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  • Biological production  (13)
  • Geodesy
  • Instituto Oceanográfico de la Armada, Guayaquil, Ecuador  (14)
  • Springer  (1)
  • 2005-2009  (15)
  • 1950-1954
  • 2008  (15)
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  • 2005-2009  (15)
  • 1950-1954
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  • 1
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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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  • 2
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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
    Repository Name: AquaDocs
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  • 3
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    Determinación del datum vertical en La Libertad, Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Normalmente en los levantamientos geodésicos se utilizan dos tipos de referencias: las coordenadas de origen y el datum vertical: Las primeras están en función del elipsoide o superficie matemática de referencia que más se ajusta al área, y el segundo; por la determinación del nivel medio del mar con 19 años de observación. El Ecuador tiene como elipsoide de referencia, el Internacional y el datum horizontal del punto localizado en la Canoa, Venezuela (Provisional South American Datum 1956, PSAD 56), cuya coordenadas han sido transportadas a nuestro país mediante redes geodésicas. En 1948, el Ecuador instaló una estación mareográfica en la Libertad (Lat. 020° 12'S., Long. 80° 55'W) y a la determinación del datum vertical se refiere el presente trabajo.
    Description: Incl. ref.bibl., grafs.
    Description: Published
    Keywords: Geodesy ; Datum levels ; Geodesy
    Repository Name: AquaDocs
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  • 4
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    Composición del plancton en la Puntilla Santa Elena durante agosto 2002 (Ecuador) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Esta investigación comprende los estudios del fitoplancton-zooplancton-ictioplancton, realizados en tres sitios de la Península Santa Elena durante agosto 2002, área designada para la proyección de "Arrecife Artificial de las Fuerzas Militares del Ecuador": un avión, barco y tanque de guerra, estructuras artificiales consideradas como basura chatarra (de gran tamaño), que serían recicladas para la bio-exploración artificiales hacia la seguridad de los recursos marinos del Ecuador. En el Estudio Ambiental se describen las consideraciones necesarias de carácter multidisciplinario (EIA-INOCAR, 2002).
    Description: The objective of the present study was to carry out a assess of plankton productivity nearest of the Puntilla Santa Elena, for the projection of future Artificial Reefs, carried out by the Oceanographic Institute of the Ecuadorian Navy, during august 2002. The investigated area presented high concentrations of primary and secondary productivity in the column of water (0-10m), with certain daily fluctuation characteristic of the trphic coastal systems that shows the circulation of the coastal currents and submarine topography. The main alimentary complements were the centric diatoms with high chlorophyll (Phytoplankton); the copepods and cladocera were the representative in the second level trophic (Zooplankton). It was a high diversity of fish eggs and larvae, information that would confirm that this sector is an spawn area for this month. The high diversity of crustaceans larvae, makes show off that the substrates of artificial reefs will be an attraction for crabs, shrimp and other crustaceans. Although the stadiums of sessile benthic organisms presented low density of briozoos larvae, cirrepedios, shells (bivalve mollusks and gastropods), they would be those that would populate the superficial layer of the new artificial structures. These marine organisms of the food chain constitute an excellent natural resource for fish and invertebrate organisms, consequently the artificial reefs would be favorable for the reception of the sessile organisms (as macroalgae and corals) and refuge area to alimentary support for other organisms like the fish.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Biological production ; Plankton ; Zooplankton ; Phytoplankton ; Artificial reefs ; Biological production ; Artificial reefs ; Plankton ; Zooplankton ; Phytoplankton ; Ichthyoplankton
    Repository Name: AquaDocs
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  • 5
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    Variabilidad temporal del fitoplancton en áreas costeras del mar ecuatoriano y su interrelación con el evento La Niña 1999-2000, Ecuador (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: La presente investigación tiene como objetivo conocer la variabilidad espacio temporal del fitoplancton y su interrelación con el evento La Niña 1999-2000 durante la época húmeda y seca considerando los parámetros ambientales: contajes celulares, abundancia relativa, en las estaciones fijas La Libertad y Manta.
    Description: Twenty four and twelve coastals stations were analyze in Manta during the event La Niña 1999 - 2000, graphic of the (with a net of 50u) and the relation with the parameters physical and quimical. The physical conditions during the development of "La Niña 1999-2000" event, were not continued as a defined pattern, showing particular characteristics for each region of the south Pacific ocean. In Ecuador was evidented that the biological productivity creased considerally in the Libertad during the year 2000 before evidencing the upwelling with chlorophyll nucleus creasing of the abundance relative. The main species with mayor cell density in the Libertad were Chaetoceros affinis, Rhizosolenia hebetata, R. stolterfothii, Thalassiosira subtilis, Leptocylindrus danicus. The species representatives in Manta were with mayor cell density in the three cruises were Hemiaulus sinensis, Rhizosolenia imbricata, Chaetoceros curvisetus, Ch. coarctatus, Dityllum brighTwelli which showed variability in their distribution, shaping high nucleus cells.
    Description: Incluye ref.bibl.,grafs.
    Description: Published
    Keywords: Biological production ; Phytoplankton ; Temporal variations ; Biological production ; Phytoplankton ; Upwelling ; Abundance ; El Nino phenomena ; Cell counters
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 6
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    Relación fitoplancton-zooplancton en el Pacífico Ecuatorial (Ecuador), durante septiembre 2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad científica.
    Description: The present research corresponds to the cruise carried out by the Oceanographic Institute of the Ecuadorian Navy in september 2001, between 89°W - 81°1W and 1°N - 3°3S. The distribution of plankton populations associated with upwelling areas of the coastal brunch of the Humboldt Current in the Gulf of Guayaquil, and toward the Galápagos, upwelling of the Cromwell Current, forming patches in the central region and toward the Gulf of Guayaquil, is decribed. Increased phytoplankton (diatoms) production was found south of the equatorial region, coincident with the presence of dinoflagellates species of warm-oceanic waters allowing slight mixed areas. The higher abundance of zooplankton (copepods) were found to the east of the Galápagos Islands, decreasing toward the continent. These bio-geographic conditions point to higher productivity areas to the south and lower productivity areas to the north of the studied area, characterized by the position of the equatorial front. A. patch the high biological productivity was also evidenced in the oceanic region, atypical condition associated to the global cooling of the La Niña event, and/ or advances of upwelling waters toward the continent, processes of great importance for the pelagic resources of Ecuador.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Biological production ; Geographical distribution ; Phytoplankton ; Zooplankton ; Population density ; Diatoms ; Phytoplankton ; Diatoms ; Zooplankton ; Biological production ; Upwelling ; Population density ; Cruises ; Abundance ; Geographical distribution
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  • 7
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    Bio-oceanografía en el entorno de la isla de La Plata, durante agosto/2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo de la presente investigación, fue dar un comprensivo entendimiento de las condiciones bio-oceanográficas del fitoplancton-zooplancton-ictioplancton, y las interacciones con el medio circundante (físico, químico), procesos que son complicados cuando involucran aspectos hidrográficos costeros como áreas de afloramiento, áreas de pesca y áreas de soporte alimentario para los diferentes recursos marinos costeros planctónicos-bentónicos y aves-mamíferos marinos.
    Description: The oceanographic Institute of the Ecuadorian Navy carried out a coastal cruise around La Plata Island in August 2001 onboard the R/V RIGEL. The main objective was to study the distribution and interaction of ecological variables affecting phyto-zooplankton and ichthyoplankton, as a tool for the evaluation of coastal marine resources. An important aspect is the bathymetry of the area influencing the biological component. Shallower waters are found southwards allowing the occurrence of upwelling and advection processes that bring nutrient rich waters to the surface. This is shown by the high chlorophyll "a" content found in the south, favorable for phyto- and zooplankton production, also abundant in that region. The cellular biomass was composed by species that are indicative of mixed waters, warm-oceanic and upwelling waters with increased abundance towards the south. The tendency of increased biological productivity in the southern margin of La Plata Island is coincident with other ecosystems such as the Galápagos Islands and Santa Clara Island. These southern areas area important ecological niches, i.e. birds and marine mammals, decisive for coastal marine resources support. It is of extreme importance to continue the vigilance and control of these areas, specially due to the negative effects that the proximity of commercial marine traffic may produce.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Marine resources ; Phytoplankton ; Zooplankton ; Biological production ; Marine ecology ; Marine ecology ; Phytoplankton ; Zooplankton ; Ichthyoplankton ; Upwelling ; Biological production ; Marine resources ; Cruises ; Oceanic islands ; Coastal zone
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  • 8
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    Distribución del fitoplancton y su comportamiento en el afloramiento en las Islas Galápagos (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los objetivos de este crucero han sido colectar información que permitirá comprender mejor la dinámica poblacional (cuali-cuantitativo) de las diferentes masas de aguas que afloran al este y al oeste de las Islas Galápagos y su interacción entre las islas, estos resultados permitirán dar una mejor apreciación sobre áreas de mayor fertilidad marina ( clorofila "a", contajes celulares), organismos indicadores del afloramiento y su posible asociación con áreas de riqueza ictiológica.
    Description: During the cruise COII99, that took place September the 20th until October the 8th of 1999, aboard the V/R ORION of the ecuadorian Navy, where collected samples for the estimate of chlorophyll were, as well as cells counts and indicators of the phytoplankton are analyzed in 20 oceanographic stations (89-92°W; 1°N-2°S). The average of chlorophyll "a" surface was of 0.250 mg/m³, the highest concentration was between 0.526- 0.529 mg/m³, westward of Isabela Island, associated with the upwelling of Cromwell;and other flow to the southeast of the Islands (90°W) associated with the Current of Humboldt, cue this match with the standards of these currents for the season, and they have an impact on the high biological productivity. The smallest concentrations were found in the north side of the Galapagos. 88 species were identified in water samples and 119 species in net samples. The diatoms were dominant, in low concentration Dinoflagelados, Tintínnidos, Cocolitofóridos, Cyanophytas, Microflagelados and Ciliados. pseudonitzschia delicatissima, Thalassiosira subtilis and Gymnodinium sp. they were species with greater cellular content in the sections 92°, 91°, 90° and 89°W, probably related to three different water masses ( equatorial subtropical surface, of Cromwell and Humboldt) that originated a greatdiversity of species in the insular ecosistem. The smaller biological productivity was registered northward of the study area, related to an increase in species of warm conditions Planktoniella sol, Rhizosolenia imbricata, Proboscia alata, Ceratium azoricum, C. tripos. C.trichoceros, C. fusus, C. teres, C. lunula, C.furca, C. vultur, C. pentagunum, Gonyaulax polyedra, Goniodoma polyedricum, Protoperidinium crassipes), indicating water masses with low content of chlorophyll "a" and nutrients.
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Keywords: Phytoplankton ; Biological production ; Chlorophylls ; Indicator species ; Population dynamics ; Phytoplankton ; Chlorophylls ; Biological production ; Indicator species ; Ichthyoplankton ; Cruises ; Population dynamics
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  • 9
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    Zooplancton en el estuario interior del Golfo de Guayaquil, durante mayo del 2001 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los objetivos del estudio son conocer la situación actual del zooplancton con la finalidad de conocer la composición, distribución y abundancia de las comunidades del zooplancton, resaltando las áreas de mayor productividad en el segundo eslabón de la cadena alimentaria. Establecer especies dominantes en la comunidad de quetognatos y su relación con los parámetros físicos en el estuario interior del Golfo de Guayaquil.
    Description: The present study reports in detail the distribution and composition of the zooplankton biomass in diferent places of the Gulf of Guayaquil and the main goal it is to know the areas of most productivity in the zooplankton. The most biomass of zooplankton was observed in the area of estuary Salado than in other areas in the study. The biomass was represented by microcrustacea the dominant group was Infra orden Brachiuran and it was observed the most at the station located in front of Quiñonez Island. The low zooplankton biomass was registered at the station located the area of the bridge ways around of Guayaquil city. The zooplankton community was represented by 17 taxa and 10 represented the Crustacea kind and it registered the most diversity at the estuary Salado and low diversity was observed at the bridge of ways around Guayaquil. The phylum Arthropoda showed a broad distribution and observed the abundance of insect larvae at Miraflores bridge it is not usually observed in the examples of zooplankton. The chaetognaths phylum showed that Sagitta bedoti was dominant and it may be considered a indicative changes on saltiness rate, in the area where the blend process between the Guayas River and Salado estuary happens.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Biological production ; Estuaries ; Distribution ; Biomass ; Zooplankton ; Salinity ; Composition ; Distribution ; Biomass ; Zooplankton ; Salinity ; Abundance ; Biological production ; Estuaries ; Estuarine organisms
    Repository Name: AquaDocs
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  • 10
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    Areas de mayor productividad biológica (clorofila "a") en el Pacífico Ecuatorial (82°W-92°W) durante 1988-1999 y su relación con eventos El Niño (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo de la presente investigación, fue diagnosticar las áreas de mayor productividad biológica en base a Clorofila "a" superficial y subsuperficial, durante la década 1989-1999 para la región del Pacífico Tropical (Ecuador).
    Description: During 1988-1999 were carried out 23 oceanographic cruise on board the B/I-ORION of the Instituto Oceanográfico de la Armada (INOCAR) in the Tropical Pacific Equatorial. The study area was a geographical location among 81°W-94°W y 2°N - 3.23°S of Ecuador. This data were contained by seasonal category, with a total of 23 cruises, 486 stations and 3187 data to chlorophyll sampling in 8 levels of depth (0, 10, 20, 30, 40, 40, 50, 75m). The results emphasized two areas of more productivity. 1) In Galapagos this upwelling were presented with the high biomass of chlorophyll 〉0.5 mg/m³, was presented toward the south region of Galapagos. Other nucleus of 1.5 mg/m³ among Island Isabela and Fernandina in dry seasonal. In the humid seasonal was registered two nuclei (1.0 mg/m³), a nucleus to the west of Galapagos associated with Cromwell Current and another nucleus to Island San Cristobal southeast possibly associated with a mixture of upwelling Cromwell and Humboldt. 2) In Gulf of Guayaquil: it is the high estuary in profile of the South American Pacific, present nuclei among 1 to 3 chlorophyll mg/m³. At level subsuperficial the biggest density was located among the 0 to at 30m of depth, condition that varies depending on the intensity of the area of mixtures of appeared waters and warm waters lightly. During events El Niño the chlorophyll biomass diminished with values 〈0.2 mg/m³, due to the discontinuity of the upwelling and/or masses of waters warm poor in nutrients. These areas of more biological productivity in chlorophyll "a" to they would be associated to the areas of more captures of fishing pelagic and of the Tuna.
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Keywords: Biological production ; Biomass ; Chlorophylls ; Biological production ; Chlorophylls ; Upwelling ; Biomass ; Water masses ; Nutrients (mineral) ; El Nino phenomena ; Cruises
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 11
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    Comunidades del plancton en la Caleta Aeolian de la Isla Baltra - Galápagos (Ecuador), durante 2005 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El propósito del trabajo es determinar la composición, abundancia de los grupos dominantes del fitoplancton y zooplancton, establecer las especies de Quetognatos y su relación con la temperatura superficial del mar durante marzo de 2005 correspondiente a la época húmeda.
    Description: During the study one collected superficial water samples in 12 stations distributed in the Aeolian Bay of the Baltra, Galapagos Islands to determine the primary productivity and secundary on the chain it would feed, the samples of plankton were collected during days 9 to the 13 of march of 2005. In relation to the biomass cellular one identified 24 species in the superface waterproof cloak and 84 species were determined in the samples of network of 50u. In the phytoplankton community, the diatoms prevailed dominant and in smaller concentration the dinoflagelados groups, silicoflagellates, cocolithoforids. In counts cells the dominant species in the area in study were Gymnodinium sp., Filamentos sp., Coscinodiscus excentricus, Thalassiotrix frauenfeldii. In the netwoork samples (50u), the typical water species were registered with high productivity characteristics; Corethron criophyllum, Chaetoceros peruvianus. As far as the zooplanktony productivity a greater biomass collected with the network of 335u in comparison with the network of 600u was determined, and it stands out that the hight biomass of zooplankton was in station 4. Additionally a proportional relation inversely between the abundances of Eggs of fish and taxa of Quetognatos was observed. As far as the species of Quetognatos the presence in abundance order was observed Sagitta neglecta, S. bedoti, S. pacifica, these species are typically of wet season.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Plankton ; Primary production ; Biological production ; Phytoplankton ; Zooplankton ; Biomass ; Plankton ; Primary production ; Biological production ; Phytoplankton ; Zooplankton ; Biomass ; Abundance ; Community composition ; Fish eggs ; Surface temperature
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  • 12
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    Larvas de peces clupeiformes y microzooplankton en la estación fija "La Libertad" desde noviembre de 1999 a julio del 2000 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Uno de los principales objetivos es la evaluación de los impactos que los eventos de El Niño tienen en las poblaciones del ictioplancton, con especial referencia a huevos y larvas de especies de interés comercial. Para el efecto se utilizan también, a más de los datos oceanográficos, especies de foraminíferos planctónicos como indicadores del estado del ecosistema. En el presente documento se detalla la distribución de larvas de Sardinops sagax (sardina), Ophistonema sp., Cetengraulis mysticetus (chuhueco), Anchoa y Engraulis ringens (anchoveta) durante el primer semestre del año 2000.
    Description: The present paper is the result of the analysis of ichthyoplankton samples colected ten miles off shore from Salinas - Península Santa Elena, since november 1999 until july 2000. During this period it has been found two points of high secondary productivity: in subsurface waters ( 0-50 m depth) during may, and in surface waters during march. The biomass of microzooplankton, eggs and fish larvae Engraulidae and Clupeidae were found in high quantity in these months mainly between the 0-50 m depth. The interrelation among planktonic foraminifers species: Globigerina bulloides, Globigerinoides ruber, Globigerinella aequilateralis, G. menardii, G. dutertrei and G. sacculifer, characterized the surface equatorial waters with the influence of cold waters of the Humboldt Current during this study, specially in march. Fish larvae like Anchoa sp., Anchovia (anchoa), Engraulis ringens (anchoveta) y Cetengraulis mysticetus (chuhueco), were identify since march to july. C. mysticetus was the most abundant specie. High diversity of zooplankton and fish larvae E. ringens and Opisthonema sp. (pinchagua) ocurred in may of 2000 also.
    Description: Incluye ref.bibl., grafs., tbls.
    Description: Published
    Keywords: Biological production ; Biomass ; Zooplankton ; Distribution ; Environmental impact ; Fish larvae ; Ichthyoplankton ; Biological production ; Biomass ; Zooplankton ; Distribution ; Fish eggs ; Fish larvae ; El Nino phenomena ; Environmental impact ; Fixed stations
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 13
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    Importancia ecológica del fitoplancton durante El Niño 1991-1993, en el Pacífico Ecuatorial (Ecuador) (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: El objetivo del estudio fue determinar su importancia ecológica y diversidad de los principales grupos del fitoplancton durante El Niño 1991-1992, en tres cruceros realizados en la época cálida-húmeda del ecosistema del Pacífico Ecuatorial (1991, 1992 y 1993).
    Description: Thirty one surface and twenty four sub-surface (50 m) oceanographic stations were analyzed during three cruises: December 1991, march 1992 and march 1993. During this period a strong "El Niño" 1991-92 event appeared. The physical conditions during the development of "El Niño 91-92" event did not present a defined pattern during the three cruises, showing particular characteristics for each studied region of the Equatorial East Pacific Ocean. Evidence that the phytoplankton decreased drastically in december 1991 was found approximately three months before the high temperatures of march 1992. However, the biological productivity in march 1992 increased, probably due to the development of an intense sub-surface upwelling. Later in march 1993, the anomalous "El Niño" conditions prevailed, with the higher chlorophyll layer deepened to approximately 40m, specially, in the south west of the studied area. The main species with high cell density in the three cruises were B. splendor-maris, P. sol, G. polyedricum, C. tripos, R. alata, R. hebetata. These species showed variability in their distribution, presenting nucleus of associated Diatoms and Dinoflagellates. These environment conditions allowed us to establish the existence of inter-specific components between generalist species (diatoms) and specialist species (dinoflagellates); both groups were eurithermic species during "El Niño 1991-93".
    Description: Incluye ref.bibl., ilus.
    Description: Published
    Keywords: Phytoplankton ; Biological production ; Marine ecology ; Chlorophylls ; Diatoms ; Marine ecology ; Phytoplankton ; Upwelling ; Chlorophylls ; Diatoms ; Biological production ; El Nino phenomena ; Oceanographic stations ; Multiship expeditions
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 14
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    Comunidades del zooplankton en los ríos Teaone, Esmeraldas, Terminal Petrolero y el balneario Las Palmas de Esmeraldas, durante el 2004 (2008)
    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Details
    Publication Date: 2021-05-19
    Description: Los estudios del zooplancton en diferentes áreas principalmente en el río Teaone, Esmeraldas y la zona marino costera frente a la ciudad que incluye, el área del balneario Las Palmas, en el último año se ha intensificado con el objetivo de obtener un conocimiento detallado de la presencia de estos organismos y las características físico-químicas que condicionan su abundancia y distribución.
    Description: The present study was carried out during the wet and dry seasons in the rivers Teaone, Esmeraldas, Petrolero Terminal and Palmas, for which stablished that a variability exists temporary space as for the abundance and composition of the communities zooplankton, especially the species of the taxa Chaetognatha, Cladocera, Caridea. The area of major productivity zooplanctónica associated with a high diversity was in the zone of Petrolero Terminal of Esmeraldas during the wet season. In the area Petrolero Terminal there was high abundance of Quetognatos's species represented by the dominancia of S. bedoti and S. neglecta in the wet season and during the dry season the dominancia was od S. enflata and S. minim which con be related principally by the seasonal variation of the parameter salinity, whereas the temperature was kept in a range of 25.9° to 28.4 °C during 2 season in study. The low zooplankton abundance and diversity registered in the river Teaone, there being registered the presence of scanty specimens of Macrobranchium rathbunae in the wet season. In the river Teaone were observed high values of potential of hydrogen in comparison with other areas in study, for what, it might catalogue that this area is in conditions of a deterioration of the quality of the waters, by light indications towards a pollution product of the antropogénica activities.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Description: freshwater environment
    Keywords: Zooplankton ; Biological production ; Water quality ; Salinity ; Hydrogen ; Species diversity ; Community composition ; Zooplankton ; Biological production ; Salinity ; Hydrogen ; Water quality ; Temporal variations ; Species diversity
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 15
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    VLNDEF Project for Geodetic Infrastructure Definition of Northern Victoria Land, Antarctica (2008)
    Springer
    Details
    Publication Date: 2022-05-30
    Description: Scientific investigations in Antarctica are, for many different reasons, a challenging and fascinating task. Measurements, observations and field operations must be carefully planned well in advance and the capacity of successfully meeting the goals of a scientific project is often related to the capacity of forecasting and anticipating the many different potential mishaps. In order to do that, experience and logistic support are crucial. On the scientific side, the team must be aware of its tasks and be prepared to carry out observations in a hostile environment: both technology and human resources have to be suitably selected, prepared, tested and trained. On the logistic side, nations, institutions and any other organisation involved in the expeditions must ensure the proper amount of competence and practical support. The history of modern Italian Antarctic expeditions dates back to the middle 80’s when the first infrastructures of “Mario Zucchelli Station”, formerly Terra Nova Bay Station, were settled at Terra Nova Bay, Northern Victoria Land. Only a few years later, the first geodetic infrastructures were planned and built. Italian geodetic facilities and activities were, ever since, being constantly maintained and developed. Nowadays, the most remarkable geodetic infrastructures are the permanent Global Positioning System (GPS) station (TNB1) installed at Mario Zucchelli and the GPS geodetic network Victoria Land Network for DEFormation control (VLNDEF) entirely deployed on an area extending between 71° S and 76° S and 160° E and 170° E. These facilities do not only allow carrying out utmost geodetic investigations but also posses interesting capacities on the international multidisciplinary scientific scenario. In order to fully exploit their potentiality, management and maintenance of the infrastructure are crucial; nevertheless, in order to perform high quality scientific research, these abilities must be coupled with the knowledge concerning a proper use and a correct processing of the information that these infrastructures can provide. This work focuses on the different methods that can be applied to process the observations that are performed with GPS technique in Northern Victoria Land, aiming at reaching the highest accuracy of results and assuring the larger significance and versatility of the processing outcomes. Three software were used for the analysis, namely: Bernese v.5.0, Gipsy/Oasis II and Gamit/Globk. The working data sets are (i) the permanent GPS station TNB1 observations continuously performed since 1998 and (ii) the five episodic campaigns performed on the sites of VLNDEF. The two infrastructures can be regarded as neat examples of standard geodetic installation in Antarctica. Therefore, the technological solutions that were adopted and applied for establishing the GPS permanent station and the VLNDEF geodetic network as well as the data processing strategies and the data analysis procedures that were tested on their observation will be illustrated in detail. The results will be presented, compared and discussed. Furthermore, their potentials and role in geodetic research will be carefully described; their versatility will also be highlighted in the foreground of a multidisciplinary Antarctic international scientific activity.
    Description: Published
    Description: 37-72
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: reserved
    Keywords: Antarctica ; Geodesy ; Geodetic Infrastructures ; GPS ; 01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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