Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Helping carnivores and people co-exist

25.11.2003


Keeping predators at bay with flashing lights and loud noises instead of bullets



When wolves and other large carnivores threaten people and livestock, wildlife managers often resort to killing them. But now there’s hope for a non-lethal solution to controlling carnivores. New research shows that movement-activated guards with strobe lights and sound recordings can help keep wolves and bears away.

"High-technology devices are much more expensive, complicated and limited in effectiveness than a single bullet from a high-powered rifle, but they also allow a predator to live - surely the goal of conservation," say John Shivik of the United States Department of Agriculture, Wildlife Services, National Wildlife Research Center and Utah State University in Logan; Adrian Treves, who did this work while at Conservation International in Madison, Wisconsin, and is now at the Wildlife Conservation Society in Bronx, New York; and Peggy Callahan of the Wildlife Science Center in Forest Lake, Minnesota.


This work is part of a six-paper special section co-edited by Treves on the conflict between people and carnivores in the December issue of Conservation Biology.

Conflicts between people and carnivores are rising as people spread into remote habitats and as large carnivores recover from past eradication efforts. While wildlife managers often address these conflicts by killing "problem" animals, this runs counter to conservation efforts and could impede the recovery of rare carnivores. "To promote the existence and expansion of large carnivores, conservation biologists should assist with the real-world problems predators cause," say the researchers.

To help find non-lethal ways of controlling carnivores, Shivik and his colleagues did two experiments to see if movement-activated devices could deter predators from feeding. First, the researchers compared the predators’ consumption of road-killed deer carcasses before and after treating them with movement-activated guards. This experiment was done on wild predators including wolves and bears in northwest Wisconsin; the carcasses were replaced regularly; the pre-treatment and treatment periods ranged from roughly a week to a month; and the movement-activated guards had strobe lights and recordings of 30 sounds, including yelling, gunfire and helicopters.

In the second experiment, the researchers compared wolves’ consumption of sled-dog chow before and after treating it with movement-activated guards. This experiment was done on captive wolves at the Wildlife Science Center in Forest Lake, Minnesota, and the researchers determined how much of a 1-kg portion of sled-dog chow the wolves ate in an hour.

Both experiments showed that the movement-activated guards deterred the predators from feeding. In the experiment with wild predators, the movement-activated guards decreased the consumption of deer carcasses by about two-thirds (from roughly 3.3 to 1 kg per day). Similarly, in the experiment with captive wolves, the movement-activated guards decreased the consumption of dog food by about three-quarters (from roughly 0.8 to 0.2 kg).

The movement-activated guards have some drawbacks: they do not keep the predators away completely, and they are too costly and complicated to be feasible for many wildlife managers. Even so, movement-activated guards are still promising. "Non-lethal approaches to managing predation ...provide a means for conservation biologists to target areas with high predation levels and increase acceptance of large mammalian predators," say Shivik and his colleagues.

CONTACT:

John Shivik: 435-797-1348, 435-245-6091, john.shivik@aphis.usda.gov)
Adrian Treves: 718-741-8197, atreves@wcs.org)

John Shivik | Society for Conservation Biology
Further information:
http://www.conbio.org/SCB/Services/Tips/2003-12-Dec.cfm

More articles from Ecology, The Environment and Conservation:

nachricht Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen

nachricht A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>