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In the Bering Sea • Pseudo-Nitschia Spp

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In the Bering Sea • Pseudo-Nitschia Spp The Status of North Pacific Marine Ecosystems -- Synthesis DRAFT chapters currently available at: www.pices.int\outgoing\npesr Synthesis prepared by the NPESR Working Group plus Chapter Lead Authors at a workshop held in Victoria, August 2003: Ian Perry Harold Batchelder Yukimasa Ishida Makoto Kashiwai Kuh Kim Skip McKinnell Vladimir Radchenko John Stein Chapter Lead Authors (bold) and Participants Steven Bograd Alexander Bychkov Elena Dulepova Douglas Eggers Steven Hare Xian-Shi Jin Suam Kim Patricia Livingston Salvador Lluch-Cota David Mackas Bernard Megrey Franz Mueter Philip Mundy James Overland Satoshi Sugimoto Sinjae Yoo Climate • positive phase of PDO from Monthly PDO 1977 to 1999 (with 1989 uncertain) • change to negative phase in 1999, but apparent return to positive phase in 2003 • An index derived from sea surface height (less variable than the PDO) shows the 1999 shift but not the 2003 change TOPEX/POSEIDON Sea Surface Height Index (green); PDO (inverted – red) Climate • ENSO: • large El Niño in 1997/98; large La Niña in 1998/99 (and possibly 1989?); moderate El Niño in 2002/03 Climate • Key climate indices for North Pacific all show strong changes in 1976/77 during the shift from cold to warm phases of the PDO • But – no consistent shift in these indices is seen in the late 1990’s (NPESR Climate Chapter) • Past 5 years (1999-2003) resemble neither the positive nor negative phases of the PDO • represents a second mode of variability not captured by the PDO Principal components of North Pacific winter (Nov – Mar) SST; PC1 = PDO (E-W mode) PC2 = N-S mode SLP SST Climate • Spatial pattern of this second mode of variability shows strong North – South gradients • Produces strong westerly winds across the Pacific at 45°N • Result is some regions (e.g. Bering Sea) continue conditions during 1990’s (warm); other regions (e.g. California Current) resemble conditions pre-1977 (cold) Climate • Spatial patterns of SLH and SST are consistent with observed variations in the North Pacific Transition Region Climate • The ENSO events since 1998 generated considerable warming in eastern Pacific in 1997/98, cooling in 1999 – 2000, but warming again in 2002 • Energetic zonal winds appear to have deepened the upper mixed layer in the eastern North Pacific (at least from 1999- 2002), which had been shoaling throughout the 1990’s • shallowest mixed layer was observed in 2003 • These unusual winds also forced a pulse of subarctic water into the California Current System, causing changes to the lower trophic levels Productivity Nutrients • Serious lack of consistent and high quality nutrient data for most regions of the North Pacific • In the Gulf of Alaska and California Current Systems, nutrients declined from late 1970’s to late 1990’s, but have been increasing since 1999 Productivity Phytoplankton • Lack of consistent and detailed phytoplankton data for many regions of the North Pacific, although this may change with longer time series of satellite observations • Consistent with declining nutrients, biomass of phytoplankton has been decreasing in the open ocean areas of the western and eastern North Pacific • Since 1999, have observed increases in phytoplankton in the Yellow Sea, west coast of Japan, Gulf of Alaska, west coast of North America • Higher nutrients associated with subarctic water mass intrusion into the California Current System produced a strong phytoplankton bloom in summer 2002 which sank to bottom and caused low oxygen problems Productivity Phytoplankton Chlorophyll a in the Gulf of Alaska (1998 – 2002) Productivity Phytoplankton • Unusual phytoplankton blooms have been increasing in frequency around the North Pacific • Coccolithophorids (Emiliana huxleyi) in the Bering Sea • Pseudo-nitschia spp. (producers of domoic acid) in the California Current System and the Gulf of California • Harmful algal blooms about Korea and in the East China Sea Sea of Okhotsk Productivity Zooplankton • Consistent with long- term changes in phytoplankton, zooplankton biomass has been decreasing 1952 1978 in the Oyashio waters of the western Pacific and in coastal California over past 30 years (but California appears to be increasing since 1999) CalCOFI grid line 80 1974 2000 Productivity Yellow Sea - February Zooplankton • But zooplankton biomass has been increasing in the Yellow Sea and coastal Yellow Sea - August Gulf of Alaska 350 ) • Unusual blooms of t m 300 Entire survey area d gelatinous n 250 SE Middle Shelf Bering Sea a s NW Middle Shelf u 200 zooplankton have o h t ( 150 occurred, in particular s s a 100 m in the Bering Sea o i 50 B 0 1970 1975 1980 1985 1990 1995 2000 2005 YEAR Productivity Zooplankton • Zooplankton species composition along coastal North America and in the Gulf of Alaska has varied with sea temperature, with previously rare southern species increasing in abundance concurrent with El Niño events. • The seasonal timing of peak zooplankton biomass, principally due to Neocalanus, moved 30-60 days earlier in both the eastern and western subarctic North Pacific as a result of the warmer and shallower mixed layer. • In the eastern North Pacific, the timing of the biomass peak has returned to near-normal since 1999 Living Resources • FAO statistics for the eastern and western North Pacific suggest: • similar patterns of the cod-hake group in both regions from 1950-2002, although with less of a decline in the eastern North Pacific in the 1990’s; • synchrony of the small pelagics group with the cod-hake group in the western Pacific in the 1980’s 7000000 2500000 Salmons, trouts, smelts (MT) Salmons, trouts, smelts Flounders, halibuts, sol (MT) (MT) 6000000 Cods, hakes, haddocks (MT) Flounders, halibuts, sol (MT) Herrings, sardines, anch (MT) 2000000 Cods, hakes, haddocks Tunas, bonitos, billfish (MT) (MT) 5000000 Herrings, sardines, anch (MT) Tunas, bonitos, billfish (MT) Western 1500000 4000000 North Eastern 3000000 Pacific 1000000 North Pacific 2000000 500000 1000000 0 0 6 2 8 0 6 8 4 6 2 4 0 2 8 0 6 8 52 54 68 70 84 86 68 76 84 86 92 94 5 52 54 5 5 60 62 6 6 70 7 7 78 8 8 8 9 9 9 Year Year 950 966 982 998 1 19 19 195 1958 1960 1962 1964 1 19 19 197 1974 1976 1978 1980 1 19 19 198 1990 1992 1994 1996 1 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 Living Resources Pollock biomass – Sea of Subarctic Coastal Systems Okhotsk • Fish fauna dominated by gadids, flatfishes, crustaceans, with walleye pollock the major species caught • Recent catches of Walleye pollock in Sea of Walleye Pollock Biomass (age 3+) Okhotsk, Oyashio, 16,000,000 coastal Gulf of Alaska, Eastern Bering 14,000,000 Eastern Bering Sea and off North Korea Gulf of Alaska Sea 12,000,000 declined by large ) t 10,000,000 percentage from 15 years ( 8,000,000 omass earlier; 6,000,000 Bi • Only eastern Bering Sea 4,000,000 Gulf of Alaska has maintained a large 2,000,000 and stable biomass of 0 4 0 3 6 9 2 5 8 4 0 6 67 7 7 7 7 8 91 9 97 0 pollock 98 98 9 19 19 19 19 19 19 1 Year19 1 19 19 1 20 25000 Walleye pollock Living Resources 20000 recruitment – Sea of Okhotsk h s i 15000 f Subarctic Coastal Systems n o i l l • Pollock recruitment has i 10000 general been low M 5000 recently, therefore low biomass may be driven 0 1972 1982 1992 2002 by environmental Year conditions • High and stable biomass in eastern Bering Sea, with conservative management actions, suggests it is important to recognise good recruitment pulses and Gulf of manage conservatively Alaska Living Resources Central Oceanic Gyres • Western and eastern salmon • Total catches of all salmon species through 1990’s, l • Regional differences are important, experiencing problems during improvement since 1999 1, s 200 ubarctic 1, 000 a 0 0 rgely driven 0 1 800 ( h tc 600 g Ca yres are dominated by Pacific 400 200 N by large hatchery releases o r t 1925 0 h were at historical high levels 1925 P a 1 9 2 8 ci 1990’s; there are signs of fi 1 9 3 1 c S with stocks in SE part of range 1934 a lm 1937 o n 1 9 4 0 C a 1 9 4 3 tc h 1946 1949 195 2 1 9 5 5 Pi n k 1958 Ch 1961 u 1 9 6 4 m Y ear 1 9 6 7 So c 1970 k e y 1 9 7 3 e 1 9 7 6 C oho 1979 1982 Ch 1 9 85 in o o 1 9 8 8 k 1991 1994 1 9 9 7 2 0 00 2002 Living Resources Temperate Coastal and Oceanic Systems • Significant fisheries for short-lived pelagic species, as well as demersal species on the continental shelves • Abundances of sardines (in particular) show large fluctuations, often with species replacements: • Sardine reached very large biomasses in mid-late 1980’s in western Pacific (Japan), Yellow Sea – East China Sea, Gulf of California, but then collapsed in early 1990’s • The one region out of synchrony with this pattern is the California Current System, which used to be in phase with Japanese sardine, but remained low in the 1980’s and increased in the 1990’s. • It may be that the natural ability of this stock to increase during favourable conditions was damaged when it was overfished in the mid 20th Century, and it has taken some time to recover this ability Living Resources Temperate Coastal and Oceanic Systems West coast of Japan Yellow Sea – E.
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