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Despite the importance of the Bering Sea for subarctic oceanography and climate, relatively little is known of the\udforaminifera from the extensive Aleutian Basin. We report the occurrence of modern deep-water agglutinated foraminifera\udcollected at seven sites cored during Integrated Ocean Drilling Program (IODP) Expedition 323 in the Bering Sea. Assemblages\udcollected from core-top samples contained 32 genera and 50 species and are described and illustrated here for the first time.\udCommonly occurring species include typical deep-water\udRhizammina\ud,\udReophax\ud,\udRhabdammina\ud,\udRecurvoides\udand\udNodulina\ud.\udAssemblages from the northern sites also consist of accessory\udCyclammina\ud,\udEggerelloides\udand\udGlaphyrammina\ud, whilst those of\udthe Bowers Ridge sites consist of other tubular genera and\udMartinottiella\ud. Of the studied stations with the lowest dissolved\udoxygen concentrations, the potentially Bering Sea endemic\udEggerelloides\udsp. 1 inhabits the northern slope, which has the\udhighest primary productivity, and the potentially endemic\udMartinottiella\udsp. 3 inhabits Bowers Ridge, which has the lowest\udoxygen concentrations but relatively low annual productivity.\udMartinottiella\udsp. 3, with open pores on its test surface, has\udpreviously been reported in Pliocene to Recent material from Bowers Ridge. Despite relatively small sample sizes, ecological\udconstraints may imply that the Bering Sea experienced high productivity and reduced oxygen at times since at least the Pliocene.\udWe note the partially endemic nature of the agglutinated foraminiferal assemblages, which may at least in part be due to basin\udrestriction, the geologically long time period of reduced oxygen, and high organic carbon flux. Our results indicate the\udimportance of gathering further surface sample data from the Aleutian Basin

Modern deep-water agglutinated foraminifera from IODP Expedition 323, Bering Sea: ecological and taxonomic implications