The authors recommend that wildlife managers rethink policies for sustainable utilization. Setting limits on the number of days allowed for hunting and fishing rather than the number of trophies would be a more effective way to ensure continued supply and to prevent extinction.
Results of the study are published in the May 13 issue of Science.
“Quotas don’t consider population fluctuations caused by disease outbreaks, harsh weather and other variables that affect animal abundance from year to year,” Packer explains. “Hunters and fishermen can work harder to make their quotas when desirable species are scarce. The extra pressure can cause populations to collapse.” Setting limits on the amount of time spent hunting could better protect fragile populations.
John Fryxell and Kevin McCann, from the University of Guelph in Ontario, Canada, along with colleagues in Norway and the United States, developed a model based on mass action assumptions about human behavior and current hunting and fishing regulations. They tested the model using data from three populations of deer and moose from Canada and Norway over a 20- year period. Packer’s work on the impact of trophy hunting on lion populations in Africa and cougars in the United States, helped to inspire the current study.
The problem is exacerbated by the traditional practice of open access, Fryxell noted. Hunters and fishermen tend to choose spots based on word of mouth, which travels slowly. By the time they are well known, popular sites may already have shrinking populations and visitors may need to work harder and longer to reach quotas, which further endanger the species. Once populations are depleted, restoring them is a challenge.
“It can take decades for large animal populations to recover from collapses, as we know from our disastrous experience with cod stocks off the coast of Newfoundland, Fryxell said. “We need to make strategic long-term changes to make a difference.”
Jeff Falk | EurekAlert!
Bioinvasion on the rise
15.02.2017 | Universität Konstanz
Litter Levels in the Depths of the Arctic are On the Rise
10.02.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News