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Environment

Animals are "changing shape" in response to climate change

In a desperate effort to adapt to climate change, animals are literally changing their biology very quickly. We don't know if it will be enough.

11 September 2021
Gianluca RiccioGianluca Riccio
⚪ 4 minutes
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Climate change

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While humans continue to discuss causes (there are those who deny the influence of man after 150 years of testing), effects and possible solutions to constant global warming, animals have fewer thoughts. Only two: die, or adapt.

Some species are probably already doomed, but new research of the Deakin University in Australia indicates that many others are literally changing their shape and biology in a last ditch effort to survive.

Climate change, shape change

This "shape change" described by Deakin's research team, as mentioned, is very rapid. It includes animals that develop longer legs, larger beaks, and even bigger ears in hopes of continuing to thrive in an increasingly warm environment.

"When climate change is discussed in the media, people are asking 'can humankind overcome it?', Or 'what technology can solve it?'" Says the researcher. Sarah Ryding in the press release announcing the results of the study. "The time has come to recognize that animals also have to adapt to these changes, but this is happening in a much shorter time frame than would have occurred during most of evolutionary time."

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Dramatic transformation: the study

Published in the September 7 issue of Trends in Ecology and Evolution, the study finds that climate change itself is an ever-changing phenomenon. For this reason, the team was initially reluctant to link such rapid changes in animal physiology to this cause. However, as the press release points out, "these changes have occurred in vast geographic regions and across a wide range of species. Things that have very little in common with each other. Other than climate change."

The steadily rising temperature, the researchers indicate, has forced animals, particularly warm-blooded ones, to adapt their physiology to the changes taking place around them.

To confirm this trend, Ryding and his team focused on birds, where the greatest amount of anecdotal shape changes have been observed.

Birds are an avant-garde

First, the team found that several Australian parrot species had shown up a 4% -10% increase in beak size since 1871. This is a significant increase in just 150 years, indicates the research paper, which has been "positively correlated" with summer temperatures each year. Climatic increase in temperature, increase in the size of the beak.

This same correlation was also noted among North American dark-eyed juncos, a type of small songbird. In their case, the heat spikes in cold environments correspond to the increase in the size of the beak. The study authors also found temperature-related changes in some mammal species, including "increases in tail length reported in wild mice."

Climate change
The common wood mouse is experiencing an increase in tail length due to climate change. (Image: Christian Fischer)

Not all changes are positive

In her next phase of research, Ryding will firsthand investigate shape change in Australian birds. It will also analyze 3D scans of specimens kept in museums. This effort, he says, will give his team a better understanding of which birds are changing shape due to climate change and what is causing this phenomenon.

In concluding the study, the researchers also point out an important factor. Yes, these animals show adaptations that can improve their chances in an ever-changing environment. This however it does not mean that such changes will be enough to guarantee their survival.

The shape shift does not mean that animals are facing climate change and that everything is 'fine'. It just means they are evolving to survive. We are not sure what the other ecological consequences of these changes are, or indeed that all species are able to change and survive.

Sarah Ryding

The climate change we have created is putting a lot of pressure on animals. Some species will adapt, others will not.

Tags: animalsclimate

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