Data from: Harbour porpoise responses to pile-driving diminish over time ...

• Main Authors: Graham, Isla M., Merchant, Nathan D., Farcas, Adrian, Barton, Tim R., Cheney, Barbara, Bono, Saliza, Thompson, Paul M.
• Format: Dataset
• Language: English
• Published: Dryad 2019
• Subjects: behavioural response; acoustic disturbance; Phocoena phocoena; environmental risk assessment; Marine mammal conservation; Harbour porpoise
• Online Access: https://dx.doi.org/10.5061/dryad.5qg30sd; https://datadryad.org/stash/dataset/doi:10.5061/dryad.5qg30sd

Estimating impacts of offshore windfarm construction on marine mammals requires data on displacement in relation to different noise levels and sources. Using echolocation detectors and noise recorders, we investigated harbour porpoise behavioural responses to piling noise during the 10-month foundation installation of a North Sea windfarm. Current UK guidance assumes total displacement within 26 km of pile driving. In contrast, we recorded a 50 % probability of response within 7.4 km (95 % CI = 5.7 – 9.4) at the first location piled, decreasing to 1.3 km (95 % CI = 0.2 – 2.8) by the final location; representing 28 % (95 % CI = 21 – 35) and 18 % (95 % CI = 13 – 23) displacement of individuals within 26 km. Distance proved as good a predictor of responses as audiogram weighted received levels, presenting a more practicable variable for environmental assessments. Critically, acoustic deterrent device (ADD) use and vessel activity increased response levels. Policy and management to minimise impacts of renewables ... : Readme.txt file for data packages associated with paper on “Harbour porpoise responses to pile-driving diminish over time”Description of data packagesGraham_BOWL_cMMMP_Data_Packages_Readme_2019-05-01.txtR code to prepare porpoise responses & construction activity dataR code to prepare the data file for analyses of porpoise responses to pile-driving, acoustic deterrent device (ADD) use and vessel activity. Filename = "Graham_BOWL_cMMMP_R_code_to_prepare_porpoise_response_data_2019-01-18.R"Graham_BOWL_cMMMP_R_code_to_prepare_porpoise_response_data_2019-05-01.RZip folder with 100 data files on porpoise occurrenceZip folder with 100 CPOD data files on porpoise occurrence for analyses of responses of porpoises to construction activity. Filename = "Graham_BOWL_cMMMP_CPOD_porpoise_ClickCounts_data_2019-01-18.zip” Each file has the data from a single CPOD deployment, cropped to remove data up to 23:59 on the day of deployment and from 00:00 on the day of retrieval. Each file has five columns = File, ChunkEnd, ...