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Project Information

Title: A Population Model for Sea Otters in Western PWS

Project Year and Number: 1993: 93043

Other Fiscal Years and Numbers for this Project: 1993: 93043-2

Principal Investigator (PI): Mark Udevitz, US Geological Survey

Assisting Personnel: Brenda Ballachey, Dana Bruden

Research Location: Prince William Sound

Restoration Category: Monitoring

Injured Resources Addressed: Sea Otters

Abstract: Immediate sea otter losses associated with the EVOS probably ranged from 3,000 to 5,000 animals. Sampling of sediments and sea otter prey items indicates that the exposure of otters to petroleum hydrocarbons may be continuing, affecting the survival and therefore the recovery of the population.

As a continuation of work conducted in 1991 and 1992, this project will conduct population surveys of sea otters in the Prince William Sound using aerial surveying. Due to the identification of bias resulting in the boat surveys, aerial survey method began to be developed in 1991. A Global Positioning System (GPS) was used in the aircraft to locate the endpoints of each transect. Concentric circles within the width of the survey transect were flown, and data was collected.

Continued survey development includes the investigation of two methods for increasing the sample size of intensive search units. Prince William Sound will be partitioned into 400 km-wide strip transects divided into 2 strata, feeding and non-feeding habitat. Data collected using aerial survey will be entered into a database.

Mortality patterns will be evaluated through the recovery of sea otter carcasses surveyed on beaches in Prince William Sound. A Leslie matrix model for males and females will be constructed to model the sea otter population to predict recovery. Habitat use patterns will be analyzed.


Keywords

Geographic Regions Prince William Sound
Species Marine Mammals - Sea Otters
Fields of Expertise Ecology

Proposal: PDF Not Available

Funding Recommendations: View

Funding Detail For: 1993

Quarterly Project Tasks For: 1993

Annual Report: 1993: Not Applicable

Final Report: View

Publications from this Project: None Available

More information may be available for this project under other years:

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Project Number Proposal Annual Reports Final Report Data
1993: 93043-2 Not Available 1993: Not Applicable
View See Project 93043