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Wild Pigs’ Climate Impact is Greater Than a Million Cars

By uprooting carbon trapped in soil, wild pigs are releasing around 4.9 million metric tonnes of carbon dioxide annually across the globe, the equivalent of 1.1 million cars.

Wild pigs are one of the most widespread invasive species on Earth. Image credit: Fitzroy Basin Association

 

An international team led by researchers from The University of Queensland and The University of Canterbury have used predictive population models, coupled with advanced mapping techniques to pinpoint the climate damage wild pigs are causing across five continents.

UQ’s Dr Christopher O’Bryan said the globe’s ever-expanding population of feral pigs could be a significant threat to the climate.

“Wild pigs are just like tractors ploughing through fields, turning over soil to find food,” Dr O’Bryan said.

Example of feral hogs digging in a pasture. Photo courtesy of USDA

 

“When soils are disturbed from humans ploughing a field or, in this case, from wild animals uprooting, carbon is released into the atmosphere.

“Since soil contains nearly three times as much carbon than in the atmosphere, even a small fraction of carbon emitted from soil has the potential to accelerate climate change.

“Our models show a wide range of outcomes, but they indicate that wild pigs are most likely currently uprooting an area of around 36,000 to 124,000 square kilometres, in environments where they’re not native.

“This is an enormous amount of land, and this not only affects soil health and carbon emissions, but it also threatens biodiversity and food security that are crucial for sustainable development.”

Relocation of feral swine has resulted in extensive cross-breeding with domestic pigs, producing “super pigs” that vary in color, can survive winter months, and multiply rapidly. Visual: Clint Turnage / USDA

Using existing models on wild pig numbers and locations, the team simulated 10,000 maps of potential global wild pig density.

They then modelled the amount of soil area disturbed from a long-term study of wild pig damage across a range of climatic conditions, vegetation types and elevations spanning lowland grasslands to sub-alpine woodlands.

The researchers then simulated the global carbon emissions from wild pig soil damage based on previous research in the Americas, Europe, and China.

University of Canterbury PhD candidate Nicholas Patton said the research would have ramifications for curbing the effects of climate change into the future.

“Invasive species are a human caused problem, so we need to acknowledge and take responsibility for their environmental and ecological implications,” Mr Patton said.

“If invasive pigs are allowed to expand into areas with abundant soil carbon, there may be an even greater risk of greenhouse gas emissions in the future.

“Because wild pigs are prolific and cause widespread damage, they’re both costly and challenging to manage.

Texas, Florida, Georgia, and California have vast populations of feral swine, due in part to their large litters. They can decimate crops and kill calves, lambs, and pregnant livestock. Visual: Justin Stevenson / USDA

“Wild pig control will definitely require cooperation and collaboration across multiple jurisdictions, and our work is but one piece of the puzzle, helping managers better understand their impacts.

“It’s clear that more work still needs to be done, but in the interim, we should continue to protect and monitor ecosystems and their soil which are susceptible to invasive species via loss of carbon.”

The research has been published in Global Change Biology (DOI: https://doi.org/10.1111/gcb.15769).

What Can You Do?

Feral swine are a significant problem in many states, and they continue to expand into new areas. So, a first step is to find out where feral swine problems exist and what the laws are in your area about controlling them.

 

Because of the dangers feral swine represent, a number of states have a “Squeal on Pigs” program. (Here are links to the programs in Oregon, Washington, Montana, and Alberta, Canada.) There’s even an app to help with reporting them. Agencies are trying hard to get the word out so they can track any new animals in an area and remove them. You can help by sharing information with your neighbors, and reporting anything you see.

Finally, you can learn about methods for controlling and removing feral swine here.

This is just one more way we can all work together to create healthy environments and productive, profitable grazing operations.

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