Shade will be a precious resource to lizards in a warming world

Mar 10, 2014
Climate change might send lizards, such as this, scrambling for shade. Credit: Jennifer Sunday, UBC

Climate change may even test lizards' famous ability to tolerate and escape the heat—making habitat protection increasingly vital—according to a new study by UBC and international biodiversity experts.

The study, published today in the Proceedings of the National Academy of Sciences, looks at the heat and cold tolerance of 296 of reptiles, insects and amphibians, known as ectotherms. The researchers discovered that regardless of latitude or elevation, cold-blooded animals across the world have similar heat tolerance limits. However, species in the tropics rely more on behaviour to survive, burrowing or finding shade to shield themselves from the sun.

"By comparing temperature tolerance limits to estimated body temperatures of animals exposed to the sun, we've found that species at low latitudes rely on shade and habitat," says UBC climate-change ecologist Jennifer Sunday, lead author on the paper. "Very few species have any extra ."

As the world warms, most ectotherms will rely increasingly on behavioral thermoregulation, making it vital to protect migration corridors and habitats that provide shade, especially in the tropics.

"We know that a lot of organisms could exist if they spent many hours in a burrow, but we also know that they can't spend all their time hiding from the sun," says Sunday. "We will have to determine their limitations."

Climate change might send lizards, such as this, scrambling for shade. Credit: Jennifer Sunday, UBC

Sunday recommends future research focus on the availability of shade habitat and the energetic consequences of the behavioral changes that may cause in the species.

Climate change might send lizards, such as this, scrambling for shade. Credit: Jennifer Sunday, UBC


Explore further: Extreme weather decides distribution of insects

More information: "Thermal safety margins and the necessity of thermoregulatory behavior across latitude and elevation," by Jennifer M. Sunday et al. www.pnas.org/cgi/doi/10.1073/pnas.1316145111

add to favorites email to friend print save as pdf

Related Stories

Extreme weather decides distribution of insects

Feb 20, 2014

As climate change is progressing, the temperature of our planet increases. This is particularly important for the large group of animals that are cold-blooded (ectothermic), including insects. Their body ...

Cool species can take the heat

May 17, 2011

(PhysOrg.com) -- Two scientists from Simon Fraser University and one from Deakin University (DU) in Australia have made a discovery that is overturning conventional wisdom about how land and marine animals react to heat.

Recommended for you

Study finds tropical fish moving into temperate waters

Dec 19, 2014

Tropical herbivorous fish are beginning to expand their range into temperate waters – likely as a result of climate change – and a new international study documents the dramatic impact of the intrusion ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.