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Annual California Sea Otter Census - 1985-2014 Spring Census Summary

Dates

Publication Date
Start Date
1985
End Date
2014

Citation

Tinker, M.T., and Hatfield, B.B., 2018, Annual California sea otter census—1985-2014 spring census summary: U.S. Geological Survey data release, https://doi.org/10.5066/F7445JQ5.

Summary

This dataset represents an archived record of annual California sea otter surveys from 1985-2014. Survey procedures involve counting animals during the "spring survey" -- generally beginning in late April or early May and usually ending in late May early June but may extend into early July, depending on weather conditions. Annual surveys are organized by survey year and within each year, three shapefiles are included: census summary of southern sea otter, extra limit counts of southern sea otter, and range extent of southern sea otter. The surveys, conducted cooperatively by scientists of the U.S. Geological Survey, California Department of Fish and Wildlife, U.S. Fish and Wildlife Service and Monterey Bay Aquarium with the help of [...]

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Attached Files

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Spring1985_SeaOtterCensus.zip 560.49 KB application/zip
Spring1986_SeaOtterCensus.zip 552.6 KB application/zip
Spring1987_SeaOtterCensus.zip 542.04 KB application/zip
Spring1988_SeaOtterCensus.zip 573.35 KB application/zip
Spring1989_SeaOtterCensus.zip 590.99 KB application/zip
Spring1990_SeaOtterCensus.zip 604.17 KB application/zip
Spring1991_SeaOtterCensus.zip 649.82 KB application/zip
Spring1992_SeaOtterCensus.zip 648.83 KB application/zip
Spring1993_SeaOtterCensus.zip 653.14 KB application/zip
Spring1994_SeaOtterCensus.zip 652.84 KB application/zip
Spring1995_SeaOtterCensus.zip 653.57 KB application/zip
Spring1996_SeaOtterCensus.zip 654.38 KB application/zip
Spring1997_SeaOtterCensus.zip 654.77 KB application/zip
Spring1998_SeaOtterCensus.zip 654.61 KB application/zip
Spring1999_SeaOtterCensus.zip 763.44 KB application/zip
Spring2000_SeaOtterCensus.zip 765.53 KB application/zip
Spring2001_SeaOtterCensus.zip 764.89 KB application/zip
Spring2002_SeaOtterCensus.zip 724.24 KB application/zip
Spring2003_SeaOtterCensus.zip 709.68 KB application/zip
Spring2004_SeaOtterCensus.zip 718.07 KB application/zip
Spring2005_SeaOtterCensus.zip 725.47 KB application/zip
Spring2006_SeaOtterCensus.zip 725.13 KB application/zip
Spring2007_SeaOtterCensus.zip 740.57 KB application/zip
Spring2008_SeaOtterCensus.zip 817.15 KB application/zip
Spring2009_SeaOtterCensus.zip 824.31 KB application/zip
Spring2010_SeaOtterCensus.zip 746.46 KB application/zip
Spring2012_SeaOtterCensus.zip 742.86 KB application/zip
Spring2013_SeaOtterCensus.zip 736.22 KB application/zip
Spring2014_SeaOtterCensus.zip 740.08 KB application/zip
AnnualCaliforniaSeaOtter_Census_summary_1985_2014.csv 11.44 MB text/csv

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 Data Release Products
  • USGS Western Ecological Research Center

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/F7445JQ5

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