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Developing methods to use static acoustic click detectors for long term monitoring of coastal delphinids along the Cape south coast, South Africa

Cetaceans are not the only animals that produce sound underwater and interference from a number of other underwater sources is a challenge that scientists have to deal with in all forms of acoustic monitoring. Data collected from two different deployment locations (referred to as „Before‟ and „After‟) in Mossel Bay, South Africa were compared after considerable interference from other noise sources was detected at the first site. Mean recording time lost for all deployments decreased significantly from 26.37 minutes per hour during the „Before‟ period (95% CI: 25.66 27.08) to 0.69 minutes (95% CI: 0.57 – 0.81) per hour during the „After‟ period. Mean number of cetacean clicks detected before moving increased from only 6463.33 (95% CI: 6133.31 6793.36) per deployment to 97820 (95% CI: 61829.58 133809.8) per deployment after moving. Mean detection positive minutes also increased from 0.23 minutes per hour per day per deployment (95% CI: 0.06 0.53) to 2.79 minutes (95% CI: 1.54 – 4.04) per hour per day per deployment. These results illustrated the considerable effect that marine background noise (both biological and anthropogenic) can have on the ability of the C-POD to detect cetaceans. The location of a C-POD deployment needs to be selected carefully in order to minimize the effect of background noise ensuring the C-POD functions optimally. Moving the C-POD into deeper waters reduced the amount of background noise that often occurs in shallow waters however this is not always possible when studying near-shore species.