🎤 Listening to a species vs. listening to a soundscape
Identifying a bird or a frog by listening to its call is relatively simple: you just need to recognise a specific sound, much as you would with a familiar ringtone. This method, often used in ornithology, allows you to pinpoint the presence of a particular species.
Analysing an entire soundscape, however, is far more complex. It involves capturing all the sounds of an ecosystem – birdsong, the rustling of leaves, the buzzing of insects, the murmur of a stream – and understanding how these sounds coexist. A balanced soundscape indicates rich biodiversity, whereas a depleted soundscape may signal an ecosystem at risk.
🔬 Why is this beneficial for biodiversity
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- Monitoring hard-to-reach environments: sensors record sounds in dense forests or on the seabed, where direct observation is difficult.
- Monitor changes in animal populations.
- Identifying the effects of global warming and deforestation
- Measuring the impact of noise pollution on wildlife.
- Detecting subtle changes: a shift in sound frequencies can indicate a decline in insect populations or the intrusion of invasive species.
- Limiting human impact: urbanisation and noise from human activities disrupt animal communication. Eco-acoustics helps to design spaces that are more considerate of living organisms.
🌍 Climate change is also leaving its mark on the soundscape
Rising temperatures, droughts and melting ice are profoundly altering natural soundscapes. Some birdsongs change as species have to adapt to new habitats, whilst others disappear as populations collapse. In the ocean, rising water acidity disrupts the propagation of underwater sound, making it harder for cetaceans to communicate. Studying these changes enables scientists to predict the effects of global warming on biodiversity.
🧪 Two classroom activities
1️- Créer un paysage sonore en classe 🎙️(Cycle 3)
- Objectifs : sensibiliser les élèves à l’écoute et à l’analyse des sons naturels et anthropiques. Comprendre comment différents types de sons coexistent et s’influencent.
- Procedure: pupils record sounds around their school (birdsong, the wind, cars, etc.) and then analyse their variety and intensity. They then list and classify these sounds into three categories: 🔵 Natural sounds (wind, birds, etc.) 🟢 Human sounds (speech, cars, etc.) 🔴 Technological sounds (telephones, computers, etc.)
This could spark a discussion about the impact of human noise on nature.
2️ – Identifying species by sound (Key Stages 3 & 4)
- Aim: To understand how scientists use audio to study biodiversity.
- Procedure: Listen to recordings of birdsong and insect sounds available on platforms such as Xeno-canto or the Natural History Museum. The pupils try to identify the species and understand their role in the ecosystem.
🌍 What if we listened more closely to nature in order to understand it better?
Eco-acoustics offers a fresh perspective on the natural world and can inspire a career in science. So let’s listen to nature and learn how to protect it better!