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Rising monkey and pig populations pose human disease risk

Rising monkey and pig populations pose human disease risk
2023-06-30
(Press-News.org) Exploding populations of wild pigs and macaque monkeys in Southeast Asia are threatening native forests and disease outbreaks in livestock and people, according to research led by The University of Queensland.

Dr Matthew Luskin, from UQ’s School of the Environment, and his team collated and analysed species population data from across the region, some of it collected with a network of cameras.

“Macaques and wild pigs are taking over Southeast Asia’s disturbed forests,” Dr Luskin said.

“Humans are largely to blame for this by altering forests with logging and establishing palm oil farms which provide food and ideal breeding conditions for these animals.

“We saw that wild boar and macaque numbers were 400 per cent higher in forests near the plantations than in untouched environments.

“These animals take full advantage of the farmland, raiding crops and thriving on calorie‐rich foods.”

Setting and monitoring the camera traps provided Dr Luskin with an up-close experience of the exploding numbers.

“I encountered huge troops of macaques in Thailand, Malaysia, and Indonesia – they were everywhere in the forest edges, following us and interfering with our equipment,” Dr Luskin said.

“At first it was frustrating but then was eerie as we became completely surrounded.”

Dr Luskin said there were significant human health risks in the rising pig and macaque populations.

“The wildlife origins of the COVID-19 pandemic show that mammals in human-modified ecosystems often host high pathogen loads and pose serious zoonotic disease risks,” he said.

“Both pigs and macaques are recognised as carriers of diseases that can be transmitted to people and they’re the most common species in a region considered to be the global zoonotic disease hotspot.”

Collaborator, Professor Carlos Peres from the University of East Anglia (UK), said abnormally high populations of wildlife species that are disease reservoirs often occur in human-modified tropical forests.

“This study again shows that densely settled rural areas in Southeast Asia may be a source of future human epidemics,” he said.

University of East Anglia and Southern University of Science and Technology (China) PhD candidate, Jonathan Moore, said the immediate effects of the population explosions could be seen on native flora in the affected regions.

“Both pigs and macaques trigger negative cascading impacts in these pristine ecosystems,” Mr Moore said.

“They kill the seeds and seedlings of native plants and eat bird and reptile eggs.

“The Malaysian pigs alone were found to reduce rainforest tree regeneration by 62 per cent.”

The researchers say action is needed to minimise population expansions of wild pigs and macaques.

“Efforts to manage the populations of these species have failed in the past because of their rapid reproductive capacity and public outcry,” Dr Luskin said.

“Nobody favours needless killing of wildlife but the negative social and ecological impacts from hyperabundant pest species does demand ethical and urgent management solutions.”

The research is published in Biological Reviews.

Images and video are available via Dropbox.

END

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[Press-News.org] Rising monkey and pig populations pose human disease risk