AUG 17, 2017 10:17 AM PDT

Climate change is killing desert songbirds

Climate change is hitting some areas and species harder than others. Deserts in the Southwest of the United States are facing more frequent, intense and widespread heat waves, and the songbirds that live there aren’t managing well. One study even estimates that many desert songbirds will be extinct by the turn of the century. The reason why? Songbirds don’t sweat.

The birds’ physiology doesn’t allow them to perspire; instead, they pant when their temperature rises. This means that in the effort of trying to cool down, their bodies are losing water; during heat waves, they can lose more than 15% of their body mass through this process and die of dehydration.

The researchers are particular in their mission: “We ask how rates of EWL vary with temperature across species; how frequently, over what areas, and how rapidly lethal dehydration occurs; how EWL and die-off risk vary with body mass; and how die-off risk is affected by climate warming,” explains the study, which was published in the journal Proceedings of the National Academy of Sciences.

Smaller birds, in particular, are at a higher threat to die from dehydration because they lose water at a proportionally higher rate. Analyzing measured rates of evaporative water loss, hourly gridded weather data, a 4 °C warming scenario, and physiological models, the study reports that lethal conditions for these small birds could quadruple. Small species like the lesser goldfinch may experience on average 25 days per year of such lethal conditions by the end of the century. The researchers fear that even those birds that do manage to survive will suffer from geographic range limits and will likely alter daily activity patterns.

Larger songbirds won’t be out of the clear either though; “Warming by 4 °C greatly expands the extent, frequency, and intensity of dehydration risk, and introduces new threats to larger passerine birds, particularly those with limited geographic ranges,” reports the study. Bigger passerines such as Curve-billed thrashers and towhees will have to deal with smaller, more crowded ranges and unpredictable water sources.

 As colors change from blue to red, the number of days per year (between April 1 and September 30) increases when the small songbird risks death within five hours. Photo: PNAS

The study urges that conservation efforts must take into consideration the impacts that a warming climate will have on desert songbirds. “This work underscores the importance of acute risks of high temperatures, particularly for small-bodied species, and suggests conservation of thermal refugia and water sources,” it states.

Sources: PNAS, Science News, Mother Jones

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
OCT 12, 2020
Chemistry & Physics
Improving activated powdered carbon to prevent algal blooms in drinking water treatment
OCT 12, 2020
Improving activated powdered carbon to prevent algal blooms in drinking water treatment
In a study published in the journal Water Research, researchers from The Korea Institute of Science and Technology ...
NOV 12, 2020
Plants & Animals
Noise Pollution Threatens Norway's Orcas
NOV 12, 2020
Noise Pollution Threatens Norway's Orcas
Orca pods heavily depend on vocal communication for survival. Their unique ability to communicate with other pod members ...
NOV 18, 2020
Health & Medicine
Rising Temperatures May Increase Tick-Borne Diseases in Humans
NOV 18, 2020
Rising Temperatures May Increase Tick-Borne Diseases in Humans
New research presented at the Annual Meeting of the American Society of Tropical Medicine and Hygiene warns that climate ...
NOV 24, 2020
Earth & The Environment
Sentinel-6 Michael Freilich will extend sea level monitoring
NOV 24, 2020
Sentinel-6 Michael Freilich will extend sea level monitoring
Days ago, a new satellite was launched from Space Launch Complex 4E at Vandenberg Air Force Base in California with the ...
DEC 14, 2020
Earth & The Environment
The luck behind our survival
DEC 14, 2020
The luck behind our survival
A study published in the Nature journal Communications Earth & Environment comments on the reasons why Earth ha ...
JAN 12, 2021
Earth & The Environment
What will become of the sharks?
JAN 12, 2021
What will become of the sharks?
What will be the future of sharks? These animals that have been around for 450 million years are in danger, threatened b ...
Loading Comments...