[MARMAM] New publication on C-POD dolphin detection validation

Aran Garrod aran.garrod at googlemail.com
Thu Sep 20 21:44:00 PDT 2018

My co-authors and I are pleased to announce the publication of the paper

Garrod, A., Fandel, A.D., Wingfield, J.E., Fouda, L., Rice, A.N., 
Bailey, H. 2018. Validating automated click detector dolphin detection 
rates and investigating factors affecting performance. The Journal of 
the Acoustical Society of America, https://doi.org/10.1121/1.5049802.


Passive acoustic monitoring (PAM) is a widely used technique for 
studying the distribution and habitat use of cetaceans. The C-POD, an 
acoustic sensor with an onboard automated click detector, has been 
deployed in diverse acoustic environments, but studies verifying its 
offshore detection rates and factors affecting detection probability are 
scarce. To empirically evaluate the performance of C-PODs in detecting 
bottlenose dolphins (/Tursiops truncatus/), C-PODs were deployed 
alongside archival acoustic recorders 12–30 km offshore in the Northwest 
Atlantic Ocean. The C-POD and acoustic recordings, post-processed using 
PAMGUARD software, were compared for a period of 6852 h. C-POD false 
positive rates were very low (mean 0.003%), and positive hourly 
detection accuracy was very high (mean 99.6%). Analysis of the acoustic 
environment and dolphin click characteristics revealed that true 
positive detections by C-PODs were significantly more likely to occur 
when PAMGUARD detected more clicks and there was increased high 
frequency noise (>20 kHz), likely from distant or unclassified clicks. 
C-PODs were found to be reliable indicators of dolphin presence at 
hourly or greater time scales. These results support the application of 
C-PODs in PAM studies that aim to investigate patterns of dolphin 
occurrence, such as those related to offshore windfarms.

The paper can be found here:


Aran Garrod

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