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Abstract. To study sinking particle sources and dynamics, sedimenttraps were deployed at three sites in the Amundsen Sea for 1 year fromFebruary–March 2012 and at one site from February 2016 to February 2018.Unexpectedly, large benthic invertebrates were found in three sediment trapsdeployed 130–567 m above the sea floor. The organisms included long andslender worms, a sea urchin, and juvenile scallops of varying sizes. This isthe first reported collection of these benthic invertebrates in sedimenttraps. The collection of these organisms, predominantly during the australwinter, and their intact bodies suggests they were trapped in anchor ice,incorporated into the overlying sea ice, and subsequently transported by icerafting. The observations imply that anchor ice forms episodically in theAmundsen Sea and has biological impacts on benthic ecosystems. Analternative hypothesis that these organisms spend their juvenile periodunderneath the sea ice and subsequently sink to the seafloor is alsosuggested.

Collection of large benthic invertebrates in sediment traps in the Amundsen Sea, Antarctica