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  • Internal waves  (40)
  • Coastal flows  (33)
  • Zooplankton  (33)
  • American Meteorological Society  (71)
  • Instituto Oceanográfico de la Armada, Guayaquil, Ecuador  (35)
  • 1
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Publication Date: 2021-05-19
    Description: Uno de los principales objetivos de esta investigación es contribuir al estudio del ictioplancton y zooplancton durante el evento El Niño 1997 en el Pacífico Sur Oriental y a la vez relacionar la abundancia, migración y distribución de los diferentes grupos de organismos con los parámetros de temperatura y salinidad, con respecto a la variación de la población del ictioplancton
    Description: In the initial part of the VII antarctic expedition, between Guayaquil-Valparaíso, on board vessel B/I Orion of ecuadorian navy in december 1998, zooplankton samples were collected through horizontal and oblique drags using nets bongo 500µm. The purpose of the later analysis was to determine the ichthyoplankton population in the South Eastern Pacific. No stations were done in peruvian water.Total amount of 6380 eggs (10m²)-1 and 2173 larvas (10m²)-1 were estimated from the analysis. The fish eggs belonging to 8 orders, 13 families and 1 genera, while 7 orders, 14 families and 20 genera of fish larvae were registered. The highest concentration of fish eggs was registered in tropical superficial waters masses (ATS), suntropical superficial (ASS) and coastal peruvian waters (ACP). The fish larvae were more abundant in chileans coastal waters, where equatorial subsuperficial water masses (AESS), subtropical subsuperficial (ASS), subantarctic (ASA) and peruvian coastal (ACP) waters found Sardinops sagax y Thunnus sp., larvae were recorded in the south west of Gulf of Guayaquil. There were also identification of two species related with tropical waters, de Benthosema panamense y Myctophum sp. The most representative families in the study ares were Bathylagidae, Gonostomatidae, Scombridae y Myctophidae with the genera Diogenichthys sp., Gonichthys laternatun, Gonichthys sp, Lampanycthus sp., related with tropical species from the west. The presence, migration and distribution of the ichthyoplankton suggest a direct relationship with the temperature of the study area. The temperature and salinity have directly influenced the showing up and distribution of the ichthyoplankton, showed a migration to the North of Chile that coincided with the temperature decreasing.
    Description: Incluye ref.bibl.,grafs., ilus., tbls.
    Description: Published
    Keywords: Geographical distribution ; Zooplankton ; Environmental factors ; Population dynamics ; Fish larvae ; Ichthyoplankton ; Zooplankton ; El Nino phenomena ; Geographical distribution ; Environmental factors ; Population dynamics ; Fish eggs ; Fish larvae
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 2
    Publication Date: 2021-05-19
    Description: En este estudio se examina la abundancia estructura poblacional y variación temporal del plancton, especialmente de copépodos en el Golfo de Guayaquil, a través de tres años de estudio, en condición no El Niño.
    Description: Changes on some oceanographic conditions as well surface planktonic community structure were studied during 33 months (December 1999- August 2002) at a fixed station in the Gulf of Guayaquil. Copepods, ostacods and decapod larvae were the most abundant zooplankton (300 µ mesh size) taxa, followed by fish larvae, chaetognaths, medusae, and mysidaceans. The lower abundance taxa were fish eggs, polychaeths, amphipods, pteropods, lamellibranch, cirriped larvae, and gasteropods. Phytoplankton was dominated by diatoms. The effect of the oceanographic variability on the zooplanktonic distribution, abundance, and population dynamics is unknown due to lack of appropriate continuity on sampling and analyses. The two most abundant copepod species were identified. Acartia danae dominated on the dry season, and Labidocera lubbocckii on the rainy season. Although, in general, copepod abundance was high, this diminished during the rainy seasons of 2000 (138-199 org/m3) and 2002 (175-327 org./m3), with relation to 2001 (1235-2238 org/m3). In march and april it was (6785 y 19887 org./m3). Ostracods, mainly Conchoecia sp., were relatively abundant (compared to copepods) and they were sometimes present in higher numbers. Decapods larvae were more abundand during the rainy season, specially in 2002. High abundance of copepods was find to be associated to lower water temperature, and decapod larvae, to higher temperatures. Diatoms were the main components of the phytoplankton community, with dominance of Skeletonema costatum, Coscinodiscus excentricus y Thalassiotrix frauenfeldii.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Population structure ; Plankton ; Phytoplankton ; Distribution ; Zooplankton ; Diatoms ; Fish larvae ; Plankton ; Phytoplankton ; Abundance ; Distribution ; Zooplankton ; Marine crustaceans ; Fixed stations ; Population structure ; Diatoms ; Fish eggs ; Fish larvae
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 3
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    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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  • 4
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    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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  • 5
    Publication Date: 2021-05-19
    Description: El presente trabajo trata de la distribución de la abundancia de huevos y larvas de peces en relación con la abundancia del zooplancton y fitoplancton colectado en 13 estaciones muestreadas a bordo del B/I TOHALLI durante el crucero pelágico-oceanográfico realizado en abril de 1995. Se analizó un total de 12820 huevos de peces. (10m²)¹ y 5145 larvas de peces (10m²)¹. La mayor abundancia de huevos y larvas de peces se localizó al este de las Islas Galápagos, en las estaciones 1P y 10, situadas en los extremos norte y sur del área de muestreo a la altura de la Isla San Cristóbal, con 5226 huevos (10m²)¹ y 1042 larvas (10m²)¹, respectivamente, mientras que la menor abundancia se localizó también al este de la Islas Galápagos, en las estaciones 7 y 5 con 109 huevos (10m²)¹ y 87 larvas (10m²)¹, respectivamente, y en las estaciones localizadas en el meridiano 83° W, frente a las provincias del Guayas y Manabí, con menos de 100 larvas (10m²)¹. Se reporta la presencia de larvas de Sardinops sagax en las estaciones cercanas a la Isla San Cristóbal. Huevos de Scomber japonicus y de engráulidos se identificaron cerca de esta isla. La familia ENGRAULIDAE se ausentó en el meridiano 83° W. Se identificaron larvas de peces pertenecientes a 17 familias, de las cuales, la familia MYCTOPHIDAE y GONOSTOMATIDAE fueron las más abundantes, representaron el 39% y 22% del total de larvas, respectivamente. Las áreas de abundancia de huevos y larvas estuvieron relacionadas con áreas de riqueza fito y zooplanctónica. Las mayores concentraciones de fitoplancton en aguas superficiales, más de 170000 células.m³, se dieron al este de Galápagos. Las menos concentraciones de fitoplancton se dieron en cambio a la altura del Golfo de Guayaquil, con 5000 células m³, lugar donde prosperó el zooplancton tanto en superficie como en profundidad, con 1800 y 2800 organismos.m³, respectivamente. Siguió en abundancia de zooplancton la zona norte de la Isla San Cristóbal tanto en superficie como en aguas profundas.
    Description: Incluye ref.bibl.,ilus.
    Description: Published
    Keywords: Phytoplankton ; Zooplankton ; Fish larvae ; Abundance ; Ichthyoplankton ; Phytoplankton ; Zooplankton ; Cruises ; Fish eggs ; Fish larvae
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 6
    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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  • 7
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    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
    Type: Journal Contribution
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  • 8
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    Instituto Oceanográfico de la Armada, Guayaquil, Ecuador
    Publication Date: 2021-05-19
    Description: Se analizaron 29 muestras de fondo en el presente estudio, entre las profundidades de 13 y 1958 m, colectadas durante el crucero R/V "Eastward", en octubre de 1976, (Tabla 1). Se identificaron un total de 11 especies del género Bolivina: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman & McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen & Earland; B. pseudobeyrichi Cushman, f. bradyi Asano; B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
    Description: Twenty nine bottom samples have been analized in this study, between 13 and 1598 m. of depth, that were collected in october 1976 during the oceanographic expedition R/V "Eastward". (Plate 1). Eleven species of genera Bolivina have been identified: B. acutula Bandy; B. alata (Seguenza); B. globulosa Cushman; B. interjuncta, f. typica Cushman; B. pacifica Cushman & McCulloch; B. plicata D'Orbigny; B. pseudoplicata Heron-Allen & Earland; B. pseudobeyrichi Cushman, f. bradyi Asano, B. subadvena serrata Natland; B. cf. spissa Cushman y B. tongi Cushman.
    Description: Incluye ref.bibl., ilus., tbls.
    Description: Published
    Keywords: Geographical distribution ; Zooplankton ; Foraminifera ; Geographical distribution ; Zooplankton
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 9
    Publication Date: 2021-05-19
    Description: El presente trabajo se basa en el estudio cuali-cuantitativo y de diversidad de 95 muestras de plancton colectadas semanalmente en aguas superficiales costeras en una estación fija localizada en Bahía Academia, Isla Santa Cruz (Galápagos) durante septiembre 1986-septiembre 1988. Se exponen 27 grupos de organismos de zooplancton, siendo los dominantes, los copépodos, larvas de decápodos, huevos de peces, lamelibranquios, ostrácodos, pterópodos y apendicularios; y los más frecuentes, copépodos, larvas de decápodos, huevos de peces, pterópodos, apendicularios, quetognatos, lamelibranquios y larvas de peces. Se determinan los diversos géneros de copépodos, siendo las especies más abundantes en orden decreciente: Acartia levenquei, Pseudodiaptomus galapaguensis y Nannocalanus minor. La temperatura superficial del mar (TSM) durante el período de análisis, mostró su valor más alto en abril 87, con 28,8°C y el más bajo en julio 88, con 19,2°C.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Zooplankton ; Coastal waters ; Temporal variations ; Zooplankton ; Coastal waters ; Surface temperature
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 10
    Publication Date: 2021-05-19
    Description: La presente investigación es parte del Convenio de Cooperación Técnica entre el Fondo Ecuatoriano Populorum Pregressio (FEPP) y el Instituto Nacional de Pesca (INP) y tiene como fin principal el estudio de huevos y larvas de chuhueco (Cetengraulis mysticetus), anchoas (Anchoa sp., Anchovia sp. y Engraulis) y pinchagua (Opisthonema sp.) en relación con abundancia y distribución de la microfauna zooplanctónica presente en los esteros durante el período comprendido entre abril del 2000 y diciembre del 2001.
    Description: This paper is about eggs and larval stages of Cetengraulis mysticetus (chuhueco), Engraulis, Anchoa sp., Anchovia sp. (anchovies) and Opisthonema sp., (pinchagua) research, and their relation with the micro zooplankton distribution collected in 22 stations located in the inner channels and coastal waters of Ecological Reserve Cayapas-Mataje (REMACAM) - Province of Esmeraldas, from april 2000 to december 2001. These fish larvae characterized the coastal and estuarine waters of Santa Rosa, Limones (C. mysticetus and Anchovia sp.) and Olmedo (Anchoa sp.) especially from august to december. Opisthonema sp. fish larvae characterized the northern zone of the REMACAM, in front of Campana town in the Mataje River on june 2001 and also in the central zone towards on a side of the Bolivar Channel, San Lorenzo and Isla de los Pájaros in Tambillo River on august and december 2001. The spawn of chuhueco fish and anchovies found on august and november 2001 increased in the inner channel of the north and central zone, from the mouth of the Mataje River, Canal de la Caida to San Lorenzo. Associated coastal processes to own oceanic conditions of "La Niña" event, during year 2000 and the tendency to a normalization of the marine ecosystem at the end of the 2001, they would be related to a greater micro zooplankton production (chaetognatha, copepoda, veliger larvae of mollusks, zoea of brachyuran) observed in the year 2000 and to reductions in the density of zooplankters and greater spawn of engraulis in the year 2001. The amount of phosphates nitrates and chlorophyll correlated positively with rises in the density of clupeiformes eggs and fish larvae.
    Description: Incluye ref.bibl., ilus., grsf.
    Description: Published
    Keywords: Zooplankton ; Eggs ; Larvae ; Mangroves ; Zooplankton ; Ichthyoplankton ; Eggs ; Larvae ; Mangroves
    Repository Name: AquaDocs
    Type: Journal Contribution
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