The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 Intertidal scouring by sea ice 1123 .«-N 1,000 >.^ \- 100 I O 10 LU ^ 1- LU ^ 0 SESSILE INVERTEBRATES UPPER INTERTIDAL 2 3 1 _L _L 4 1 - Balanus cariosus 2 ' Balanus glandula 3' Chthamalus dalli 4 - Mytilus edulis I- I g UJ LU ST. GEORGE ISLAND OTTER ISLAND AMAK ISLAND AKUN ISLAND Figure 64-7. Mean weight of sessile invertebrates at two ice-scoured (St. George and Otter islands) and two unscoured islands in the Ber
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 Intertidal scouring by sea ice 1123 .«-N 1,000 >.^ \- 100 I O 10 LU ^ 1- LU ^ 0 SESSILE INVERTEBRATES UPPER INTERTIDAL 2 3 1 _L _L 4 1 - Balanus cariosus 2 ' Balanus glandula 3' Chthamalus dalli 4 - Mytilus edulis I- I g UJ LU ST. GEORGE ISLAND OTTER ISLAND AMAK ISLAND AKUN ISLAND Figure 64-7. Mean weight of sessile invertebrates at two ice-scoured (St. George and Otter islands) and two unscoured islands in the Bering Sea. Vertical lines are 95-percent confidence intervals. places apparently are refugia for species whose growth form or light requirements, or both, permit them to occupy such micro habitats. In one area of shore at Garden Cove, St. George Island, deep fissures in the bedrock and offshore reefs protected much of the rock surface from ice scouring (T. R. Merrell, Jr., personal communication, 1979). The biota included large Collisella pelta, urchins, and several species of sessile organisms, including Balanus cariosus, two sponges, hydroids, bryozoans, tubeworms, tunicates, and coralline algae (R. T. Myren, unpublished data on file at Northwest and Alaska Fisheries Center, Auke Bay Laboratory, Juneau). Subtidal observations by divers from the Auke Bay Laboratory indicated that the effect of ice scour generally reached 3-4 m in depth. In June 1976, six weeks after the last ice-scouring episode, N. Calvin (personal communication 1979) and others observed that above this lower limit at several locations, the upper surfaces of rock were occupied primarily by filamentous green algae and small individuals of Alaria sp. These algae had probably settled and
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