Data from: Harbour porpoises respond to small boats by speeding up and moving away ...
Recreational boats are common in many coastal waters, yet their effects on cetaceans and other sensitive marine species remain poorly understood. To address this knowledge gap, we used drone videos to quantify how harbour porpoises (Phocoena phocoena) responded to a small motorboat approaching at di...
| Main Authors: | , , , , , , |
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| Format: | Dataset |
| Language: | English |
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Dryad
2024
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5061/dryad.q83bk3jq8 https://datadryad.org/stash/dataset/doi:10.5061/dryad.q83bk3jq8 |
| Summary: | Recreational boats are common in many coastal waters, yet their effects on cetaceans and other sensitive marine species remain poorly understood. To address this knowledge gap, we used drone videos to quantify how harbour porpoises (Phocoena phocoena) responded to a small motorboat approaching at different speeds (10 or 20 knots). The experiment was carried out in shallow waters near Funen, Denmark (55.51° N, 10.79° E) between July and September 2022. Porpoises moved further away from the boat path during approaches at both boat speeds. In addition, porpoises swam faster when approached at 20 knots but not when approached at 10 knots, and they had a higher likelihood of moving away from the boat path when approached at 10 knots but not at 20 knots. Importantly, the received sound level did not depend on how fast the boat approached, suggesting that differences in porpoise responses were related to the speed of the boat's approach rather than to sound itself. The porpoises' behaviour during the minute where ... : # Data from: Harbour porpoises respond to small boats by speeding up and moving away [https://doi.org/10.5061/dryad.q83bk3jq8](https://doi.org/10.5061/dryad.q83bk3jq8) The dataset comprises seven files: two raw data files in CSV format (‘PorpBoatData.csv’ and ‘BoatNoise.csv’), and five R script files (‘1PorpResponseToBoatApproach.R’, ‘2PorpResponseToExpPhases.R’, ‘3PorpResumeBehaviour.R’, ‘4BoatNoiseLevels.R’ and ‘5FuncCalAvoidance.R’) for conducting data analysis and plotting. ## Description of the data and file structure **'PorpBoatData.csv'** file contains information on porpoise data extracted from drone videos and boat locations recorded by portable GPS during experiments. This dataset is structured with 16 columns, including: ‘Time’: timestamps of each data point, ‘Trial_speed’: boat speed, either 10 or 20 knots, ‘Exp_stage’: specifying the experiment phases, i.e. pre_disturb, disturb, and post_disturb ‘Porp_x’ and ‘Porp_y’: porpoise locations in UTM 32 N coodinate system at each timestamp ... |
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