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| Registros recuperados: 12 | |
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| Andral, Bruno. |
| La Méditerranée constitue un des pôles mondiaux de biodiversité et un lieu clé des changements climatiques globaux, avec des taux de réchauffement constatés en surface parmi les plus élevés de la planète (~+ 0.06°C/an). Nous pouvons en constater aujourd’hui les premiers symptômes : transformation des écosystèmes et habitats, augmentation de la température de l’eau et son cortège d’espèces exotiques, espèces invasives animales et végétales et leurs impacts sur les espèces indigènes. Les îles, par leur taille, et du fait qu’elles sont moins soumises aux pressions anthropiques directes, sont des laboratoires idéaux pour suivre l’impact des changements globaux sur la biodiversité, sans être perturbé par des effets locaux. Dans le cadre de l'initiative "Petites... |
| Tipo: Text |
Palavras-chave: Changement global; Biodiversité; Communautés benthiques; Poissons; Phytoplancton.. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34388/32782.pdf |
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| Desaunay, Yves; Guerault, Daniel. |
| A beam trawl survey of the Bay of Vilaine was conducted from 1981 to 1997. Changes in the commercial fish community were analyzed by comparing the characteristics at the year and decadal scales. The community structure and nursery function of the Bay were steady during the period. However, specific richness, assiduity and distribution indices demonstrated a reduction in the second decade. The global abundance fell from 105.8 ind.ha-1 to 31.3 ind.ha-1. This trend was less marked for the external more marine stratum, which exhibited the lowest densities. The results are discussed in terms of ecological meaning of such a community, compared with the overall demersal fish community. The reasons of the decrease are questioned regarding nursery habitat, local... |
| Tipo: Text |
Palavras-chave: Habitat; Survey; Bay of Vilaine; Fish community; Habitat; Suivi; Baie de Vilaine; Poissons; Peuplement. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/rapport-1288.pdf |
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| 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 |
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| Grizel, Henri; Berthe, Franck. |
| Les 21 et 22 juin 2000, le Département des Ressources Aquacoles a consacré ses journées annuelles à une revue du thème "santé des cheptels" et du dispositif de recherche en pathologie sur les filières poissons, crustacés et mollusques, domaine très stratégique pour l'aquaculture marine française. Les objectifs des ces journées, rappelés par Yves Harache, Directeur du Département, étaient les suivante : • Dresser le bilan des actions de recherche menées par l'Ifremer en pathologie des espèces aquacoles, • Repréciser la stratégie (objectifs/moyens) du Département des Ressources Aquacoles sur le thème "santé des cheptels", • Programmer les actions de recherche à venir, • Stimuler les interactions entre groupes de recherche et laboratoires impliqués. Le... |
| Tipo: Text |
Palavras-chave: Pathologie; Ecotoxicologie; Mortalités; Ecopathologie; Poissons; Crustacés; Mollusques; Nacres. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00164/27547/25711.pdf |
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| Freon, Pierre. |
| Body length variability bas been studied in fish schools and eohorts of two tropical pelagie species. The data, and simulations associated with them allow the variations in standard deviation of cohorts to be followed, and hypotheses on spawning duration or population structure ean thus be tested. As the fish grow, the variability increases more rapidly in young eohorts than in schools with the same mean length. For older fish, the inverse phenomenon is observed: while the standard deviation of individual lengths deereases in a cohort as it gets older, this parameter continued to inerease in sehools as the mean length increases. This shows that schools of young fish eannot be eonsidered as representative of the cohort length frequency distribution, whereas... |
| Tipo: Text |
Palavras-chave: Poissons; Pélagiques côtiers:; Variabilité des tailles; Cohortes; Bancs; Fish; Coastal pelagic; Length variability; Cohorts; Schools. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/00113/22444/20131.pdf |
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| Bertrand, Jacques; Cochard, Marie-laure; Coppin, Franck; Leaute, Jean-pierre; Lobry, Jeremy; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Rochet, Marie-joelle; Schlaich, Ivan; Souplet, Arnauld; Trenkel, Verena; Verin, Yves; SIH-C. |
| The integration of fishing management into the ecosystemic approach has been recommended for many years by international consultative bodies; it is also written into international conventions and agreements. The implementation of the ecosystemic approach involves the development of programmes for monitoring exploited ecosystems in order to measure the effects of management steps. Plotting the results of these observations for operational reasons requires formalizing summary performance indicators. IFREMER has carried out halieutic observation campaigns for some twenty years along the coasts of France from oceanographic ships and chartered ships. The objective of these campaigns is to produce abundance indices of species that are of halieutic interest.... |
| Tipo: Text |
Palavras-chave: Ecosystem; Indicating; Scientific survey; Scientific research; Fishing; English Channel; Bay of Biscay; France; Shellfish; Fish; Invertébrés; Poissons; Ecosystème; Indicateur; Campagne océanographique; Recherche scientifique; Pêche halieutique; Pêche; Mer du nord; Golfe de gascogne; Manche; France. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/rapport-2327.pdf |
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| Registros recuperados: 12 | |
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