CORVALLIS, Ore. – A continuous wall on the border between the United States and Mexico would harm a multitude of animal species by fragmenting their geographic ranges, Oregon State University distinguished professor of ecology William Ripple has concluded, supported by thousands of other scientists around the globe.

Ripple is one of 16 co-authors from the U.S. and Mexico, including four members of the National Academy of Sciences, of a paper published today in BioScience that outlines the wall’s impacts on biodiversity.

So far, more than 2,600 scientists from 43 countries and six continents have endorsed the article as signatories.

The authors include Rob Peters and Jennie Miller of the conservation nonprofit Defenders of Wildlife; Peters is the lead author of the paper.

Ripple, Peters, Miller and the others describe three ways the border wall and other security measures would threaten biodiversity: by not adhering to environmental laws, eliminating and fragmenting animal and plant populations and habitats, and devaluing binational research and conservation investments.

“Some of the affected animals are charismatic as well as threatened,” Ripple said, noting the Mexican gray wolf, Sonoran pronghorn, Peninsular bighorn sheep and jaguar. “A continuous wall would disconnect any jaguars and ocelots in the U.S. from their major range in Mexico. And it’s not just solid walls that are the issue; certain types of fencing can be a complete barrier to individual wildlife species. All of that should be considered.”

Ripple and the other authors and signatories urge the U.S. government to follow, rather than waive in the name of homeland security, federal environmental laws such as the Endangered Species Act and the National Environmental Policy Act.

The paper includes a four-point call to action:

  • Congress should ensure the Department of Homeland Security follows environmental laws, and the DHS should:
  • Conduct surveys of at-risk species, habitats and ecological resources prior to new construction;
  • Mitigate environmental harm as completely as possible;
  • Work to facilitate scientific research in the border region.

As of 2017, the DHS had constructed 1,050 kilometers of pedestrian and vehicle barriers, the paper notes.

“The border extends about 3,200 kilometers and bisects many important habitat types from desert to forest to scrublands to mountain ranges,” said Ripple. “These are important wildlife habitats, high in biological diversity, that span both sides of the border. I hope national leaders will listen to our conservation message.”

The border region, the paper states, is home to 1,506 native terrestrial and freshwater animal and plant species. Sixty-two of those species are listed as critically endangered, endangered or vulnerable by the International Union of Conversation of Nature.

Scientists are invited to join as signatories here.

In 2017, Ripple led an international team in issuing “World Scientists’ Warning to Humanity: A Second Notice,” which garnered more than 20,000 signatures from 184 nations. Scientists can still join as signatories on that article as well at http://scientistswarning.forestry.oregonstate.edu/.

College of Forestry

About the OSU College of Forestry: For a century, the College of Forestry has been a world class center of teaching, learning and research. It offers graduate and undergraduate degree programs in sustaining ecosystems, managing forests and manufacturing wood products; conducts basic and applied research on the nature and use of forests; and operates more than 15,000 acres of college forests.

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