Penetration of Bomb ¹⁴C Into the Deepest Ocean Trench

The food source of hadal endemic fauna provides an insight into the carbon cycle in trenches and a biological adaptation to the impoverished and harsh trench environment. Here, we present the first Δ 14 C results of hadal amphipods from three trenches in the Pacific to define the organic matter source in these remote ecosystems. Amphipod muscle tissues contain a bomb 14 C signature (Δ 14 C from 10 ± 2‰ to 65 ± 2‰), thereby revealing a dietary...