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Determination of aquatic food‐web structure based on compound‐specific nitrogen isotopic composition of amino acids
This study investigated the δ15N signatures of amino acids in 17 photoautotrophs and the trophic relationships during four controlled feeding experiments using green algae, zooplankton, and fish, implying that the amino acid method can be applied to a variety of organisms. Expand
Metabolic control of nitrogen isotope composition of amino acids in macroalgae and gastropods: implications for aquatic food web studies
It is suggested here that metabolic fate is an impor- tant factor in producing distinct trophic relationships in nitrogen isotopic compositions between amino acids. Expand
The importance of diazotrophic cyanobacteria as primary producers during Cretaceous Oceanic Anoxic Event 2
Abstract. In Livello Bonarelli black shale deposited during Cretaceous Oceanic Anoxic Event 2 (OAE-2, ca. 94 Ma), nitrogen isotopic compositions of bulk sediments are mostly in a narrow range fromExpand
Complete genome of a nonphotosynthetic cyanobacterium in a diatom reveals recent adaptations to an intracellular lifestyle
The E. turgida spheroid body (EtSB) genome was found to possess a gene set for nitrogen fixation, as anticipated, but is reduced in size and gene repertoire compared with the genomes of their closest known free-living relatives. Expand
Ubiquity and quantitative significance of detoxification catabolism of chlorophyll associated with protistan herbivory
The herbivorous protists that convert chlorophyll a to cPPB-aE are suggested to play more significant roles in the modern oceanic carbon flux than was previously recognized, critically linking microscopic primary producers to the macroscopic food web and carbon sequestration in the ocean. Expand
Diazotrophic cyanobacteria as the major photoautotrophs during mid-Cretaceous oceanic anoxic events: Nitrogen and carbon isotopic evidence from sedimentary porphyrin
Abstract We determined both the nitrogen and carbon isotopic compositions of nickel-chelated deoxophylloerythroetioporphyrin (Ni DPEP), a major sedimentary porphyrin extracted from the Livello SelliExpand
An improved method for isolation and purification of sedimentary porphyrins by high-performance liquid chromatography for compound-specific isotopic analysis.
An improved method for purification of sedimentary vanadyl and nickel porphyrins requires neither derivatization nor demetallation and significantly reduced the overall retention time down to 60% compared with the previous work. Expand
Reconstruction of the biogeochemistry and ecology of photoautotrophs based on the nitrogen and carbon isotopic compositions of vanadyl porphyrins from Miocene siliceous sediments
The distinctive isotopic signals support the interpretations of previous works that the origin of 17-Nor-deoxophylloerythroetioporphyrin (DPEP) is chlorophylls-c1-3, whereas 8-nor-DPEP may have originated from chlorophyLLs-a2 or b2 or bacteriochlorophyll-a, and suggest that the latter represents a specific population within the photoautotrophic community. Expand
Low-diversity shallow marine benthic fauna from the Smithian of northeast Japan: paleoecologic and paleobiogeographic implications
Abstract An unusually low-diversity shallow marine benthic community in a siliciclastic setting was identified and described from the Lower Triassic (Smithian) Hiraiso Formation (Southern KitakamiExpand
Evidence of Global Chlorophyll d
The data show that the viable habitat for Chl d‐producing phototrophs extends across salinities of 0 to 50 practical salinity units and temperatures of 1� to 40�C, suggesting that Chld production can be ubiquitously observed in aquatic environments that receive near-infrared light. Expand