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| Registros recuperados: 199 | |
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| Medernach, L; Gremare, A. |
| We compared the ability of three direct methods (increment summation, loss summation and instantaneous growth rate coefficient), the size-frequency method, and eight indirect methods (Banse and Mosher, Benke, Brey, Edgar, Morin and Bourassa, Plante and Downing, Robertson and Schwinghamer et al.) to measure or to predict the secondary production of a Mediterranean population of the polychaete Ditrupa arietina. This comparison was carried out both on the 1994 cohort during its two-year lifespan and on the entire population during the two years of the study (1994-1996). Our results showed that all three direct methods are more or less equivalent. Results referring to the year 1994-1995 showed a strong overestimation of the actual production by the size... |
| Tipo: Text |
Palavras-chave: Production secondaire; Méthodes; Polychètes; Méditerranée; Secondary production; Methods; Polychaetes; Mediterranean Sea. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43614/43916.pdf |
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| Masse, Hl. |
| At a time when there is a great deal of talk of the degradation of the coastal environment and of biodiversity being threatened, we felt it would be of interest to sample the macrofauna of five sites at five metres depth in well sorted fine sand at a thirty-year interval (1966-1996), using the same techniques. Four seasonal samplings provided comparative data at each site on the species richness (S), density (N) and biomass (B). The S values are comparable and even on the increase at two stations. Nevertheless, we observed a general tendency towards decline in the relative abundance of the crustacean group. From the quantitative point of view (N and B), the changes observed would appear to result from the impact of clearly identifiable human pressure, such... |
| Tipo: Text |
Palavras-chave: Méditerranée; Macrofaune des sables; Variations; Long-terme; Mediterranean; Sand-macrofauna; Changes; Long-term. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00325/43572/44053.pdf |
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| Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Merrien, Claude; Pitel-roudaut, Mathilde; Macher, Claire; Le Grand, Christelle; Demaneche, Sebastien; Jezequel, Michele; Bodere, Erwan; Le Blond, Samuel. |
| This document, which is the eighth edition of a series started in 2000, provides a global overview of the data collected in 2010 as part of the Fisheries Observatory of Ifremer. It aims to present a summary of the activity and economic situation of the French fleets operating in the North Sea, English Channel, Northeast Atlantic and Mediterranean Sea in 2009. It updates the 2008 issue, which was published in 2010. The summary is intended for a wide audience. The document contains several fact sheets: • The first sheet provides a description of the French national fishing fleet (North Sea - Channel, Atlantic and Mediterranean Sea, excluding overseas), including vessel and crew characteristics. It also presents the evolution of the French fishing fleet since... |
| Tipo: Text |
Palavras-chave: Pêche; Typologies; Flottille; Métier; Engin; Indicateurs d’activité; Indicateurs économiques; Mer du Nord; Manche; Atlantique; Méditerranée; France; Fishing sector; Typologies; Fishing fleet; Métier; Gear; Indicators of fishing activity; Economic indicators; North Sea; English Channel; Atlantic; Mediterranean Sea; France. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00042/15352/12707.pdf |
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| Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Merrien, Claude; Pitel-roudaut, Mathilde; Bermell, Sylvain; Brigaudeau, Cecile; Planchot, Marie; Demaneche, Sebastien; Jezequel, Michele; Bodere, Erwan. |
| This document, which is the fifth edition of a series started in 2000, provides a global overview of the data collected in 2007 as part of the Fisheries Observatory of Ifremer. It includes a brief account of the activity and financial situation of the French fleets operating in the North Sea, English Channel, Northeast Atlantic and Mediterranean Sea in 2006 and updates the 2005 issue, which was published in 2006. The summary is intended for a wide audience. The document contains several fact sheets : • The first sheet provides a global description of the French national (excluding overseas) fishing fleet (North Sea - Channel, Atlantic and Mediterranean Sea), including vessel and crew characteristics. It also presents the evolution of the French fishing... |
| Tipo: Text |
Palavras-chave: Pêche; Typologies; Flottille; Métier; Engin; Indicateurs d’activité; Indicateurs économiques; Mer du Nord; Manche; Atlantique; Méditerranée; France; Fishing sector; Typologies; Fishing fleet; Métier; Gear; Indicators of fishing activity; Economic indicators; North Sea; English Channel; Atlantic; Mediterranean Sea; France. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00042/15351/12706.pdf |
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| Registros recuperados: 199 | |
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