Hunting significantly reduces bird and mammal populations • Earth.com
While many forests seem structurally undisturbed, hunting can exert significant pressure on wildlife and result in large population declines.
04-15-2017

Hunting significantly reduces bird and mammal populations

New research has found that while many tropical forests may appear structurally undisturbed, hunting can exert significant pressure on wildlife and result in large population declines.

The review covered 176 studies, which spanned from South America to Asia and Africa, encompassing 97 bird and 254 mammal species. Hunted and unhunted sites were analyzed for mammal and bird abundance and the data was used to estimate the overall reduction in these populations.

They concluded that both bird and mammal populations were significantly reduced in hunted areas – 53% and 82% respectively. Furthermore, the study found a direct relationship between population reduction and distance from hunters’ access points, urban trading markets, and protected areas. So even though mammal populations were higher inside protected areas compared to non-protected areas, nearby hunting still had a negative impact on mammal abundance within the protected areas.

It was also found that smaller mammals were almost always more abundant in places with higher hunting pressure than larger species, which the researchers say is due to smaller species experiencing a decrease in predation pressure as a result of humans hunting the more desirable medium and large-sized animals. So it goes without saying that these smaller mammals are big fans of the current hunting practices.

The authors believe a possible solution to these problems would be to increase strategies that sustainably manage wildlife hunting in both protected and unprotected tropical regions, as current strategies aren’t doing the job.

While protecting certain regions of tropical forests may help sustain some of the wildlife in that specific area, it’s important to understand the impact of hunting practices in nearby forests. Since most non-human species have a tough time reading sign postings, they’re likely to unknowingly cross between protected and non-protected areas. Studies like this are important for giving us a reality check on whether or not our protection efforts are helping.

By Connor Ertz, Earth.com Staff Writer

Source: American Association for the Advancement of Science

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