https://doi.org/10.82144/49d83b75 https://seamap.env.duke.edu/dataset/533 John Hildebrand Scripps Institution of Oceanography, University of California, San Diego Primary contact jhildebrand@ucsd.edu www.cetus.ucsd.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

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seamap-contact@duke.edu https://seamap.env.duke.edu distributor John Hildebrand Scripps Institution of Oceanography, University of California, San Diego Primary contact jhildebrand@ucsd.edu www.cetus.ucsd.edu owner 2025-07-31 eng Original provider: John Hildebrand Dataset credits: These data were analyzed by Melissa Soldevilla. This research project was funded by F. Stone and E. Young through CNO-N45. Abstract: High-frequency Acoustic Recording Packages (HARPs) were deployed at six locations in the Southern California Bight between August 2005 and January 2008 to examine diel, seasonal, and annual patterns of occurrence and distribution. Long term spectral averages (LTSAs) were examined by eye for the presence of echolocation click bouts from Risso's dolphins and Pacific white-sided dolphins. Click bouts were identified to species by a trained analyst based on their spectral characteristics (described in Soldevilla et al 2008). Observations represent presence in one-hour time bins (#obs) and are quantified as the number of one-minute time bins with clicks present. Two click types, A and B, were identified for Pacific white-sided dolphins, which show spatial and temporal segregation in occurrence. HARP recording schedules varied across deployments and include continuous recording, 1/2, 1/3, and 1/4 duty cycles in which 5 minutes were recorded followed by 5, 10, and 15 minutes off, respectively. Effort data is also available in one-hour time bins and includes the number of minutes with recording effort per hour. Marine Biology Passive acoustic detection Ocean-based Platforms Acoustic calls N/A Times are in GMT. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/533 Oceans,Southern California Bight -120.7999229 -118.2517615 34.3135813 32.6501767 2005-08-14 2008-01-02 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Grampus griseus Risso's dolphin species Lagenorhynchus obliquidens Pacific white-sided dolphin The goal of this work was to monitor occurrence of acoustically active cetaceans in the Southern California Bight and develop predictive models of habitat. The data presented here are based on echolocation clicks of Risso's dolphins and Pacific white-sided dolphins. notPlanned John Hildebrand Scripps Institution of Oceanography, University of California, San Diego Primary contact jhildebrand@ucsd.edu www.cetus.ucsd.edu NA NA NA John Hildebrand owner NA zd_533 2025-07-31T14:19:27-04:00 dataset Hildebrand, J. 2011. SIO Southern California HARPs Acoustic Dolphin Detections 2005-2007. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/49d83b75. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/533 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/533/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/533/eml OBIS-SEAMAP zd_533 zd_533 Soldevilla, M.S., Ferguson, M.C., Oleson, E.O., Wiggins, S.M., and Hildebrand, J.A. 2011. Risso's and Pacific white-sided dolphin habitat modeling from passive acoustic monitoring. Marine Ecology Progress Series: 423: 247-260.