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To find out how wildlife is doing, scientists try listening

October 23, 2023
in Science
To find out how wildlife is doing, scientists try listening
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An AI-assisted computer model was able to pick out bird calls from recordings made in Ecuador's Choco region

An AI-assisted computer model was able to pick out bird calls from recordings made in Ecuador’s Choco region.

A reedy pipe and a high-pitched trill duet against the backdrop of a low-pitched insect drone. Their symphony is the sound of a forest, and is monitored by scientists to gauge biodiversity.

The recording from the forest in Ecuador is part of new research looking at how artificial intelligence could track animal life in recovering habitats.

When scientists want to measure reforestation, they can survey large tracts of land with tools like satellite and lidar.

But determining how fast and abundantly wildlife is returning to an area presents a more difficult challenge—sometimes requiring an expert to sift through sound recordings and pick out animal calls.

Jorg Muller, a professor and field ornithologist at University of Wurzburg Biocenter, wondered if there was a different way.

“I saw the gap that we need, particularly in the tropics, better methods to quantify the huge diversity… to improve conservation actions,” he told AFP.

He turned to bioacoustics, which uses sound to learn more about animal life and habitats.

It is a long-standing research tool, but more recently is being paired with computer learning to process large amounts of data more quickly.

Muller and his team recorded audio at sites in Ecuador’s Choco region ranging from recently abandoned cacao plantations and pastures, to agricultural land recovering from use, to old-growth forests.

Sound of an oldgrowth forest. Credit: Jörg Müller

They first had experts listen to the recordings and pick out birds, mammals and amphibians.

Then, they carried out an acoustic index analysis, which gives a measure of biodiversity based on broad metrics from a soundscape, like volume and frequency of noises.

Finally, they ran two weeks of recordings through an AI-assisted computer program trained to distinguish 75 bird calls.

More recordings needed

The program was able to pick out the calls on which it was trained in a consistent way, but could it correctly identify the relative biodiversity of each location?

To check this, the team used two baselines: one from the experts who listened to the audio recordings, and a second based on insect samples from each location, which offer a proxy for biodiversity.

While the library of available sounds to train the AI model meant it could only identify a quarter of the bird calls the experts could, it was still able to correctly gauge biodiversity levels in each location, the study said.

“Our results show that soundscape analysis is a powerful tool to monitor the recovery of faunal communities in hyperdiverse tropical forest,” said the research published Tuesday in the journal Nature Communications.

The tool has some limitations, including the relatively few bird calls available with which to train the computer model

The tool has some limitations, including the relatively few bird calls available with which to train the computer model.

“Soundscape diversity can be quantified in a cost-effective and robust way across the full gradient from active agriculture, to recovering and old-growth forests,” it added.

There are still shortcomings, including a paucity of animal sounds on which to train AI models.

And the approach can only capture species that announce their presence.

“Of course (there is) no information on plants or silent animals. However, birds and amphibians are very sensitive to ecological integrity, they are a very good surrogate,” Muller told AFP.

He believes the tool could become increasingly useful given the current push for “biodiversity credits”—a way of monetising the protection of animals in their natural habitat.

“Being able to directly quantify biodiversity, rather than relying on proxies such as growing trees, encourages and allows external assessment of conservation actions, and promotes transparency,” the study said.

More information:
Jörg Müller, Soundscapes and deep learning enable tracking biodiversity recovery in tropical forests, Nature Communications (2023). DOI: 10.1038/s41467-023-41693-w. www.nature.com/articles/s41467-023-41693-w

© 2023 AFP

Citation:
To find out how wildlife is doing, scientists try listening (2023, October 22)
retrieved 23 October 2023
from https://phys.org/news/2023-10-wildlife-scientists.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2023-10-wildlife-scientists.html

Tags: Doingsciencewildlife
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