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Climate Variability and Chum Salmon Production in the North Pacific  

Kim, Su-Am (Department of Marine Biology, Pukyong National University)
Kang, Su-Kyung (Cold-water Inland Fisheries Research Institute, NFRDI)
Seo, Hyun-Ju (Division of Marine Bioresource and Environmental Science, Hokkaido University)
Kim, Eun-Jung (Department of Marine Biology, Pukyong National University)
Kang, Min-Ho (Department of Marine Biology, Pukyong National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.12, no.2, 2007 , pp. 61-72 More about this Journal
Abstract
The relationship between North Pacific chum salmon (Oncorhynchus keta) population and climate variability was investigated in the North Pacific ecosystem. Time-series for the Aleutian Low Pressure, Southern Oscillation, Arctic Oscillation, and Pacific Decadal Oscillation (PDO) indices dating back to 1950 are compared with the chum salmon catch using a cross-correlation function (CCF) and cumulative sum (CuSum) of anomalies. The results of CCF and CuSum analyses indicated that there was a major change in climate during the mid 1970s, and that the chum salmon population responded to this climate event with a time-lag. The PDO and chum salmon returns showed a highly significant correlation with a time-lag of 3 years, while the AOI with a time-lag of $6{\sim}7$ years. The favorable environments for fry chum salmon might cause better growth in the coastal areas, but higher growth rate during the early stage does not seem to be related to the improved return rate of spawning adults. Rather, growth in the Okhotsk Sea or the Bering Sea during immature stages has a significant correlation with return rate, which implies the size-related mortality process. The development of a local climate index is necessary to elucidate the effect of climate variability on the marine ecosystem around the Korean Peninsula.
Keywords
Climate variability; Chum salmon; North Pacific; Pacific Decadal Oscillation (PDO);
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