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Survey of Juvenile Salmon in the Marine Waters of Southeastern Alaska, May-September 2001
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2002
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Series: NMFS-NPAFC Doc. 630
[PDF-3.55 MB]
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Description:Studies of the early marine ecology of Pacific salmon (Oncorhynchus spp.) in Alaska require adequate time series of biophysical data to relate climate fluctuations to the distribution, abundance, and production of salmon. Because salmon are keystone species and constitute important ecological links between marine and terrestrial habitats, fluctuations in the survival of this important living marine resource have broad ecological and socio-economic implications for coastal localities throughout the Pacific Rim. Increasing evidence for relationships between production of Pacific salmon and shifts in climate conditions has renewed interest in processes governing salmon year-class strength (Beamish 1995). In particular, climate variation has been associated with ocean production of salmon during El Niño and La Niña events, such as the recent warming trends that benefitted many wild and hatchery stocks of Alaskan salmon (Wertheimer et al. 2001). However, research is lacking in areas such as the links between salmon production and climate variability, the links between intra- and interspecific competition and carrying capacity, and the links between stock composition and biological interactions. Past research has not provided adequate time-series data to explain such links (Pearcy 1997). Since the numbers of Alaskan salrnonids produced in the region have increased over the last few decades (Wertheimer et al. 2001), mixing between stocks with different life history characteristics has also increased. The consequences of such changes on the growth, survival, distribution, and migratory rates of salrnonids remain unknown.
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Rights Information:Public Domain
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