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  5. At-Sea Aerial Survey Species Observations in Southern California, 1999-2002

At-Sea Aerial Survey Species Observations in Southern California, 1999-2002

Dates

Publication Date
Start Date
1999-05-08
End Date
2002-01-20

Citation

Takekawa, J.Y., Perry, W.M., Adams, Josh, Felis, J.J., Williams, L.L., Yee, J.L., Orthmeyer, D.L., Mason, J.W., McChesney, G.J., McIver, W.R., Carter, H.R., and Golightly, R.T., 2017. At-sea distribution and abundance of seabirds and marine mammals off southern California GIS resource database: Aerial seabird and marine mammal surveys off southern California, 1999–2002: U.S. Geological Survey data release, https://doi.org/10.5066/F7PK0D9P

Summary

Broad survey lines, island radial survey lines, coastal survey lines, and focal-area (Santa Barbara Channel) survey lines were surveyed during each oceanographic season: spring (May), fall (September), and winter (January) during 1999 (May and September), 2000 (January, May, September), 2001 (January May, September), and 2002 (January). Aerial survey methods follow Mason et al. (2007). Specifically, we recorded all sightings of marine animals, vessels, and floating objects from twin-engine, high wing aircraft (Partenavia P-68s, Aspen Helicopters, Oxnard, CA, or California Department of Fish and Game) along pre-determined 100-meter (50 meters per side) strip transects at 60 meters above sea level. Surveys were flown at 160 kilometers [...]

Contacts

Point of Contact :
Josh Adams
Originator :
John Y. Takekawa
Co-Investigator :
Richard Golightly, Harry R. Carter, John W. Mason, Jonathan J. Felis, William M. Perry, Dennis Orthmeyer, William R. McIver, Gerry McChesney
Metadata Contact :
William M Perry
Distributor :
U.S. Geological Survey - ScienceBase

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Shapefile: SoCA_Species_Observations_At_Sea_Surveys_1999_2002.zip
SoCA_Species_Observations_At_Sea_Surveys_1999_2002_FGDC.xml
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SoCA_Species_Observations_At_Sea_Surveys_1999_2002.cpg 5 Bytes
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.dbf 152.55 MB
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.prj 480 Bytes
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.sbn 346.25 KB
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.sbx 10.93 KB
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.shp 958.03 KB
SoCA_Species_Observations_At_Sea_Surveys_1999_2002.shx 273.79 KB

Purpose

Two primary objectives for the initial collection of these data were to (1) conduct aerial at-sea surveys of seabirds and marine mammals in shelf and slope waters off southern California to quantify species and seasonal at-sea densities and (2) conduct a comparison with existing, similar survey datasets off southern California. The purpose of this data release is to provide re-processed versions of these survey data by calculating marine bird densities and mammal counts using user-specified and effort-adjusted spatial binning of species observations along continuous tracklines.

Rights

The authors of these data (USGS and HSU) require that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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