Plot of southern sea otter population trends
Detailed Description
Plot of southern sea otter population trends along the mainland coast of California and at San Nicolas Island over the period 1990–2013. Trend lines for the mainland (left vertical axis) are shown as “3-year running averages” of independents (dashed green line) and total otters (solid blue line). For example, the 3-year average of total otters for 1998 is the average of the total counts for 1996, 1997, and 1998. For San Nicolas Island (right vertical axis, note scale difference) the trend line (lowest line, in red) represents the annual high counts. The range-wide index of abundance (left vertical axis) is also shown for 2013.
Sources/Usage
Public Domain.
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California Sea Otter Surveys and Research
WERC collaborates with other research scientists to conduct annual population surveys of the southern sea otter -- a federally listed threatened species. In coordination with the California Department of Fish and Game and other institutions, ongoing surveys and research continues to inform the southern sea otter recovery plan for the U.S. Fish and Wildlife Service, and contributes to our...
Related Content
California Sea Otter Surveys and Research
WERC collaborates with other research scientists to conduct annual population surveys of the southern sea otter -- a federally listed threatened species. In coordination with the California Department of Fish and Game and other institutions, ongoing surveys and research continues to inform the southern sea otter recovery plan for the U.S. Fish and Wildlife Service, and contributes to our...