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Himalayan Monals' Calls Change Due to Noise Pollution
18 Sep
Summary
- Human noise pollution is forcing Monal birds to alter their calls.
- Birds must call at higher frequencies and longer durations.
- This vocal adaptation comes at a significant biological cost.
The stunning male Himalayan Monal, adorned with iridescent rainbow plumage, and its camouflaged female are experiencing significant disruption. Their alpine to sub-alpine habitat, characterized by oaks, rhododendrons, and rocky slopes, is increasingly invaded by human activity and noise.
Research from HNB Garhwal University reveals a direct impact of this noise on the birds' communication. As human-made sounds rise, Himalayan Monals are compelled to shift their vocal frequencies upward and extend their calls to ensure audibility.
This forced adaptation is not a sign of strength but a compromise. The birds' voices are paying the price for escalating low-frequency urban and traffic noise. While their environment naturally contains sounds, the harmony is shattered by vehicles, construction, and helicopters.
This disruption extends to other avian species as well. The alteration in communication raises concerns about potential negative effects on mating success, breeding behavior, and long-term survival, with the possibility of warped biological signals and dangerous genetic bottlenecks as birds retreat to fragmented habitats.
