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Estimating cetacean population density using fixed passive acoustic sensors: An example with Blainville’s beaked whales
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Image of FIG. 1.
FIG. 1.

The spatial layout of the AUTEC hydrophones that were recording during the collection of the primary survey data, represented by small crosses. Also shown as dots (perceived as solid lines) are the locations of the tagged Blainville’s beaked whales when each click recorded on the DTag was produced.

Image of FIG. 2.
FIG. 2.

Click counts per minute, summed over the 82 recording hydrophones, for the period of the primary dataset. Time is indexed as minutes since recording started. For operational reasons the data were divided into sets, and some sets (2, 5, 7 and 11) were not used. A standard lowess smooth of click counts over time is shown for the sets used. The small black vertical dashes (“∣”) are scattered minutes within the 8 sets used which were faulty and hence removed from the data. The sample periods used for the estimation of the false positive proportion are represented by “”. The limits of each day and set are represented by dotted and dashed lines, respectively.

Image of FIG. 3.
FIG. 3.

The estimated detection function. Partial plots (on the response scale) of the fitted smooths for a binomial GAM model with slant distance and a 2D smooth of hoa and voa. For the top left plot, the off-axis angles are fixed at 0, 45, and 90° (respectively the solid, dashed, and dotted lines). Remaining plots are two-dimensional representations of the smooths, where black and white represent respectively an estimated probability of detection of 0 and 1. Distance (top right panel) and angle not shown (bottom panels) are fixed respectively at and .


Generic image for table

Details about the tagged whales used in case study analysis: Tag ID, date the animal was tagged, number of dives while animal was tagged, and number of dives with data available for estimating the detection function .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Estimating cetacean population density using fixed passive acoustic sensors: An example with Blainville’s beaked whales