Title:
Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean
Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean
| dc.contributor.author | Carpenter, Edward J. | en_US |
| dc.contributor.author | Montoya, Joseph P. | en_US |
| dc.contributor.author | Burns, James | en_US |
| dc.contributor.author | Mulholland, Margaret R. | en_US |
| dc.contributor.author | Subramaniam, Ajit | en_US |
| dc.contributor.author | Capone, Douglas G. | en_US |
| dc.contributor.corporatename | State University of New York at Stony Brook. Marine Sciences Research Center | en_US |
| dc.contributor.corporatename | Georgia Institute of Technology. School of Biology | en_US |
| dc.contributor.corporatename | University of Maryland Center for Environmental Sciences. Chesapeake Biological Laboratory | en_US |
| dc.contributor.corporatename | USC Wrigley Institute for Environmental Studies | en_US |
| dc.date.accessioned | 2012-03-26T20:26:33Z | |
| dc.date.available | 2012-03-26T20:26:33Z | |
| dc.date.issued | 1999-08-20 | |
| dc.description | © 1999 Inter-Research | en_US |
| dc.description | DOI: 10.3354/meps185273 | en_US |
| dc.description.abstract | We encountered an extensive bloom of the colonial diatom Hemiaulus hauckii along a 2500 km cruise track off the NE coast of South America in autumn 1996. Each diatom cell contained the heterocystous, N₂-fixing cyanobacterial endosymbiont Richelia intracellularis. Surface Richelia heterocyst (and filament) densities increased from <100 to >10⁶ heterocyst l⁻¹ in the bloom. Total abundance ranged from 10⁶ heterocyst m⁻² outside the bloom to over 10¹⁰ heterocyst m⁻² within the bloom. Rates of primary production averaged 1.2 g C m⁻² d⁻¹, higher than typical for oligotrophic open ocean waters. N₂ fixation during the bloom by the Richelia/Hemiaulus association added an average of 45 mg N m⁻² d⁻¹, to the water column. The relative importance of NH₄⁺ uptake over the course of the bloom increased from 0 to 42% of total N uptake by the Hemiaulus/Richelia association. N2 fixation by Richelia exceeded estimates of 'new' N flux via NO₃ diffusion from deep water and, together with additional N₂ fixation by the cyanobacterium Trichodesmium, could supply about 25% of the total N demand through the water column during the bloom. Suspended particles and zooplankton collected within the bloom were depleted in ¹⁵N, reflecting the dominant contribution of N₂ fixation to the planktonic N budget. 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. Such blooms may represent an important and previously unrecognized source of new N to support primary production in nutrient-poor tropical waters. Furthermore, this bloom demonstrates that heterocystous cyanobacteria can also make quantitatively important contributions of N in oceanic water column environments. | en_US |
| dc.identifier.citation | Carpenter, E.J., J.P. Montoya, J. Burns, M. Mulholland, A. Subramanian, and D.G. Capone. 1999. Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic OceanMar. Ecol. Prog. Ser. 185: 273-283 | en_US |
| dc.identifier.doi | 10.3354/meps185273 | |
| dc.identifier.issn | 0171-8630 | |
| dc.identifier.uri | http://hdl.handle.net/1853/43100 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Georgia Institute of Technology | en_US |
| dc.publisher.original | Inter-Research | en_US |
| dc.subject | N₂ fixation | en_US |
| dc.subject | Cyanobacteria | en_US |
| dc.subject | Richelia | en_US |
| dc.subject | Symbiont | en_US |
| dc.subject | Diazotroph | en_US |
| dc.subject | N cycling | en_US |
| dc.subject | Hemiaulus | en_US |
| dc.title | Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean | en_US |
| dc.type | Text | |
| dc.type.genre | Article | |
| dspace.entity.type | Publication | |
| local.contributor.author | Montoya, Joseph P. | |
| local.contributor.corporatename | College of Sciences | |
| local.contributor.corporatename | School of Biological Sciences | |
| relation.isAuthorOfPublication | 0000b67d-bef5-4edf-b2d6-3577c297f4c3 | |
| relation.isOrgUnitOfPublication | 85042be6-2d68-4e07-b384-e1f908fae48a | |
| relation.isOrgUnitOfPublication | c8b3bd08-9989-40d3-afe3-e0ad8d5c72b5 |
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