Long-term Changes in Length at Maturity of Pacific Salmon in Auke Creek Alaska

Russell, J. R.; Vulstek, Scott C.; Joyce, J. E.; Kovach, R. P.; Tallmon, D. A.

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Long-term Changes in Length at Maturity of Pacific Salmon in Auke Creek Alaska

2018
By Russell, J. R. ; Vulstek, Scott C. ; Joyce, J. E. ; ...
Series: NOAA Technical Memorandum NMFS-AFSC-384

[PDF-709.22 KB]

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Personal Author:

Russell, J. R. ; Vulstek, Scott C. ; Joyce, J. E. ; Kovach, R. P. ; Tallmon, D. A.

Russell, J. R. ; Vulstek, Scott C. ; Joyce, J. E. ; Kovach, R. P. ; Tallmon, D. A. Less -
Corporate Authors:

National Marine Fisheries Service (U.S.) ; Alaska Fisheries Science Center (U.S.)

National Marine Fisheries Service (U.S.) ; Alaska Fisheries Science Center (U.S.) Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) Less -
Description:

Although decreasing length at maturity has been observed in some Alaska salmon populations, the generality of this trend is poorly understood. This study was undertaken to determine whether this pattern holds for multiple species of salmon from a small watershed in Southeast Alaska (Auke Creek), and, if so, what abiotic and biotic factors are contributing to this phenomenon. We analyzed up to 32 years of data (early 1980s - 2012) for coho salmon (Oncorhynchus kisutch), sockeye salmon (O. nerka), and pink salmon (O. gorbuscha). We observed statistically significant decreases in mean length at maturity for coho salmon adults, as well as increases in mean length of saltwater age-2 sockeye salmon. Non-significant trends in mean length were observed in coho salmon jacks, pink salmon, and saltwater age-3 sockeye salmon. Abiotic and biotic variables that explained interannual variation in length include a combination of climate and resource availability effects. These observed changes should be considered in future management decisions to ensure sustainable harvest for Southeast Alaska’s sport, commercial, and subsistence fisheries.
Keywords:

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Biotic Communities Coho Salmon Fisheries Fishery Management Maturity Pacific Salmon Pink Salmon Sockeye Salmon
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NOAA Technical Memorandum NMFS-AFSC-384
Document Type:

Technical Memorandum
Place as Subject:

Auke Creek Alaska
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Public Domain
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Submitted
Main Document Checksum:

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urn:sha256:87cf699c8e7360ec299879846fe12ba11a232a2c7026b3a2315dac12fecb81ab
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https://repository.library.noaa.gov/view/noaa/19391/noaa_19391_DS1.pdf
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Long-term Changes in Length at Maturity of Pacific Salmon in Auke Creek Alaska

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