Consulta: subjectFacets:"Seasonal variations"
Registros recuperados: 87
Data/hora: 09/06/2024 12:34:27

Таксономический   состав   и   сезонная   динамика   мягкораковинных фораминифер в Севастопольской бухте (Чёрное море)
Provedor de dados: 13
Autores: Аникеева, О. В.
Рассмотрены состав и особенности распределения мягкораковинных фораминифер на исследуемых станциях в Севастопольской бухте в течение года. Вычислена их доля в общем количестве мейобентоса. Впервые получены данные по сезонной динамике черноморских мягкораковинных фораминифер.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Seasonal variations; Meiobenthos; Http://aims.fao.org/aos/agrovoc/c_12481.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/601

Характеристика размерной структуры фитопланктона по измерениям хлорофилла «а»
Provedor de dados: 13
Autores: Осадчая, Т. С.
Представлена характеристика сезонных вариаций структуры  фитопланктона по трём размерным категориям (микро-, нано- и пикофитопланктона) в различных участках Севастопольской бухты.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Seasonal variations; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/592

Composition and diversity of benthic macroinvertebrates in a Brazilian Cerrado stream
Provedor de dados: 76
Autores: Pio,Jéssica F. G.; Santiago,Eunice de F. E.; Copatti,Carlos E.
ABSTRACT This study aimed to analyse the diversity and composition of benthic macroinvertebrate assemblages in the dry and rainy seasons in a Brazilian Cerrado stream, where it was hypothesized that the dry season has higher diversity and it differs in terms of organism composition in relation to the rainy season. Sampling was carried out in the dry (May and August/2016 and August/2017) and rainy seasons (November/2016 and February and November/2017). Individuals were identified at the family level and classified according to functional feeding group (FFG). There were 3,776 individuals, in which Chironomidae was the most abundant taxon with 2,226 organisms. The FFG with the highest number of individuals and species richness were collector-gatherer and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Chironomidae; Functional feeding group; Seasonal variations; Richness.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100216

Influence des apports fluviatiles en Baie de Seine
Provedor de dados: 5
Autores: Avoine, J; Crevel, L.
Hydrological study of Seine Bay displays two areas differentiated by salinity distribution. One has marine characteristics and the other is under fluvial influence. In this paper the authors give the main results of exchanges between the environments, obtained by the study of water dilution, solid particles dispersion, and their contribution to sedimentation.
Tipo: Text
Palavras-chave: Estuarine front; River plumes; Trace metals; Salinity; Residual flow; Seasonal variations; Environmental effects; Sediment dynamics; Estuarine sedimentation; River discharge.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1275.pdf

Etude des variations saisonnières de différents biomarqueurs, chez la moule Mytilus galloprovincialis. Relation avec certains paramètres physiques, chimiques et physiologiques
Provedor de dados: 5
Autores: Bodin, Nathalie.
The aim of this study was to evaluate the seasonal variations of six biomarkers on Mytilus galloprovincialis, using comparison with physiological index and chemical contamination levels on two sites of  Mediterranean sea. The seasonal variations of acetylcholinesterase (AChE), DNA adducts, benzo(a)pyrene hydroxylase (BPH), heat-shock proteins (HSP), metallothioneins (MT) and multixeniobiotic proteins (MXR) were estimated over a two-year period, on mussels which were sampled in Carteau (original site) and La Fourcade (transplanted organisms). Carteau, an industrial site, presents higher contamination levels (HAP, PCB, heavy metals) than La Fourcade, an urban area. The PAH profiles underline a strong spatio-temporal variability of levels and sources of...
Tipo: Text
Palavras-chave: Biomonitoring; Mytilus galloprovincialis; Biomarqueurs; Variations saisonnières; Biomonitoring; Mytilus galloprovincialis; Biomarkers; Seasonal variations.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00443/55499/57042.pdf

Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity
Provedor de dados: 5
Autores: Raybaud, V.; Nival, P.; Mousseau, L.; Gubanova, A.; Altukhov, D.; Khvorov, S.; Ibanez, F.; Andersen, V.
Short term changes in zooplankton community were investigated at a fixed station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise, September-October 2004). Mesozooplankton were sampled with vertical WPII hauls (200 mu m mesh-size) and large mesozooplankton, macrozooplankton and micronekton with a BIONESS multinet sampler (500 mu m mesh-size). Temporal variations of total biomass, species composition and abundance of major taxa were studied. Intrusions of low salinity water masses were observed two times during the cruise. The first one, which was the most intense, was associated with changes in zooplankton community composition. Among copepods, the abundance of Calocalanus, Euchaeta, Heterorhabdus, Mesocalanus, Nannocalanus, Neocalanus,...
Tipo: Text
Palavras-chave: Ligurian sea; Wind events; Phytoplankton community; Vertical distributions; Seasonal variations; English channel; Spring bloom; Oregon coast; Variability; Copepods.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00208/31975/30410.pdf

Microflores sulfatoreductrices en milieu subantarctique. Relations avec quelques parametres physicochimiques et biologiques. (Microflores totales et heterotrophes)
Provedor de dados: 5
Autores: Delille, D; Bouvy, M.
The archipelago of Kerguelen with its complex fjord distribution is particularly interesting for the study of anoxic systems. Between 1968 and 1972, several stations were investigated fortnightly. One of these was further sampled weekly throughout 1982. Each sample series of sediment included the superficial aerobic and subsuperficial anaerobic levels. Each level was examined for direct epifluorescent counts, heterotrophic and sulfate-reducing bacterial numbers by M.P.N. methods, organic carbon and sulfide measurements. Sulfate-reducing bacteria seemed less related to total biomass than the heterotrophic microflora, the latter being dependent on organic supplies. The hydrogen sulfide production was directly related to the presence of sulfate reducers;...
Tipo: Text
Palavras-chave: Anoxic conditions; Bacteria; Heterotrophic organisms; Sulphur; Organic carbon; Physicochemical properties; Seasonal variations; Population number; Microorganisms; Polar waters; Sulfate reduction.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-970.pdf

Variations saisonnières de l'absorption de l'azote dans un système brassé peu profond (Manche occidentale)
Provedor de dados: 5
Autores: Maguer, Jf; Lecorre, P; Madec, C.
Seasonal changes in inorganic (NH4+; NO3-; NO2-) and organic (urea) nitrogen uptake were studied with N-15 as a tracer at a shallow station (depth: 22 m) in permanently well-mixed waters of the Western English Channel. Uptake of all the four nutrients was maximum in spring. Nitrate uptake accounted for a third of the total during spring phytoplankton growth, but decrease in summer. This decrease was related to the low ambient nitrate concentrations in early summer and to an inhibition of uptake by high concentrations in late summer. Ammonium was taken up in significant amounts from the beginning of spring (46 % of total uptake), increasing to 59 % in summer. In contrast with nitrate, ammonium concentrations during summer were sufficiently high to saturate...
Tipo: Text
Palavras-chave: Nitrogen; Uptake; Seasonal variations; Western English Channel.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20723/18360.pdf

Caracteristiques saisonnieres de l'hydrobiologie du complexe estuariende Marennes-Oleron (France).
Provedor de dados: 5
Autores: Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J.
Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
Tipo: Text
Palavras-chave: Seasonal variations; Salinity; ATP; Estuaries; Turbidity; Hydrobiology; Salinity; Phytoplankton; Estuaries; Biomass; Hydrobiology; Physicochemical properties; Phytoplankton; Environmental conditions; Biomass.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/publication-1854.pdf

Seasonal variations in photosynthetic irradiance response curves of macrophytes from a Mediterranean coastal lagoon
Provedor de dados: 5
Autores: Plus, Martin; Auby, Isabelle; Verlaque, Marc; Levavasseur, Guy.
The main photosynthesis and respiration parameters (dark respiration rate, light saturated production rate, saturation irradiance, photosynthetic efficiency) were measured on a total of 23 macrophytes of the Than lagoon (2 Phanerogams, 5 Chlorophyceae, 10 Rhodophyceae and 6 Phaeophyceae). Those measurements were performed in vitro under controlled conditions, close to the natural ones, and at several seasons. Concomitantly, measurements of pigment concentrations, carbon, phosphorous and nitrogen contents in tissues were performed. Seasonal intra-specific variability of photosynthetic parameters was found very high, enlightening an important acclimatation capacity. The highest photosynthetic capacities were found for Chlorophyceae (e.g. Monostroma obscurum...
Tipo: Text
Palavras-chave: Thau lagoon; Phaeophyceae; Rhodophyceae; Chlorophyceae; Seagrasses; Seasonal variations; Oxygen method; Macrophytes; Light response curve; Photosynthesis.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-465.pdf

Reproduction naturelle de Crassostrea gigas Thunberg dans le bassin de Marennes-Oleron en 1979 et 1981: Aspects biochimiques et energetiques.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Berthome, Jean-paul; Razet, Daniel; Garnier, Jacqueline.
In summer 1979, the natural reproduction of oysters Crassostrea gigas Thunberg, in Marennes-Oleron basin, produced a large number of juveniles which was not the case in summer 1981. If one compares the evolution of the main constituents of the flesh, one can see that, at the beginning of August, before spawning the male oysters in 1981 contained 6,3% less proteins, 34,2% less lipids and 61,2% less glucids than those in 1979 and respectively 12,3%, 21,3% and 69,8% less as far as females are concerned. The energetic value of ash-free dry flesh of female oysters is nearly the same for the two years whereas for male oysters the value is slightly lower in 1981 than in 1979. The total energetic values of male and female oysters show a slight difference between...
Tipo: Text
Palavras-chave: Crassostrea gigas; Seasonal variations; Food availability; Water temperature; Saccharides; Proteins; Lipids; Biochemical composition; Gametogenesis; Spawning; Sexual reproduction.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1891.pdf

Nutrition phosphoree chez Chondrus crispus (Rhodophycees)
Provedor de dados: 5
Autores: Chopin, T; Floc'H, J; Bodeau, B; Penot, M.
Phosphorated nutrition of the red alga Chondrus crispus Stackh. is studied is two morphologically very dissimilar forms of the thallus. Phosphorus measurements, which were monthly carried out at different parts of the alga, showed first that the distribution of this element is not homogeneous along the thallus, and second that seasonal variations occur. It is suggested that the classical polymorphism of the species can be taken into account as concerns its physiology. Besides, from absorption and exsorption experiments which were performed with super(32)P as a tracer, it is shown that the high concentration factor of phosphorus in the alga as compared to the environmental seawater (up to 17.9 x 10 super(4)) can be explained as an effect of metabolic process.
Tipo: Text
Palavras-chave: Chondrus crispus; Algae; Distribution; Metabolism; Seasonal variations; Food absorption; Phosphorus; Plant nutrition.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1175.pdf

Nutrition chez des copepodes en milieu lagunaire mediterraneen en fonction de la concentration en particules et de la temperature
Provedor de dados: 5
Autores: Gaudy, R; Pagano, M.
The zooplankton of an eutrophic brackish lagoon (Etang de Berre), near Marseille (France) was studied during an annual cycle. It was characterized by large populations of a pelagic copepod (Acartia tonsa ). Grazing on natural particles by this species was investigated. Adults were able to use an extended range of particle sizes, but showed selectivity for particles concentration was observed (14 mu m). Temperature and particles concentration appear to modify the selectivity behavior. Juvenile stages could also catch particles of various size but did not show the same selectivity for the peak particles as adults. Daily food ration was high comparatively to open-sea copepods. Taking into account several results obtained on food ration, egg production and...
Tipo: Text
Palavras-chave: Copepoda; Lagoons; Energy budget; Seasonal variations; Particle concentration; Zooplankton; Food availability; Temperature effects; Nutrition.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1526.pdf

Trophic relationships between benthic or planktonic microphytes and infaunal bivalve molluscs
Provedor de dados: 5
Autores: Plantecuny, M; Bodoy, Alain.
In order to estimate energetic relationship, microphytic and benthic bivalve levels of a shallow (1.5 m), sandy ecosystem near Marseille (Gulf of Fos, Southern France) were sampled monthly during 1.5 year, in two sites differing by their wave exposure. In the sheltered area, the bivalve Ruditapes decussatus was the dominant species, while another bivalve, Donax trunculus , was found in the open, wave exposed site. Chlorophyll a and primary production of the phytoplankton and the microphytobenthos, as well as population dynamic, growth and biochemical composition of bivalves (lipids, proteins and carbohydrates) were monitored.
Tipo: Text
Palavras-chave: Ruditapes decussatus; Bivalvia; Periphyton; Phytoplankton; Biochemical composition; Growth; Marine molluscs; Hydrodynamics; Seasonal variations; Primary production; Trophic relationships.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1528.pdf

Fish fauna of a mixed meadow composed by the seagrasses Cymodocea nodosa and Zostera noltii in the Western Mediterranean
Provedor de dados: 5
Autores: Guidetti, Paolo; Bussotti, Simona.
The fish fauna of a shallow meadow composed by the seagrasses Cymodocea nodosa and Zostera noltii was studied in the Gulf of Olbia (NE Sardinia, Italy; Western Mediterranean). Visual censuses were conducted monthly from August 1995 to August 1996. Environmental variables for water temperature, salinity and seagrass shoot density were collected on each sampling occasion. A total of 23 fish species from eight families were recorded. Planktivorous species (Atherinids) numerically dominated the fish community, followed by necto-benthic fish, chiefly Labrids and Sparids. There was no discernible trend in total fish density. Species richness, diversity, evenness and density of necto-benthic species, instead, displayed a distinct seasonal pattern, higher Values...
Tipo: Text
Palavras-chave: Ichtyofaune; Phanérogames marines; Variations seasonnières; Mediterranée; Fish fauna; Seagrasses; Seasonal variations; Mediterranean.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43373/42838.pdf

Relations between bacterial extracellular enzyme activities and heterotrophic substrate uptake in a brackishwater environment.
Provedor de dados: 5
Autores: Hoppe, H.
Extracellular enzymes mediate the decomposition of polymeric organic compounds in natural waters. In many cases these enzymes comprise a component linked to the bacterial fraction of the aquatic community and react in close association with these cells. An annual survey of microbial activities in a brackish water fjord exhibited an excellent correlation between V sub(m) of proteases (ability to split the substrate analogue methylumbelliferyl-leucine) and V sub(m) as well as T sub(R) for leucine uptake by microorganisms. Hydrolysis rates (H sub(R)) for the decomposition of naturally occurring competitive substrate analogues of the model substrates (methylumbelliferyl-(MUF)-leucine, MUF- alpha -D-glucose, MUF-N-acetyl-glucosamine, MUF-phosphate) drastically...
Tipo: Text
Palavras-chave: Biogeochemistry; Fjords; Bacteria; Brackishwater environment; Seasonal variations; Dissolved organic matter; Interspecific relationships; Hydrolysis; Enzymes.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-952.pdf

Influence of oyster culture practices and environmental conditions on the ecological status of intertidal mudflats in the Pertuis Charentais (SW France): A multi-index approach
Provedor de dados: 5
Autores: Bouchet, Vincent; Sauriau, Pierre-guy.
The ecological quality status (EcoQ) of intertidal mudflats constrained by Pacific oyster farming was assessed by single (H', AMBI, BENTIX and BOPA) and multimetric (M-AMBI and average score) index approaches in the Pertuis Charentais (SW France). Fifteen sampling stations were monitored seasonally for sedimentological features and macrozoobenthos in 2004. Sediments affected by oyster biodeposits showed organic matter enrichment, and sediments from off-bottom culture sites had higher organic matter contents and lower redox potentials than sediments from on-bottom culture sites. Biotic indices consistently registered responses of macrozoobenthos to organic enrichment but there was only partial agreement between single index-derived EcoQs. The average score...
Tipo: Text
Palavras-chave: Exposed/sheltered; Seasonal variations; Benthic macrofauna; Biotic index; Intertidal mudflats; Oyster farming practices.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4650.pdf

Effect of environmental and nutritive conditionings on defense mechanisms of oyster Crassostrea gigas during an annual cycle
Provedor de dados: 5
Autores: Delaporte, Maryse; Moal, Jeanne; Soudant, Philippe; Lambert, Christophe; Pouvreau, Stephane; Enriquez, Martha; Degremont, Lionel; Soletchnik, Patrick; Gagnaire, Beatrice; Ropert, Michel.
In the frame of MOREST project, a common biological material, resulting of a mixture of different families produced in experimental hatchery, was reared in two different environmental fields : Normandy and Charente. Concomitantly, a pool was conditioned at the Ifremer Argenton hatchery with three different algae levels : 4%, 8% and 12% of algal dry weight per oyster dry weight. During the experiments, five immune parameters were studied in parallel with survival rate and reproductive status (stages and intensity). Site location, seasonal variations and experimental diet level clearly influenced oyster immune parameters. Haemocyte counts were higher for oysters reared in Normandy than those reared in Charente and in hatchery. Granulocyte percentage was...
Tipo: Text
Palavras-chave: Defense mechanisms; Nutrition; Seasonal variations; Physiology; Crassostrea gigas; Pacific oysters.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3500.pdf

Role des bacteries phototrophes anoxygeniques dans une partie stratifiee d'une lagune tropicale (Lagune Ebrie, Cote d'Ivoire)
Provedor de dados: 5
Autores: Caumette, P.
In the deepest parts of the estuarine region of Ebrie Lagoon (Abidjan Africa, (5 degree N, 4 degree W) stratified conditions have been observed during the rainy season (May to Nov.), owing to salinity differences between oxic and anoxic layers. At the interface, 3-4 m depth, phototrophic bacteria (Chromatium, Chlorobium and Pelodictyon ) developed, forming a brown layer due to their different pigments. Their production has been estimated at 41% of the total photosynthetic production during high stratification (Sep. 1981) and their biomass was used by the copepod population for 40 to 60% of its diet. During the dry season, the water column became homogeneous and oxygen was detected to 6m depth. The brown layer of phototrophic bacteria disappeared, as well...
Tipo: Text
Palavras-chave: Chlorobium; Chromatium; Primary production; Photosynthesis; Estuaries; Seasonal variations; Plankton; Stratification; Vertical distribution; Bacteria; Coastal lagoons; Trophic relationships; Biomass.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-957.pdf

Reproduction et recrutement de la coque Cerastoderma edule L. a Saint-Pol-de-Leon (Bretagne Nord)
Provedor de dados: 5
Autores: Guillou, Jean-louis; Tartu, C.
Investigation on the recruitment of Cerastoderma edule was carried out at St-Pol-de-Leon over three years. This approach is intended to disclose in the fluctuations of recruitment the part of variability linked with reproduction and spawning. Stages of sexual maturity are used together with a condition index. The reproductive activity spread out over the most part of the year, ripe individuals being observed even in winter. Main spawning took place in summer and autumn. Seasonal and interannual fluctuations of recruitment are associated with the variations of the condition index. An increase of the reproductive activity could be observed between 1987 and 1989 related with temperature. It is shown that this factor is the main responsible of the variations...
Tipo: Text
Palavras-chave: Cerastoderma edule; Bivalvia; Marine molluscs; Temperature effects; Recruitment; Seasonal variations; Sexual maturity; Reproductive cycle; Spawning; Sexual reproduction.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1719.pdf

Bilan energetique d'une population naturelle de Crepidula fornicata dans le bassin de Marennes-Oleron
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Heral, Maurice; Masse, H.
An energy budget has been evaluated for a natural population of Crepidula fornicata living at low water of spring tides in the oyster farming basin of Marennes-Oleron. This budget of production was estimated according to the position along the chain. The average biomass for an individual representative of the population was equivalent to 1.87 Kjoules, and the annual consumption C was 20.08 Kjoules/year. The energy budget expressed in percent of energy consummates was: C = Pg + Pr + Ps + R + F; 100 = 4.6 + 1.6 + 0.8 + 48 + 45. This budget is compared with literature data on other herbivorous gastropods and with those calculated for Crassostrea gigas in the same locality.
Tipo: Text
Palavras-chave: Bivalvia; Crepidula fornicata; Seasonal variations; Population structure; Energy budget; Bassin de Marennes Oléron; Bilan énergétique; Crepidula fornicata.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1181.pdf

Seasonal changes in mRNA encoding for cell stress markers in the oyster Crassostrea gigas exposed to radioactive discharges in their natural environment
Provedor de dados: 5
Autores: Farcy, Emilie; Voiseux, Claire; Lebel, Jean-marc; Fievet, Bruno.
The North Cotentin area (Normandy, France) hosts several nuclear facilities among which the AREVA reprocessing plant of La Hague is responsible for controlled discharges of liquid radioactive wastes into the marine environment. The resulting increase in radioactivity is very small compared to natural radioactivity. However, concerns about environment protection prompted the scientific community to focus on the effects of the chronic exposure to low concentrations of radionuclides in non-human biota. This study contributes to the evaluation of the possible impact of radioactive discharges on the oyster Crassostrea gigas in the field. Real-time polymerase chain reaction was used to quantify the expression levels of genes involved in cell stress in the...
Tipo: Text
Palavras-chave: Crassostrea gigas; Superoxide dismutase; Metallothionein; Heat shock protein; MRNA; Seasonal variations; Radioactive discharges.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2601.pdf

Factors affecting bacterial biomass and growth in the Duplin River estuary and coastal Atlantic Ocean.
Provedor de dados: 5
Autores: Fallon, R; Newell, S; Sherr, B; Sheer, E.
Bacterial numbers and growth rates were measured in coastal, planktonic systems of the Western Atlantic ocean. Seasonal responses in growth rates of the bacterial assemblage were present at some sites, but these may be related to seasonal changes in substrate supply rather than to changes in temperature. Bacterial growth rates tended to decline with increasing distance from shore. There was evidence for predator-prey population cycles in the bacteria and &lt; 17 mu m protozoa in the Duplin River Estuary which may indicate that the bacterial assemblage serves as prey for protozoan populations. In summer, a significant negative correlation between mu (instantaneous growth rate) and cell numbers in the bacterial assemblage indicated that substrate limitation...
Tipo: Text
Palavras-chave: Protozoa; Plankton; Bacteria; Predators; Grazing; Temperature effects; Seasonal variations; Limiting factors; Interspecific relationships; Nutrients (mineral); Growth.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-955.pdf

Regime alimentaire des especes du genre Lepidotrigla Gunther 1860 (Pisces, Osteichthyes) de la Mer Catalane
Provedor de dados: 5
Autores: Kartas, F.
This study concerns stomach contents of 230 L. cavillone and 10 Lepidotrigla sp coming from trawling done for l yr off Banyuls-sur-Mer (France) at a depth ranging from 80 to 150 m. The food variation in quantity and in quality are given by season.
Tipo: Text
Palavras-chave: Catalan sea; Seasonal variations; Foodstuff; Stomachal content; Lepidotrigla.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-2161.pdf

Nitrate respiration and nitrification in estuarine sediments.
Provedor de dados: 5
Autores: Herbert, R.
Seasonal data and depth profiles using super(15)N-labelled NO sub(3)u- show that denitrification (77-90% of NO sub(3)u- respired) rather than NO sub(3)u- dissimilation to NH sub(4)u+ was the principal route of nitrate reduction in Kingoodie Bay sediments. Populations of both groups of NO sub(3)u- reducing bacteria were highest in the 0-20 mm horizon in those sediments where highest rates of NO sub(3)u- respiration were recorded (28.56 mu g N.d super(-1) dry wt. sediment super(-1)). Autotrophic nitrification rates shared a marked seasonality with highest rates (0.92 mu g N.d super(-1).g dry wt. sediment super(-1)) occurring during the summer. Maximum populations of autotrophic nitrifying bacteria were also found in the 0-20 mm sediment horizon and these...
Tipo: Text
Palavras-chave: Seasonal variations; Bacteria; Estuaries; Sediment chemistry; Biogeochemistry; Ammonia; Nitrates; Nitrogen cycle.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-971.pdf

Evolution saisonnière des populations de diatomées benthiques dans les lagunes aménagées de Certes
Provedor de dados: 5
Autores: Malissen, M.o.; Lasserre, P.
In lagoons and estuarine ecosystems, the benthic microflora contributes considerably to the primary production of the area and consists largely of diatoms Monthly samplings have been made from December 1976 to March 1978 in a shallow station characterized by the lack of macrophytes. Two sets of monthly sam­plings were made allowing in theone hand a qualitative analysis and on the other hand a quantitative study by cellular counts. The diatom populations show a cyclic evolution with two peaks : one in February 1977 and the other in September 1977. This cycle is confirmed by the di­versity and dominance analysis. Seasonal evolution is characterized by the domi­nance of one or more species with well marked succession of dominant species (Nitzschia Navicula et...
Tipo: Text
Palavras-chave: Diatomées benthiques; Variations saisonnières; Diversité; Lagunes; Bassin d'Arcachon; Benthic diatoms; Seasonal variations; Diversity; Lagoons; Arcachon Bay.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41679/40888.pdf

Evaluation des ressources halieutiques de l'ouest de l'Europe (EVHOE) par campagnes de chalutages programmes : Deuxième phase : Distribution saisonnière et évaluation des ressources halieutiques du golfe de gascogne.
Provedor de dados: 5
Autores: Ifremer, -.
Tipo: Text
Palavras-chave: Campagne de chalutage; Biomasse; EVOHE; Indices d'abondance; Halieutics; Seasonal variations; Biscay bay; Trawl survey.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/rapport-2189.pdf

Variability in diel and seasonal in situ metabolism of the tropical gastropod Tectus niloticus
Provedor de dados: 5
Autores: Lorrain, A.; Clavier, J.; Thebault, J.; Tremblay-boyer, L.; Houlbreque, F.; Amice, E.; Le Goff, M.; Chauvaud, L.
Researchers often use metabolic measurements in the field over narrow time periods to estimate an organism's metabolism over large time scales. Here, we measured in situ respiration, calcification and excretion rates of the tropical gastropod Tectus niloticus L. through benthic chamber experiments. Our samples spanned a 21 h time frame and were taken during both the warm and cool seasons. We assessed diel and seasonal variability in metabolic rates, as well as the effect of individual size and the contribution of shell epi-and endobionts. Our results show that metabolic rates vary through time at both diel and seasonal scales, as measured fluxes for respiration and calcification were significantly higher at night during the warm season. This nocturnal...
Tipo: Text
Palavras-chave: Gastropod; Seasonal variations; Diel variations; Size; Carbon fluxes; CO2; CaCO3; New Caledonia.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00256/36675/39633.pdf

Les elements nutritifs en baie de Seine
Provedor de dados: 5
Autores: Aminot, Alain; Kerouel, Roger; Mauvais, J.
Seasonal variations of dissolved nutrient concentrations are reported in this paper. Impacts of freshwater are investigated by the study of dilution, nutrient quantity, and relation with phytoplanktonic growth.
Tipo: Text
Palavras-chave: Silicon; Phosphorus; Nitrogen; Seasonal variations; Dilution; Primary production; Eutrophic waters; Phytoplankton; River discharge; Coastal zone; Nutrients (mineral).
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1295.pdf

Approche de l'état physiologique de l'huître creuse Crassostrea gigas au cours d'un cycle saisonnier à Marennes-Oléron
Provedor de dados: 5
Autores: Moal, Jeanne; Samain, Jean-francois; Bodoy, Alain; Le Coz, Jean-rene.
The energy charge was measured for two Crassostrea gigas populations, during an annual survey at Marennes Oleron, to appreciate the condition of health of these oysters. It is assumed that the actual decrease in production of this area is related to a biomass overload which affects the oysters by lowering their scope for growth. Energy charge, an index developped by ATKINSON (1968), defines the energy equilibrium of organisms. It is the adenylic nucleotide ratio: E.C = (ATP + 1/2ADP)/ATP + ADP + AMP). We have measured this parameter to determine the state of health of these oysters. A methodological study has been conducted previously to define the conditions of sampling, conservation and extraction for a HPLC assay. The HPLC method (high performance...
Tipo: Text
Palavras-chave: Marennes Oleron; Seasonal variations; Crassostrea gigas; Physiological indice; Nucleotides; Energy charge; Marennes Oléron; Cycle saisonnier; Crassostrea gigas; Indiced physiologique; Nucléotides; Charge énergétique.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2869.pdf

Evaluation des apports fluviatiles dans l''estuaire de la Seine
Provedor de dados: 5
Autores: Avoine, J.
Economic activities and urbanization along the Seine watershed, are the main factors of increased river discharge with natural deposits. A long term supervision of this river has allowed the assessment of the liquid flow rate, the solid load, and the metallic pollution.
Tipo: Text
Palavras-chave: Seasonal variations; Trace metals; Sediment transport; Fluid flow; Brackishwater pollution; Estuarine sedimentation; River discharge.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1274.pdf

Influence of temperature, salinity and E. coli tissue content on immune gene expression in mussel: Results from a 2005-2008 survey
Provedor de dados: 5
Autores: Li, Hui; Toubiana, Mylene; Monfort, Patrick; Roch, Philippe.
Several bivalves, including mussels, suffered from mortalities particularly in summer. To look for the possible effect of environmental parameters on immune capacities, Mytilus galloprovincialis were collected monthly from August 2005 to July 2008 from the Palavas Laguna, French Mediterranean coast. Q-PCR was used to quantify the expression of three antimicrobial peptide genes (defensin, mytilin B and myticin B), in addition to lysozyme and HSP70. House keeping gene was 28S rRNA. Defensin, myticin B and lysozyme appeared more expressed in spring-summer than in winter. In contrast, HSP70 expression was higher in winter. Statistical studies using principal component analysis (PCA) and multiple regression models revealed positive influence of temperature on...
Tipo: Text
Palavras-chave: Mollusks; Mytilus; Innate immunity; Seasonal variations; Immune survey; Q PCR; HSP70; Lysozyme; Myticin; Mytilin; Defensin; Antimicrobial peptide.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7345.pdf

The reproductive cycle of the European clam Ruditapes decussatus (L., 1758) in two Portuguese populations: Implications for management and aquaculture programs
Provedor de dados: 5
Autores: Matias, Domitilia; Joaquim, Sandra; Matias, Ana Margarete; Moura, Paula; Sousa, Joana; Sobral, Paula; Leitao, Alexandra.
The reproductive cycle, as well as its nutrient storage and utilization, of two populations of Ruditapes decussatus from the main production areas of this species: Ria de Aveiro and Ria Formosa Lagoon (Portugal) were studied here over a 24 month period (May 2010-April 2012). The reproductive cycle of both populations of R. decussatus followed an annual cyclicality that comprised a ripe stage in spring followed by a spawning period that began in late spring and extended throughout summer until early autumn. This extended and continuous spawning period may be an advantageous strategy for this species by ensuring a continuous supply of gametes. Moreover, R. decussatus can adopt different reproductive strategies depending on the geographical origin. The...
Tipo: Text
Palavras-chave: European clam; Ruditapes decussatus; Reproductive cycle; Portuguese populations; Biochemical composition; Seasonal variations.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00152/26292/25461.pdf

Seasonal variation of microbial population from sediments of Vellar Estuary, South India.
Provedor de dados: 5
Autores: Lakshmanaperumalsamy, P; Chandramohan, D; Natarajan, R.
A seasonal study on the occurrence and distribution of total aerobic microbial population (TMP), total aerobic heterotrophic bacteria (THB), actinomycetes and fungi in the sediments of Vellar Estuary, South India (11 degree 29'N 79 degree 46'E) was carried out during Jan. to Dec. 1975. Sediment samples were collected at monthly intervals, from 4 stations and analysed microbiologically. In general, bacterial population was found to be dominant followed by actinomycetes and fungi. The max peak for TMP, THB and fungi were recorded in Nov. in all stations. Monsoon season supported TMP, THB and fungi to a high level and it was summer for actinomycetes. Statistical analysis (Kendall's tau) showed a significantly positive correlation among TMP, THB, actinomycetes...
Tipo: Text
Palavras-chave: Actinomycetes; Population number; Statistical analysis; Seasonal variations; Fungi; Bacteria; Sediment analysis; Microbiological analysis.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-943.pdf

Premieres donnees sur la dynamique du peuplement macrobenthique des sables fins envases a Abra alba de la Baie de Seine orientale
Provedor de dados: 5
Autores: Gentil, F; Irlinger, J; Elkaim, B; Proniewski, F.
The dynamics of macrobenthos populations living in muddy fine sands near Seine estuary have been studied, to obtain quantitative data for the knowledge of these populations and the impact of macrotidal environment disturbances.
Tipo: Text
Palavras-chave: Seasonal variations; Population density; Population number; Ecosystem disturbance; Environmental effects; Population dynamics; Zoobenthos.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1309.pdf

Frecuencia estacional del microplancton costero de Montevideo durante en el año 1958
Provedor de dados: 20
Autores: Ferrando, H.J.
Se busca obtener una visión, lo más completa posible, de las variaciones del microplancton costero de Montevideo, tomando como base un punto de toma fijo (Playa de los Ingleses), durante el transcurso de un año completo, a los efectos de establecer un punto de partida para estudios regulares en los años venideros, de tal modo que permita llegar al conocimiento de las variaciones estacionales de este importante grupo hidrobiológico.
Tipo: Journal Contribution
Palavras-chave: Plankton; Seasonal variations; Planktonology; Plankton; Http://aims.fao.org/aos/agrovoc/c_5950.
Ano: 1959
URL: http://hdl.handle.net/1834/3028

Evaluation des stocks et aménagement des pêcheries de la ZEE mauritanienne
Provedor de dados: 20
Autores: Diop, M.; Inejih, C.A.O.; Tous, P.; Failler, P.; Dia, M.A.
Le cinquième groupe de travail destiné à l’évaluation des stocks et l’aménagement des pêcheries de la zone économique exclusive mauritanienne s’est réuni à l’Institut Mauritanien de Recherches Océanographiques et des Pêches (IMROP) du 9 au 17 décembre 2002. Les objectifs de ce groupe de travail étaient d’actualiser les résultats des groupes de travail précédents, en utilisant les nouvelles informations disponibles ; d’établir un diagnostic des différents stocks et pêcheries afin de définir les potentiels de capture ainsi que les caractéristiques de l’effort permissible et d’évaluer l’impact des mesures d’aménagement actuellement en vigueur et identifier les perspectives à venir. Les résultats obtenus ont contribué à la formulation de recommandations...
Tipo: Journal Contribution
Palavras-chave: Artisanal fishing; Catch composition; Catch statistics; Catch/effort; Cephalopod fisheries; Coastal fisheries; Demersal fisheries; Economic analysis; Environmental conditions; Fishery economics; Fishery management; Fishing effort; Fishing fleet; Landing statistics; Marine environment; Overfishing; Pelagic fisheries; Population dynamics; Prices; Quality assurance; Quality control; Research institutions; Research vessels; Seasonal distribution; Seasonal variations; Shrimp fisheries; Socioeconomic aspects; Upwelling; Demersal fisheries; Economic analysis; Fishery management; Marine environment; Prices; Research vessels; Catch composition; Coastal fisheries; Environmental conditions; Fishing effort; Overfishing; Pelagic fisheries; Population dynamics; Quality assurance; Research institutions; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_2469; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_6178; Http://aims.fao.org/aos/agrovoc/c_6516; Http://aims.fao.org/aos/agrovoc/c_1384; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_35287; Http://aims.fao.org/aos/agrovoc/c_6514.
Ano: 2005
URL: http://hdl.handle.net/1834/1322

Estudios ecológicos en el Golfo San Jorge y adyacencias (Atlántico sudoccidental). Distribución, abundancia y variación estacional del fitoplancton en relación a factores físico-químicos y la dinámica hidrológica.
Provedor de dados: 20
Autores: Akselman, R.
This study was based on four seasonal cruises during 1984 and 1985.  It revealed a thermo-haline frontal system formed by the advection of the Coastal Water mass flowing in two branches, one running towards the coast and the other mid-shelf directed. The thermocline developed between late spring and autumn results in a low inorganic nutrient concentration in the upper layer. Nonetheless in winter, a vertical homogeneity and high nutrient concentration were observed.  Phytoplankton development presented a typical temperate-seas annual cycle. In winter, reduced populations were dominated by diatoms. The highest biomass concentration in the cycle coincided with the spring blooming, to which Thalassio sira anguste-lineata,Alexandrium tamarense, Heterocapsa...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Abundance; Trophic relationships; Cysts; Seasonal variations; Seasonal thermocline; Plankton surveys; Environmental effects; Phytoplankton; Cysts; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34811.
Ano: 1996
URL: http://hdl.handle.net/1834/1464

Etude faunistique et écologique des annelides polychètes de la côte Nord-Est de la Tunisie (Peninsule du Cap Bon, Mediterranée Ouest)
Provedor de dados: 20
Autores: Zaabi-Sendi, Sana.
The polychaetes communities structure and functioning of the Cap Bon peninsula (Northeast coast of Tunisia), were analyzed from 52 stations from Sidi Daoud to Menzel Horr. The faunistic study reveals the presence of 238 polychaetes species among which 86 records are newly reported for the Tunisian coasts. The total number of polychaetes listed in Tunisia rises to 375 species.  The polychaete community structure at the sites was examined by multivariate methods. five main polychaetes communities were identified in the study area, the sandy sediment community (SS), the muddy sediments community (SV), the coarse sediment community (SG), the fine-muddy sediment community (SFV) and the Heterogeneous sediments community (HS). These communities are distributed...
Tipo: Theses and Dissertations
Palavras-chave: Seasonal variations; Genetic diversity; Polychaeta; Annelida.
Ano: 2013
URL: http://hdl.handle.net/1834/5480

Áreas potenciales de descarte de merluza para la actividad de la flota comercial argentina
Provedor de dados: 20
Autores: Dato, C.V.; Villarino, M.F.; Cañete, G.R.
To improve the quality of the resource assessment it is necessary to estimate discards and quantify them applying an adequate methodology. The purpose of this work is to detect areas where the activity of the commercial fleet coincides with zones of high concentration of juveniles because they are potential discard areas. To establish possible seasonal and/or interannual variations, length distribution data derived from hake research surveys carried out on board of INIDEP vessels during the 1986-1993 period were analyzed. Samples were grouped per statistical rectangle on the basis of catch weighted average and mean, variance, skewness and kurtosis were calculated. The resulting parameters were subjected to a cluster analysis using the Euclidean distance...
Tipo: Journal Contribution
Palavras-chave: Gadoid fisheries; Commercial fishing; Fishing grounds; Juveniles; Fishing effort; Seasonal variations; Fishing grounds; Juveniles; Fishing effort; Http://aims.fao.org/aos/agrovoc/c_2947; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_24027.
Ano: 2006
URL: http://hdl.handle.net/1834/1586

Variabilité saisonnière des flux biogéochimiques dans l'écosystème d'upwelling du Benguela sud
Provedor de dados: 20
Autores: Koné, Vamara; Koné, Yéfanlan José-Mathieu.
Les écosystèmes planctoniques marins sont soumis à des contraintes internes et externes qui influent sur leur dynamique. Celles-ci vont agir au niveau des processus éco physiologiques, biogéochimiques et comportementaux des organismes en présence. L'intégration de ces processus sous forme de système d'équations différentielles aboutit à des modèles permettant la stimulation de la dynamique et du comportement global de l'écosystème considéré. Les écosystèmes sont également contrôlés par les contraintes hydrodynamiques.Leur approche se fera grâce à des modèles couplés physique/biogéochimique. L'utilisation d'un modèle couplé qui prend en compte à la fois les processus dynamiques de la circulation océanique  et les bases de l'activité biologique, permet une...
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Upwelling.
Ano: 2010
URL: http://hdl.handle.net/1834/5772

Variación mensual y mareal del zooplancton en una estación fija del estero del Muerto, Golfo de Guayaquil
Provedor de dados: 20
Autores: Arcos, F.; Martínez, L.
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.
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Zooplankton; Biomass; Zooplankton; Biomass; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 1986
URL: http://hdl.handle.net/1834/2142

Ciclo anual y variabilidad de baja frecuencia de la temperatura superficial del Mar en el Océano Atlántico Sudoccidental
Provedor de dados: 20
Autores: Martínez Avellaneda, N.
Se estudia el ciclo estacional y la variabilidad de baja frecuencia en el Oceano Atlantico SO, analizando 15 anos (ene.1985-dic. 1999)de observaciones satelitales de temperatura superficial del mar (TSM). Los campos de la TSM tienen una resolucion temporal de 2 dias y espacial de 18km y fueron derivados de observaciones del sensor Advanced Very High Resolution Radiometer de la National Oceanic and Atmospheric Administration (NOAA, EEUU). Se realizo un ajuste con una regresion de cuadrados minimos para los armonicos anual y semianual. Los ajustes para todos los puntos de grilla del area de estudio contabilizaron entre el 70. Y el 95 de la variabilidad de la TSM, dependiendo de la region. La amplitud estimada del ciclo estacional varia entre 5 degree C y...
Tipo: Theses and Dissertations
Palavras-chave: Annual variations; Continental shelves; Seasonal variations; Surface temperature; Satellite sensing; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_32413.
Ano: 2005
URL: http://hdl.handle.net/1834/2828

Producción estacional de Oithona nana (Copepoda: Cyclopoida) en aguas costeras de Argentina
Provedor de dados: 20
Autores: Temperoni, B.
Oithona nana (Copepoda: Cyclopoida)is a widely-distributed neritic species, which often comprises up to 90 percentage of the zooplankton in many coastal areas. This small copepod plays an important role as a dominant prey in the diet of Engraulis anchoita larvae, which is a main component of major ecological relevance in the pelagic food webs of the Argentine Sea (SW Atlantic Ocean). The objective of this study was to estimate, for the first time, the seasonal variation of O. nana secondary production in a temperate region: coastal waters off Buenos Aires province, Argentina, at the EPEA Station (Estación Permanente de Estudios Ambientales, (38°28' S-57°41' W). Zooplankton samples (N=14)were taken by oblique tows of a Minibongo net (mouth diameter: 0.18 m;...
Tipo: Theses and Dissertations
Palavras-chave: Secondary production; Coastal waters; Zooplankton; Seasonal variations; Abundance; Environmental conditions; Zooplankton; Coastal waters; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 2008
URL: http://hdl.handle.net/1834/3131

Dinámica del ultrafitoplancton en el Mar Argentino
Provedor de dados: 20
Autores: Silva, R.I.
Ultraphytoplankton is composed by a group of organisms phylogenetically diverse, which contribute significantly to the total biomass and primary production in different oceanic and coastal pelagic systems. The success of ultraphytoplankton is attributed to its high efficiency in capturing light and nutrients, due to their small cell size and low sinking rate. The community structure is driven by the interaction among biotic and abiotic variables, such as temperature, nutrients, light and predators. The objective of this work was to assess the ecological importance of ultraphytoplankton organisms at the EPEA station, situated in the Buenos Aires coastal pelagic system (Argentina, SW Atlantic), during the period 2000-2009. In particular, ultraphytoplankton...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Seasonal variations; Environmental factors; Community composition; Biomass; EPEA; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4504

Distribución, abundancia y estacionalidad de Liriope tetraphylla (Hidromedusa, Trachymedusae) en el Océano Atlántico Sudoccidental y su rol ecológico en el estuario del Río de la Plata
Provedor de dados: 20
Autores: Gaitán, E.N.
In zones of high productivity and/or in shallow waters (frontal or upwellings areas, bays and estuaries) the hydromedusae can reach exceptional abundances, denominated 'blooms'. Occasionally, these exceptional abundances are originated from some few individuals that constitute a 'seed population', which is retained in particular places while the environmental conditions are adverse. Liriope tetraphylla is a holoplanktonic and oceanic hydromedusae that often is found forming dense aggregations, which are developed mainly in the Buenos Aires coast during the summer in Argentinian waters (SW Atlantic). The temporal-space distribution and the abundance of L. Tetraphylla in the Subantarctic region were analyzed, with 1458 samples embracing the Argentinian and...
Tipo: Theses and Dissertations
Palavras-chave: Ecological aggregations; Geographical distribution; Abundance; Seasonal variations; Life history.
Ano: 2004
URL: http://hdl.handle.net/1834/5029

Période de ponte, sex-ratio et maturité sexuelle du brochet de mer Sphyraena sphyraena (Teleostei, Sphyraenidae)  au nord et a l’est de la côte Tunisienne (mediterranée occidentale et centrale)
Provedor de dados: 20
Autores: Ezzeddine-Najaï, S.; Chemmam-Abdelkader, Bachra; Kraiem, M.M.
Neuf cent vingt et un (921) spécimens du Brochet de mer (Sphyraena sphyraena) dont 366 mâles et 519 femelles ont été récoltés au Nord et à l’Est de la côte tunisienne.  La période de frai se déroule d’avril à août avec un maximum au mois de mai. L’analyse des rapports gonado–somatique (RGS) et hépato-somatique (RHS) montre que les réserves vitellines sont stockées au niveau du foie, ce qui permet de classer cette espèce parmi les poissons maigres. L’étude de la sex-ratio exprimée par mois et par classe de taille, montre que les femelles sont significativement dominantes tout au long de l’année, sauf pour les mois de mai et juin au cours desquels les proportions s’inversent significativement en faveur des mâles de taille comprise entre 25 et 29cm. Le...
Tipo: Journal Contribution
Palavras-chave: Sphyraena sphyraena; Age at recruitment; Breeding; Length; Sexual maturity; Seasonal variations; Sex ratio; Sexual reproduction; Size; Spawning; Length; Spawning; Breeding; Sexual maturity; Sex ratio; Sexual reproduction; Size; Http://aims.fao.org/aos/agrovoc/c_4260; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_49902; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_26876; Http://aims.fao.org/aos/agrovoc/c_7093.
Ano: 2007
URL: http://hdl.handle.net/1834/4261

Variations saisonnières des facteurs hydrologiques et du biovolume microalgal benthique au sein d'un habitat artificiel (Acadja-enclos) dans la lagune Ebrié: site d'Adiapoté
Provedor de dados: 20
Autores: Konan-Brou, Amoin Annabelle.
Cet article présente les résultats d'une étude comparative des caractéristiques physico-chimiques (température, turbidité, salinité, pH, concentration en O2 dissous, en phosphates, nitrates, nitrites, ammoniaque)au sein d'une structure d'aquaculture extensive (acadja-enclos)ou habitat artificiel pour poissons et dans l'eau libre environnante. Les caractéristiques du périphyton se développant sur les bambous de l'acadja-enclos sont décrites. L'acadja-enclos est implanté dans le site d'Adiopoté en milieu lagunaire peu profond (1.5 à 2m) et sous influence marine. L'étude a été conduite de novembre 1988 à décembre 1989. La température (25 à 31°C), les concentrations en oxygène dissous (3.8 à 7.2mgl-1); la salinité (1 à 27%0) et le pH (6.7 à 8.6) ont les mêmes...
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Environmental factors.
Ano: 1993
URL: http://hdl.handle.net/1834/5729

Contribution à l'analyse d’intensité de l'upwelling près du Cap Blanc (Mauritanie) à partir des températures d'eau de la station « standard » Bayadère
Provedor de dados: 20
Autores: Loktionov, Y.
Cet article décrit les résultats d’une analyse du niveau de corrélation entre les températures d’eau près de la bouée Bayadère (20°40’N – 17°04’W) et l’intensité de l’upwelling dans le secteur du Cap Blanc. La relation entre les températures d’eau et l’activité du vent (Indice d’upwelling) a été étudiée en intégrant la variabilité saisonnière des conditions thermiques dans cette région. Une modification de cette relation en fonction des saisons hydrologiques a été mise en évidence.
Tipo: Journal Contribution
Palavras-chave: Seasonal distribution; Seasonal variations; Surface currents; Surface temperature; Temperature; Upwelling; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1989
URL: http://hdl.handle.net/1834/1143

Seasonal variation of antibacterial activity of the brown alga padina pavonica (l) thivy collected from northern coast of tunisia
Provedor de dados: 20
Autores: Ben Ali, A. I.; Ktari, L.; Boudabbous, A.; El Bour, M.
L’algue brune Padina pavonica a été récoltée durant une période d’une année (Juillet 2006 à Juin 2007), dans la côte nord de la Tunisie (Cap Zebib) en vue d'évaluer l'activité antibactérienne d’extraits bruts de l’algue et leur variabilité saisonnière. Les extraits d’algue ont été préparés en utilisant le  Dichlorométhane et le Dichlorométhane/Méthanol et testés périodiquement (tous les mois) sur une gamme de bactéries pathogènes et des bactéries associées isolées de l’algue. Une variation significative de l'activité antibactérienne liée au solvant d’extraction utilisé a été notée. Ainsi, les extraits au Dichloromethane/Méthanol sont plus actifs. Aussi nous avons noté la présence d’une variabilité saisonnière de l'activité antibactérienne. Ce sont les...
Tipo: Journal Contribution
Palavras-chave: Bacteria; Pathogenic bacteria; Seasonal variations; Antibacterials; Algae.
Ano: 2010
URL: http://hdl.handle.net/1834/4699

Variación estacional de las características químicas de las aguas ecuatoriales subsuperficiales al oeste de las Islas Galápagos en el área de ocurrencia de la corriente de Cromwell (1988-2002)
Provedor de dados: 20
Autores: Burgos, L.; Palacios, C.
Este estudio se lo realizó al oeste de las Islas Galápagos de los diferentes cruceros oceanográficos realizados desde 1988 hasta el 2002, con el propósitoo de conocer las características hidroquímicas de las Aguas Ecuatoriales Subsuperficiales (AESS), las cuales se estima mantienen relación con el flujo y aporte de la Corriente de Cromwell que tiene su mayor incidencia en esta área y su comportamiento estacional frente a los cambios climáticos en época húmeda (Marzo-Mayo) y seca (Agosto-Septiembre).
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Chemical oceanography; Nutrients (mineral); Thermohaline circulation; Dissolved oxygen; Multiship expeditions; Dissolved oxygen; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 2002
URL: http://hdl.handle.net/1834/2234

Die Hydroiden der Ciénaga Grande de Santa Marta (Kolumbien) und einiges zu ihrer Ökologie
Provedor de dados: 20
Autores: Wedler, E.
En la Ciénaga Grande de Santa Marta viven dos especies de hidróides estuáricas: Calyptospadix cerula Clarke, 1882 y Cordylophora caspia Pallas, 1771. C. caspia, encontrada hasta ahora solo en el canal frente a los Cocos, está completamente desarrollada en salinidades de 0 a 10°/o/o. C. cerula es eurihalina y existe en salinidades de aprox. 3°/o/o hasta valores completamente marinos. Si la salinidad es inferior a 3°/o/o, esta especie pasa a la fase de menontes. El cambio de actividad de ambas especies depende de la salinidad y probablemente también de la temperatura. En C. caspia, la madurez coincide con el período de agua dulce, mientras C. cerula tiene gonóforos desde comienzos de junio hasta fines de septiembre. Si la salinidad en la Ciénaga Grande es...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Seasonal variations; Estuaries; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1973
URL: http://hdl.handle.net/1834/3309

Cambios de la densidad de los cladóceros P. avirrostris y E. tergentina durante las épocas cálidas y frías (Dic. 2004 y nov. 2005) en la Bahía de Santa Elena (La Libertad - Ecuador)
Provedor de dados: 20
Autores: Andrade, C.
El objetivo del presente estudio es determinar los cambios poblacionales durante las estaciones cálida y fría de este grupo taxonómico y del zooplancton acompañante más abundante en aguas de la Bahía de Santa Elena vs. las variables ambientales temperatura y salinidad.
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Seasonal variations; Coastal waters; Community composition; Population number; 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/1834/2345

Time series of ocean measurements. Volume 2 - 1984
Provedor de dados: 20
Tipo: Book
Palavras-chave: Oceanography; Oceanographic data; Oceanography; Oceanographic surveys; Time series analysis; Sea level measurement; Sea level changes; Seasonal variations; Time series analysis; Oceanography; Http://aims.fao.org/aos/agrovoc/c_28778; Http://aims.fao.org/aos/agrovoc/c_12889.
Ano: 1985
URL: http://hdl.handle.net/1834/2737

Monitoreo de las condiciones bio-oceanográficas entre la I y IV Regiones, año 2005. Informe Final corregido. 2da. Versión
Provedor de dados: 20
Autores: Braun, M.; Valenzuela, V.; Reyes, H.; Castillo, J.; Pizarro, M.; Catasti, V.; Saavedra, J.; Letelier, J.
En el presente informe se entregan los resultados de las condiciones oceanográficas fisico-químicas, la distribución geográfica, abundancia y variabilidad estacional e interanual de huevos y larvas de anchoveta, sardina, jurel y caballa y la distribución espacial e índices de densidad y cobertura geográfica de los recursos detectados por medio de técnicas hidroacústicas entre la I y IV Regiones, obtenidos durante los cruceros estacionales realizados en invierno y primavera de 2005 y verano de 2006.
Tipo: Report
Palavras-chave: Echo surveys; Geographical distribution; Abundance; Seasonal variations; Fish eggs; Fish larvae; Physical oceanography; Chemical oceanography; Geographical distribution; Physical oceanography; Fish larvae; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_5830; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 2007
URL: http://hdl.handle.net/1834/1850

La comunidad bentónica intermareal de Brachidontes rodriguezii (D'Orb.) y su relación con el efluente cloacal de la ciudad de Mar del Plata (38° S)
Provedor de dados: 20
Autores: Vallarino, E.A.
El mitílido Brachidontes rodriguezii es el organismo estructurante de una compleja comunidad intermareal que se desarrolla sobre los sustratos intermareales duros (cuarcíticos y limo- loessoides), en el sudeste de la provincia de Buenos Aires (Argentina). El presente estudio se desarrolló durante los años 1997, 1998, 1999 y 2000, en áreas costeras de los alrededores de Mar del Plata (Camet); Santa Clara del Mar (Santa Elena) y en Mar de Cobo. Se determinaron cuatro estaciones de muestreo en la zona de Camet (área impactada) y dos áreas control en Santa Elena y Mar de Cobo. En cada muestreo se tomaron muestras biológicas, de sedimento retenido y de Materia orgánica, así como de las variables ambientales: temperatura, salinidad, oxígeno disuelto, turbidez y...
Tipo: Theses and Dissertations
Palavras-chave: Intertidal environment; Biological sampling; Environmental factors; Pollution effects; Spatial variations; Seasonal variations; Biomass; Intertidal environment; Environmental factors; Biomass.
Ano: 2002
URL: http://hdl.handle.net/1834/2955

Towards the development of environmental indices for the Namibian shelf, with particular reference to fisheries management.
Provedor de dados: 20
Autores: Bartholomae, Ch.; Van der Plas, A.
The Namibian Ministry of Fisheries and Marine Resources has the task of collecting and providing relevant oceanographic information for management of their fisheries. However, quality information is difficult to provide because of the complexity of the processes involved in the Namibian marine ecosystem. Nonetheless, there are oceanographic data available that can contribute to fisheries management by improving the general understanding of important oceanographic processes related to fisheries. The focus of this paper is on the development of simple environmental indices that can serve as a measurement or proxy of the state or intensity of certain important oceanographic processes or variables for temporal comparison. These indices relate to oceanographic...
Tipo: Journal Contribution
Palavras-chave: Fisheries management; Marine resources; Oceanographic data; Chlorophylls; Upwelling; Spatial variations; Sardine fisheries; Water temperature; El Nino phenomena; Ecosystems; Fish stocks; Surface temperature; Oxygen; Phytoplankton; Biomass; Seasonal variations; Fronts; Perturbations; Commercial fisheries; Catchability; Remote sensing; Chlorophylls; Dissolved oxygen; Environmental impact.
Ano: 2007
URL: http://hdl.handle.net/1834/4971

Variabilidad estacional e inter-anual en estaciones a 10 millas de la costa en el periodo 2004-2008
Provedor de dados: 20
Autores: Cuadra, T. de la.
Se presenta un análisis de los datos oceanográficos (físicos y químicos) y meteorológicos, registrados en tres estaciones localizadas a 10 millas fuera de la costa del Ecuador: estación Esmeraldas ubicada en 104.8 N y 7944.3 W, estación Punta Galera ubicada en 052.5 N y 8012.2 W, y la estación Puerto López ubicada en 135.4 S y 8059.4 W. Los resultados del análisis indican en términos generales, una mayor variabilidad en los 30-50 m de profundidad durante el período 2004-2008. Sugiere además que los años  2007 y 2004 habrían sido fríos; y que el 2006 y 2008 habrían sido cálidos. El análisis de varianzas (ANOVA) mostró una significativa variabilidad interanual en la estación de Pta. Galera (F(2,24)=17.705 p&lt;0.05), y (F(4,40)=3.63 p&lt;0.05) en la...
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Ocean surface temperature; Oceanographic data; El Nino phenomena; Anomalies.
Ano: 2009
URL: http://hdl.handle.net/1834/4785

Seasonal variations in some physiochemical parameters of the Bonny estuary, Niger delta.
Provedor de dados: 20
Autores: Dublin-Green, C.O.
This study is based on eight research cruises carried out on the bonny river system from December 1986-september 1988.  Variations in some physico-chemical parameters of water [Transparency, temperature, pH, DO, salinity, conductivity, PO4, NH4 SiO2 and alkalinity] observed at 10 stations located in the main channel of the river are presented.  Results showed that salinity, conductivity, pH, DO, and alkalinity exhibited spatial and temporal variations. In general, the upper estuary was slightly acidic while the middle and lower estuary were alkaline .A slight decrease in water temperature with depth was observed in most of the stations.  The amplitude of variation in surface and bottom water temperature was generally between 0.5-2oC.  Significant salinity...
Tipo: Report
Palavras-chave: Physicochemical properties; Seasonal variations; Physicochemical properties.
Ano: 1990
URL: http://hdl.handle.net/1834/2408

Variación estacional de las especies del microbentos de la Bahía Manta en la costa ecuatoriana, durante 2011
Provedor de dados: 20
Autores: Gualancañay, E.
Durante la estación lluviosa (marzo 2011), las especies identificadas de la microfauna bentónica en el área de la bahía de Manta son: Bulimina pulchella, Buliminella elegantissima, Cibicides bertheloti, F. boueana, Nonion pizarrense, Quinqueloculina lamarckiana, Rotalia beccarii, Lagena striata y la única especie de la microflora béntica fue Coscinodiscus perforatus y corresponden a la provincia zoogeográfica panameña propuesta por Boltovskoy (1965) y confirmada por Boltosvskoy y Gualancañay (1975) y Gualancañay (1986). Durante la fase seca (septiembre 2011), la microflora béntica estuvo representada por dos especies de diatomeas bénticas: Cocinodiscus perforatus y Polymixus coronalis. En cambio la microfauna bentónica se la halló distribuida en el área de...
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Microorganisms; Benthos; Diatoms; Biogeography; Rainy season; Dry season.
Ano: 2012
URL: http://hdl.handle.net/1834/4708

Variación estacional del zooplancton en el sector estuarial de la laguna Mar Chiquita. Su relación con algunas variables ambientales.
Provedor de dados: 20
Autores: Firpo, C.
El zooplancton de lagunas costeras se caracteriza por su baja diversidad y la dominancia de algunas especies que toleran sus condiciones ambientales cambiantes. La laguna costera Mar Chiquita está ubicada a los 37º32'S - 37º45’S y 57º19’-57º26’ W, posee un cuerpo lagunar de escasa profundidad y un canal por el cual se conecta con el mar, que posee características estuariales. Dada la escasa información referida al zooplancton de esta laguna el presente trabajo tiene como objetivo describir la taxocenosis del zooplancton, las variaciones estacionales de la abundancia y diversidad y la relación de dichas variaciones con la salinidad y temperatura, para dos estaciones ubicadas en el sector estuarial. Los muestreos mensuales se realizaron en dos estaciones...
Tipo: Theses and Dissertations
Palavras-chave: Zooplankton; Seasonal variations; Environmental conditions; Abundance; Community composition; Brackishwater environment; Coastal lagoons; Zooplankton; Environmental conditions; Coastal lagoons.
Ano: 2002
URL: http://hdl.handle.net/1834/3911

El aceite de pescado argentino y sus posibilidades de utilización en procesos industriales. Parte 1. Variación estacional de sus propiedades y composición en ácidos grasos
Provedor de dados: 20
Autores: Cuello, O.M.; Carrizo, J.C.R.
As a result of preliminary works, it is possible to conclude that the argentine fish oils could be proper raw materials for the preparation of sulfated oils and another industrial products. In this work, the physicochemical properties and the fatty acid composition of twelve samples of fish oils were determined monthly during a year in order to evaluate their seasonal variations and the probable incidence on their potential applications.
Tipo: Journal Contribution
Palavras-chave: Fish oils; Fatty acids; Seasonal variations; Organoleptic properties; Fish oils; Fatty acids; Organoleptic properties; Http://aims.fao.org/aos/agrovoc/c_2926; Http://aims.fao.org/aos/agrovoc/c_2818; Http://aims.fao.org/aos/agrovoc/c_5399.
Ano: 1986
URL: http://hdl.handle.net/1834/2036

Variación estacional de la posición del frente ecuatorial y su efecto sobre la fertilidad de las aguas superficiales ecuatorianas
Provedor de dados: 20
Autores: Trejos de Suescum, R.; Okuda, T.; Valencia T., M.; Rodríguez, A.
En este trabajo se analiza una posible correlación entre las condiciones meteorológicas y los patrones oceanográficos en las aguas costeras ecuatorianas, especialmente en relación con la ubicación del Frente Ecuatorial.
Tipo: Journal Contribution
Palavras-chave: Water surface temperature; Seasonal variations; Oceanic fronts.
Ano: 1983
URL: http://hdl.handle.net/1834/2094

Régime alimentaire du diagramme gris "Plectorhynchus mediterraneus" (guichenot, 1850), (poisson, haemulidae) des côtes Mauritaniennes
Provedor de dados: 20
Autores: Gandega, Ch.; Dia, M.; Ghorbel, M.
Le régime alimentaire de diagramme gris Plectorhynchus mediterraneus, étudié en fonction des saisons et de la taille, a porté sur 488 spécimens de longueurs à la fourche (Lf) variant entre 17,2 et 42,1 cm. Le coefficient de vacuité moyen est de 47,95%. Ce poisson se nourrit principalement de Crustacés Amphipodes et secondairement de Crustacés Isopodes. Les Décapodes, les Bivalves, les Céphalopodes et les Annélides sont des proies complémentaires de premier ordre, tandis que les Gastéropodes, les Chordés, les Poissons et les vrais crabes représentent des proies complémentaires de deuxième ordre. Les Crustacés Amphipodes constituent l’aliment de choix de ce poisson pendant toutes les saisons et quelle que soit sa taille.
Tipo: Journal Contribution
Palavras-chave: Diets; Feeding behaviour; Feeding experiments; Food organisms; Seasonal variations; Fish feeding.
Ano: 2009
URL: http://hdl.handle.net/1834/4491

Variación y frecuencia de algunas especies de Rotíferos provenientes de la Ciénaga Grande de Santa Marta (Colombia)
Provedor de dados: 20
Autores: Avila Parga, Guerly.
Se describen las variaciones de seis especies de Rotíferos, en un lapso determinado, con respecto a los fuertes cambios de salinidad que presenta la Ciénaga Grande. Cuatro de las especies pertenecen a la familia Brachionidae siendo tres especies del género Brachionus y una del género Platyias; una especie pertenece al género Lecane (familia Lecanidae) y una al género Filinia de la familia Testudinelidae. También se comunica la existencia, para esa región colombiana, de otros géneros de Rotíferos.
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Plankton; Microorganisms; Seasonal variations; Coastal lagoons; Estuaries; Zooplankton; Plankton; Estuaries; Microorganisms; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_4807; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1973
URL: http://hdl.handle.net/1834/3316

Variación hidroquímica de la zona de afloramiento alrededor de las Galápagos
Provedor de dados: 20
Autores: Trejos de Suescum, R.; Valencia, M.
El presente trabajo establece la variación estacional y geográfica del comportamiento de los diferentes estratos verticales en las zonas estudiadas, en septiembre de 1985 y febrero de 1986, mediante el análisis de los diferentes parámetros físicos y químicos. Se establece la presencia de aguas ecuatoriales sub-superficiales aflorando hacia la capa superficial, en mayor intensidad en septiembre de 1985 y en mínima actividad, en febrero de 1986; manifestándose así la variación estacional en la actividad de la surgencia de la zona.
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Equatorial upwelling; Seasonal variations; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 1986
URL: http://hdl.handle.net/1834/2153

Importance des saisons de transition hydrologique et impact des anomalies climatiques sur l'activité d’une flottille pélagique en ZEE mauritanienne 1985 – 1987
Provedor de dados: 20
Autores: Chavance, P.; Loktionov, Y.; Mahfoudh, M.
Tipo: Journal Contribution
Palavras-chave: Catch/effort; Condition factor; Environmental effects; Environmental impact; Fishery resources; Fishing fleet; Pelagic fisheries; Seasonal distribution; Seasonal variations; Temperature effects; Temporal variations; Upwelling; Environmental impact; Fishery resources; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 1989
URL: http://hdl.handle.net/1834/1144

Description de l'activité des flottilles pélagiques industrielles en 1987 dans la ZEE mauritanienne.
Provedor de dados: 20
Autores: Chavance, P.
En 1987, 59 chalutiers pélagiques (62-102 m, 2000 – 3880 cv) ont opéré dans la ZEE mauritanienne. Trois pays sont représentés : l’URSS, la Roumanie et l’Allemagne de l’Est. Les captures totales atteignent 441473 tonnes dont 66,5% est pêchée par les soviétiques, 26,3% par les roumains et 7,2% par les allemands de l’Est. Les chinchards (&lt;Trachirus sp et Decapterus rhonchus&gt;) prédominent dans les captures avec 50,8%, les sardinelles en représentent 14,9% et la sardine 7,7%. L’activité des flottilles est apparue, comme  en 1986, très marquée par les saisons hydrologiques.
Tipo: Journal Contribution
Palavras-chave: Chalutiers pélagiques; Flottilles industrielles; Captures; Saisons hydrologiques; Commercial fishing; Environmental impact; Fishing effort; Fishing fleet; Pelagic fisheries; Seasonal distribution; Seasonal variations; Temperature effects; Temporal variations; Trawling; Upwelling; Environmental impact; Trawling; Fishing effort; Pelagic fisheries.
Ano: 1988
URL: http://hdl.handle.net/1834/1147

Etude des variations de la biomasse du thiof (&lt;Epinephelus aeneus&gt;) sur les côtes de Mauritanie. Influence de facteurs hydrodynamiques et climatiques
Provedor de dados: 20
Autores: Ould Telmidi, M.
Mémoire de DEA (Spécialité Océanographie et Environnements marins)
Tipo: Theses and Dissertations
Palavras-chave: Biomass; Condition factor; Distribution; Environmental factors; Seasonal variations; Upwelling; Biomass; Distribution; Environmental factors; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_2594.
Ano: 2005
URL: http://hdl.handle.net/1834/1223

Composición y variación estacional del fitoplancton, zooplancton y microbentos en el estuario interior del Golfo de Guayaquil, durante el año 2003
Provedor de dados: 20
Autores: Gualancañay, E.; Tapia, M.E.; Naranjo, Ch.
El presente trabajo comprende el estudio de la distribution cualitativa y cuantitativa del fitoplancton en el Golfo de Guayaquil, durante dos épocas: Húmeda y seca. El propósito del presente trabajo con respecto al zooplankton está orientado a conocer los cambios en la composición, abundancia y diversidad del zooplancton y en particular el Phyllum Chaetognatha con el objetivo de relacionar la distribución de las especies de Quetognatos con los parámetros físicos. En lo relacionado al estudio del microbentos, se pretende estudiar la composición específica y la abundancia relativa de las especies de la microflora béntica y de la microfauna bentónica y su relación con factores ambientales.
Tipo: Journal Contribution
Palavras-chave: Community composition; Seasonal variations; Phytoplankton; Diatoms; Biomass; Zooplankton; Microorganisms; Benthos; Geographical distribution; Estuaries; Phytoplankton; Biomass; Zooplankton; Benthos; Geographical distribution; Estuaries; Diatoms; Microorganisms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_4807.
Ano: 2004
URL: http://hdl.handle.net/1834/2283

Monitoreo de las condiciones bio-oceanográficas entre la I y IV Regiones, año 2005
Provedor de dados: 20
Autores: Braun, M.; Valenzuela, V.; Reyes, H.; Castillo, J.; Pizarro, M.; Catasti, V.; Saavedra, J.
En el presente informe se entregan los resultados de las condiciones oceanográficas físico-químicas, la distribución geográfica, abundancia y variabilidad estacional e interanual de huevos y larvas de anchoveta, sardina, jurel y caballa y la distribución espacial e índices de densidad y cobertura geográfica de los recursos detectados por medio de técnicas hidroacústicas entre la I y IV Regiones, obtenidos durante los cruceros estacionales realizados en invierno y primavera de 2005 y verano de 2006.
Tipo: Report
Palavras-chave: Abundance; Geographical distribution; Fish eggs; Echo surveys; Seasonal variations; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 2006
URL: http://hdl.handle.net/1834/1847

Campos de presión del Pacífico Tropical Suroriental en relación a la Oscilación del Sur: Los índices San Cristóbal/Guayaquil- Darwin
Provedor de dados: 20
Autores: Chavarría, J.; Bayot, B.
En este trabajo se realiza primeramente, un análisis detallado de la variabilidad estacional de los campos de presión en el Pacífico Tropical, como un indicativo de las "condiciones de normalidad". Se hace esta acotación puesto que, los componentes estacionales dependen básicamente de la radiación diferencial que recibe el planeta en sus Hemisferios Norte y Sur (al realizar la rotación anual), lo que exige una repuesta tanto en la atmósfera como en el oceáno. Al respecto, Philander (1990) expresó que el ciclo estacional no puede ser considerado como un agente pasivo, porque éste es la resultante de un acoplamiento oceáno-atmósfera forzado por radiación solar entrante, y que las respuestas a este tipo de forzamiento tienen mucho en común con aquellas que...
Tipo: Journal Contribution
Palavras-chave: Temporal variations; Seasonal variations; Pressure field.
Ano: 1996
URL: http://hdl.handle.net/1834/2247

Variación estacional del fitoplancton en una estación fija en el estero del Muerto durante 1999-2000-2001
Provedor de dados: 20
Autores: Tapia, M.E.
El objetivo del presente estudio es conocer la variación estacional de las especies del fitoplancton y su relación con las condiciones ambientales durante el período en estudio.
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Phytoplankton; Chlorophylls; Diatoms; Environmental conditions; Cell counters; Estuaries; Fixed stations; Marshes; Biomass; Phytoplankton; Estuaries; Biomass; Chlorophylls; Diatoms; Environmental conditions; Marshes; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2006
URL: http://hdl.handle.net/1834/2310

Efecto de la predación de Noctiluca scintillans Macartney, Sagitta friderici Ritter-Záhony y larvas de Engraulis anchoita Hubbs-Marini sobre la comunidad planctónica costera bonaerense
Provedor de dados: 20
Autores: Sato, N.E.
Studied the effect of the predation of Noctiluca scintillans, Sagitta friderici and larvae of Engraulis anchoita in planktonic community of the coastal waters off Buenos Aires province from samples obtained of a permanent station EPEA (38°28’ S, 57°41’ W, 48 m depth) from March 2000 through April 2001. The composition of the diet of the three species predators considering appearances quantitative and qualitative was determined. It found that N. scintillans consumed mainly diatoms and copepod eggs. The alimentary index varied between 27.50% and 77.00%. The highest value corresponded to September, 2000. The analyses of the diets of S. friderici and of the larvae of E. anchoita indicated that both consume mainly different stages of development of the same...
Tipo: Theses and Dissertations
Palavras-chave: Zooplankton; Fish larvae; Feeding behaviour; Predation; Seasonal variations; Food organisms; Predator prey interactions; Engraulis anchoita; Noctiluca scintillans; Sagitta friderici; Marine environment.
Ano: 2008
URL: http://hdl.handle.net/1834/4778

Seasonal variations in some physiochemical parameters of the Bonny estuary, Niger delta.
Provedor de dados: 20
Autores: Dublin-Green, C.O.
This study is based on eight research cruises carried out on the bonny river system from December 1986-september 1988.  Variations in some physico-chemical parameters of water [Transparency, temperature, pH, DO, salinity, conductivity, PO4, NH4 SiO2 and alkalinity] observed at 10 stations located in the main channel of the river are presented.  Results showed that salinity, conductivity, pH, DO, and alkalinity exhibited spatial and temporal variations. In general, the upper estuary was slightly acidic while the middle and lower estuary were alkaline .A slight decrease in water temperature with depth was observed in most of the stations.  The amplitude of variation in surface and bottom water temperature was generally between 0.5-2oC.  Significant salinity...
Tipo: Report
Palavras-chave: Physicochemical properties; Seasonal variations; Physicochemical properties; Http://aims.fao.org/aos/agrovoc/c_13330.
Ano: 1990
URL: http://hdl.handle.net/1834/2408

Efecto de la salinidad y la temperatura sobre el ciclo de vida de cangrejos estuariales (Decapoda, Grapsidae).
Provedor de dados: 20
Autores: Bas, C.
El ciclo de vida de los cangrejos verdaderos (Crustacea, Brachyura) incluye en la mayoria de los casos cuatro etapas. Una etapa embrionaria, en la cual los huevos en desarrollo protegidos por una membrana de varias capas, se mantienen adheridos a los ple6podas de la hembra, expuestos a las mismas condiciones ambientales que el adulto . Posteriormente una etapa larval planct6nica y finalmente una fase juvenil y una adulta, ambas bent6nicas en igual o diferente ambiente . Muy frecuentemente [as historias de vida de los organismos son referidas como rigidamente definidas para cada especie, sin embargo existen numerosos ejemplos en invertebrados donde las caracteristicas del desarrollo y la reproducci6n de una especie son ampliamente influenciadas y...
Tipo: Theses and Dissertations
Palavras-chave: Salinity effects; Temperature effects; Life cycle; Comparative studies; Larval development; Embryonic development; Feeding; Reproduction; Seasonal variations; Feeding; Embryonic development; Life cycle; Reproduction; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2545; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 2001
URL: http://hdl.handle.net/1834/2972

Monitoreo de las condiciones bio-oceanográficas en la I y II Regiones, año 2002
Provedor de dados: 20
Autores: 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

Modelo de regresión lineal múltiple para determinar influencias del índice Niño 1+2 y la MJO sobre las precipitaciones en Guayaquil durante enero-febrero-marzo y abril
Provedor de dados: 20
Autores: Nieto, J.J.
There were elaborated multiple linear regression models to determine the adjustment degree of niño 1+2 and Madden-Julian Oscillation indexes with the accumulated precipitation in Guayaquil, for january, february, march, and april. The correlation models were built separately for each month with time series from 1978 to 2004 of monthly accumulated precipitation, niño 1+2 anomaly, and Madden-Julian Oscillation index for 120W, with a significance level of 95%. It was found that for january, march, and april the linear correlation adjust with coefficients R2 of 0.80, 0.77, and 0.82 respectively. The precipitation levels for february does not showed significant correlation with the indexes, it seems to respond to other factors, presumably atmospheric. There...
Tipo: Journal Contribution
Palavras-chave: Mathematical analysis; Atmospheric precipitations; Atmospheric circulation; Seasonal variations; Surface temperature; Atmospheric circulation; Http://aims.fao.org/aos/agrovoc/c_29546.
Ano: 2007
URL: http://hdl.handle.net/1834/2380

Variaciones estacionales en el crecimiento de larvas de anchoita (Engraulis anchoita).
Provedor de dados: 20
Autores: Leonarduzzi, E.
Age and growth rates of southern anchovy larvae (Engraulis anchoita)were estimated by analysis of daily increments in sagittal otoliths under light microscopy. Samples were collected during 2002 with a bongo net, in the Buenos Aires province, Argentine Sea (SW Atlantic). Otoliths corresponding to 251 larvae (size range 3.5 u 12.2 mm SL)were analyzed. Growth rate estimated as slopes by linear regression of length-age data were 0.50, 0.40, and 0.42 mm/day, and these values corresponded to larvae collected in spring, summer and autumn. Larval growth were significantly distinct between the year seasons (ANCOVA, p&lt;0.01). Recent larval growth expressed as mean growth rates during the last 4 days of the larvae was not correlated with surface temperature. The...
Tipo: Theses and Dissertations
Palavras-chave: Fish larvae; Growth; Otoliths; Seasonal variations; Daily variation; Growth; Otoliths; Fish larvae.
Ano: 2002
URL: http://hdl.handle.net/1834/1484

Dynamics of a macroalgal rocky intertidal community in the colombian Caribbean
Provedor de dados: 20
Autores: García, C.B.; Díaz-Pulido, G.
The macroalgal intertidal community at a tropical location (Punta de la Loma, Colombian Caribbean) was monitored at irregular intervals from 1992 to 1995. The highly diverse macroalgal community was relatively invariant in cover, taxa and biomass from small spatial scales (square centimeters). At larger spatial scales (square meters), however, there was a small but definitive seasonal pulse in dominance and composition. Sand intrusions over the rocky intertidal represents a strong disturbance reducing macroalgal cover during the dry season. Interannual variation was also detected. La Punta de la Loma appears to be influenced by the regional upwelling conditions.
Tipo: Journal Contribution
Palavras-chave: Dynamics; Intertidal environment; Seasonal variations; Spatial variations; Intertidal environment; Http://aims.fao.org/aos/agrovoc/c_3923.
Ano: 2006
URL: http://hdl.handle.net/1834/1977

A seasonally varying biotope at Signy Island, Antarctic: implications for meiofaunal structure
Provedor de dados: 27
Autores: Vanhove, S.; Beghyn, M.; Van Gansbeke, D.; Bullough, L.W.; Vincx, M.
Under the typical high-latitude conditions of temperature, productivity and settlement of chlorophyll and phaeophytin to the sediment, many benthic organisms in the Antarctic show strong seasonal variation. Although meiofauna comprise an important component of the southpolar benthic ecosystem, our knowledge of them is limited. The metazoan meiofauna and the surrounding sediments were studied fortnightly for 18 mo in a shallow bay at Signy Island (Factory Cove, South Orkneys, Antarctica) to test whether and how the temporal variability of the environment influenced meiobenthos dynamics. By examination of the distribution of the abundance and biomass of the total community, the density of higher taxonomic groups, and of individual dominant nematode genera...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthos; Biomass; Population density; Seasonal variations; Sediment analysis; Trophic relationships; Copepoda [copepods]; Nematoda [Nematodes]; Ostracoda.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6138

Determination of seasonal phytoplankton communities, based on quantitative data using a mathematical analysis
Provedor de dados: 27
Autores: Caljon, A.
The definition of algal communities has always been a very discussed subject. We applied a principal component analysis on quantitative phytoplankton data. This ordination technique made it possible to distinguish the algal groups present. This technique is very often applied in the phytosociology of higher plants but less frequently in the phytosociology of algae. Till now this ordination has been used in phycology, merely for marine- and freshwater benthic algae, e.g. the benthic diatoms of rivers (Descy 1976a, b).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community composition; Mathematical analysis; Phytoplankton; Seasonal variations.
Ano: 1978
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3581

Spatial variations at different observational scales and the seasonal distributions of stream macroalgae in a Brazilian subtropical region
Provedor de dados: 88
Autores: Krupek,Rogério Antonio; Branco,Ciro Cesar Zanini; Peres,Cleto Kaveski.
We examined the relationships between environmental variations in lotic ecosystems with the seasonal dynamics of macroalgae communities at different spatial scales: drainage basin of two rivers (Rio das Pedras and Rio Marrecas), shading (open and shaded stream segments), mesohabitat (riffles and pools), and microhabitats. Data collections were made on a monthly basis between January and December/2007. A total of 16 taxa were encountered (13 species and 3 vegetative groups). All of the biotic parameters (richness, abundance, diversity, equitability, and dominance) were found to be highly variable at all of the spatial scales evaluated. On the other hand, abiotic variables demonstrated differences only at mesohabitat (in terms of current velocity) and shaded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterogeneity; Macroalgae; Seasonal variations; Stream.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300004

Qualitative and quantitative assessment of mites (Acari) in domiciliary dust in rural dwellings in the "Zona da Mata" region, Minas Gerais, Brazil
Provedor de dados: 104
Autores: Oliveira,Aristeu José de; Daemon,Erik.
From July to September, 2000 (winter), and from January to March, 2001 (summer), 30 dust samples were collected for each season, from beds of rural dwellings located in farms in the geographical area named "Zona da Mata", Minas Gerais, Brazil. After being sorted, the mites were identified and quantified. The prevalence of mites in the samples was 100%. 891 mites were found in winter (22.97%), and 2988 in summer (77.03%). In winter, Dermatophagoides pteronyssinus (Trouessart, 1897) was the most prevalent (55.00%), followed by Blomia tropicalis (Bronswijk, Cock &amp;amp; Oshima, 1973) (27.06%), Euroglyphus maynei (Cooreman, 1950) (8.85%), and predator mites from Cheyletidae family (8.07%). In summer, the most prevalent species was B. tropicalis (47.79%),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air humidity; Allergens; Allergy; Beds; Countryside; Seasonal variations.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400020

Nutrient budgets (C, N and P) and trophic dynamicsof a Brazilian tropical estuary: Barra das Jangadas
Provedor de dados: 42
Autores: Noriega,Carlos E. D; Araujo,Moacyr.
This paper focuses on the nutrient dynamics of a tropical estuary on the northeastern Brazilian coast, studied using the LOICZ biogeochemical budgeting protocol. We describe the methodology and assumptions underlying this model. Input data (monthly for rainfall, evaporation, river discharge, and concentrations of salt, phosphorus and nitrogen) were obtained during field campaigns in the Barra das Jangadas Estuary (BJE) over a 5 years period (1999 to 2003). Mass balance results indicate large inputs of nutrients to the system. The model shows that the seasonal variation of the Net Ecosystem Metabolism (NEM) indicates that the system passes from a stage of organic matter liquid production and mineralization during the dry season (-0.5 mmoles C m-2 d-1) to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Barra das Jangadas Estuary; Seasonal variations; Heterotrophy; Autotrophy; Carbon dioxide.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200007

Seasonal variations in the heterologous binding of viscacha spermatozoa: A scanning electron microscope study
Provedor de dados: 47
Autores: Aguilera Merlo,Claudia; Muñoz,Estela; Dominguez,Susana; Fóscolo,Mabel; Scardapane,Luis; de Rosas,Juan Carlos.
Seasonal changes in the reproductive activity of the adult male viscacha (Lagostomus maximus maximus) were investigated during the annual reproductive cycle. Assays of heterologous in vitro binding between compatible gametes were used to evaluate the ability of viscacha spermatozoa to achieve primary binding during its annual reproductive cycle. Sperm were collected by mincing cauda epididymis in HECM-3 medium and the sperm concentration and motility were evaluated. Cumulus-free and zona-free oocytes obtained from superovulated hamsters were inseminated in vitro with capacitated sperm suspensions, incubated at 37ºC, 5% CO2 for 3 h, and then processed for studies by scanning electronic microscopy. Statistical analysis was used to compare the quantitative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Viscacha (Lagostomus maximus maximus); Spermatozoa; Heterologous binding; Seasonal variations.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000300001

Four seasons abundance changes of Zalophus californianus californianus (Lesson 1828), Allen, 1880, in the Gulf of California, Mexico
Provedor de dados: 52
Autores: Maravilla-Chávez,M. Octavio; Zavala-González,Alfredo; Ortega-Rubio,Alfredo.
This paper describes for the first time the relative abundance, population structure and numeric variation of California sea lions in the Gulf of California, Mexico, during four different seasons. The relative abundance estimates varied from the highest 17,162 sea lions in July of 1990 (summer) to a minimum 7,470 in February of 1992 (winter), representing a reduction of 10,000 sea lions. Hypotheses about the migration of part of the population to the Pacific Ocean were compared and discussed against their residency inside the Gulf, and seasonal dispersion of individuals along this inner sea.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zalophus californianus californianus; Seasonal variations; Relative abundance; Migration; Gulf of California; Mexico.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100013