Acoustic sensors enable efficient and non-invasive monitoring of a wide range of species, including many that are difficult to monitor in other ways. Although they were initially limited in application scope largely due to cost and hardware constraints, the development of low-cost, open-source models like the Audiomoth in recent years has increased access immensely and opened up new avenues of research. For example, some teams are using them to identify illicit human activities through the detection of associated sounds, like gunshots, vehicles, or chainsaws (e.g. OpenEars).
With this relatively novel dimension of wildlife monitoring rapidly advancing in both marine and terrestrial systems, it is crucial that we identify and share information about the utility and constraints of these sensors to inform efforts. A recent study identified advancements in hardware and machine learning applications, as well as early development of acoustic biodiversity indicators, as factors facilitating progress in the field. In terms of limitations, the authors highlight insufficient reference sound libraries, a lack of open-source audio processing tools, and a need for standardization of survey and analysis protocols. They also stress the importance of collaboration in moving forward, which is precisely what this group will aim to facilitate.
If you're new to acoustic monitoring and want to get up to speed on the basics, check out these beginner's resources and conversations from across the WILDLABS platform:
Three Resources for Beginners:
- Listening to Nature: The Emerging Field of Bioacoustics, Adam Welz
- Ecoacoustics and Biodiversity Monitoring, RSEC Journal
- Monitoring Ecosystems through Sound: The Present and Future of Passive Acoustics, Ella Browning and Rory Gibb
Three Forum Threads for Beginners:
- AudioMoth user guide | Tessa Rhinehart
- Audiomoth and Natterjack Monitoring (UK) | Stuart Newson
- Help with analysing bat recordings from Audiomoth | Carlos Abrahams
Three Tutorials for Beginners:
- "How do I perform automated recordings of bird assemblages?" | Carlos Abrahams, Tech Tutors
- "How do I scale up acoustic surveys with Audiomoths and automated processing?" | Tessa Rhinehart, Tech Tutors
- Acoustic Monitoring | David Watson, Ruby Lee, Andy Hill, and Dimitri Ponirakis, Virtual Meetups
Want to know more about acoustic monitoring and learn from experts in the WILDLABS community? Jump into the discussion in our Acoustic Monitoring group!
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Description | Activity | Replies | Groups | Updated |
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Hi all, For everyone's reference but also a new one for your list Tessa (just checked and it isn't there yet) - Fuentes, M., Salamon, J., Zinemanas, P.,... |
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Acoustics | 2 years 6 months ago | |
Hi Nicole-- We've already chatted about this function, and I think the answer is "quite a bit" for a lot of deployments. The more accurately the proposed function... |
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Acoustics | 2 years 7 months ago | |
Hi Wildlabbers, This week's Tech Tutor Jamie MacAulay is talking about how to use and analyze large acoustic data using... |
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Acoustics, AI for Conservation, Marine Conservation | 2 years 7 months ago | |
Tessa-- Thanks for chiming in. I agree with a lot of what you're saying, both about what RFCX is likely to actually be doing and about the need for more open labeled... |
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Acoustics | 2 years 7 months ago | |
We are filming with the Australian Acoustic Observatory soon with one of the Solar BARs we created (it's continuously recording for four years!) and were wondering if... |
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Acoustics | 2 years 8 months ago | |
Thanks Rob! Hopefully it turns out to be a useful tool. Just to reiterate for folk, there are links to tutorials and a beta version in the blog post. |
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Acoustics | 2 years 8 months ago | |
This is a small device that sits in your backyard and monitors sounds and RF signals for wildlife. https://www.kickstarter.com/... |
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Acoustics | 2 years 11 months ago | |
Tessa Rhinehart has developed a great compilation of bioacoustic analysis platforms, software, etc. with basic functionality on each. It's openly-available on Github -https://... |
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Acoustics | 3 years ago | |
Dear Antoine, collect sound data (.wav) with the audiorecorder (audiomoth) of your choice. Point the script https://github.com/kahst/BirdNET-Lite to the location of your data... |
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Acoustics | 3 years ago | |
I didn't see this post until the digest came out, but if you still need some comments... I suggest asking this question on one of the sound recordists forums. The... |
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Cleaning audiomoth circuit board
17 January 2023 11:42am
2 February 2023 8:13am
Hi Akiba,
thanks for your this great advice! I used the conformal coating on parts
of the PCB with exposed metal but was has hesitent using it on the "backside" with
all the resistors and transistors. Also what about the "back" of the microfon. Might this side be coated?
Do you have any experience with coatings @alex_rogers
Greetings,
Robin
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Cleaning the water damaged audiomoth boards is in full swing:
Left before, right after cleaning
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Commercially available connected audio sensors
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2 February 2023 3:55pm
Hi!
I am not aware of any such connected loggers/recorders but they would be nice.
The AudioMoths have been revolutionary in providing audologging at a low cost but they take a lot of "data muling" (carrying SD cards in and out of the field sites) and swapping of batteries.
Cheers,
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Hi Lars, thanks for the response. We are using lots of Song Meter Micro's atm and they have proved to be resilient. Just need something which doesn't involve going on site regularly - but get the data off.
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Although not a professor, I know a fair number through long-term association with scgis.org, and personally am using Audiomoths in collaboration with the UC System at the Blue Oak Reserve.
I've developed a fair bit of scripts to automatically crunch things using 'Birdnet', as per:
I can certainly facilitate dialogue with the Cornell Ornithology lab if you do not have those connections already.
My own background is in remote sensing (SAR, etc) and currently working in machine learning (albeit for health care currently..) this project sounds fascinating!
Are you already working with Audubon, and/or people in the UC System?
10 December 2022 6:22am
I'll also note that I'm planning to work with a few parks in the DRC/Congo basin to deploy Audiomoths alongside their camera traps.
13 January 2023 12:24pm
Dear Antonio,
It is a long-shot, but this may be relevant to what you are looking for? I have collected across 4 seasons (2022) 8-10 days/season acoustic data from 11 stations located at pine forests of different post-fire regeneration stage (>20 years since last burn, burnt in 2001, 2009, 2018) in Greece. These are typical Mediterranean forest pine landscapes - but certainly not in California or South Africa. We did not have plans at present to continue collecting data - since we got all seasons of one year, but may be the existing data or future data from these or similar areas here in Greece would be relevant to what you wish to accomplish with the airborne measurements?
Feel free to drop me a line.
All the best,
Christos
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3 November 2022 12:34pm
Hi Ellie - OK sure thing - I can set up an article too.
4 November 2022 3:47pm
Hi Jamie, this is super exciting! I had not realized that PAMGuard integration was going to be part of the plan for Tethys - so thrilling!
One quick question - when processing large datasets, often I end up with a series of binary/database files (e.g., separate runs for separate frequency bands). Does Tethys accommodate the multiple file scenario?
Would love to give it a whirl when appropriate.
7 November 2022 12:32pm
Yeah, it's an exciting project. Also will be a great excuse to improve PAMGuard documentation - something sorely needed. Python libraries also on the way as part of this.
As for Tethys, yes it will accommodate the multiple configuration file scenario - ideally the end game will be that any configuration you use in PAMGuard will be directly exportable to a Tethys database. If you use multiple configurations, then each is a separate Tethys database, however, when these are exported they can be amalgamated into one because the Tethys is clever enough to know these are the same data processed in different ways.
"Would love to give it a whirl when appropriate. " - might be a while but noted! :-)
28 January 2023 5:40am
I'd also add that if the boards are just dirty or dusty, you can just remove all batteries, then wash with a toothbrush and water. Air dry (or use compressed air which speeds things up greatly) and then spot clean areas that need solvent with isopropanol as Harold mentioned. Also if you don't have access to conformal coating, you can also use a non-conductive clear lacquer. The conformal coating covers all the components and prevents short circuits due to conductive water (ie: salt water) or other contaminants. However if you do use a conformal coating, make sure all cables are connected first and the device is in the exact state that it will be deployed in. Also don't conformal coat the battery connectors since you'll want to change out batteries periodically.