. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Average migration (max. adv.) 10" 10= Distance (meters) Figure 36-11. Ranges of advection and migration of stocks in marine ecosystems. "Life cycle" SemiannuaK Reversible components. 10 10-^ lO-" 10' Time (hours) "Nonreversible" component 10= 10° Figure 36-12. Relative ciianges in abundance of stocks due to advection and migration. any regEird to the ice edge and some inshore stocks overwinter in ice-covered coastal regime. I
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Average migration (max. adv.) 10" 10= Distance (meters) Figure 36-11. Ranges of advection and migration of stocks in marine ecosystems. "Life cycle" SemiannuaK Reversible components. 10 10-^ lO-" 10' Time (hours) "Nonreversible" component 10= 10° Figure 36-12. Relative ciianges in abundance of stocks due to advection and migration. any regEird to the ice edge and some inshore stocks overwinter in ice-covered coastal regime. In only a few instances is there specific evidence of environ- mental influences. Yet if one approaches these conditions or events from a fishery oceanographer's or environmentalist's point of view rather than from that of a management biologist, another perspective is evident. TABLE 36-2 Speeds of migrating fish Species Speed (km/d) Sole" Plaice" Herring" Salmon (sockeye)^ Salmon (chum)^ Halibut^ Herring^ Yellowfin sole^ 7-16 1- 7 4-30 54 48 6 25 3- 7 " Harden Jones (1977)—North Sea area ^Kondo et al. (1965)-E. Bering Sea shelf ^Noviko (1970)-E. Bering Sea shelf "* Estimated from spawning migration—E. Bering Sea shelf Winter Most discussions of productivity deal with condi- tions on the roughly one million km^ of shelf, yet it is obvious that most of the biomass (excluding mammals) is restricted to a small fraction (less than a fifth) of the total shelf area for nearly half the year, November to April. Although one might argue that feeding in winter is usually drastically reduced, it should be obvious that bottom temperatures at the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hood, D. W. (Donald Wilbur), 1918-; Calder, John A; United States. Office of Marine Pollution Asses
Size: 2486px × 1005px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionamericana, bookdecade1980, bookspo
