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• W2092345911 abstract "Monitoring the dynamics and status of populations of harbor seals (Phoca vitulina richardii) requires efficient methods for estimating population parameters from mark-resight data. We used a test set of photographs from 182 individuals identified by flipper tags, scars, or unique pelage markings to test whether individuals could be identified accurately by their ventral pelage markings; to document efficiency and misidentification error rate associated with a computer-assisted photograph-matching system; and to test for bias in mark-recapture survival estimates resulting from misidentification errors. Pelage patterns of seals that were not of dark-intermediate or intermediate color phase were unique and stable from birth until 6–8 years, and from year to year as adults. The computer-assisted system greatly improved efficiency of photograph matching: 93.3% of good photographs and 69.9% of all photographs ranked 1st, and 95.2% of good photographs ranked in the top 0.3% of the ordered list for visual checking. Additional visual matching error averaged <3.0% for good photographs, and overall misidentification error rate was low at 1.8%, due to the availability of multiple photographs for matching. Inclusion of poor-quality photographs reduced ranking success by ∼20% and increased additional visual matching error up to 20%. Bias in survival estimates was –7.0% for a misidentification rate of 8.8%, but was ≤ 1.1 % for misidentification rates of <2.7%, achieved by restricting data to only good photos. Our study suggests that estimation of misidentification error rate, inclusion of only high-quality photographs, or use of models that account for misidentification error, are required to prevent bias in mark-recapture survival estimates when using data from natural-marking studies." @default.
• W2092345911 created "2016-06-24" @default.
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• W2092345911 date "2008-10-01" @default.
• W2092345911 modified "2023-10-18" @default.
• W2092345911 title "Evaluation of a Computer-assisted Photograph-matching System to Monitor Naturally Marked Harbor Seals at Tugidak Island, Alaska" @default.
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• W2092345911 doi "https://doi.org/10.1644/07-mamm-a-151.1" @default.
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