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Annual California Sea Otter Census: 2017 Range Extent Shapefile

Dates

Publication Date
Start Date
2017-04-30
End Date
2017-07-12

Citation

Tinker, M.T., and Hatfield, B.B., 2017, Annual California sea otter census—2017 spring census summary: U.S. Geological Survey data release, https://doi.org/10.5066/F7R2109J.

Summary

The GIS shapefile "Range extent of southern sea otters 2017" is a simple polyline representing the geographic distribution of the southern sea otter (Enhydra lutris nereis) in mainland California, based on data collected during the spring 2017 range-wide census. The USGS range-wide sea otter census has been undertaken twice a year since 1982, once in May and once in October, using consistent methodology involving both ground-based and aerial-based counts. The spring census is considered more accurate than the fall count, and 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 [...]

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Shapefile: Range Extent of southern sea otters 2017.zip
Range Extent of southern sea otters 2017_FGDC.xml
Original FGDC Metadata

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23.42 KB
Range Extent of southern sea otters 2017.CPG 5 Bytes
Range Extent of southern sea otters 2017.dbf 73 Bytes
Range Extent of southern sea otters 2017.prj 468 Bytes
Range Extent of southern sea otters 2017.sbn 132 Bytes
Range Extent of southern sea otters 2017.sbx 116 Bytes
Range Extent of southern sea otters 2017.shp 15.65 KB
Range Extent of southern sea otters 2017.shx 108 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. The range extent GIS layer is useful for evaluating the range expansion of the sea otter population over time, and for identifying areas where significant sea otter impacts on near-shore marine communities are likely to occur.

Rights

The authors of these data 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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Additional Information

Shapefile Extension

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