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Regional oceanographic controls on water column nitrogen fixation in northern Australian watersOA Marine
Large blooms of the diazotrophic cyanobacteria, Trichodesmium , have been reported along the north coast of Australia and are readily evident in remote sensing images. During a research cruise in November 1999, we sampled from Townsville to Broome, examined Trichodesmium population densities and their rates of carbon and N 2 fixation alongside microscopy-based cell counts of them and other cyanobacterial diazotrophs. Additiona...
Ambient noise and ERT data provide insights into the structure of co-seismic rock avalanche deposits in Sichuan (China)NARA Subscribed
The post-seismic history of the 2008 Mw7.9 Wenchuan earthquake shows that marginally stable deposits of large co-seismic landslide dams can pose persistent debris flow hazards for the downstream areas. Here, we combine analyses of single-station recordings of ambient noise with electrical resistivity tomography (ERT) surveys to explore the potential of drawing information on structure and geometry of the deposit of a large roc...
Summary Results of recent modelling efforts imply denitrification‐influenced waters, such as those in the E astern T ropical S outh P acific ( ETSP ), may support high rates of biological nitrogen fixation ( BNF ), yet little is known about the N 2 ‐fixing microbial community in this region. Our characterization of the ETSP diazotrophic community along a gradient from upwelling‐influenced to oligotrophic waters did not detect...
The vertical and horizontal distributions of seven diazotrophic populations in the western tropical north Atlantic (WTNA) Ocean were examined using a nifH DNA quantitative polymerase chain reaction (QPCR) approach. The nifH phylotype abundances were highest near the surface and decreased with depth, with the exception of the cyanobacterial symbiont Calothrix , which was not detected at any station. Richelia associated with the...
Nitrogen fixation and nitrogen isotope abundances in zooplankton of the oligotrophic North AtlanticNARA Subscribed
Deep‐water nitrate is a major reservoir of oceanic combined nitrogen and has long been considered to be the major source of new nitrogen supporting primary production in the oligotrophic ocean. 15 N: 14 N ratios in plankton provide an integrative record of the nitrogen cycle processes at work in the ocean, and near‐surface organic matter in oligotrophic waters like the Sargasso Sea is characterized by an unusually low 15 N con...
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