A bird’s habitat can change its song, says new study

A recent study on the Bachman’s sparrow suggests that the physical environment plays an important role in determining which birdsongs are learned and transmitted across generations.

• Like human language, birdsong is dynamic—young birds learn only a subset of the songs used by their community, while some songs gradually disappear and others become more common.

Key Findings of the Study

• During their song-learning phase, young Bachman’s sparrows appear to prefer songs that travel more effectively through their habitat.
• Researchers found that rare song types propagated less effectively than common songs when transmitted through natural environments such as:
  • Dense forests
  • Shrublands
  • Windy open areas
• Songs that become distorted or degraded by environmental conditions are less likely to be learned by juvenile birds, causing such song types to become increasingly rare over time.

Acoustic Adaptation Hypothesis

• The findings support the Acoustic adaptation hypothesis.
• The hypothesis proposes that habitat structure and environmental conditions influence the evolution of animal vocalisations, favouring sounds that transmit most efficiently in a particular environment.

Examples

• Monkeys living in dense rainforests use low-frequency calls, which travel farther through thick vegetation.
• Frogs inhabiting fast-flowing streams produce high-pitched (shrill) calls that can be heard over the sound of running water.
• Similarly, Bachman’s sparrows are more likely to retain songs that remain clear after travelling through their natural habitat.

Significance

• Demonstrates that natural selection acts not only on physical traits but also on communication signals.
• Highlights the role of habitat and climate in shaping animal behaviour and cultural transmission.
• Suggests that environmental changes such as habitat degradation and climate change may influence the evolution of animal communication systems over time.

Source: New York Times

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