@article {57981, title = {Six steps towards operationalising freshwater ecoacoustic monitoring}, journal = {Freshwater Biology}, volume = {65}, year = {2020}, month = {Feb-01-2021}, pages = {1 - 6}, abstract = {

1. Applications in bioacoustics and its sister discipline ecoacoustics have increased exponentially over the last decade. However, despite knowledge about aquatic bioacoustics dating back to the times of Aristotle and a vast amount of background literature to draw upon, freshwater applications of ecoacoustics have been lagging to date.

2.In this special issue, we present nine studies that deal with underwater acoustics, plus three acoustic studies on water-dependent birds and frogs. Topics include automatic detection of freshwater organisms by their calls, quantifying habitat change by analysing entire soundscapes, and detecting change in behaviour when organisms are exposed to noise.

3.We identify six major challenges and review progress through this special issue. Challenges include characterisation of sounds, accessibility of archived sounds as well as improving automated analysis methods. Study design considerations include characterisation analysis challenges of spatial and temporal variation. The final key challenge is the so far largely understudied link between ecological condition and underwater sound.

4.We hope that this special issue will raise awareness about underwater soundscapes as a survey tool. With a diverse array of field and analysis tools, this issue can act as a manual for future monitoring applications that will hopefully foster further advances in the field.

}, keywords = {ecoacoustics, Ecological Monitoring, freshwater, passive acoustics, underwater sounds}, issn = {0046-5070}, doi = {10.1111/fwb.v65.110.1111/fwb.13426}, url = {https://onlinelibrary.wiley.com/toc/13652427/65/1}, author = {Linke, Simon and Gifford, Toby and Desjonqu{\`e}res, Camille} } @article {57628, title = {Exploring the soundscape of small freshwater lakes}, year = {2019}, abstract = {

Monitoring freshwater ecosystems using passive acoustics is a largely unexplored approach, despite having the potential to yield information about the biological, geological and anthropogenic activity of a lake or river system. The state of Minnesota, located in the upper Midwest of the USA and nicknamed \‘land of 10,000 lakes\’, provides an interesting case study for soundscape research, because lakes offer ecological, recreational and economic value throughout the area. The underwater soundscape was monitored at fifteen small lakes \<10 km2 on representative days in winter (during 100\% ice cover) and summer 2018 using a hydrophone suspended 2 m below the water\&$\#$39;s surface. Median broadband sound pressure level (100\–12,000 Hz) was significantly lower in winter (57.2 dB re 1\μPa) compared to summer (66.7 dB re 1\μPa), possibly because low frequency wind sounds were reduced in winter. Recordings suggest small freshwater lakes in Minnesota have a relatively pristine soundscape, where vocalizing aquatic animals may hold acoustic niches. However, sound from anthropogenic activity was also present in the study lakes. Ice auger and motorboat sound increased the intensity of the soundscape by 10 dB and overlapped the frequency range (300\–1000 Hz) of biological sounds in the environment, that may be important to aquatic life. Understanding current baseline sound levels in ecologically significant freshwater lakes, like those in this study, is the first step in determining any potential consequences of anthropogenic sound. Moving forward, baseline sound levels provide vital evidence for scientists and governing bodies to make proactive decisions for soundscape conservation.

}, keywords = {Ambient sound, anthropogenic noise, freshwater, Lakes, underwater sound}, doi = {10.1016/j.ecoinf.2019.101018}, url = {https://linkinghub.elsevier.com/retrieve/pii/S1574954119303292}, author = {Putland, R.L. and Allen F. Mensinger} } @article {52799, title = {Freshwater ecoacoustics as a tool for continuous ecosystem monitoring}, journal = {Frontiers in Ecology and the Environment}, year = {2018}, month = {03/2018}, abstract = {

Abstract
Passive acoustic monitoring is gaining popularity in ecology as a practical and non-invasive approach to surveying ecosystems. This technique is increasingly being used to monitor terrestrial systems, particularly bird populations, given that it can help to track temporal dynamics of populations and ecosystem health without the need for expensive resampling. We suggest that underwater acoustic monitoring presents a viable, non-invasive, and largely unexplored approach to monitoring freshwater ecosystems, yielding information about three key ecological elements of aquatic environments \– (1) fishes, (2) macroinvertebrates, and (3) physicochemical processes \– as well as providing data on anthropogenic noise levels. We survey the literature on this approach, which is substantial but scattered across disciplines, and call for more cross-disciplinary work on recording and analysis techniques. We also discuss technical issues and knowledge gaps, including background noise, spatiotemporal variation, and the need for centralized reference collection repositories. These challenges need to be overcome before the full potential of passive acoustics in dynamic detection of biophysical processes can be realized and used to inform conservation practitioners and managers.

}, keywords = {anthropogenic noise, fishes, freshwater, macroinvertebrates, monitoring, physicochemical}, doi = {10.1002/fee.1779}, url = {https://doi.org/10.1002/fee.1779}, author = {Linke, Simon and Gifford, Toby and Desjonqu{\`e}res, Camille and Tonolla, Diego and Aubin, Thierry and Barclay, Leah and Karaconstantis, Chris and Kennard, Mark J. and Rybak, Fanny and Sueur, Jerome} }