Rising heat linked to faster telomere loss in wild Australian birds
Extreme heat can have a profound impact on wild animals, causing their death in the most extreme cases and leaving less visible marks in others. Understanding the effects of temperature changes on specific species could inform conservation efforts and other initiatives aimed at protecting natural ecosystems from climate change.
New research published in Proceedings of the Royal Society B reveals that hotter conditions accelerate telomere shortening in wild Australian purple-crowned fairy-wrens. Telomeres, protective DNA caps at chromosome ends, shorten with stress and aging, acting as an indicator of sublethal heat stress. Despite concerns about mass mortality during extreme heat waves, researchers at Monash University, the University of Groningen, and the University of Veterinary Medicine Vienna focused on less visible physiological impacts on these birds.
Telomere shortening, accelerated by heat, can reduce fitness and may contribute to population declines. Contrary to expectations, younger birds showed no signs of reduced heat-related telomere loss, regardless of environmental or social conditions. However, adult birds in habitats with denser vegetation exhibited less telomere damage, suggesting that preserving vegetation can offer crucial climate refugia for vulnerable species facing rising temperatures.
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