The Alaska Fisheries Science Center (AFSC) and the Russian Pacific Institute of Fisheries and Ocean Research (TINRO) each have conducted substantial ecosystem studies on their respective sides of the Bering Sea over the past 50 years. In a management context, the waters of the Bering Sea lie in both Russian and U.S. Exclusive Economic Zones (EEZs), with international waters in a section of the central basin commonly known as the donut hole.
The Bering Sea covers more than 2.3 million km2 and supports high biological
production and multiple fisheries. On one hand, the differences in physical
and biological conditions between the eastern and western areas may result
in fundamentally different responses to ecosystem change. On the other
hand, the presence of the same commercially important fish species such
as walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus)
in both areas may result in profound similarities.
In order to develop meaningful measures of large marine ecosystem (LME) function and health, a comparative study of ecosystems is required. One basis for comparison is the food webthe system of predator/prey relationships by which energy originating in sunlight is passed through plankton, fish, birds, marine mammals, and humans. The study of changes in the structure and function of food webs over time may reveal critical relationships between marine ecosystems, climate, and fishing.
Such comparisons require synthesizing large bodies of literature that exist in different locations and contain results in different contextual formats not readily adaptable for comparison. Our study aimed to synthesize data on ecosystem production and energy pathways in the eastern and western Bering Sea shelf and slope regions by developing and comparing quantitative food web models of these areas by combining data from fisheries agencies on both sides of the Bering Sea.
The resulting models both highlight the dominant predator/prey processes
as they can be gleaned from the data and help focus on major data gaps
relative to their importance in the ecosystem as a whole. An 11-page summary of
the study is available as the feature article in the April-June 2003 issue of
the AFSC Quarterly Report. (pdf; 1.87MB) The full models
resulting from this study were published in Aydin, K. Y., V. V. Lapko,
V. I. Radchenko, and P. A. Livingston. 2002. A comparison of the eastern
and western Bering Sea shelf and slope ecosystems through the use of mass-balance
food web models. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-130, 78
p, available online in the Publications section of the AFSC websiteat www.afsc.noaa.gov/Publications/AFSC-
Auke Bay Lab