Acceleration and depth data on foraging behaviour of rhinoceros auklets breeding at Teuri Island

Marine top predators are expected to adjust their foraging behaviour at multiple time scales concomitantly with changes in forage fish availability. Rhinoceros auklets Cerorhinca monocerata rearing chicks at Teuri Island, Japan Sea, fed on anchovy Engraulis japonicus in 2012 and 2013 (anchovy regime) but switched to sand lance Ammodytes spp in 2019 and 2020 (sand lance regime). Here, we studied their at-sea behaviour using the GPS locations of 33 birds and the depth-acceleration records of 26 birds, and compared their foraging behaviour between these prey regimes. At the trip scale, auklets used offshore waters (>50 m sea depth) and coastal waters in the anchovy regime but used mainland coastal waters (<50 m sea depth) in the sand lance regime. In the sand lance regime, the birds also conducted more overnight 2- to 4-day trips in 2020 and spent more time flying during 1-day trips as they fed in further areas compared to the anchovy regime. At the dive scale, auklets frequently dov..., We deployed the depth-acceleration data-logger (ORI400-D3GT, 9.0 g, 12 mm diameter×51 mm, Little Leonardo, Japan) on the back of  Rhinoceros Auklets rearing chicks at Teuri Island. The sampling interval was 1 second for depth and  0.02 s (50 Hz) or 0.05 s (20 Hz) for 3-axis acceleration; sway (X, left-right), surge (Y, tail-head), and heave (Z, dorso-ventral). We retrieved depth-acceleration loggers from 8 of 8 birds in 2012, 8 of 8 birds in 2013, 10 of 11 birds in 2019, and 8 of 8 birds in 2020. Because of malfunction or battery shortage in some devices, we finally collected depth-acceleration data from 26 birds. Here are the Igor files. You can see data and calculation processes using Igor software.
We defined dives as depth greater than 1m considering the accuracy of the depth sensor (0.5m), “dive duration” as the time between the previous time the bird first attained 1 m and the following time it last attained 1m, “dive depth” as the maximum depth during each dive, and “surface time...,  IGOR Pro ver. 8.03 (WaveMetrics, Lake Oswego, USA) for the .pxp files. Txt files are provided for accessibility., # Acceleration and depth data on foraging behaviour of rhinoceros auklets breeding at Teuri Island

[Access this dataset on Dryad](https://doi.org/10.5061/dryad.7sqv9s4x8∴)

Bird List and time of start recording data for each logger is in D3GTStartTime Excel file. See Supplementary Material 1 for detailed information for each bird.

## Description of the data and file structure

We deployed the depth-acceleration data-logger (ORI400-D3GT, 9.0 g, 12 mm diameter×51 mm, Little Leonardo, Japan) on the back of  Rhinoceros Auklets rearing chicks at Teuri Island. Igor files for Depth, temperature and 3-axis acceleration data collected by D3GT logger deployed on Rhinoceros Auklets at Teuri Island. File name is Year_data-logger_sampling interval and Bird ID. Sampling interval was 1 second for depth (Depth) and in interval of 0.02 s or 0.05 s for 3-axis acceleration; sway (XW, left-right), surge (YW, tail-head), and heave (ZW, dorso-ventral). We retrieved depth-acceleration loggers from 8 of 8 bi...