https://doi.org/10.82144/5e19878b https://seamap.env.duke.edu/dataset/1862 https://www.gbif.org/dataset/280f02be-49c4-4dff-9f7f-9515e7b5fb17 https://obis.org/dataset/e7725a54-a90d-4c2a-84da-4bf3b7574e76 Regina Guazzo Naval Information Warfare Center Pacific Primary contact regina.guazzo@gmail.com OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

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seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

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seamap-contact@duke.edu https://seamap.env.duke.edu distributor Regina Guazzo Naval Information Warfare Center Pacific Primary contact regina.guazzo@gmail.com owner 2025-07-31 eng Original provider: Regina A. Guazzo, Scripps Institution of Oceanography Dataset credits: National Oceanic and Atmospheric Administration, Southwest Fisheries Science Center Abstract: During the eastern North Pacific gray whale 2014–2015 southbound migration, acoustic call recordings, infrared blow detections, and visual sightings were combined to estimate cue rates, needed to convert detections into abundance. The gray whale M3 acoustic call rate was 2.3–24 calls/whale/day with an average of 7.5 calls/whale/day over the entire migration (southbound and northbound) and showed a positive trend from 30 December–13 February. The infrared camera blow rate averaged 49 blows/whale/hour over 5–8 January. With a call rate model, we estimated that 4,340 gray whales migrated south before visual observations began on 30 December, which is 2,829 more gray whales than used in the visual abundance estimate. This finding highlights the usefulness of cue rates to increase precision in abundance estimates. We suggest that visual observers increase their survey effort to all of December to verify gray whale abundance corrections. Probability of detection of a whale blow by the infrared camera was the same at night as during the day. However, probability of detection decreased beyond 2.1 km offshore, whereas visual sightings revealed consistent whale densities up to 3 km offshore. We suggest that future infrared camera surveys use multiple cameras optimized for different ranges offshore. Occurrence GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml Marine Biology Visual sighting Marine Animal Survey Marine mammals Visual Sighting Land-based N/A Visual Observation Location: 36 26' 23.61" N 121 55' 20.5" W The sheet labeled "Effort" contains start and end times for observations in both UTC and PST time zones. B indicates the observations were beginning and E indicates the observations were ending. times are in Matlab's datenum format: Days since January 0, 0000 The sheet labeled "Modeled Abundance" contains the estimated number of whales that passed each day. Date is the Julian Date in Matlab's datenum format: Days since January 0, 0000. The estimated number of whales each day are given as a probability distribution. Median and the 95% highest posterior density interval are reported. Methods are described by Durban et al. 2015. The original datasheet is included in the downloadable zipped file. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/1862 Oceans,Granite Canyon,Pacific,Monterey Bay National Marine Sanctuary,California -122.024389 -121.923697 36.46161 36.405439 2014-12-30 2015-02-13 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Eschrichtius robustus Gray whale notPlanned Regina Guazzo Naval Information Warfare Center Pacific Primary contact regina.guazzo@gmail.com NA NA NA Regina Guazzo owner NA zd_1862 2025-07-31T17:27:24-04:00 dataset Guazzo, R. 2019. Gray whale visual sightings from shore 2014-2015. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/5e19878b. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/1862 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1862/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1862/eml OBIS-SEAMAP zd_1862 zd_1862 Guazzo, R. A., Weller, D. W., Europe, H. M., Durban, J. W., D\'Spain, G. L., and Hildebrand, J. A. 2019. Migrating eastern North Pacific gray whale cue rates estimated from acoustic recordings, infrared images, and visual sightings. Scientific Reports: 9, 12617.