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Modeling vital rates and age-sex structure of Pacific arctic phocids: influence on aerial survey correction factors

Paul B. Conn, Irina S. Trukhanova
doi: https://doi.org/10.1101/2022.04.12.487942
Paul B. Conn
1NOAA, NMFS, Alaska Fisheries Science Center, Marine Mammal Laboratory, Seattle, Washington
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  • For correspondence: paul.conn@noaa.gov
Irina S. Trukhanova
2North Pacific Wildlife Consulting, LLC, Seattle, Washington, United States of America
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Abstract

To estimate abundance, surveys of marine mammals often rely on samples of satellite-tagged individuals to correct counts for the proportion of animals that are unavailable to be detected. However, naïve application of this correction relies on the key assumption that availability of the tagged sample resembles that of the population. Here, we show how matrix population models can be used to estimate the stable stage structure of bearded seals (Erignathus barbatus), ribbon seals (Histriophoca fasciata), ringed seals (Pusa hispida), and spotted seals (Phoca largha) in the Bering and Chukchi Seas, and how these proportions can be used to adjust aerial survey correction factors so that they represent population-level availability. We find that correction factors ignoring age-sex composition can positively bias spotted seal abundance by an average of 13% and negatively bias ribbon seal abundance by an average of 5%. Note that we did not examine potential bias for bearded or ringed seals due to low sample sizes; as such, we urge caution in interpretation of abundance estimates for these species.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://github.com/pconn/StableStagePhocid

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. This article is a US Government work. It is not subject to copyright under 17 USC 105 and is also made available for use under a CC0 license.
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Posted April 13, 2022.
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Modeling vital rates and age-sex structure of Pacific arctic phocids: influence on aerial survey correction factors
Paul B. Conn, Irina S. Trukhanova
bioRxiv 2022.04.12.487942; doi: https://doi.org/10.1101/2022.04.12.487942
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Modeling vital rates and age-sex structure of Pacific arctic phocids: influence on aerial survey correction factors
Paul B. Conn, Irina S. Trukhanova
bioRxiv 2022.04.12.487942; doi: https://doi.org/10.1101/2022.04.12.487942

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