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Annual California Sea Otter Census: 2018 Extra Limit Observations Shapefile

Dates

Publication Date
Start Date
2018-04-26
End Date
2018-05-24

Citation

Hatfield, B.B., Yee, J.L., Kenner, M.C., Tomoleoni, J.A., and Tinker, M.T., 2018, Annual California sea otter census—2018 spring census summary: U.S. Geological Survey data release, https://doi.org/10.5066/P98012HE.

Summary

The GIS shapefile "Extra limit counts of southern sea otters 2018" is a point layer representing the locations of sea otter sightings that fall outside the officially recognized range of the southern sea otter (Enhydra lutris nereis) in mainland California. These data were collected during the spring 2018 range-wide census. The USGS range-wide sea otter census has been undertaken each year since 1982, using consistent methodology involving both ground-based and aerial-based counts. The spring census provides the primary basis for gauging population trends by State and Federal management agencies. Sea otter distribution in California (the mainland range) is considered to comprise a band of potential habitat stretching along the coast [...]

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Attached Files

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Shapefile: Extra_limit_counts_of_southern_sea_otter_2018.zip
Extra_limit_counts_of_southern_sea_otter_2018.sbn 148 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.sbx 116 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.shp 128 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.shx 108 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.cpg 5 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.dbf 369 Bytes
Extra_limit_counts_of_southern_sea_otter_2018.prj 442 Bytes

Purpose

The range-wide census is conducted to monitor trends in abundance of the southern sea otter, and thus provide State and Federal resource agencies with the information they need for effective management. Because the censuses represent uncorrected total counts (rather than sample-based surveys), they cannot be considered as accurate estimates of true population abundance. Instead, these data represent a valuable time-series of index counts, and provide the means of assessing spatial and temporal trends in relative abundance and distribution.

Map

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ScienceBase WMS

ScienceBase WFS

Communities

  • USGS Western Ecological Research Center

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Additional Information

Shapefile Extension

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