By
Anne B. Hollowed1, Steven R. Hare2, Michiyo Shima3 and Warren S. Wooster4
1. Alaska Fisheries Science Center
7600 Sand Point Way NE
Seattle, WA 98115
2. International Pacific Halibut Commission
P. O. Box 95009
Seattle, WA 98145-2009
3. School of Fisheries
University of Washington
Seattle, WA 98115
4. School of Marine Affairs
University of Washington
Seattle, Washington 98115
Review of oceanographic and climate data from the North Pacific and
Bering Sea
revealed events that occur on three principal time scales: a) 1-5 years
(El Nino
Southern Oscillation and interannual variation), b) 6-12 years (decadal
scale
variability), and c) 30 years (Pacific decadal oscillation, PDO).
The start and
end date these events was examined on a latitudinal basis. We
examined time
series commercial fishery recruitment data for evidence of coherence
with one or
more of the time scales noted in oceanographic and climate data.
Our analysis
revealed that time series of marine fish recruitment can be classified
on the
basis of the timing of oceanographic and climate events. We examine
the role of
oceanographic forcing in determining marine fish production and the
ecological
balance of species within the system. Specifically we examine
the role of the
ôstorage effectö and longevity in minimum spawner biomass
levels.
Outline: 30 minutes
1. Introduction: Climate/Storage Effect.
2. Ocean variability: Interannual, decadal, PDO
3. Timing of events by region
4. Time series of recruitment
5. Classification
6. relationship between longevity, productivity and classification
7. Evidence for storage effect
8. Conclusions
Lag-1 Autocorrelations for U.S. West Coast and Alaska groundfish and salmon
Summary of Intervention Analysis
Office 97 Excel spreadsheet containing the above tables and figures
Comparison of ENSO and PDO (Powerpoint file)
Map showing 2 degree COADS squares (the squares with dots correspond to the temperature anoms in the next plot. Dot 1 is the southernmost while dot 34 is the northernmost).
Time-latitude
plot of sstanoms from January 1950 (month 1 on time scale) to January
1998 (month 577)
A
two way table classifying years of El Nino/La Nina and pos. PDO/neg. PDO
