National Park Service

Sea Otter Monitoring

Parks monitored: Glacier Bay

Protocol under development - contents subject to change.

  • Program
  • Reports &
  • Original Source Data


Sea Otters

SEAN's long-term sea otter monitoring program is still under development. It is intended to fulfill these objectives:

  • Monitor the abundance and spatial distribution of sea otters in GLBA.
  • Provide a dynamic spatio-temporal model using a flexible statistical framework that can accommodate multiple data types.
  • Implement optimal dynamic survey designs to increase sampling efficiency to maximize program sustainability, increase safety, and improve the precision of parameter estimates.
  • Provide reliable quantitative information regarding the spatial distribution and abundance of sea otters to assess the status of the sea otters in GLBA and to inform Alaska-wide stock assessments by U.S. Fish & Wildlife Service, and inform decisions regarding management actions that may have the potential to impact sea otters.


Williams sea otter detection Williams PJ, Hooten MB, Womble JN, Bower MR. 2017. Estimating occupancy and abundance using aerial images with imperfect detection. Methods Ecol Evol. 00:1–11.

AC Graw Williams PJ, Hooten MB, Womble JN, Esslinger GG, Bower MR, Hefley TJ. 2017. An integrated data model to estimate spatiotemporal occupancy, abundance, and colonization dynamics. Ecology, 98(2), PP. 328-336.

No sea otter monitoring data are currently available.

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