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Latest World News Update > Blog > Entertainment > Climate change driving ‘cost-of-living’ squeeze in lizards, finds study – World News Network
Entertainment

Climate change driving ‘cost-of-living’ squeeze in lizards, finds study – World News Network

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Last updated: January 18, 2025 12:00 am
worldnewsnetwork 6 months ago
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Melbourne [Australia], January 18 (ANI): Desert lizards are experiencing a ‘cost-of-living’ pinch as global temperatures rise, according to a new study.
A lizard’s ‘cost-of-living’ is closely related to its body temperature, which determines both how much food it requires and whether it can go outside to feed. Desert lizards face unique challenges because food is scarce and the weather is frequently too hot to forage.
The study found climate warming can ‘squeeze’ desert lizard energy budgets by increasing the food they need just to survive while decreasing their time to find it.
Lead author and University of Melbourne researcher Dr Kristoffer Wild said climate warming will affect species differently based on when they forage and illustrates the importance of tailoring conservation strategies to safeguard species populations.
“Cost-of-living is a concept humans are all too aware of, but the same concept applies to ectotherms – or cold-blooded animals – such as lizards. We just need to switch the currency from money to energy and realize that for lizards these costs and their ability to meet them depend on temperature,” Dr Wild said.
“Our study reveals that as deserts heat up, diurnal (day-active) lizards face a squeeze–needing more food while having less time to find it. On the other hand, nocturnal (night-active) lizards may benefit from warmer nights that allow more hunting time.
“In other words, it’s like diurnal lizards paying higher bills with fewer work hours, while nocturnal lizards can counter high bills by gaining extra work hours during the warmer nights.”
The researchers were able to predict the cost of living with a model that combines physics with biology. Co-author and University of Melbourne researcher, Professor Michael Kearney said they were able to test their model predictions against historical field data to quantify how climate warming impacts desert reptiles across continents.
“We were able to reconstruct, within two or three degrees, what a field biologist observed in the middle of the Australian and African deserts more than 50 years ago,” Professor Kearney said.
“This gives us confidence to predict the direct effects of climate warming on these animals in the future.
“If we can better understand the ecological processes underpinning these cost-of-living pressures, we can better anticipate the species most at risk and act accordingly.”
The researchers also found that globally, areas that have had historically more warming will face more challenges in the future.
“We can anticipate future warming impacts to be more severe in Africa than in Australia, with African desert lizards requiring more food with less time to find it,” Dr Wild said.
Researchers said the effects of warming on energy budgets are further compounded by other factors associated with climate change including food availability and increased water requirements in arid environments.
“Importantly, we show energy pressures are greatest in summer and spring, which is the reproductive window for many species,” Dr Wild said.
“Our next steps will be to bring food and water resources into our calculations and translate the results into growth and reproduction, which will help us predict whether populations will survive further change under warming.” (ANI)

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