[MARMAM] New publication: Effects of subsampling on passive acoustic monitoring data

Karolin Thomisch Karolin.Thomisch at awi.de
Wed Jul 15 13:37:18 PDT 2015


Dear colleagues,

we are pleased to announce the publication of the following article:

Effects of subsampling of passive acoustic recordings on acoustic metrics (2015).
Karolin Thomisch, Olaf Boebel, Daniel P. Zitterbart, Flore Samaran, Sofie Van Parijs and Ilse Van Opzeeland.
Journal of the Acoustical Society of America 138(1), 267-278;
http://dx.doi.org/10.1121/1.4922703


Abstract:

Passive acoustic monitoring is an important tool in marine mammal studies. However, logistics and finances frequently constrain the number and servicing schedules of acoustic recorders, requiring a trade-off between deployment periods and sampling continuity, i.e., the implementation of a subsampling scheme. Optimizing such schemes to each project's specific research questions is desirable. This study investigates the impact of subsampling on the accuracy of two common metrics, acoustic presence and call rate, for different vocalization patterns (regimes) of baleen whales: (1) variable vocal activity, (2) vocalizations organized in song bouts, and (3) vocal activity with diel patterns. To this end, above metrics are compared for continuous and subsampled data subject to different sampling strategies, covering duty cycles between 50% and 2%. The results show that a reduction of the duty cycle impacts negatively on the accuracy of both acoustic presence and call rate estimates. For a given duty cycle, frequent short listening periods improve accuracy of daily acoustic presence estimates over few long listening periods. Overall, subsampling effects are most pronounced for low and/or temporally clustered vocal activity. These findings illustrate the importance of informed decisions when applying subsampling strategies to passive acoustic recordings or analyses for a given target species.



The article is published open-access and can be downloaded from the following link:
http://scitation.aip.org/content/asa/journal/jasa/138/1/10.1121/1.4922703


For further questions please contact me at Karolin.Thomisch at awi.de<mailto:Karolin.Thomisch at awi.de>.


Best wishes,
Karolin Thomisch


________________________________
Karolin Thomisch
PhD Candidate

Alfred-Wegener-Institut, Helmholz-Zentrum für Polar- und Meeresforschung
Ocean Acoustics Lab
Am Alten Hafen 26
27568 Bremerhaven
GERMANY

Phone:  +49 (471) 4831 1032
Mail:     karolin.thomisch at awi.de
Web:    www.awi.de/acoustics<https://owa.awi.de/owa/redir.aspx?C=1LeeqJTQ6EWrgqGdpCtZI8ZdC9eSGNAIrw8ps8zNFpGLDktrdyRIjisOQXQ6xo-pd09NhICRee0.&URL=http%3a%2f%2fwww.awi.de%2facoustics>
________________________________


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