Short Communication: Comparing group size estimates of Mediterranean dolphins using visual and passive acoustic data
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Accurately estimating dolphin group size is essential for abundance estimation and population assessment, but it can be challenging using passive acoustic methods. This study compared visual data, assumed to be the gold standard, and passive acoustic data to estimate group size from a double‐platform survey implemented in the vessel component of the ACCOBAMS Survey Initiative in the Mediterranean Sea. Simultaneous data collection resulted in 30 duplicate events, showing no significant correlation between visually and acoustically estimated group sizes. Hence, the number of simultaneous click trains obtained from passive acoustic data may provide different information, as this index is not proportional to the group size recorded with the visual method. Currently, visual estimates remain the most reliable method.
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