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2015 Range Extent Shapefile

Dates

Publication Date

Citation

Tinker, M.T., and Hatfield, B.B., 2015, Southwest U.S. Southern sea otter annual range-wide census results: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F7F47M5C

Summary

The GIS layer "Range_extent_15" 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 2015 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 stretching along the coast of [...]

Contacts

Principal Investigator :
M. Tim Tinker
Distributor :
U.S. Geological Survey - ScienceBase
Metadata Contact :
William M Perry

Attached Files

Click on title to download individual files attached to this item.

Range_Extent_15_FGDC.xml
Original FGDC Metadata

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17.94 KB
Shapefile: Range_Extent_15.zip
Range_Extent_15.shp 15.64 KB
Range_Extent_15.dbf 73 Bytes
Range_Extent_15.shx 108 Bytes
Range_Extent_15.prj 468 Bytes
Range_Extent_15.sbn 132 Bytes
Range_Extent_15.sbx 116 Bytes
Range_Extent_15.cpg 5 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.

Map

Spatial Services

ScienceBase WMS

ScienceBase WFS

Communities

  • USGS Western Ecological Research Center

Tags

Provenance

Data source
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Additional Information

Shapefile Extension

boundingBox
minY34.418157191773965
minX-122.37337670778538
maxY37.19620667185031
maxX-120.2787047331749
nameRange_Extent_15
files
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contentTypex-gis/x-shapefile
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size16012
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.dbf
contentTypeapplication/unknown
pathOnDisk__disk__eb/0c/30/eb0c309a007c8316776f747ee79f2c059a970caf
size73
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.shx
contentTypex-gis/x-shapefile
pathOnDisk__disk__9c/df/03/9cdf0310ba4f4c242aded685a8cc667f9874f566
size108
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.prj
contentTypetext/plain
pathOnDisk__disk__dc/d8/ef/dcd8efa89e6b4cf7bf897fce09aafc9cf9eb241a
size468
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.sbn
contentTypex-gis/x-shapefile
pathOnDisk__disk__de/63/26/de63266f4f650f7a4a687e2b4c011507dfb9a5de
size132
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.sbx
contentTypex-gis/x-shapefile
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size116
dateUploadedTue Sep 01 15:07:06 MDT 2015
nameRange_Extent_15.cpg
contentTypetext/plain
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size5
dateUploadedTue Sep 01 15:07:06 MDT 2015
nativeCrsEPSG:3310
geometryTypeMultiLineString

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