SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Procesos planctónicos en el Golfo de Guayaquil (Campo Amistad) julio-agosto/2001

Arcos, F.; Bonilla, M.A..

En el presente trabajo se analizan cuantitativamente y cualitativamente los componentes del zooplancton colectado en 23 estaciones del Estrecho Bransfield, determinando la distribución de la abundance relativa de cada grupo. Se nota una mayor abundancia de zooplancton al norte del estrecho y un predominio de Copépodos y Eufáusidos; estos últimos fueron recolectados principalmente en estadíos larvarios, y la presencia de gran cantidad de huevos en el extremo sur-oriental del estrecho sugiere un aporte de estos organismos provenientes del mar de Weddell.

Tipo: Journal Contribution

Palavras-chave: Zooplankton; Abundance; Distribution records; Antarctic zone; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_15490.

Ano: 1989

URL: http://hdl.handle.net/1834/3827

Distribución del plancton a mesoescala en un área de reproducción de la anchoíta en la plataforma bonaerense

Torres, G.; Calderón, T.; Mero, M.; Franco, V..

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...

Tipo: Journal Contribution

Palavras-chave: Phytoplankton; Chlorophylls; Biomass; Zooplankton; Environmental assessment; Producttion platforms; Nutrients (mineral).

Ano: 2003

URL: http://hdl.handle.net/1834/5762

Estudio de la composición específica, abundancia y distribución espacial del microzooplancton (protozoos y micrometazoos) en el estuario del Río de la Plata (Argentina-Uruguay)

Akselman, R.; Carreto, J.I.; Ramirez, F.C..

In order to determine the distribution patterns of phytoplanktonic and zooplanktonic species that constitute the main food of the argentine anchovy (Engraulis anchoita), a study was made within a coastal spawning area on meso-scaled space (approximately 7 miles between stations). It was observed the predominacne of the copepod Oithona helgolandica and copepodites stages of other small-sized species, thus inferring the preponderance of nauplii stages which constitute the main food of early anchovy larvae. A high spatial heterogeneity was found in the distrtibution of both phytoplanktonic and zooplanktonic communities. Phytoplankton showed a patchiness distribution both in horizontal and vertical directions. Diatoms, dinoflagellates and coccolithophoirids...

Tipo: Journal Contribution

Palavras-chave: Phytoplankton; Zooplankton; Trophic relationships; Population density; Horizontal distribution; Species diversity; Phytoplankton; Zooplankton; Species diversity; Population density; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_6112.

Ano: 1986

URL: http://hdl.handle.net/1834/2034

Evaluation de la contamination chimique par les métaux traces (Cd, Pb, Hg et Zn) du zooplancton et de la sardinelle <Sardinella aurita>dans le golfe de tunis

Kogan, M..

Species composition, abundance and spatial distribution of microzooplancton (20-200 km)from the Río de la Plata Estuary, Argentina-Uruguay, SW Atlantic (36°S 56°W)were studied from samples collected during two oceanographic cruises at the end of austral spring (in 1999 and 2001)across a gradient from fluvial to coastal waters (200 km). Heterotrophic dinoflagellates, aloricate ciliates, tintinnids, radiolarians, rotifers and copepod nauplii were found. More than 110 taxa were registered, 35 were new records for the area. Three microzooplanktonic assemblages were distinguished using cluster analysis. Species and groups spatial distribution (horizontal and vertical)was related to the distribution of the maxima gradients (salinity, turbidity, etc.), estuarine...

Tipo: Theses and Dissertations

Palavras-chave: Zooplankton; Abundance; Geographical distribution; Salinity stratification; Ecological associations; Brackishwater environment; Community composition; Vertical distribution; Zooplankton; Geographical distribution; Ecological associations; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_1050.

Ano: 2005

URL: http://hdl.handle.net/1834/2598

Ennouri, R.; Chouba, L.; Kraeim, M.M..

La présente étude a pour but de déterminer l’organotropisme de quatre métaux traces (Cd, Pb, Hg et Zn) ainsi que leurs concentrations dans le zooplancton et dans trois organes (muscle, foie et branchies) de la sardinelle (Sardinella aurita) provenant du golfe de Tunis. Les résultats ont montré que les concentrations moyennes des quatre métaux dosés (Cd, Pb, Hg et Zn) sont plus élevées dans la sardinelle que dans le zooplancton. Ceci est dû à la bioamplification de ces éléments dans la sardinelle qui occupe un niveau trophique élevé de la chaîne alimentaire marine. Pour le Pb, le Hg et le Zn, les teneurs le plus élevées ont été enregistrées dans les branchies de la sardinelle, alors que le Cd est concentré davantage au niveau du foie. Les concentrations...

Tipo: Journal Contribution

Palavras-chave: Bioaccumulation; Marine pollution; Pollution indicators; Trace elements; Zooplankton; Sardinella aurita; Bioaccumulation; Zooplankton; Sardinella aurita; Trace elements; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_39038; Http://aims.fao.org/aos/agrovoc/c_7834.

Ano: 2008

URL: http://hdl.handle.net/1834/3707

Micromundo marino

Estudio de las comunidades del fitoplancton y zooplancton en Monteverde, Península de Santa Elena, Ecuador durante noviembre de 2006

Montolio, M..

De forma amena y muy didáctica se aborda la historia, la distribución, la diversidad, la supervivencia, la colecta de especies del plancton. Se incluyen ¿ sabías qué ? para mostrar los aspectos más interesantes y para comprobar conocimientos los juegos didácticos.

Tipo: Book

Palavras-chave: Zooplankton; Phytoplankton; Plankton; Nannoplankton; Zooplankton; Phytoplankton; Plankton; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_5950.

Ano: 2005

URL: http://hdl.handle.net/1834/2081

Monitoreo de las condiciones bio-oceanográficas en la I y II Regiones, año 2002

Tapia, M.E.; Naranjo, Ch..

El presente estudio se efectuó frente a la localidad de Monteverde, Península de Santa Elena, monitoreándose un total de 15 estaciones durante los estados de marea de flujo y reflujo en noviembre de 2006. Las mayores concentraciones de clorofila a: Se observó en la estación 9 en la capa superficial con valores de 0.90 mg/m3 determinándose como un área de mayor productividad y la menor concentración se registró en la estación 4 con valor de 0.10 mg/m3 durante la fase de flujo. En la comunidad fitoplanctónica se determinó dos áreas de mayor diversidad y abundancia de especies: La primera se observó en las estaciones 4 y 6 durante flujo registrándose la mayor abundancia relativa, la segunda corresponde a las estaciones 10 y 11 en reflujo. Se destaca la...

Tipo: Journal Contribution

Palavras-chave: Chlorophylls; Phytoplankton; Zooplankton; Biomass; Aquatic communities; Phytoplankton; Zooplankton; Biomass; Aquatic communities; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_553; Http://aims.fao.org/aos/agrovoc/c_1577.

Ano: 2009

URL: http://hdl.handle.net/1834/3348

Caracterización cuantitativa y cualitativa del zooplancton en la Ensenada de la Broa

Braun, M.; Reyes, H.; Valenzuela, V.; Castillo, J.; Osses, J.; Catasti, V..

El presente documento corresponde al pre-informe final del Proyecto FIP 2002-01 Monitoreo de las condiciones bio-oceanográficas fisico-químicas; la distribución geográfica y abundancia de huevos y larvas de los recursos anchoveta, sardina, jurel y caballa y su variabilidad estacional; y la distribución de los recursos detectados por medio de técnicas hidroacústicas en la I y II Regiones, registradas durante los cruceros estacionales de monitoreo MOBIO 0205, MOBIO 0209, MOBIO 0212 y MOBIO 301, realizados en otoño, invierno y primavera de 2002 y verano de 2003 respectivamente. Entrega además la serie de tiempo mensual generada producto de la ocupación de las estaciones costeras de vigilancia localizadas frente a los puertos de Mejillones, Iquique y Arica...

Tipo: Report

Palavras-chave: Physical oceanography; Water temperature; Salinity; Dissolved oxygen; Marine ecology; Seasonal variations; Echo surveys; Geographical distribution; Zooplankton; Physical oceanography; Water temperature; Dissolved oxygen; Geographical distribution; Zooplankton; Salinity; Marine ecology; Http://aims.fao.org/aos/agrovoc/c_5830; Http://aims.fao.org/aos/agrovoc/c_16063; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_4609.

Ano: 2004

URL: http://hdl.handle.net/1834/1728

on the distribution of zooplankton assemblaces in abu-qir bay, alexandria, egypt

González, E.; Alfonso, I..

Se presentan los resultados obtenidos de una caracterización cuantitativa y cualitativa del zooplancton de la Ensenada de la Broa durante 9 cruceros de investigación, efectuados en el periodo de abril 1979 a febrero de 1980. Los meses de junio a julio resultaron los de mayor abundancia, con densidades promedios de de más de 3000 organismos por m¯ ³. Se reporta diferencia significativa entre las medias de concentración de organismos correspondientes a los meses: diciembre, enero, febrero y el resto de los meses. Se señala a la zona más productiva de la Ensenada de la Broa a la comprendida entre Playa Rosario y la Tasajera. Con más de 2 700 org./ m¯ ³.

Tipo: Journal Contribution

Palavras-chave: Zooplankton.

Ano: 1982

URL: http://hdl.handle.net/1834/4871

El zooplancton de las Islas Galápagos

Zakaria, H.Y..

Abu Qir Bay is a shallow semi-circular basin lying 35 Km east of Alexandria city. The bay is facing the problem of pollution which discharged into the bay from different sources; El-Tabia Pumping Station (TPS), the outlet of Idku Lake and the Rosetta mouth of the Nile River. Quantitative and qualitative studies of zooplankton community in Abu Qir Bay were performed seasonally during 2004. Fourteen stations were selected to represent the different habitats in the bay.The seasonal variations of zooplankton standing stock in Abu Qir Bay indicated that, the highest count (average 87.1x103 ind/m3) occurred during spring, while the lowest (average 44.2x103 ind/m3) was recorded in summer. The average zooplankton count during the period of study amounted to...

Tipo: Journal Contribution

Palavras-chave: Field Study; Zooplankton; Coastal waters; Zooplankton; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_25205.

Ano: 2007

URL: http://hdl.handle.net/1834/1900

Variación de la población del ictioplancton en el Pacífico Sur Oriental durante diciembre de 1997

Bonilla, D..

El presente trabajo es el resultado de un análisis cuali-cualitativo de 84 muestras de plancton colectadas en aguas costeras (10.-0 m de profundidad) en diez localidades de las Islas Galápagos entre Agosto de 1975 - Julio de 1976. Se da a conocer 29 grupos de organismos del zooplancton, determinándose que los grupos dominantes en las estaciones objeto de este estudio y en orden decreciente de su abundancia fueron: Copépodos, Pterópodos, Apendiculares, Quetognatos, Decápodos y Huevos de Peces. Se hacen evaluaciones del volumen de plancton y de la cantidad de organismos del zooplancton. Se detrmina que la distribución del zooplancton fue poco homogénea en las localidades estudiadas. mayores concentraciones se registraron hacia la parte central del...

Tipo: Journal Contribution

Palavras-chave: Zooplankton; Coastal waters; Geographical distribution; Abundance; Zooplankton; Geographical distribution; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_25205.

Ano: 1983

URL: http://hdl.handle.net/1834/2120

Composición del plancton en la Puntilla Santa Elena durante agosto 2002 (Ecuador)

Ortega, D..

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

Tipo: Journal Contribution

Palavras-chave: Ichthyoplankton; Zooplankton; El Nino phenomena; Geographical distribution; Environmental factors; Population dynamics; Fish eggs; Fish larvae; Geographical distribution; Zooplankton; Environmental factors; Population dynamics; Fish larvae.

Ano: 1998

URL: http://hdl.handle.net/1834/2291

Results of the Environmental Impact Assessment for the Saltpond Offshore Programme -Plankton Baseline Study

Torres, G.; Calderón, G.; Franco, V.; Cedeño, E.; Calderón, T.; Salazar, E..

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).

Tipo: Journal Contribution

Palavras-chave: Biological production; Artificial reefs; Plankton; Zooplankton; Phytoplankton; Ichthyoplankton; Biological production; Plankton; Zooplankton; Phytoplankton; Artificial reefs; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_25395.

Ano: 2004

URL: http://hdl.handle.net/1834/2343

Interpretation of particle spectra of electronic counters by microscopical methods

Yaqub, B.H..

A report on plankton baseline studies conducted in the Saltpond Oil Field, Ghana.

Tipo: Report

Palavras-chave: Phytoplankton; Zooplankton; Plankton; Ichthyoplankton; Offshore; Salt water; EIA (environmental impact assessment); Salt water; Plankton.

Ano: 2013

URL: http://hdl.handle.net/1834/5326

Bakker, C.; Prins, T.C.; Tackx, M.L.M..

1. Using monocultures or single species dominated natural phytoplankton, cell counts and volume estimations obtained by visual and electronic methods show reasonable agreement.Calibration seems possible (Figs.1-2).2. Further examples given (Fig. 3-4) show that microscopical identification of the volume peaks in electronic counter spectra of natural seston is not quite simple. Phytoplankton peaks may not be detected in the Counter spectrum. Shifts of Counter peaks to the left side of the visual spectrum may be found when cylindrical, elongated or needle- like phytoplankton dominate the sample.3. Both visual and electronic methods include potentially large errors. Possibly particle volume is either overestimated by the microscope and / or underestimated by...

Calculations of results in grazing experiments using the counting method

Palavras-chave: Detritus; Grazing; Measuring devices; Particle counters; Particle size; Phytoplankton; Zooplankton.

Ano: 1985

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3195

Tackx, M.L.M.; Van de Vrie, E.M..

Different formulae used in the literature for calculation of ingestion rates are reviewed. Their applicability is discussed in relation to two criteria: the occurrence of saturation of the feeding and/or growth of the food particles. It is shown by simulations that the differences in results obtained by calculating ingestion following a linear or an exponential model are restricted to a few percent. Calculation of ingestion rates by substantial over- or underestimation depending on the growth constant of the food particles and the grazing time.The formula I = Vk(CztCzoekt)/N(I-ekt) is proposed for the calculation of ingestion rates under saturated circumstances.It...

Transfer of seston to zooplankton in marine ecosystems

Palavras-chave: Food intake; Food intake; Grazing; Ingestion; Mathematical analysis; Measuring devices; Phytoplankton; Zooplankton.

Ano: 1985

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3212

Tackx, M..

When considering zooplankton feeding as one of the pathways involved in the transfer of substances in marine ecosystems, it is important to study the composition and size distribution of the seston: firstly, the elements in which one is interested may be associated with different types and sizes of particles; secondly, particle size and composition are important factors in relation t o the feeding process of the zooplankton itself. High speed cinematographic studies have recently revealed that copepods use two different mechanisms for feeding. Small particles (< 12 pm) are collected by continuous low amplitude movements of the second maxillae and combing of the appendages. Larger particles are detected and collected individually by means of a specific...

Plankton size distributions and trophic relations before and after the construction of the storm-surge barrier in the Oosterschelde estuary

Palavras-chave: Ecosystems; Seston; Zooplankton.

Ano: 1984

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3273

Tackx, M.L.M.; Herman, P.M.J.; Van Rijswijk, P.; Vink, M.; Bakker, C..

Phytoplankton and zooplankton biomass distributions were calculated on a carbon basis for the inland part of the Oosterschelde, in the period before (1983), during (1984, 1986) and after (1987, 1988) the construction of the storm-surge barrier. In all years studied, both phytoplankton and zooplankton distributions are very irregular, and little consistent patterns emerge. The data were used to test the model of Sheldon et al. (1977). The observed standing stock ratios of zooplankton to phytoplankton agree with the model predictions in 1983, and are slightly higher during the period 1984-1987. In 1988, the model predictions are very different from the observed values, because of important changes in the zooplankton species abundance occurring in this year.

Selection of bacteria enhancing the growth rate of axenically hatched rotifers (Brachionus plicatilis)

Palavras-chave: Particles; Particles; Particles; Plankton; Size distribution; Spectra; Zooplankton; Netherlands.

Ano: 1994

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2675

Rombaut, G.; Dhert, P.; Vandenberghe, J.; Verschuere, L.; Sorgeloos, P.; Verstraete, W..

The effect of bacterial strains on the growth rate of rotifers, Brachionus plicatilis, was determined under monoxenic conditions. The first objective was to obtain sterile rotifer cultures starting from rotifer resting eggs using merthiolate or glutaraldehyde as disinfectant. Sterile rotifer cultures were obtained, without affecting the hatching ability of the resting eggs, when 0.05 µl/l glutaraldehyde was used. This disinfection procedure was used to examine the effect of 20 bacterial strains, isolated from well-performing live-feed production systems, on the population growth rate of rotifers cultured under monoxenic conditions. Five out of the 20 bacterial strains tested were able to improve significantly the asexual reproduction of rotifers. The...

The use of biomarkers in Daphnia magna testing: 3. Rapid toxicity testing of pure chemicals and sediment pore waters using ingestion and digestive enzyme activity

Palavras-chave: Aquaculture; Aquaculture techniques; Bacterial diseases; Disease transmission; Disinfection; Hatching; Zooplankton; Zooplankton culture; Brachionus plicatilis; Rotifera.

Ano: 1999

URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=4030

De Coen, W.M.; Vangheluwe, M.L.; Janssen, C.R..

In this study, 4 rapid (90 min) toxicity tests were developed using ingestion and digestive enzyme activity of Daphnia magna juveniles. Ingestion activity was assessed using fluorescent labelled latex micro-beads and digestive enzyme activity (trypsin, beta-galactosidase and esterase) was measured in homogenates using chromogenic (N-benzoyl-L-arginine-4-nitroanilide) and fluorogenic (4-methylumbelliferyl-B-D-galactoside and fluorescein diacetate) substrates.All assays and toxicity endpoints were evaluated for their potential use as routine toxicity testing tools for pure chemicals and sediment pore waters. The observed high correlation coefficients (r(2)>0.9) between the short-term toxicity values and the acute toxicity endpoint (24h...