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  • Biomass  (25)
  • Instituto Oceanográfico de la Armada, Guayaquil, Ecuador  (24)
  • American Chemical Society
  • Cell Press
  • 1
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    Fitoplancton en el afloramiento de las Islas Galápagos, durante Agosto 2000 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Esta investigación es parte del Proyecto Indicadores Biológicos de diferentes ecosistemas marinos del Ecuador, correspondiente a la región Insular de Galápagos durante agosto 2000, con el propósito de comprender la dinámica poblacional del fitoplancton (cuali-cuantitativo) de las diferentes masas de agua que afloran al este y oeste de Galápagos y entre las islas enfocando áreas de mayor fertilidad marina en la época seca.
    Description: This study corresponds to the cruise around the Galapagos Islands carried out by the Oceanographic Institute of the Ecuadorian Navy in August 2000. The purpose was to understand, quantitatively and qualitatively, the ecological dynamics of the phytoplankton during the dry season. The chlorophyll "a" data from surface waters registered high concentrations (0.87 - 2.18 mg/m3) southwest off the Galapagos Islands, reflecting upwelling processes. Sub-surface-water values were higher southward, while the lowest values were found to the north. Nuclei of high chlorophyll "a" content were found to the southwest of the Galapagos (10 m), and to the southeast (40-50 m). The cellular biomass was represented by P. delicatissima, species responsible for the high fertility in the center of the upwelling area and to the southwest and south off the Galapagos, Thalassiosira subtilis and Gymnodinium sp. were dominant to the east. The incidence of the Cromwell Current was accented toward 91° and 92°W; toward 89°W different conditions were shown, probably associated to the influence of the Humboldt Current. The biomass in 55µm mesh size fraction was dominated by P. delicatissima (0 m); P. delicatissima, C. compresus and C. curvisetus ( 0 - 50 m). C. tripos and G. polyedra, warm water species dominated to the north off the Galapagos in surface waters, while in sub-surface waters these species dominated to the southeast. This atypical behaviour was observed during the cruise of May 2000, when upwelling conditions were not evident.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Phytoplankton ; Biomass ; Chlorophylls ; Marine ecology ; Population dynamics ; Phytoplankton ; Chlorophylls ; Biomass ; Upwelling ; Marine ecology ; Water masses ; Population dynamics ; Cruises ; Oceanic islands
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 2
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    Procesos planctónicos en el Golfo de Guayaquil (Campo Amistad) julio-agosto/2001 (2014)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: This research is part of an environmental monitoring of plankton and its physical and chemical response around the platform located offshore Campo Amistad, near Santa Clara Island, southeast of the Gulf in external Guayaquil. The study was carried out between july 30 and augut 31-2001, onboard the R/V Orión of the Oceanographic Institute of the Ecuadorian Navy. The chlorophyll "a" biomass presented values between 0.6 and 1.52 mg/m3 in surface waters, with averages of 1.07 to 0.99 mg/m3 (10 m), 0.79 (20 m) and 0.58 (30 m) mg/m3. The larger amounts of biomass and daily variability were found in the northern part of the platform, while the opposite trend was observed in its western area. One hundred and three phytoplankton species were identified, with dominance of centric diatoms of mainly Skeletonema costatum and Chaetoceros curvisetus. Dinoflagellates presented high diversity and low biomass; Ceratium dens was the dominant species, characterizing influences of external water masses in the estuary. The zooplankton fauna was represented by 28 groups, with dominance of cladocera and copepods; the highest density of organisms was found around the 17h00 hours. High density of Cladocera presented a strong positive relationship to phytoplankton abundance, and a negative correlation to copepod abundance. The environmental conditions in the surface thermal structure were almost stable, with an average of 22.5°C. The lowest temperatures were found southwest of the platform (subsurface), coincident with a slight increase in nutrients (nitrate and silicate). The marine biota associated with these environmental conditions presented high diversity, implying the absence of eutrophication incidence in the estuary area of the platform.
    Description: Esta investigación es parte de un monitoreo sobre la situación ambiental del plancton y sus condiciones ambientales alrededor de la plataforma Amistad de Producción de Gas ubicada en el campo Amistad cerca de la Isla Santa Clara (Sureste del Golfo de Guayaquil externo), realizada entre el 30 de julio al 3 de agosto de 2001, abordo del B/I ORION del Instituto Oceanográfico de la Armada del Ecuador con un total de 12 estaciones. La biomasa clorofila "a" presentó valores superficiales entre 0.6-1.52 mg/m3, con promedios de 1.05 (10m), 0.79 (20m) y 0.58 (30m) mg/m3, la mayor biomasa y variabilidad diaria fue hacia el norte de la plataforma, ocurriendo lo contrario hacia el oeste. Se identificaron 103 especies fitoplanctónicas, con dominancia de diatomeas centricas principalmente por Skeletonema costatum y Chaetoceros curvisetus. Los dinoflagelados presentaron la mayor diversidad de especies y baja biomasa, Ceratium dens fue la especie dominante, caracterizando influencias de masas de aguas externas en el estuario. El zooplancton estuvo representado por 28 grupos, siendo dominantes cladóceros y copépodos; la mayor densidad de organismos fue hacia las 17h00 horas. La mayor densidad de cladóceros presentó una estrecha relación con la abundancia del fitoplancton, y los copépodos con su menor abundancia. Las condiciones ambientales en la estructura térmica superficial se presentaron casi estables entre 22.5°C, las menores fueron hacia el sudoeste de la plataforma (subsuperficial) coincidente con el ligero aporte de nutrientes (nitrato y silicato). Bajo estas condiciones se puede mencionar que en el entorno de la plataforma, la biota marina presentó gran variabilidad y no se registró incidencia de eutroficación.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Phytoplankton ; Chlorophylls ; Biomass ; Zooplankton ; Environmental assessment ; Producttion platforms ; Nutrients (mineral)
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 3
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    Diversidad del plancton en el estuario interior de Puerto Bolívar, Ecuador durante julio de 2002 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los objetivos del presente estudio son:- Establecer el estado actual del plancton en el estero Santa Rosa, estero Jambelí y río Jubones durante las fases de flujo y reflujo. - Determinar la productividad, dominación y diversidad del plancton presentes en el área de estudio.
    Description: During the study was colected samples water on superficial at 27 stations, it was distributed in the Port Bolívar stuary with maing goal it to know primary productivity. the samples of plankton was colected in two phases: flux and reflux during the days 3 to 18 of july-2002. The diversity phytoplankton was identified to method Uthermohl 88 species in the lawyer superficial and 96 species were determined in samples net of 50u. In the phytoplankton community the diatoms were dominant and lower concentration the dinoflagellates, silicoflagellates, cyanobacter and cocolithophorides. In cell count the species the most dominant at the area were Skeletonema costatum and Pseudonitzschia delicatissima, in the net (50u) samples were registered the stuarine and benthic species: Skeletonema costatum, Cyclotella menenghiniana. It was destacated that the most phytoplankton diversity found in the areas river Jubones and the Santa Rosa stuary during the phase flux. The zooplankton community was registered hight diversity of groups zooplanktonic with a total of 32 and 28 taxa during flux and reflux respectivetly and terms of diversity max was registered a 2.19 bits found in the estero Jambelí. The high biomas of zooplankton it was observed during reflux in the station 14 and the lower biomas. It was found during flux in the station 5 localited in the estero Santa Rosa. The ichthyoplankton was registered low abundance of eggs and lavals of fish in the study area, and determinated. The number max of diversity were 0.8 bits observed in the area Punta Jambelí and determinated in the group of eggs of fish the following familys: Clupeidae, Sciaenidae, Engraulidae and the larval of fishes the dominant family was Engraulidae.
    Description: Incluye ref. bil., grafs.
    Description: Published
    Keywords: Biological production ; Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Species diversity ; Species diversity ; Biological production ; Plankton ; Phytoplankton ; Zooplankton ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 4
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    Aspectos ecológicos del plancton en las riberas del humedal Isla Santay, Río Guayas durante los años 2000 y 2002 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo del presente estudio es conocer la distribución cualitativa y cuantitativa de las especies del fitoplancton, zooplancton e ictioplancton y su relación con las condiciones ambientales durante el período en estudio.
    Description: The present work includes/understands the study of the qualitative and quantitative temporary variability of the phytoplankton, zooplankton and ichthyoplankton in the shores of the Santay Island, of the Province of the Guayas. For the effect 16 samples, obtained during november of the 2000 and january of the 2002 were analyzed. 38 species of phytoplankton in water samples and 51 species in network samples were identified (50u). The diatoms were dominant and in smaller concentration the dinoflagellates ones, cianobacterys, silicoflagellates, and tintinides. The cellular biomass was represented mainly by Skeletonema costatum, Paralia sulcata and Coscinodiscus excentricus, species that were abundant in the study area. In network samples species were observed estuarys and benthicas: Actinoptychus senarius, Coscinodiscus excentricus, C. concinnus, Polymixus coronalis, Cyclotella menenghiniana, characteristic of a high fertility. During year 2000 a smaller zooplanctónica biomass with a variability in the abundance of the main groups of zooplancton appeared, standing out the dominant group the Larvae of Fish and represented by the sort Anchovy sp. and its temporary abundance is influenced mainly by the seasonal time, physical factors and states of tides. Wheres during year 2002 a greater zooplanctónica biomass was observed and greater diversity of species, this biomass was represented mainly by microcrustaceans such as Nauplios of cirripedios, Copépodos, Zoeas of brachiuras, Copépodos, Larvae of fish and Larvae of poliquetos, in comparison with year 2000. The abundance of a fraction of some groups of zooplankton pertaining to meroplancton is an index that mainly characterizes productive areas by the presence of larval estadíos of crustaceans and fish.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Biological production ; Species diversity ; Marine ecology ; Species diversity ; Plankton ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Biomass ; Abundance ; Biological production ; Marine ecology ; Temporal variations
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  • 5
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    Variación mensual y mareal del zooplancton en una estación fija del estero del Muerto, Golfo de Guayaquil (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: 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.
    Description: Incl. ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Zooplankton ; Biomass ; Seasonal variations ; Zooplankton ; Biomass
    Repository Name: AquaDocs
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  • 6
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    Composición y distribución de la biomasa del plancton en el frente ecuatorial (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Este trabajo presenta los resultados de la distribución de la biomasa y composición del fitoplancton y zooplancton en el frente ecuatorial, cuya presencia caracteriza las condiciones consideradas como "normal" para el sistema de circulación oceánica del Pacífico Tropical.
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Keywords: Distribution ; Biomass ; Phytoplankton ; Zooplankton ; Composition ; Distribution ; Biomass ; Cruises ; Phytoplankton ; Zooplankton
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  • 7
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    Distribución cuali-cuantitativa del fitoplancton en el Pacífico sureste (3°16'-31°23'S), durante El Niño 1997-1998 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo del presente artículo es estudiar la distribución de las concentraciones de clorofila "a" y feopigmentos en diciembre/97 y marzo/98, y cuales serían los indicadores biológicos del fitoplancton que han avanzado con la corriente cálida hacia el sur en diciembre/97, en condiciones de El Niño 97-98, en el Pacífico sudeste exceptuando la región peruana (Fig.1).
    Description: During the VII Ecuadorian Expedition to Antarctic in the Guayaquil - Valparaíso - Guayaquil route (december/97 - march/98), oceanographic stations were performing to register cuali-cuantitative variations of phytoplankton of Southeastern Pacific Ocean during "El Nino" 1997-98 conditions. The biomass of phytoplankton is measured chlorophylls "a" levels showed lower concentrations between 0.015-04 mg/m³ to the 100m depth. The phytoplankton composition in december/97, registered the most dominance of diatoms at southward Gulf of Guayaquil with lower concentration at 20° S, the main species were Chaetoceros affinis, Skeletonema costatum, Rhizosolenia imbricata, Ch, leavis, R. alata var curvirrostris, Climacodium biconcavum, R. styliformis. The dinoflagellates species had the widest distribution in the area studied (3°16'-31°23'S) with rank of temperature between 27.54°C and 17.67°C, were Ceratium incisum, C. carriense, C. breve, C. teres, C. falcatiforme, C. euuarcuatum, C. pavillardi, Dinophysis caudata, Ornithocercus steinii, O. Thumi, O. magnificus, Pyrocystis fusiformis, Protoperidinium quarnerense, P. cf conicum, P. longipes, P. ocanicum, P. pedunculatum, Prorocentrum micans, Podolampas bipes, and some Epiplocides reticulata, Eutintinnus lusussundae, was indicators of oceanic waters advanced to chilean area. At to 30° S, the dinoflagellates were most dominant groups, with C. tripos, C. furca, C. pentagonum var subrrostrum, Goniodoma polyedricum, G. polygramma, species.
    Description: Incluye ref.bibl., grafs., ilus.
    Description: Published
    Keywords: Distribution ; Phytoplankton ; Biomass ; Diatoms ; Chlorophylls ; Distribution ; Phytoplankton ; Biomass ; Community composition ; Diatoms ; El Nino phenomena ; Oceanographic stations ; Chlorophylls
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 8
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    Distribución del primer nivel trófico (fitoplancton) en el Pacífico ecuatoriano, período 1996-1997 (pre-El Niño) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Este artículo describe las condiciones bio-oceanográficas del primer nivel trófico, distribución y concentración de la biomasa fitoplanctónica (clorofila "a") y contajes celulares) a nivel superficial y subsuperficial de la capa fótica a los 75 m. de profundidad, se da la distribución de especies indicadoras del fitoplancton y su relación con las variables de temperatura y nutrientes, registrados en tres cruceros oceanográficos realizados en octubre/1996, abril-mayo/1997 y agosto/1997.
    Description: Published
    Keywords: Distribution ; Biomass ; Phytoplankton ; Trophic levels ; Chlorophylls ; Indicator species ; Distribution ; Biomass ; Chlorophylls ; Phytoplankton ; Indicator species ; El Nino phenomena ; Trophic levels ; Multiship expeditions
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 9
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    Distribución del fitoplancton en la región costera del mar ecuatoriano, durante diciembre 2000 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: La presente investigación describe el comportamiento del primer nivel trófico (clorofila, feopigmentos, biomasa celular e indicadores del fitoplancton) en el ecosistema costero del mar ecuatoriano, conocer la incidencia de las principales especies que se encuentran formando núcleos de mayor productividad e inter-relacionadas con las condiciones ambientales durante el Crucero realizado en diciembre/2000.
    Description: This study was carried out during December 2000, onboard the R/V Orion of the Oceanographic Institute of the Ecuadorian Navy. The objetive was to establish the relationship between chlorophyll "a" content and the abundance of species or groups of species of micro-algae inside a region with ocean-climate system variability in the Tropical Pacific Ocean along the Ecuadorian coast. The highest chlorophyll content was found between 1°3 S and 3°S, with a positive correlation to the cellular biomass, including species of phytoplankton such as Rhizosolenia stoltherfothi, Thalassiosira subtiles, Pseudonitzschia delicatissima, P. longissima, Leptocylindrus danicus, Gymnodinium sp., y Messodinium rubrum. However, the biomass calculated from the content of the 55 µm mesh size was dominated by Rhizosolenia imbricata, T. subtiles, Chaetoceros affinis, L. danicus, Chaetoceros curvisetus. The dinoflagellates showed concentrations of species that characterized zones of warm water masses (Protoperidinium crassipes, Gonyaulax polyedra, Dinophysis caudata towards the NE, and C. tripos, G. polyedricum, C. furca towards the SE of the study area). The phytoplankton distribution did not reflect the position of the Equatorial Front, determined as an almost zonal phenomenon with a weak surface thermal gradient (23-25°C). The high abundances of M. rubrum and Gymnodinium sp., might have been related to the influence of the cold Humboldt Current and this may have produced some "red tide" events towards the coastal margin.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Distribution ; Phytoplankton ; Biomass ; Chlorophylls ; Indicator species ; Distribution ; Phytoplankton ; Chlorophylls ; Biomass ; Indicator species ; Cruises
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 10
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    Composición, distribución y abundancia del plancton en el estuario de San Lorenzo, Esmeraldas - Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al estudio del plancton estuarino presente en el área comprendida del Canal de San Lorenzo, provincia de Esmeraldas, para lo cual existe poca información sobre este tema.
    Description: The present work comprehends the study of the qualitative and quantitative distribution of the phytoplankton, zooplankton and ichthyoplankton at San Lorenzo in Esmeraldas Province. For the effect 12 stations were established located at the Estero Chimbusal, Estero Nadadero, Canal de San Lorenzo. The sample was taken in the phases flow and refflux the days ist and 2nd of september 2001. There were identified 63 species in water samples and 77 species in samples with net of 50u in the community of the phytoplankton. The diatoms prevailed dominant and in smaller concentration the dinoflagellates, tintinnoids, cianobacters and flagellates. The cell biomass was represented by Messodinium rubrum and Chaetoceros compressus, they were the most abundant species in all the area. In net samples of 50u the dominant species were: Biddulphia sinensis, B.mobiliensis, Chaetoceros compressus, Pleurosigma angulatum and Skeletonema costatum, tytical of a high fertility in the area. The regimen refflux registered 17 taxas of zooplankton an the dominants were Copepods (35%), Chaetognaths (34%) and the Crustacean Larvae such as Zoeas of Brachyuran (11%). The regimen flow showed 14 taxas and were evident the Copepods (60%), Fish Larvae (21%) these groups of zooplankton were considered dominant and frequent. With regard to Ichthyoplankton registered in the regimen flow 3462 fish eggs/10m², the dominant families were Engraulidae (62%), Clupeidae (33%), however it was observed a high abundance of fish larvae with a total 11495/ 10m² and registered the dominant families Clupeidae (40%), Engraulidae (37%) and Scianidae (16%). The regimen refflux presented the biggest abundance on eggs of fish with 19649 eggs/ 10m². The dominant families were Clupeidae 68% and Engraulidae 31%, the fish larvae were low on abundance with 826 larvas/10m² being the dominant families Clupeidae (57%), Scianidae (24%) and Engraulidae (14%).
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Distribution ; Plankton ; Phytoplankton ; Zooplankton ; Biomass ; Diatoms ; Distribution ; Composition ; Abundance ; Plankton ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Diatoms ; Biomass
    Repository Name: AquaDocs
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