EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2018 | 9:30 AM - 9:45 AM | STUDY DESIGN IN FRESHWATER ECOACOUSTICS – CHOICE OF INDICATORS AND SAMPLING SCHEDULE | 310 A
STUDY DESIGN IN FRESHWATER ECOACOUSTICS – CHOICE OF INDICATORS AND SAMPLING SCHEDULE
Ecoacoustic methods are currently gaining traction in the terrestrial realm. However, freshwater ecosystems can be surprisingly noisy. Linking to the two previous talks, we will discuss indicators and study design aspects in freshwater ecoacoustics.
Using a case study from tropical North Queensland, Australia, we will discuss spatio-temporal variation in underwater soundscapes when analysed with a) single call annotation and b) ecoacoustic indices. We annotated over 8000 single acoustic events in 6 days of continuous recording– a total of 44 sound classes of fish calls, insect stridulation and biophysical sound events. We then drew rarefaction curves and found that recording interval was the key variable to capture all sounds. Ecoacoustic indices – analogous to ecological richness and diversity indices – were useful in automatically monitoring three acoustic events – variation in stream flow, a nightly chorus of aquatic insects, as well as increased activity of fish calls. While these indices are a lot easier to analyse than manual or automated call annotation, they can miss key events, such as calls by rare taxa.
- Assessment
- Communication
- Biodiversity
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Presenters/Authors
Simon Linke
(), Australian Rivers Institute - Griffith University, simon.linke@gmail.com;
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Emilia Decker
(), Griffith University, emilia.decker@googlemail.com;
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Toby Gifford
(), Monash University, toby.gifford@gmail.com;
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Camille Desjonquères
(), University of Wisconsin-Milwaukee, desjonqu@uwm.edu;
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