted titmouse (Baeolophus bicolor) calling and risk-sensitive foraging in the face of threat

2014 ◽  
Vol 17 (6) ◽  
pp. 1341-1352 ◽  
Author(s):  
Todd M. Freeberg ◽  
Tatjana Krama ◽  
Jolanta Vrublevska ◽  
Indriķis Krams ◽  
Cecilia Kullberg
Keyword(s):  
Risk Sensitive ◽  
The Face ◽  
Tufted Titmouse ◽  
Risk Sensitive Foraging

scholarly journals Energy budgets and risk-sensitive foraging in starlings

1999 ◽  
Vol 10 (3) ◽  
pp. 338-345 ◽  
Author(s):  
Fausto Brito e Abreu ◽  
Alex Kacelnik
Keyword(s):  
Energy Budgets ◽  
Risk Sensitive ◽  
Risk Sensitive Foraging

Testosterone levels in feces predict risk-sensitive foraging in hummingbirds

2014 ◽  
Vol 45 (5) ◽  
pp. 501-506 ◽  
Author(s):  
C. A. Chávez-Zichinelli ◽  
L. Gómez ◽  
R. Ortiz-Pulido ◽  
C. Lara ◽  
R. Valdéz ◽  
...  
Keyword(s):  
Testosterone Levels ◽  
Risk Sensitive ◽  
Risk Sensitive Foraging
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