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Annual California Sea Otter Census: 2016 Census Summary Shapefile

Dates

Publication Date
Start Date
2016-04-17
End Date
2016-05-11

Citation

Tinker, M.T., and Hatfield, B.B., 2016, Annual California Sea Otter Census - 2016 Spring Census Summary: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F7FJ2DWJ.

Summary

The GIS shapefile "Census summary of southern sea otter 2016" provides a standardized tool for examining spatial patterns in abundance and demographic trends of the southern sea otter (Enhydra lutris nereis), based on data collected during the spring 2016 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. This Shape file includes a series of summary statistics derived from the raw census data, including [...]

Contacts

Point of Contact :
M. Tim Tinker
Originator :
M. Tim Tinker, Brian B Hatfield
metadata contact :
William M Perry
Distributor :
U.S. Geological Survey - ScienceBase

Attached Files

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Shapefile: Census summary of southern sea otter 2016.zip
Census summary of southern sea otter 2016_FGDC.xml
Original FGDC Metadata

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29.77 KB
Census summary of southern sea otter 2016.dbf 945.52 KB
Census summary of southern sea otter 2016.shp 646.4 KB
Census summary of southern sea otter 2016.shx 15.62 KB
Census summary of southern sea otter 2016.CPG 5 Bytes
Census summary of southern sea otter 2016.prj 468 Bytes
Census summary of southern sea otter 2016.sbn 17.8 KB
Census summary of southern sea otter 2016.sbx 540 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. The 3-year running average of the spring counts have been identified as the best index of trends and status of the population, because these averages decrease the influence of year-to-year sampling variance. The 3-year average counts are used by the US Fish and Wildlife Service in its listing determinations (de-listing or up-listing) for this legally threatened population.

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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Communities

  • USGS Western Ecological Research Center

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Additional Information

Shapefile Extension

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