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Bird density and marine mammal counts based on 3000 meter bins 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

Tracklines and associated observations were mapped and analyzed using ArcMap (ESRI, Redlands, CA). GPS data were recorded in NAD27 map datum and projected to an USGS Albers Equal Area Conic map projection for presentation and subsequent density analyses. Concatenated GPS and observation data were then used to generate point and line coverages in ArcMap (ESRI, Redlands, CA). We designed a custom analytic tool using ArcMap Model Builder that allows for the construction and export of user-specified and effort-adjusted spatial binning of species observations along continuous trackines. For the purposes of this report, we calculated seabird density estimates and marine mammal counts along continuous 3.0-kilometer and 7.7-kilometer trackline [...]

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Shapefile: SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.zip
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.cpg 5 Bytes
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.dbf 54.39 MB
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.prj 480 Bytes
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.sbn 185.39 KB
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.sbx 8.07 KB
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.shp 11.96 MB
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002.shx 146.6 KB
SoCA_Bins_3000m_BirdDensity_MammalCounts_1999_2002_FGDC.xml
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64.14 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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  • USGS Western Ecological Research Center

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