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 Figure 65-4. Distribution and biomass of total epifauna in the northeastern Bering Sea. Invertebrates included 11 phyla, 94 families, and 186 species. The phyla containing the majority of the species were MoUusca (71 species), Arthropoda (39), Echinodermata (25), and Annelida (16); Urochordata (Chordata), Ectoprocta, and Cnidaria had 10, 9, and 8 species, respectively (Tables 65-1, 65-2, and 65-3). Echinodermata were dominant in
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 Figure 65-4. Distribution and biomass of total epifauna in the northeastern Bering Sea. Invertebrates included 11 phyla, 94 families, and 186 species. The phyla containing the majority of the species were MoUusca (71 species), Arthropoda (39), Echinodermata (25), and Annelida (16); Urochordata (Chordata), Ectoprocta, and Cnidaria had 10, 9, and 8 species, respectively (Tables 65-1, 65-2, and 65-3). Echinodermata were dominant in biomass ( percent). Mollusca, Arthropoda, and Urochordata contributed , , and percent of the total biomass, respectively. Fifteen species made up percent of the epifaunal biomass. The most important species were the echinoderms Asterias amurensis ( percent of the total biomass) and Leptasterias polaris aceruata ( percent) and the moWuskNeptunea heros ( percent). The 0-40 m depth stratum was dominated by Asterias amurensis and Neptunea heros; deeper stations, >40-100 m, had higher concentrations of Leptasterias polaris acervata and Strongylocentrotus droebachiensis. DOMINANT EPIFAUNAL SPECIES The following 11 species were dominant in biomass or abundance, or both, in at least one of the three study areas. Whelk Neptunea heros Among the more than 100 species of moUusks encountered, Neptunea heros was the dominant species in all three study areas (Tables 65-3 and 65-4; Figs. 65-7 to 65-9). The biomass of this whelk increased with increasing latitude; it was most evident in the southeastern Chukchi Sea, where it made up percent of the total epifaunal biomass with an average biomass of g/m^. Neptunea heros had a mean density of in the southeastern
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