Contributions of adult mortality to declines of Puget Sound Pacific herring

Siple, Margaret C; Shelton, Andrew O; Francis, Tessa B; Lowry, Dayv; Lindquist, Adam P; Essington, Timothy E

doi:10.1093/icesjms/fsx094

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Contributions of adult mortality to declines of Puget Sound Pacific herring

2017
By Siple, Margaret C ; Shelton, Andrew O ; Francis, Tessa B ; ...
Source: ICES Journal of Marine Science, 75(1), 319-329

[PDF-1.02 MB]

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Journal Title:

ICES Journal of Marine Science
Personal Author:

Siple, Margaret C ; Shelton, Andrew O ; Francis, Tessa B ; Lowry, Dayv ; Lindquist, Adam P ; ... More +

Siple, Margaret C ; Shelton, Andrew O ; Francis, Tessa B ; Lowry, Dayv ; Lindquist, Adam P ; Essington, Timothy E Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
Description:

Forage fish undergo dramatic changes in abundance through time. Long-term fluctuations, which have historically been attributed to changes in recruitment, may also be due to changes in adult mortality. Pacific herring, a lightly exploited forage fish in Puget Sound, WA, have exhibited shifts in age structure and decreases in spawning biomass during the past 30 years. Here, we investigate changes in adult mortality as a potential explanation for these shifts. Using a hierarchical, age-structured population model, we indicate that adult natural mortality for Puget Sound Pacific herring has increased since 1973. We find that natural mortality has increased for every age class of adult (age 3+), especially age 4 fish, whose estimated mortality has doubled over the survey time period (from M = 0.84–1.76). We demonstrate that long-term shifts in mortality explain changes in age structure, and may explain biomass declines and failure to reach management thresholds for two spawning sites in Puget Sound (Cherry Point and Squaxin Pass). Temporal shifts in natural adult mortality could have negative implications for herring and herring predators. We demonstrate that adult mortality, in addition to recruitment variation, is an important driver for forage fish, which face exceptionally high natural mortality compared with other fishes.
Keywords:

[+]

Aquatic Science Ecology Ecology, Evolution, Behavior And Systematics Oceanography
Source:

ICES Journal of Marine Science, 75(1), 319-329
DOI:

https://doi.org/10.1093/icesjms/fsx094
ISSN:

1054-3139;1095-9289;
Format:

PDF
Publisher:

Oxford University Press (OUP)
Document Type:

Journal Article
License:

https://creativecommons.org/publicdomain/zero/1.0/
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CC0 Public Domain
Rights Statement:

This work is written by US Government employees and is in the public domain in the US.
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urn:sha256:9354fcf2b44bf61c1a1a2aa003770bda5364791f243f85d5108ad0e08954e492
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https://repository.library.noaa.gov/view/noaa/54702/noaa_54702_DS1.pdf
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Contributions of adult mortality to declines of Puget Sound Pacific herring

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