The “biological pump” is the process by which photosynthetically-produced organic matter in
the ocean descends from the surface layer to depth by a combination of sinking particles …

Compound-specific isotopic analysis of amino acids (CSIA-AA) has emerged in the last
decade as a powerful approach for tracing the origins and fate of nitrogen in ecological and …

Nitrogen (N) has two stable isotopes, 14N and 15N (atomic masses of 14 and 15,
respectively). 14N is the more abundant of the two, comprising 99.63 Æ 0.02% of the N …

Marine particulate organic carbon (POC) contributes to carbon export, food webs, and
sediments, but uncertainties remain in its origins. Globally, variations in stable carbon …

The dynamics of the particulate organic carbon (POC) pool in the ocean are central to the
marine carbon cycle. POC is the link between surface primary production, the deep ocean …

Deep-sea fishes inhabit∼ 75% of the biosphere and are a critical part of deep-sea food
webs. Diet analysis and more recent trophic biomarker approaches, such as stable isotopes …

Most of the carbon fixed in primary production is rapidly cycled and remin-eralized, leaving
behind various forms of organic carbon that contribute to a vast reservoir of nonliving …

Compound‐specific stable isotope analysis of individual amino acids (CSIA‐AA) has
emerged as a transformative approach to estimate consumer trophic positions (TPCSIA) that …

Dinitrogen (N2) fixation is an important source of biologically reactive nitrogen (N) to the
global ocean. The magnitude of this flux, however, remains uncertain, in part because N2 …

Complex assemblages of microbes in the surface ocean are responsible for approximately
half of global carbon fixation. The persistence of high taxonomic diversity despite …