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Evaluating the consequences of common assumptions in run reconstructions on Pacific-salmon biological status assessments

S. Peacock,Eric Hertz,C. Holt,B. Connors,Cameron Freshwater,K. Connors

Published 2019 in bioRxiv

ABSTRACT

Information on biological status is essential for designing, implementing, and evaluating management strategies and recovery plans for threatened or exploited species. However, the data required to quantify status are often limited, and it is important to understand how assessments of status may be biased by assumptions in data analysis. For Pacific salmon, biological status assessments based on spawner abundances and spawner-recruitment (SR) analyses often involve “run reconstructions” that impute missing spawner data, expand observed spawner abundance to account for unmonitored streams, assign catch to individual stocks, and quantify age-at-return. Using a stochastic simulation approach, we quantified how common assumptions in run reconstructions biased assessments of biological status based on spawner abundance. We found that status assessments were robust to most common assumptions in run reconstructions, even in the face of declining monitoring coverage, but that overestimating catch tended to increase rates of status misclassification. Our results lend confidence to biological status assessments based on spawner abundances and SR analyses, even in the face of incomplete data.

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    bioRxiv

  • Publication date

    2019-12-08

  • Fields of study

    Biology, Environmental Science

  • Identifiers
    DOI 10.1101/868927
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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