|
|
|
| Registros recuperados: 32 | |
|
|
| Thomas, Yoann; Dumas, Franck; Andrefouet, Serge. |
| The black-lip pearl oyster (Pinctada margaritifera) is cultured extensively to produce black pearls, especially in French Polynesia atoll lagoons. This aquaculture relies on spat collection, a process that experiences spatial and temporal variability and needs to be optimized by understanding which factors influence recruitment. Here, we investigate the sensitivity of P. margaritifera larval dispersal to both physical and biological factors in the lagoon of Ahe atoll. Coupling a validated 3D larval dispersal model, a bioenergetics larval growth model following the Dynamic Energy Budget (DEB) theory, and a population dynamics model, the variability of lagoon-scale connectivity patterns and recruitment potential is investigated. The relative contribution of... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Lagoon; Biophysical modelling; Connectivity; Population dynamics; DEB model. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00321/43192/42926.pdf |
| |
|
| |
|
|
| Sconfietti, R; Marchini, A; Occhipinti Ambrogi, A; Sacchi, Cf. |
| The sessile hard bottoms zoobenthos community was studied in three northern Adriatic lagoons (Venice, Caorle and Grado-Marano). On the basis of previous researches (1993-1994 in Venice; 1997 in Grado-Marano), these lagoons had been subdivided into ecological sectors. The time consistency of such a subdivision has been assessed. The largest number of species was found in the lagoon of Venice, showing a high heterogeneity of environments and an intense shipping traffic, coupled with aquaculture activities that favoured the arrival of exotic species. A very poor community of obligate oligohaline species was found in Caorle. The natural and stable environment of Grado-Marano lagoon, with its large area of freshwater influence, hosted an intermediate number of... |
| Tipo: Text |
Palavras-chave: Benthos sessile; Fonds durs; Adriatique; Lagune; Gradient terre–mer; Sessile benthos; Hard bottoms; Adriatic; Lagoon; Continental vs. marine influence. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00322/43284/43019.pdf |
| |
|
|
| Deborde, Jonathan; Abrill, Gwenael; Mouret, Aurelia; Jezequel, Didier; Thouzeau, Gerard; Clavier, Jacques; Bachelet, Guy; Anschutz, Pierre. |
| A study was conducted in Arcachon Bay, France, to determine the effect of seasonal dynamics in a Zostera noltii meadow on P and Fe cycles in the superficial sediments of a tidal mudflat. The redox-sensitive Fe particulate pool and associated P in the root zone showed a seasonal variation following the growth and decay of Z. noltii biomass, with a maximum content during the growth period. In comparison, the bare sediments did not show significant seasonal changes. A dissolved inorganic phosphorus (DIP) uptake was measured from the water column to the sediment in vegetated sediments, whereas a net DIP efflux was observed in the unvegetated sediments. During the growth period, the formation of an iron oxihydroxide-rich zone occurred and acted as a trap for... |
| Tipo: Text |
Palavras-chave: Nutrient; Eelgrass growth; Intertidal zone; Lagoon; Early diagenesis. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00603/71539/69966.pdf |
| |
|
| |
|
|
| Neveux, Jacques; Lefebvre, Jean-pierre; Le Gendre, Romain; Dupouy, Cecile; Gallois, Francis; Courties, Claude; Gerard, Philippe; Fernandez, Jean-michel; Ouillon, Sylvain. |
| During the Echolag cruise (13 February-8 March 2007), the effect of 16-30 knot trade winds on abundance, community structure and dynamics of phytoplankton was investigated in the southern part of the New Caledonian coral reefs and surrounding oceanic waters. In this area, the coral reefs form two horn-like structures (hereinafter referred to as 'horn reefs'), oriented south-east, and separated by a relatively deep valley. Three repeated samplings at one week intervals of a 32 station array showed that trade winds induce surface water cooling and significant enrichment of mid- and bottom waters above the reef shelf. This enrichment appeared as the result of a general rise of the oceanic thermocline and nitracline due to the combination of trade winds and... |
| Tipo: Text |
Palavras-chave: Chlorophyll; Phycoerythrin; Flow cytometry; Phytoplankton; In vivo fluorescence; Growth rate; Trade winds; Lagoon; Internal wave; New Caledonia. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00013/12437/9258.pdf |
| |
|
|
| Corsi, I; Mariottini, M; Sensini, C; Lancini, L; Focardi, S. |
| Biological responses and contaminant levels in biological tissues were investigated in fish specimens of grass goby (Zosterisessor ophiocephalus) collected in spring 2000 in a moderately polluted brackish ecosystem, the Orbetello lagoon (southern coast of Tuscany, Italy). The complexity of harmful effects that contaminants may cause in fish over time was assessed. General condition indices (somatic liver index, and gonadal somatic index), cytochrome P450 enzymes, acetylcholinesterase activity and ovarian morphology were integrated with the content of organochlorines (OCs-hexachlorobenzene, DDTs and polychlorinated biphenyls) in liver and ovaries and p-nonylphenol (NP) and lower ethoxylate (NPE(1-2)) content in muscle and ovaries as well. Samples collected... |
| Tipo: Text |
Palavras-chave: Biomarqueurs; Lagunes; Poissons; Histologie des ovaires; Organochlorés; Biomarkers; Lagoon; Fish; Ovarian histology; Organochlorines; Nonylphenols. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00322/43293/43028.pdf |
| |
|
|
| Le Moine, Olivier; Geairon, Philippe; Robert, Stephane; Coudray, Sylvain; Fiandrino, Annie; Goraguer, Herle; Goulletquer, Philippe. |
| La dynamique des masses d'eaux et les flux de transit semble favoriser un comblement et/ou des limitations de renouvellement d'eau mettant en péril la durabilité de l’environnement de cette lagune Miquelonnaise. La Préfecture de Saint Pierre et Miquelon et la DTAM, en soutien à la gestion durable de cet environnement, ont sollicité l’Ifremer pour l’évaluation des flux d’alimentation de cette lagune. Une mission sur place a été réalisée en juin 2016 afin de coordonner les actions et effectuer les mesures préliminaires portant sur les jaugeages, la bathymétrie du chenal et la courantométrie horizontale. Ces données ont ensuite été complétées par une acquisition continue des vitesses de courant, avec des données disponibles du 2 juin au 15 novembre 2016, puis... |
| Tipo: Text |
Palavras-chave: Hydrodynamique; Renouvellements; Saint Pierre et Miquelon; Lagune; Grand Barachois; Hydrodynamic; Renewal rates; Saint Pierre et Miquelon; Lagoon; Grand Barachois. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00478/58974/61587.pdf |
| |
|
|
| Chomerat, Nicolas; Garnier, Robert; Bertrand, Céline; Cazaubon, Arlette. |
| The Bolmon lagoon (South of France) is an oligo-mesohaline coastal lagoon that has undergone intense eutrophication in the past decades, resulting from a strong concentration of human activities in its drainage basin. Consequently, it exhibits some characteristics typical of an advanced trophic state; namely, the disappearance of submerged vegetation, the permanently intense phytoplankton growth and the recurrence of cyanoprokaryote blooms. As cyanoprokaryote dominance in south-temperate saline lagoons is little reported, we carried out this study in order to understand the seasonal variations in the phytoplankton composition and biomass, and to analyse the influence of environmental parameters such as salinity, nutrients and climate on the seasonal... |
| Tipo: Text |
Palavras-chave: Turbid state; Pseudanabaena limnetica; Planktothrix agardhii; Phytoplankton; Mediterranean area; Cyanoprokaryotes; Ecology; Lagoon; Brackish water. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2593.pdf |
| |
|
| |
|
|
| Muresan Paslaru, Bogdan; Cossa, Daniel; Jezequel, D; Prevot, F; Kerbellec, S. |
| Solid sediment, pore and epibenthic waters were collected from the Thau lagoon (France) in order to study the post depositional partition and mobility of mercury and monomethylmercury in an organic rich sediment. Total Hg (HgT) and monomethymercury (MMHg) profiles were produced in both dissolved and solid phases. The distribution of HgT in the solid appeared to be related to the historical changes in the Hg inputs into the lagoon. HgT was in equilibrium between solid and solution in the sulfidic part of the cores, with a mean log Kd of 4.9 +- 0.2. The solid appeared to be a source of HgT for pore water in the upper oxic to suboxic parts of the cores. The MMHg represented a small fraction of HgT: 3-15 % and 0.02-0.80 % in the dissolved and in the solid... |
| Tipo: Text |
Palavras-chave: Fluxes; Partition; Sediment; Lagoon; Methylmercury; Mercury. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2083.pdf |
| |
|
|
| Derolez, Valerie. |
| The Thau lagoon is one of the largest Mediterranean coastal lagoons and it supports many uses such as shellfish farming and fishing, priority activities of the territory, and more recently recreational activities. Since the 1960s, the increase in anthropogenic inputs, linked to the sudden growth of the population, led to microbiological contaminations of shellfish and degraded status of the lagoon, with negative impacts at sanitary, ecological and socio‐economic levels. Since the 1970s, the considerable work carried out on the waste water system on the watershed has made it possible to restore the lagoon, which then began an oligotrophication trajectory, a process that has still few been studied in coastal environments. Subject to a variety of pressures... |
| Tipo: Text |
Palavras-chave: Lagoon; Eutrophication; Oligotrophication; Ecological status; Ecosystem services; Socio‐ecosystem; Thau.; Lagune; Eutrophisation; Oligotrophisation; État écologique; Services écosystémiques; Socio‐écosystème; Thau.. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00662/77364/78938.pdf |
| |
|
|
| Pakhomova, Svetlana; Yakushev, Evgeniy; Protsenko, Elizaveta; Rigaud, Sylvain; Cossa, Daniel; Knoery, Joel; Couture, Raoul-marie; Radakovitch, Olivier; Yakubov, Shamil; Krzeminska, Dominika; Newton, Alice. |
| This study presents a specifically designed Mercury module in a coupled benthic-pelagic reactive-transport model - Bottom RedOx Model (BROM) that allows to study mercury (Hg) biogeochemistry under different conditions. This module considers the transformation of elemental mercury (Hg(0)), divalent mercury (Hg(II)) and methylmercury (MeHg). The behavior of mercury species in the model is interconnected with changes of oxygen, hydrogen sulfide, iron oxides, organic matter, and biota. We simulated the transformation and transport of Hg species in the water column and upper sediment layer under five different scenarios, combining various levels of oxygenation and trophic state in the Berre lagoon, a shallow eutrophic lagoon of the French Mediterranean coast... |
| Tipo: Text |
Palavras-chave: Mercury; Methylmercury; Biogeochemical modeling; Anoxia; Eutrophication; Lagoon; BROM. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56535/58239.pdf |
| |
|
| |
|
|
| Loubersac, Lionel; Dahl, Arthur; Collote, Pascal; Lemaire, Olivier; D'Ozouville, Laurent. |
| Damage from tropical cyclones can have major consequences for coral reef structure and ecology, as well as for human communities and human uses of coral reef resources. Remote sensing with high resolution multispectral satellite images can be used to asses large scale cyclone damages on coral reef areas. SPOT images of the almost atoll of AITUTAKI (Cook Islands) taken in june 1986 and february 1987 after the passage of Cyclone Sally near the island in january, were transformed and subjected to a textural analysis, and then compared to asses damage on the reefs and lagoon.New shallow sand and rubble deposits showed increased reflectance, while lower reflectance seemed associated with damage to reef structure, scouring in the lagoon, deposits of terrestrial... |
| Tipo: Text |
Palavras-chave: ICRS 6; Remote sensing; Reflectance; Stresses; Cyclones; Extreme events; Coral reef; Lagoon; Natural System; External Threats & Opportunities. |
| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00143/25380/23518.pdf |
| |
|
|
| Harzallah, Ali; Chapelle, Annie. |
| The Thau lagoon, located in southern France, suffers episodically in summer from anoxic crises known as 'malaigues'. Such crises mostly occur under warm conditions and low winds. In this paper we investigated effects of local weather conditions (air temperature, wind speed and precipitation over southern France), and two climate oscillations (the North Atlantic Oscillation and the El Ni (n) over tildeo Oscillation) on malaigue occurrences based on 33-year data series and dates when malaigues appeared. The study shows that the probability of occurrence of malaigues increases with increasing temperature and decreasing winds in August both mostly associated to the high phase of an index of North Atlantic Oscillation. Malaigues are found to be frequently... |
| Tipo: Text |
Palavras-chave: Lagoon; Thau; Malaigues; Anoxic crises; Climate variability; Lagune; Thau; Malaïgue; Eutrophisation; Variabilité climatique. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-517.pdf |
| |
|
|
| Desclaux, Terence; Lemonnier, Hugues; Genthon, Pierre; Soulard, Benoit; Le Gendre, Romain. |
| The GR4H lumped hourly rainfall–runoff model was assessed for its integration in a ridge-to-reef modelling framework. Particular attention was paid to rainfall representation, robustness of parameter estimates and ability to reproduce main runoff features. The study was conducted in four tropical mountainous watersheds in New Caledonia, exposed to intense rainfall events, large annual climatic variations triggered by El Niño oscillation, and wildfires. The inverse distance and elevation weighting algorithm outperformed other classical rainfall interpolation methods under data-limited conditions. The time-span of data needed for robust calibration was site-specific and varied from 6–7 years to 10 years, which may be linked to El Niño events and to... |
| Tipo: Text |
Palavras-chave: Hydrological model; Ridge-to-reef; GR4H; Rainfall-runoff model; Integrated modelling; New Caledonia; Lagoon; Wildfire. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00455/56681/58466.pdf |
| |
|
|
| Bancon-montigny, Chrystelle; Gonzalez, Catherine; Delpoux, Sophie; Avenzac, Muriel; Spinelli, Sylvie; Mhadhbi, Takoua; Mejri, Kaouther; Hlaili, Asma Sakka; Pringault, Olivier. |
| The potential of remobilization of pollutants is a major problem for anthropogenic ecosystems, because even when the anthropogenic source of pollution is identified and removed, pollutants stored in sediments can be released into the water column and impact pelagic communities during sediment resuspension provoked by dredging, storms or bottom trawling. The objectives of the present study were to assess the changes observed in the chemical composition of the water column following resuspension of a polluted marine sediment and the consequences for the chemical composition of adjacent marine waters according to season. For that purpose, an experimental sediment resuspension protocol was performed on four distinct occasions, spring, summer, fall and winter,... |
| Tipo: Text |
Palavras-chave: Lagoon; Offshore; Trace metal elements; Pesticides; PAHs; Enrichment factor; Elutriate. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61620/65644.pdf |
| |
|
|
| Bebars, Mi; Lasserre, G; Hoai, Tl. |
| Annually exploited communities from the Nile delta and two nearby lagoons (Manzalah and Edkou) were monitored from 1962 to 1989. The changes in community structure were analysed as a function of two events: fishing pressure growth (motorized fishing vessels) which increased by a factor of 19 between 1952 and 1962; and the construction of the Aswan Dam, which was built between 1965 and 1969, reducing the flow of the Nile by 90 %. Before the construction of the dam, increased sea fishing pressure led to a decline in landings from 33,832 tons in 1962 to 8,522 tons in 1969, but with no structural change in the exploited community. However, following completion of the dam in 1969, the community structure changed and a significant correlation was detected... |
| Tipo: Text |
Palavras-chave: Impact; Aswan Dam; Yield; Fisheries; Diversity; Lagoon. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20406/18073.pdf |
| |
|
|
| Millet, B. |
| The wind-driven flow in the closed bassin de Thau is reproduced with a two-dimensional numerical model of horizontal ciruclation using an Alternate Direction Implicit scheme. A stochastic analysis of frequencies on a yearly time scale of the velocity fields computed in the model and a spatial and stochastic treatment of the term (H2 y2), similar to an effective coefficient of horizontal dispersion by shear effect are presented. This approach will allow the delineation, in a stochastic manner, of the main structures of the circulation in the lagoon and the spatial heterogeneity of its ecohydrodynamic features. Two attempts of analogical research are presented, with sorne examples of the spatial structure in the phytoplankton biomass and the map of the... |
| Tipo: Text |
Palavras-chave: Lagune; Modèle; Circulation; Dispersion; Sédiment; Lagoon; Model; Circulation; Dispersion; Sediment. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/00323/43399/43093.pdf |
| |
| Registros recuperados: 32 | |
|
|
|
