Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean

@article{Foster2007InfluenceOT,
  title={Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean},
  author={Rachel A Foster and Ajit Subramaniam and Claire Mahaffey and Edward J. Carpenter and Douglas G. Capone and Jonathan P. Zehr},
  journal={Limnology and Oceanography},
  year={2007},
  volume={52},
  pages={517-532}
}
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 diatoms Rhizosolenia clevei and Hemiaulus hauckii were distributed… Expand

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References

SHOWING 1-10 OF 55 REFERENCES
Widespread occurrence of the Hemiaulus-cyanobacterial symbiosis in the southwest north Atlantic Ocean
Epifluorescent examination of Jive Hemiaulus spp. during September 1991 and JanuaryFebruary 1992 in the Bahama Islands, southwest North Atlantic Ocean, and Caribbean Sea indicated that 91-100% of theExpand
Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical and subtropical North Atlantic Ocean
TLDR
Results from 154 stations on six research cruises in the North Atlantic Ocean show depth-integrated N2 fixation by Trichodesmium spp. Expand
Extensive bloom of a N2-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean
TLDR
The bloom was spatially extensive, as revealed by satellite imagery, and is calculated to have contributed about 0.5 Tg N to the euphotic zone, demonstrating that heterocystous cyanobacteria can also make quantitatively important contributions of N in oceanic water column environments. Expand
Diazotrophic Diversity and Distribution in the Tropical and Subtropical Atlantic Ocean
TLDR
The data suggest a community shift from filamentous cyanob bacteria in surface waters to unicellular cyanobacteria and/or heterotrophic bacteria in deeper waters. Expand
High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean
TLDR
Direct measurements of 15N2 fixation by small diazotrophs in various parts of the Pacific Ocean, including the waters off Hawaii where the unicellular diazOTrophs were first characterized, show that N1 fixation by unicells can support a significant fraction of total new production in oligotrophic waters. Expand
Influence of the Amazon River on the surface optical properties of the western tropical North Atlantic Ocean
The distribution of chromophoric-dissolved-organic-matter (CDOM) was investigatedin the western tropical North Atlantic Ocean (WTNA) during the low and high flowperiods of the Amazon River. A strongExpand
Vertical distributions of nitrogen-fixing phylotypes at Stn ALOHA in the oligotrophic North Pacific Ocean
TLDR
Differences in the depth distributions of N 2 -fixing plankton at Stn ALOHA are revealed, and it is suggested that unicellular diazotrophs comprise a significant component of plankton biomass in this oligotrophic marine ecosystem. Expand
Temporal Patterns of Nitrogenase Gene (nifH) Expression in the Oligotrophic North Pacific Ocean
TLDR
The temporal separation of nifH expression by the various phylotypes suggests that open ocean diazotrophic cyanobacteria have unique in situ physiological responses to daily fluctuations of light in the upper ocean. Expand
Phytoplankton biomass and productivity in the Amazon River plume: correlation with seasonal river discharge
Abstract Phytoplankton biomass and primary productivity were assessed on the continental shelf in the plume of the Amazon River during a series of cruises conducted within periods of minimum,Expand
Major Role of the Cyanobacterium Trichodesmium in Nutrient Cycling in the North Atlantic Ocean
TLDR
Measurements of abundance, plus a review of earlier observations, indicate that the diazotrophic cyanobacterium Trichodesmium is the most important primary producer in the tropical North Atlantic Ocean and introduces the largest fraction of new nitrogen to the euphotic zone. Expand
...
1
2
3
4
5
...