Trophic relations in the subArctic North Pacific ecosystem: Possible feeding effect from pink salmon

被引:97
作者
Shiomoto, A
Tadokoro, K
Nagasawa, K
Ishida, Y
机构
[1] Natl. Res. Inst. of Far Seas Fish., Shimizu-shi, Shizuoka, 424, 7-1
关键词
phytoplankton; zooplankton; pink salmon; grazing; feeding; trophic relation; subarctic ecosystem;
D O I
10.3354/meps150075
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Year-to-year variations in biomass of phytoplankton (surface chlorophyll a concentration) and macrozooplankton (wet weight obtained by NORPAC net operation above 150 m), and abundance of pink salmon (catch per unit effort of pink salmon) from 1985 to 1994 in the subarctic North Pacific in summer were studied. After 1989, phytoplankton biomass and pink salmon abundance showed corresponding yearly patterns, whereas the pattern shown by macrozooplankton biomass was always the inverse of that shown by phytoplankton and salmon. We suggest that macrozooplankton biomass remained low when pink salmon was abundant due to the intense feeding impact of pink salmon, which in turn allowed phytoplankton biomass to remain high as a result of the lesser grazing effect of macrozooplankton. The opposite phenomenon probably occurred when pink salmon was not abundant. Prior to 1989, macrozooplankton biomass was at a rather high level while phytoplankton biomass and pink salmon abundance were low. We suggest that macrozooplankton biomass remained high due to a lesser feeding impact of the pink salmon, and phytoplankton biomass remained low due to the intense grazing effect of macrozooplankton. Our study therefore shows the possibility that the feeding effect from the pink salmon controls summer macrozoo- and phytoplankton biomass in the subarctic North Pacific.
引用
收藏
页码:75 / 85
页数:11
相关论文
共 63 条
  • [41] TROPHIC RELATIONSHIPS IN FRESH-WATER PELAGIC ECOSYSTEMS
    MCQUEEN, DJ
    POST, JR
    MILLS, EL
    [J]. CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1986, 43 (08) : 1571 - 1581
  • [42] ECOLOGICAL DYNAMICS IN THE SUB-ARCTIC PACIFIC, A POSSIBLY IRON-LIMITED ECOSYSTEM
    MILLER, CB
    FROST, BW
    WHEELER, PA
    LANDRY, MR
    WELSCHMEYER, N
    POWELL, TM
    [J]. LIMNOLOGY AND OCEANOGRAPHY, 1991, 36 (08) : 1600 - 1615
  • [43] MILLER CB, 1984, PROG OCEANOGR, V13, P201, DOI 10.1016/0079-6611(84)90009-0
  • [44] DEVELOPMENT OF LARGE COPEPODS DURING SPRING IN THE GULF-OF-ALASKA
    MILLER, CB
    [J]. PROGRESS IN OCEANOGRAPHY, 1993, 32 (1-4) : 295 - 317
  • [45] Motoda S., 1974, OCEANOGRAPHY BERING, V2, P207
  • [46] Odate Tsuneo, 1993, Bulletin of Plankton Society of Japan, V39, P127
  • [47] Odate Tsuneo, 1994, Fisheries Oceanography, V3, P267, DOI 10.1111/j.1365-2419.1994.tb00104.x
  • [48] PARSONS TR, 1988, OCEANOGR MAR BIOL, V26, P317
  • [49] Parsons TR., 1984, A manual for chemical and biological methods in seawater analysis
  • [50] Parsons TR., 1984, BIOL OCEANOGRAPHIC P, V2nd