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  • Articles  (13)
  • Climate variability
  • Decadal Climate
  • North Atlantic
  • Salinity
  • 2015-2019
  • 2005-2009  (13)
  • 2009  (13)
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  • Articles  (13)
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  • 2015-2019
  • 2005-2009  (13)
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  • 1
    Publication Date: 2021-05-19
    Description: The North-West of Urabá Gulf in the Southern Caribbean supports a variety of coral reef zones in conditions of high turbulence and fluctuating turbidity and salinity. Sponge composition and density were surveyed and their relationship with physical and structural features of the reef zones were analyzed. In total, 65 demosponges and 1 calcareous sponge species were encountered along belt transects (20 m2) on 11 stations between 1 and 17 m in depth. Sponge density in Urabá tended to be higher than in other areas with water conditions optimal for coral reef development (i.e. Roncador, Serrana and Quitasueño remote oceanic atolls in the SW Caribbean, Colombia) due possibly to higher concentrations of organic suspended materials discharged from rivers. Nevertheless, this effect was not reflected in the Urabá‘s species richness as just a limited number of species (Niphates erecta, Iotrochota birotulata and Mycale laevis) had high densities. Multivariate analyses showed that sponge community composition varies along a depth gradient and across habitats (coral and geomorphological zones), similar to the patterns observed in other Caribbean areas. However, marked taxonomic differences between shallow (〈4 m) and deeper (〉6 m) zones and the great increase of the sponge density below just 6 m, seem to be a unique feature of Urabá. The absence of many species and the low abundance of sponges in shallow zones (〈 6 m) may be due, not only to the variables associated to low depth, like turbulence, which is periodically very strong, but also to great fluctuations in surface salinity due to discharges of the Atrato and other local rivers. The shallow and deep stations that had low sponge richness and density, showed the greatest urchin densities (especially Echinometra viridis); therefore, it is possible that these urchins may be playing an additional controlling role on sponge populations.
    Description: El costado noroccidental del Golfo de Urabá en el sur del Mar Caribe alberga variadas zonas coralinas sometidas a condiciones de alta turbulencia y salinidad y turbidez fluctuantes. Allí se estudió la composición y densidad de esponjas marinas (Porifera) y se analizó su relación con factores físicos y características estructurales de las zonas coralinas. En total, 65 especies de la clase Demospongiae y una especie de la clase Calcarea fueron registradas dentro de transectos de banda (20 m2) dispuestos en 11 estaciones entre 1 y 17 m de profundidad. La densidad de esponjas en el Urabá tendió a ser superior a la encontrada en otras áreas de condiciones óptimas para el desarrollo arrecifal (ej. Atolones remotos como Roncador, Serrana y Quitasueño, Caribe insular colombiano), posiblemente por un mayor volumen material orgánico en suspensión proveniente de los ríos. No obstante, tal efecto no se reflejó en la riqueza de especies del Golfo de Urabá, ya que solo un número limitado de especies (Niphates erecta, Iotrochota birotulata y Mycale laevis) tuvo densidades elevadas. Análisis multivariados permitieron establecer que la composición de la comunidad de esponjas varía a lo largo del gradiente de profundidad y entre hábitats (zonas coralinas y unidades geomorfológicas) de manera similar a otras áreas coralinas del Caribe. Empero, la existencia de diferencias marcadas en composición taxonómica entre zonas someras (〈4 m) y más profundas (〉6 m), y el aumento brusco de la densidad a sólo 6 m de profundidad, parecen ser características únicas de Urabá. La ausencia de muchas especies y la baja densidad de esponjas en las zonas someras se pueden deber no sólo a las variables asociadas con la baja profundidad, especialmente la turbulencia, periódicamente muy alta en el área, sino también a grandes fluctuaciones de la salinidad en la superficie por descargas del río Atrato y otros ríos locales. En las estaciones someras y profundas en que la riqueza y densidad de esponjas fue baja, se encontraron las mayores densidades de erizos (especialmente Echinometra viridis), por lo que es posible que estos erizos estén jugando un papel controlador adicional sobre las poblaciones de esponjas.
    Description: Published
    Description: Porifera
    Keywords: Distribution ; Turbidity ; Sponges ; Salinity ; Sponges ; Distribution ; Salinity ; Turbidity
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.37-56
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  • 2
    Publication Date: 2021-05-19
    Description: Microalgae are important for the restoration of coastal lagoon ecosystems affected by human activities because they are useful indicators of variations of salinity and levels of nutrients such as silicate and phosphate in the water column. With the centric diatom Actinocyclus normanii from Ciénaga Grande de Santa Marta (Colombian Caribbean) we conducted several experiments to evaluate the responses of this species at three levels of salinity (0, 15 and 25) and two initial densities (100 and 800 cells·ml-1) to nine treatments combining several concentrations of phosphate (0, 1,5 and 3,0 µmol·l-1) and silicate (10, 150 and 300 µmol·l-1). All treatments were maintained with light intensity of 57,9 mE-2·seg-1, photoperiod of 12:12 hrs, temperature between 22 and 24 ºC and constant aeration. Results show that A. normanii grows in function of silicate, phosphate and salinity but silicate exerts a more important effect than phosphate while high salinity reduced the density of cells. The treatment that combined concentrations of 300 µmol·l-1 silicate and 3 µmol·l-1 phosphate achieved the highest density (11.700 cells·ml-1) at salinity 0. This density is 12 fold than the obtained with the lowest silicate and phosphate concentrations in non-saline medium. Growth of A. normanii decreases with salinity, despite that the species exhibit certain degree of halotolerance, thus this species can be considered as indicator of non saline and (at least) silicate enriched conditions.
    Description: Es de interés el estudio de especies de microalgas bioindicadoras en lagunas costeras en proceso de reestauración, en función de la salinidad, silicato y fosfato. La respuesta de la diatomea centrica Actinocyclus normanii, proveniente de la Ciénaga Grande de Santa Marta, laguna del Caribe colombiano, fue evaluada en condiciones de laboratorio. Se realizaron dos grupos de bioensayos a una densidad celular inicial de 100 y de 800 cel·ml-1. En ambos experimentos se estudió el efecto combinado de la salinidad (0, 15 y 25), fosfato (0,03, 1,5 y 3,0 µmol·l-1 ) y silicato (10, 150 y 300 µmol·l-1). Todos los cultivos se mantuvieron a una intensidad luminosa de 3 Klux (57,9 mE-2seg-1), fotoperiodo 12:12h, 22- 24 ºC y aireación constante. Se confirmó que el crecimiento de la diatomea estaba en función de la concentración del silicato, fosfato y salinidad. El silicato ejerció el efecto más estimulante, secundado por el fosfato; mientras que la salinidad disminuye la densidad celular. El tratamiento en el cual se produjo la mayor densidad 11.700 cel·ml-1, contenía la combinación de silicato 300 µmol·l-1, fosfato 3 µmol·l-1 y salinidad 0; la densidad obtenida es 12 veces mayor, con relación a la obtenida a la menor concentración de silicato y fosfato en medio de salinidad cero. Aunque, el crecimiento disminuye con la salinidad, la diatomea mostró cierto grado de halotolerancia. Se sugiere que Actinocyclus constituye una especie indicadora de aguas dulces y al menos, ricas en silicato.
    Description: Published
    Description: Actinocyclus, Bioindicator
    Keywords: Phosphates ; Salinity ; Silicates ; Phosphates ; Salinity ; Silicates
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.169-181
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  • 3
    Publication Date: 2021-05-19
    Description: More than one hundred oceanographic stations were occupied between the Galápagos Archipiélago and the Ecuadorian coast during April-May 1995. All the information were treated statically using the method of ”Kriging” to interpolate; from this, surface distribution of sea temperature, sea temperature anomalies, air temperature, and atmospheric presion were obtained. These distributions with temperature and salinity profiles showed the end of the warm period 1994-1995. Upwelling events were detected and were supposed to about 24% of AESS. From the mass water analysis carried out to the east San Cristóbal. It was found a probable relationship between the AESS and the ASTS, and the pelagic fisheries.
    Description: Published
    Keywords: Atmospheric pressure ; Salinity ; Oceanographic data ; Temperature (air-sea) ; Atmospheric pressure ; Salinity
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 4
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    In:  Marine Biology Research vol. 5, pp. 207-243
    Publication Date: 2024-01-12
    Description: The Icelandic pectinoid fauna is reviewed, based on material from the benthic survey programme BIOICE and 17 species are recorded. Similipecten oskarssoni is proposed as a replacement name for Pecten groenlandicus var. minor Locard, 1898 (Propeamussiidae), which is considered a valid species. Lectotypes are designated for Pecten groenlandicus var. minor and Pecten frigidus Jensen, 1904 (Pectinidae). Cyclopecten ambiannulatus Schein, 1989, Parvamussium propinquum (Smith, 1885), Catillopecten eucymatus (Dall, 1898), and Aequipecten opercularis (Linnaeus, 1758) were previously not known from the Icelandic fauna. All species are figured and described and distinguishing characters are discussed. The distribution in Scandinavian and North Atlantic waters is revised based on the collections in SMNH. The low frequency of juvenile specimens of A. opercularis, Mimachlamys varia and Pecten maximus may indicate that Scandinavian populations are the result of very occasional recruitment.
    Keywords: Pectinoidea ; taxonomy ; new species ; North Atlantic ; Iceland ; BIOICE
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 5
    Publication Date: 2009-05-22
    Description: Many features of the Martian landscape are thought to have been formed by liquid water flow and water-related mineralogies on the surface of Mars are widespread and abundant. Several lines of evidence, however, suggest that Mars has been cold with mean global temperatures well below the freezing point of pure water. Martian climate modellers considering a combination of greenhouse gases at a range of partial pressures find it challenging to simulate global mean Martian surface temperatures above 273 K, and local thermal sources cannot account for the widespread distribution of hydrated and evaporitic minerals throughout the Martian landscape. Solutes could depress the melting point of water in a frozen Martian environment, providing a plausible solution to the early Mars climate paradox. Here we model the freezing and evaporation processes of Martian fluids with a composition resulting from the weathering of basalts, as reflected in the chemical compositions at Mars landing sites. Our results show that a significant fraction of weathering fluids loaded with Si, Fe, S, Mg, Ca, Cl, Na, K and Al remain in the liquid state at temperatures well below 273 K. We tested our model by analysing the mineralogies yielded by the evolution of the solutions: the resulting mineral assemblages are analogous to those actually identified on the Martian surface. This stability against freezing of Martian fluids can explain saline liquid water activity on the surface of Mars at mean global temperatures well below 273 K.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fairen, Alberto G -- Davila, Alfonso F -- Gago-Duport, Luis -- Amils, Ricardo -- McKay, Christopher P -- England -- Nature. 2009 May 21;459(7245):401-4. doi: 10.1038/nature07978.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, USA. alberto.g.fairen@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19458717" target="_blank"〉PubMed〈/a〉
    Keywords: Atmospheric Pressure ; Carbon Dioxide/analysis ; Extraterrestrial Environment/*chemistry ; *Freezing ; Ice/analysis ; *Mars ; Partial Pressure ; Salinity ; Transition Temperature ; Volatilization ; Water/*chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2009-08-29
    Description: Northern Hemisphere surface temperature reconstructions suggest that the late twentieth century was warmer than any other time during the past 500 years and possibly any time during the past 1,300 years (refs 1, 2). These temperature reconstructions are based largely on terrestrial records from extra-tropical or high-elevation sites; however, global average surface temperature changes closely follow those of the global tropics, which are 75% ocean. In particular, the tropical Indo-Pacific warm pool (IPWP) represents a major heat reservoir that both influences global atmospheric circulation and responds to remote northern high-latitude forcings. Here we present a decadally resolved continuous sea surface temperature (SST) reconstruction from the IPWP that spans the past two millennia and overlaps the instrumental record, enabling both a direct comparison of proxy data to the instrumental record and an evaluation of past changes in the context of twentieth century trends. Our record from the Makassar Strait, Indonesia, exhibits trends that are similar to a recent Northern Hemisphere temperature reconstruction. Reconstructed SST was, however, within error of modern values from about ad 1000 to ad 1250, towards the end of the Medieval Warm Period. SSTs during the Little Ice Age (approximately ad 1550-1850) were variable, and approximately 0.5 to 1 degrees C colder than modern values during the coldest intervals. A companion reconstruction of delta(18)O of sea water-a sea surface salinity and hydrology indicator-indicates a tight coupling with the East Asian monsoon system and remote control of IPWP hydrology on centennial-millennial timescales, rather than a dominant influence from local SST variation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppo, Delia W -- Rosenthal, Yair -- Linsley, Braddock K -- England -- Nature. 2009 Aug 27;460(7259):1113-6. doi: 10.1038/nature08233.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. doppo@whoi.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19713927" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atmosphere/analysis ; Calibration ; History, 15th Century ; History, 16th Century ; History, 17th Century ; History, 18th Century ; History, 19th Century ; History, 20th Century ; History, 21st Century ; History, Ancient ; History, Medieval ; Ice Cover ; India ; Indonesia ; Oceans and Seas ; Oxygen Isotopes ; Pacific Ocean ; Plankton/metabolism ; Rain ; Records as Topic ; Salinity ; Seasons ; Seawater/*analysis ; *Temperature ; Time Factors ; Tropical Climate ; Weather
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2009-07-17
    Description: Ice cores extracted from the Antarctic ice sheet suggest that glacial conditions, and the relationship between isotopically derived temperatures and atmospheric PCO(2) have been constant over the last 800,000 years of the Late Pleistocene epoch. But independent lines of evidence, such as the extent of Northern Hemisphere ice sheets, sea level and other temperature records, point towards a fluctuating severity of glacial periods, particularly during the more extreme glacial stadials centred around 340,000 and 420,000 years ago (marine isotope stages 10 and 12). Previously unidentified mechanisms therefore appear to have mediated the relationship between insolation, CO(2) and climate. Here we test whether northward migration of the subtropical front (STF) off the southeastern coast of South Africa acts as a gatekeeper for the Agulhas current, which controls the transport of heat and salt from the Indo-Pacific Ocean to the Atlantic Ocean. Using a new 800,000-year record of sea surface temperature and ocean productivity from ocean sediment core MD962077, we demonstrate that during cold stadials (particularly marine isotope stages 10 and 12), productivity peaked and sea surface temperature was up to 6 degrees C cooler than modern temperatures. This suggests that during these cooler stadials, the STF moved northward by up to 7 degrees latitude, nearly shutting off the Agulhas current. Our results, combined with faunal assemblages from the south Atlantic show that variable northwards migration of the Southern Hemisphere STF can modulate the severity of each glacial period by altering the strength of the Agulhas current carrying heat and salt to the Atlantic meridional overturning circulation. We show hence that the degree of northwards migration of the STF can partially decouple global climate from atmospheric partial pressure of carbon dioxide, P CO(2), and help to resolve the long-standing puzzle of differing glacial amplitudes within a consistent range of atmospheric PCO(2).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bard, Edouard -- Rickaby, Rosalind E M -- England -- Nature. 2009 Jul 16;460(7253):380-3. doi: 10.1038/nature08189.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CEREGE (UMR 6635), College de France, University Paul-Cezanne Aix-Marseille, CNRS, IRD, Europole de l'Arbois BP 80, 13545 Aix-en-Provence Cedex 4, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19606147" target="_blank"〉PubMed〈/a〉
    Keywords: Amoeba/metabolism ; Animals ; Antarctic Regions ; Atlantic Ocean ; Atmosphere/chemistry ; Carbon Dioxide/metabolism ; *Climate ; Cold Climate ; Cold Temperature ; Geologic Sediments/microbiology ; *Ice Cover ; Indian Ocean ; Oxygen Isotopes ; Pacific Ocean ; Partial Pressure ; Plankton/metabolism ; Salinity ; Seawater/chemistry ; South Africa ; Tropical Climate ; *Water Movements
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2009-11-27
    Description: The transport of warm and salty Indian Ocean waters into the Atlantic Ocean-the Agulhas leakage-has a crucial role in the global oceanic circulation and thus the evolution of future climate. At present these waters provide the main source of heat and salt for the surface branch of the Atlantic meridional overturning circulation (MOC). There is evidence from past glacial-to-interglacial variations in foraminiferal assemblages and model studies that the amount of Agulhas leakage and its corresponding effect on the MOC has been subject to substantial change, potentially linked to latitudinal shifts in the Southern Hemisphere westerlies. A progressive poleward migration of the westerlies has been observed during the past two to three decades and linked to anthropogenic forcing, but because of the sparse observational records it has not been possible to determine whether there has been a concomitant response of Agulhas leakage. Here we present the results of a high-resolution ocean general circulation model to show that the transport of Indian Ocean waters into the South Atlantic via the Agulhas leakage has increased during the past decades in response to the change in wind forcing. The increased leakage has contributed to the observed salinification of South Atlantic thermocline waters. Both model and historic measurements off South America suggest that the additional Indian Ocean waters have begun to invade the North Atlantic, with potential implications for the future evolution of the MOC.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Biastoch, A -- Boning, C W -- Schwarzkopf, F U -- Lutjeharms, J R E -- England -- Nature. 2009 Nov 26;462(7272):495-8. doi: 10.1038/nature08519.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Leibniz-Institut fur Meereswissenschaften, Dusternbrooker Weg 20, 24105 Kiel, Germany. abiastoch@ifm-geomar.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19940923" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Atlantic Ocean ; Computer Simulation ; Foraminifera ; Indian Ocean ; Salinity ; Seawater/*analysis/chemistry ; Temperature ; *Water Movements ; *Wind
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2009-07-17
    Description: Oceanic sediments from long cores drilled on the Lomonosov ridge, in the central Arctic, contain ice-rafted debris (IRD) back to the middle Eocene epoch, prompting recent suggestions that ice appeared in the Arctic about 46 million years (Myr) ago. However, because IRD can be transported by icebergs (derived from land-based ice) and also by sea ice, IRD records are restricted to providing a history of general ice-rafting only. It is critical to differentiate sea ice from glacial (land-based) ice as climate feedback mechanisms vary and global impacts differ between these systems: sea ice directly affects ocean-atmosphere exchanges, whereas land-based ice affects sea level and consequently ocean acidity. An earlier report assumed that sea ice was prevalent in the middle Eocene Arctic on the basis of IRD, and although somewhat preliminary supportive evidence exists, these data are neither comprehensive nor quantified. Here we show the presence of middle Eocene Arctic sea ice from an extraordinary abundance of a group of sea-ice-dependent fossil diatoms (Synedropsis spp.). Analysis of quartz grain textural characteristics further supports sea ice as the dominant transporter of IRD at this time. Together with new information on cosmopolitan diatoms and existing IRD records, our data strongly suggest a two-phase establishment of sea ice: initial episodic formation in marginal shelf areas approximately 47.5 Myr ago, followed approximately 0.5 Myr later by the onset of seasonally paced sea-ice formation in offshore areas of the central Arctic. Our data establish a 2-Myr record of sea ice, documenting the transition from a warm, ice-free environment to one dominated by winter sea ice at the start of the middle Eocene climatic cooling phase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stickley, Catherine E -- St John, Kristen -- Koc, Nalan -- Jordan, Richard W -- Passchier, Sandra -- Pearce, Richard B -- Kearns, Lance E -- England -- Nature. 2009 Jul 16;460(7253):376-9. doi: 10.1038/nature08163.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉[1] Department of Geology, University of Tromso, N-9037 Tromso, Norway [2] Norwegian Polar Institute, Polar Environmental Centre, N-9296 Tromso, Norway.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19606146" target="_blank"〉PubMed〈/a〉
    Keywords: Arctic Regions ; *Cold Climate ; Diatoms/chemistry/*isolation & purification/ultrastructure ; Fossils ; Geologic Sediments/microbiology ; History, Ancient ; Hydrogen-Ion Concentration ; Ice Cover/*chemistry/*microbiology ; Microscopy, Electron, Scanning ; Oceans and Seas ; Principal Component Analysis ; Salinity ; Seawater/chemistry ; Silicon Dioxide/analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2009-02-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Conley, Daniel J -- Paerl, Hans W -- Howarth, Robert W -- Boesch, Donald F -- Seitzinger, Sybil P -- Havens, Karl E -- Lancelot, Christiane -- Likens, Gene E -- New York, N.Y. -- Science. 2009 Feb 20;323(5917):1014-5. doi: 10.1126/science.1167755.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉GeoBiosphere Science Centre, Department of Geology, Lund University, Solvegatan 12, SE-223 62 Lund, Sweden. daniel.conley@geol.lu.se〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19229022" target="_blank"〉PubMed〈/a〉
    Keywords: Cyanobacteria/growth & development/metabolism ; *Ecosystem ; Eukaryota/growth & development/metabolism ; *Eutrophication ; Fresh Water/*chemistry/microbiology ; Geologic Sediments/chemistry ; Nitrogen/*analysis/metabolism ; Nitrogen Fixation ; Phosphorus/*analysis/metabolism ; Salinity ; Seawater/*chemistry/microbiology ; Water Microbiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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