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  • 1
    Publikationsdatum: 2009-12-08
    Beschreibung: Phytoplankton--the microalgae that populate the upper lit layers of the ocean--fuel the oceanic food web and affect oceanic and atmospheric carbon dioxide levels through photosynthetic carbon fixation. Here, we show that multidecadal changes in global phytoplankton abundances are related to basin-scale oscillations of the physical ocean, specifically the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation. This relationship is revealed in approximately 20 years of satellite observations of chlorophyll and sea surface temperature. Interaction between the main pycnocline and the upper ocean seasonal mixed layer is one mechanism behind this correlation. Our findings provide a context for the interpretation of contemporary changes in global phytoplankton and should improve predictions of their future evolution with climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez, Elodie -- Antoine, David -- D'Ortenzio, Fabrizio -- Gentili, Bernard -- New York, N.Y. -- Science. 2009 Nov 27;326(5957):1253-6. doi: 10.1126/science.1177012.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UPMC University of Paris 06, UMR 7093, Laboratoire d'Oceanographie de Villefranche (LOV), 06230 Villefranche-sur-Mer, France. martinez@obs-vlfr.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19965473" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Atlantic Ocean ; Biomass ; Chlorophyll/*analysis ; *Climate ; *Ecosystem ; Global Warming ; Indian Ocean ; Oceans and Seas ; Pacific Ocean ; Phytoplankton/*physiology ; Population Dynamics ; Seasons ; *Seawater/chemistry ; Temperature ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2010-09-11
    Beschreibung: Fungal degradation of plant biomass may provide insights for improving cellulosic biofuel production. We show that the model cellulolytic fungus Neurospora crassa relies on a high-affinity cellodextrin transport system for rapid growth on cellulose. Reconstitution of the N. crassa cellodextrin transport system in Saccharomyces cerevisiae promotes efficient growth of this yeast on cellodextrins. In simultaneous saccharification and fermentation experiments, the engineered yeast strains more rapidly convert cellulose to ethanol when compared with yeast lacking this system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galazka, Jonathan M -- Tian, Chaoguang -- Beeson, William T -- Martinez, Bruno -- Glass, N Louise -- Cate, Jamie H D -- New York, N.Y. -- Science. 2010 Oct 1;330(6000):84-6. doi: 10.1126/science.1192838. Epub 2010 Sep 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California at Berkeley, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20829451" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Biofuels ; Biological Transport ; Biomass ; Cellobiose/metabolism ; Cellulase/metabolism ; Cellulose/*analogs & derivatives/*metabolism ; Dextrins/*metabolism ; Ethanol/metabolism ; Fermentation ; Fungal Proteins/genetics/*metabolism ; Genetic Engineering ; Kinetics ; Membrane Transport Proteins/genetics/*metabolism ; Neurospora crassa/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae Proteins/metabolism ; beta-Glucosidase/metabolism
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2014-03-22
    Beschreibung: John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age reduction in atmospheric carbon dioxide (CO2). In a sediment core from the Subantarctic Atlantic, we measured foraminifera-bound nitrogen isotopes to reconstruct ice age nitrate consumption, burial fluxes of iron, and proxies for productivity. Peak glacial times and millennial cold events are characterized by increases in dust flux, productivity, and the degree of nitrate consumption; this combination is uniquely consistent with Subantarctic iron fertilization. The associated strengthening of the Southern Ocean's biological pump can explain the lowering of CO2 at the transition from mid-climate states to full ice age conditions as well as the millennial-scale CO2 oscillations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez-Garcia, Alfredo -- Sigman, Daniel M -- Ren, Haojia -- Anderson, Robert F -- Straub, Marietta -- Hodell, David A -- Jaccard, Samuel L -- Eglinton, Timothy I -- Haug, Gerald H -- New York, N.Y. -- Science. 2014 Mar 21;343(6177):1347-50. doi: 10.1126/science.1246848.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geological Institute, ETH Zurich, 8092 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24653031" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Antarctic Regions ; Atlantic Ocean ; Atmosphere ; Biomass ; *Carbon Dioxide/analysis ; *Climate ; Cold Temperature ; Foraminifera/chemistry/metabolism ; *Geologic Sediments/chemistry ; *Ice Cover ; *Iron/analysis ; Nitrates/analysis/metabolism ; Nitrogen Isotopes/analysis ; Phytoplankton/growth & development/metabolism ; Seawater/chemistry ; Time
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2021-05-19
    Beschreibung: The occurrence of gurnard Prionotus stephanophrys was studied in the course of a series of fisheries research cruises on the Ecuadorian continental shelf between 1980 and 1985. The species is common in coastal waters south of 1°S . Its abundance is very variable, possibly associated with sea temperatures. Normally densities are between 0.8 and 1.6 t.km-2. The standing stock varies between 13,000 and 150,000 t wich it is estimated can sustain catches of around 4,000 t pet year, and up to 40,000 t in times of great abundance. P. stephanophyrs is found in large shoals on the bottom during the day but a night moves up into mid-water to feed on euphausids. The fish caught had size range of 12 cm to 37 cm, but the majority were between 16 cm and 21 cm in total length. The growth parameters and natural mortality were calculated. The present fisheries catch large quantities of these gurnards, but most is discarded at sea and the small amounts landed are only used for fish meal production. However, the flesh is of good quality and could easily be used for human consumption.
    Beschreibung: Published
    Schlagwort(e): Biomass ; Catch composition ; Biomass ; Abundance ; Catch composition ; Natural mortality
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2021-05-19
    Beschreibung: A survey of demersal fish resources of the Continental Shelf of Ecuador was carried out between October 1980 an July 1985 by the National Fisheries Institute of Ecuador, with British Technical Cooperation. This report deals with the stock assessment part of the work. In the course of seven cruises, 366 valid diurnal hauls were made with a high-opening bottom trawl. The demersal fish resources were estimated by swept area methods and the results are presented. The overall average standing stock of demersal fish was 78 000 t of which 22 000 t was good fish, but 36 000 t were gurnards (Triglidae) and 3 000 t of unusable fish. The main stocks were gurnards, grunts and croakers, sharks and corvinas Cynoscion spp. The southern areas especially the Gulf of Guayaquil had the highest densities of fish (9,6 t.Km-2 or 4,0 t.Km-2 excluding gurnards). There was a massive abundance of the gurnard, Prionotus stephanophys in 1984 and 1985. There was a general decrease and other changes in the demersal stocks due to the effects of the ”El Niño” in 1983.
    Beschreibung: Published
    Schlagwort(e): Demersal fisheries ; Geographical distribution ; Biomass ; Demersal fisheries ; Geographical distribution ; Abundance ; Biomass
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Unbekannt
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Publikationsdatum: 2021-05-19
    Beschreibung: Durante los meses de Marzo de 1983 a Febrero de 1984, se llevaron a cabo muestreos de 24 horas consecutivas en las fases llenas lunares en una estación fija en la región interior del Golfo de Guayaquil. Con esta información se han determinado variaciones mensuales y mareales del zooplancton, así como de otros parámetros ambientales, encontrándose una estrecha relación entre la abundancia de organismos y los valores de salinidad. La mayor biomasa planctónica estuvo asociada con los meses secos de alta salinidad. Analizando la variación mareal, se ha determinado que durante las mareas, existe aporte de material nutritivo desde el interior del estuario hacia la región exterior.
    Beschreibung: Incl. ref.bibl., grafs., ilus.
    Beschreibung: Published
    Schlagwort(e): Zooplankton ; Biomass ; Seasonal variations ; Zooplankton ; Biomass
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2021-05-19
    Beschreibung: Se determinó la biomasa del camarón rosado Farfantepenaeus notialis presente en el golfo de Ana María durante el periodo 1997-2010 mediante análisis estadístico de captura por edades (SCA). Esta se incrementó a partir del año 2008 como respuesta al aumento del reclutamiento, cuyo promedio anual presenta sus mayores valores en julio, noviembre y marzo. La entrada de reclutas (pre-adultos) al área de pesca ocurre por dos zonas principales, frente a los cayos de Ana María, y en Sta. Cruz Abajo, al norte de la porción sur de los cayos de las Doce Leguas. Una pesquería a finales del año puede provocar una sobrepesca del crecimiento y afectar la biomasa disponible para el siguiente año.
    Beschreibung: The biomass of the pink shrimp Farfantepenaeus notialis present in Ana María gulf during the period 1997-2010, was determined by means of statistical analysis of capture for ages (SCA). The biomass was increased from the year 2008 due to the increase of the recruitment, which shows its biggest average annual values in July, November and March. The recruitspre-adults arrival to the fishing area occurs by two main zones, in front of Ana María keys, and in Sta. Cruz Abajo, at North of the South portion of the Doce Leguas keys. A fishery at the end of the year may provoke an over fishing of the growth and to affect the available biomass for the following year.
    Beschreibung: Published
    Beschreibung: pre-adults, pink shrimp, Cuba
    Schlagwort(e): Biomass ; Recruitment ; Shrimp fisheries
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Unbekannt
    Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata
    Publikationsdatum: 2021-05-19
    Beschreibung: The seasonal variation of diversity, density and biomass of the main species of the bentho-demersal fauna present in the 'prawn-shrimp' fishing grounds in the coastal sector between Cabo Corrientes and Torreon del Monje, Mar del Plata (38 degree S-57 degree W), Argentina, was studied. The quali-quantitative information obtained allowed to know the fluctuations of the bentho-demersal components of the community. The study included the annual cycle between April 1998-April 1999. Monthly samples at different depths (4-10 m) and distance from the coast (500 and 1,000 m) were obtained in two stations using a bottom net. Sampling in each station lasted 15 minutes and covered 2,400 m super(2). Number of specimens and weight for each species were recorded. Abundance of species, density (individuals 100 m super(-2)), biomass (g 100 m super(-2)) were registered. The number of captured species, density and biomass fluctuated throughout the year. A total of 28,437 individuals corresponding to 8 taxa at Phylum or Class level were captured. A total of 66 different taxa at specific level (22 crustaceans, 19 fishes, 14 mollusks, 5 cnidarians, 3 polychaetes, one pygnogonid, one urochordate and one sponge) were caught. The bentho-demersal community studied is typical of a temperate marine environment where few taxa are dominant over a large number of occasional species. The prawn Artemesia longinaris (Penaeidae) was considered the dominant species (62% in number). Three other species were considered subdominant: juveniles of stripped weakfish Cynoscion guatucupa (Sciaenidae) accounting for 12.5%, sergestid Peisos petrunkevitchi (Sergestidae) for 10.1% and red prawn Pleoticus muelleri (Solenoceridae) for 3.5%. The remaining 11.8% corresponded to sixty-four occasional species that were 〈 2% in abundance each. Density ranged from 14 to 129 specimens 100 m super(-2) and biomass between 192-638 g 100 m super(-2). The Shannon-Wiener diversity index was statistically different between sampled stations and during the annual cycle. Mean annual diversity value for both stations was H'=2,151 bit/ind. Species diversity and variation in richness were found to be directly related to sea water temperatures during the annual cycle. This quali-quantitative information will be considered as base line to assess the environmental impact of different human activities (tourism, artisanal and commercial fisheries, discharge of agricultural, urban and industrial effluents, etc.) on the coastal ecosystem.
    Beschreibung: Published
    Beschreibung: Artemesia longinaris, Peisos petrunkevitchi, Pleoticus muelleri, Cynoscion guatucupa, camarón, langostino, pescadilla, zoobentos, abundancia, zona litoral, zonas de pesca, diversidad de especies, captura incidental,
    Schlagwort(e): Biomass ; Zoobenthos ; Fishing grounds ; Species diversity ; Zoobenthos ; Fishing grounds ; Biomass ; Abundance ; Littoral zone ; Species diversity ; By catch
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Format: 911554 bytes
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 2021-05-19
    Beschreibung: Para obtener una primera aproximación al conocimiento de las comunidades de macroalgas de los arrecifes de coral del archipiélago Sabana–Camagüey, se realizaron muestreos en 10 perfiles a lo largo del gradiente de profundidad, ubicados en los arrecifes de borde de plataforma de los cayos Sabinal, Guajaba, Confites, Coco, Paredón del Medio, Oeste de cayo Guillermo, Caimán Grande, Francés, Fragoso y Esquivel. En cada perfil se tomaron muestras de algas en cuatro estaciones situadas en la zona trasera del arrecife a 1 m de profundidad, y en el arrecife frontal a 5, 10 y 20 m de profundidad. Estas fueron tomadas con un colector hidroneumático circular de 0.07 m2 de área. Se encontraron 130 especies de algas. La mayor riqueza de especies se presentó en las estaciones de 5 m de profundidad del arrecife frontal. El predominio de las especies en la zona trasera y 20 m de profundidad del arrecife frontal fue heterogéneo, mientras que en 5 m de profundidad predominó la especie Cladophora catenata, y en 10 m Cladophora catenata y Microdictyon marinum. Las especies de mayor frecuencia de aparición en las cuatro profundidades fueron: Cladophora catenata, Anadyomene stellata, Microdictyon marinum, Halimeda tuna y Valonia ventricosa. La biomasa total varió con las localidades y la profundidad, pero fue mayor a los 5 m del arrecife frontal. Los altos valores de biomasa en toda la zona arrecifal parecen estar ocasionados por los altos niveles de nutrientes en el agua y la escasez de herbívoros.
    Beschreibung: With the purpose of obtaining a first approximation to the knowledge of coral reef macroalgae communities in Sabana-Camagüey Archipelago, 10 profiles along the depth gradients, located on the shelf border reefs were sampled in the keys Sabinal, Guajaba, Confites, Coco, Paredón del Medio, West of Guillermo, Gran Caimán, Francés, Fragoso and Esquivel. In each profile, algae samples were taken at four stations located in the rear zone at 1 m deep, and in the fore reef at 5, 10 and 20 m deep. A circular hydro-pneumatic collector with a 0.07 m2 area was used. A total of 130 algae species were found. The highest species richness was observed at 5 m deep on the fore reef. The predominant species in the rear zone and at 20 m deep on the fore reef varied among profiles; at 5 m depth the dominant species was Cladophora catenata, while at 10 m were Cladophora catenata and Microdictyon marinum. The most frequently occurring species in the four depths were: Cladophora catenata, Anadyomene stellata, Microdictyon marinum, Halimeda tuna and Valonia ventricosa. Total biomass varied with locations and depths, but was higher at 5 m deep on the fore reef. High biomass values in the whole reef zone seem to be caused by high levels of nutrients and herbivore scarcity.
    Beschreibung: Published
    Beschreibung: macroalgas, biomasa, estructura, zonación del arrecife
    Beschreibung: macroalgae, biomass, structure, coral reef zonation
    Schlagwort(e): Algae ; Biomass ; Coral reefs ; Algae ; Biomass ; Coral reefs
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Standort Signatur Erwartet Verfügbarkeit
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