CSU Study Highlights Evolutionary Impact

A recent study led by Charles Sturt University has revealed that human activities are significantly altering wildlife food webs, affecting predator-prey interactions globally. The findings were published in a leading ecology and evolution journal in 2026.

Researchers from Charles Sturt University, with support from Charles Darwin University, found that human-induced changes such as fishing, climate change, species introductions, and pollution have altered the physical and behavioural traits of both predators and prey.

The study highlights that fisheries’ preference for larger fish has led to reduced body size and age structure in certain species, increasing their vulnerability to predators. Such changes can cascade through ecosystems, affecting species abundance, vegetation, and nutrient cycling.

Long-Term Consequences for Ecosystems

Dr Chris Jolly, a co-author and adjunct at CDU’s Research Institute for the Environment and Livelihoods, explained that these physical changes have significant implications for food webs. “That matters because predator-prey interactions underpin the evolution of entire ecosystems,” Dr Jolly said.

Animal trait shifts might not always be visible or immediate but could lead to long-term effects such as population declines or local extinctions. “Trait shifts can build over time, leading to cascading effects,” Dr Jolly noted.

Study lead author Dr Eamonn Wooster from CSU emphasised that addressing these effects requires measures beyond individual actions. He pointed out that stopping size-selective hunting and fishing could help restore natural variation in populations.

While some quick fixes are possible, tackling larger issues like climate change or urbanization involves preventing these disturbances themselves. “The end of size-selective hunting and fishing will help return natural variation to populations,” Dr Wooster added.

The research underscores the importance of understanding how human activities drive changes in wildlife interactions. By doing so, better conservation strategies can be designed, focusing not just on individual species but on the dynamic relationships between them.

Last updated: 29 June 2026, 11:58 am