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| Registros recuperados: 88 | |
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| Goulletquer, Philippe. |
| The effect of climate changes on marine ecosystems and the ecosystemic services identified in the framework of the World ecosystem assessment program for the millennium (MEA, 2001), is a major scientific issue. In the first place, it seems necessary to identify these changes' characteristics from a physics point of view, as well as from a specific biodiversity (e.g., species distribution areas, exotic and invasive species), populational or marine ecosystem functioning point of view (e.g., trophic chain). However, one of the main difficulties in assessing these impacts results from the superposition and the interactions between natural variability and the different anthropic effects including economic activities (e.g. fisheries). A number of doubts remain,... |
| Tipo: Text |
Palavras-chave: Impact; Biodiversité; Ecosystème marin; Changement climatique. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/acte-6211.pdf |
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| Robert, Stephane; Le Moine, Olivier; Guilpain, Patrice; Soletchnik, Patrick; Faury, Nicole; Razet, Daniel; Geairon, Philippe; Goulletquer, Philippe; Seugnet, Jean-luc. |
| L' apparition de phénomène de prédation des huîtres par des bigorneaux perceurs n'est pas nouveau. Elle a été régulièrement constatée par la profession ostréicole. C'est ainsi qu 'on a pu enregistrer une destruction massive des bancs d'élevage de la baie de Bourgneuf en 1938. Des problèmes similaires ont été enregistrés dans la région de La Rochelle et à Arcachon en 1932, où des subventions on été allouées pour le ramassage d'Ocenebra erinacea. Ces phénomènes étaient alors liés à cette espèce Atlantique. L'apparition d'Ocenebrelilis inornatus, également connu sous le nom d'Ocenebra inornata, a été signalée en 1995 dans le bassin de Marennes Oléron par P.G. Sauriau comme nouvelle espèce de perceurs. Cette description a été concomitante avec l'augmentation... |
| Tipo: Text |
Palavras-chave: Ostréiculture; Impact; Bigorneaux perceurs; Ocenebra erinacea; Ocenebra inornata; Marennes Oléron; Charente-Maritime. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00031/14233/11509.pdf |
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| Merceron, Michel; Bentley, Daniel; Le Grand, Jacqueline; Lamort-datin, Laure; Kempf, Marc. |
| The environmental impact of a brown trout farm located in the Grande Rade de Cherbourg (Normandy) is reported. During observations the fish stock evolved within the range of 140 to 350 metric tons. Farm influence was researched on water column through hydrochemistry, phytoplankton, faecal bacteria and, on bottom, through grain size, organic matter, metals, macrobenthos. This report only deals with water column. Except ammonia, no hydrological parameter seems to be affected, even near to the net pens. Phytoplankton and coliform bacteria were not altered. An extra concentration of ammonia was detected at some tens meters from the raft, with favourable conditions. But generally it was impossible to observe it unless close to the farming structure, downward... |
| Tipo: Text |
Palavras-chave: Channel; Current; Faecal bacteria; Phytoplankton; Hydrology; Impact; Salmonid; Fish farm; Manche; Courant; Bactéries fécales; Phytoplancton; Hydrologie; Impact; Salmonidé; Aquaculture. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/rapport-3342.pdf |
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| Vethaak, A. Dick; Davies, Ian M.; Thain, John E.; Gubbins, Matthew J.; Martinez-gomez, Concepcion; Robinson, Craig D.; Moffat, Colin F.; Burgeot, Thierry; Maes, Thomas; Wosniok, Werner; Giltrap, Michelle; Lang, Thomas; Hylland, Ketil. |
| Many maritime countries in Europe have implemented marine environmental monitoring programmes which include the measurement of chemical contaminants and related biological effects. How best to integrate data obtained in these two types of monitoring into meaningful assessments has been the subject of recent efforts by the International Council for Exploration of the Sea (ICES) Expert Groups. Work within these groups has concentrated on defining a core set of chemical and biological endpoints that can be used across maritime areas, defining confounding factors, supporting parameters and protocols for measurement. The framework comprised markers for concentrations of, exposure to and effects from, contaminants. Most importantly, assessment criteria for... |
| Tipo: Text |
Palavras-chave: Chemical measurements; Biomarker; Bioassay; Pollution effects; Biomonitoring; Environmental; Impact; MSFD; ICES; OSPAR. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00283/39429/37869.pdf |
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| Thebaud, Olivier; Veron, Gerard; Fifas, Spyros. |
| The commercial fishery for wedge clam, or telline (Donax trunculus) in the bay of Douarnenez in France started in the early 1980ies. During twenty years, the activity has developed, from an opportunistic fishery, into a regular fishing enterprise for 36 fishermen, who derive from it most, if not all, of their revenue. The fishery is nowadays strictly regulated. It is subject to natural variations in the productivity of clam stocks, in relation with meteorological conditions which can strongly affect the stocks. The bay of Douarnenez has been experiencing regular blooms of harmful algae, both of species leading to shellfish poisoning for human consumption, such as Dinophysis (Diarrhoeic Shellfish Poisoning) and Pseudo-nitzschia (Amnesic Shellfish... |
| Tipo: Text |
Palavras-chave: Temporary fishing ban; Mortality; Economic impact; Fishery; Wedge clam; Donax trunculus; Fermeture temporaire; Mortalité; Impact; Pêcherie; Telline; Donax trunculus. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/rapport-1262.pdf |
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| Tarfaoui, Mostapha; Gning, P.b.; Davies, Peter; Collombet, F. |
| The impact behavior of composite materials has been extensively studied but interest has been centered on flat plates. For underwater applications, thick composite cylinders are employed and several questions must be addressed concerning the influence of accidental impact. The aim of this work is to study the dynamic response of tubular structures. Such structures find many applications but the damage upon impact is not taken into account during their dimensioning. However, at the time of their handling or in service the damage introduced by accidental impact can compromise their capacity to fulfill their function. The cylinders are thick and consist of epoxy matrix and glass fiber reinforcement. After having observed the nature of the damage related to... |
| Tipo: Text |
Palavras-chave: Size effect; Scale effect; Damage; Impact; Filament winding. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2458.pdf |
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| Delesmont, E; Delesmont, Régis; Grossel, Hubert; Le Fevre-lehoerff, Geneviève; Woehrling, Daniel; Dewarumez, Jean-marie; Menu, D.. |
| La stratégie d'étude modifiée en 1989 a pour but de cerner les impacts, par comparaison entre stations et choix d'espèces cibles. La puissance de fonctionnement de la centrale varie au cours de l'année de 4.5 à 6 tranches de 900 MW, le débit de refroidissement varie de 180 à 240 m3/sec. L' échauffement moyen du canal de rej et est de 8.9 0 C. L'eau recyclée es t estimée à 5.4 %. L'impact de transit se traduit par une multiplication intense des Vibrions, un déficit de biomasse chlorophyllienne (60 %), biomasse zooplanctonique (50 %), déficit dans l'abondance des oeufs (30 %) et larves (100 %) de soles. L'impact sur le milieu récepteur est visible dans le compartiment bactérien et sur les espèces benthiques. Le déficit en biomasse benthique subtidale du... |
| Tipo: Text |
Palavras-chave: Sud Mer du Nord; Gravelines; Centrale nucléaire; Impact; Milieux pélagique et benthique; Southern North Sea; Gravelines; Nuclear power plant; Impact Pelagie and benthic ecosystem. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00005/11602/8238.pdf |
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| Loures,Raquel Coelho; Pompeu,Paulo Santos. |
| Damming rivers to generate hydroelectric energy causes a series of changes in the environment, including impacts on the ichthyofauna. Knowledge of the fish community immediately downstream from a hydroelectric dam can help to reduce the negative effects of dam operation, such as fish entrance into the draft tube during turbines maintenance. We evaluated the temporal variation in fish community composition and abundance, near Três Marias Hydroelectric Dam (TMD), and its relationship with abiotic variables. Samples (n = 18) were carried out using gill nets in the tailrace of the dam, over the course of a hydrological year, at six time points during a 24-hour period. Abiotic data were also sampled to assess the relationship with the biotic data. In the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish kill; Ichthyofauna; Impact; Nictemeral; Operation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400006 |
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| Lira,Nibelle A.; Pompeu,Paulo S.; Agostinho,Carlos S.; Agostinho,Angelo A.; Arcifa,Marlene Sofia; Pelicice,Fernando M.. |
| ABSTRACT River regulation has fragmented fluvial ecosystems in South America, affecting fish migration and dispersion dynamics. In response, authorities have installed fish passage facilities (FPF) to mitigate impacts. However, little is known about the geographical distribution of these facilities, and no synthesis of the research effort applied to understanding their functioning and limitations exists. To address this issue, our study gathered the available scientific literature about fishways in South America to provide an overview of studied FPF and associated research effort. We found 80 studies that investigated 25 FPF, mostly ladders installed in the upper reaches of large rivers, particularly in the Paraná River Basin. One important finding is that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Dam; Fishway; Impact; Management. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200217 |
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| ILAC. |
| At a time of rapid environmental, social and technological change, the Institutional Learning and Change (ILAC) Initiative promotes critical reflection and improved ways of working within the Consultative Group on International Agricultural Research (CGIAR). The goal is to enhance the contribution of agricultural research to sustainable poverty reduction. The ILAC Initiative draws on the expanding body of knowledge encompassing complex adaptive systems, innovation processes, organizational learning and program evaluation, and promotes the examination of research paradigms, institutional norms, management practices and professional behaviours. The Initiative aims to improve agricultural research and development efforts in four key areas: a) developing the... |
| Tipo: Report |
Palavras-chave: Learning; Impact; Evaluation; CGIAR; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2005 |
URL: http://purl.umn.edu/52511 |
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| Lewis, Tina D.; Leitch, Jay A.; Meyer, Aaron J.. |
| Wildlife-related recreation is an important source of economic activity in North Dakota. Using primary, survey-based data, the expenditures and economic impacts of hunters and anglers were summarized for the 1996 hunting/fishing seasons. Total resident and nonresident expenditures (including cost of licenses and additional nonresident expenditures not related to hunting/angling) came to $594 million. Almost $144 million of total expenditures was spent in rural areas by nonresidents and urban residents. Resident and nonresident hunters and anglers generated $1.6 billion in total business activity, $250 million in retail trade sales, $393 million in personal income, and supported over 21,000 jobs. These results suggest that North Dakota's resident and... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Hunter; Angler; Expenditures; Impact; North Dakota; Nonresident; Resource /Energy Economics and Policy. |
| Ano: 1998 |
URL: http://purl.umn.edu/23385 |
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| Padmaja, Ravula; Bantilan, Ma Cynthia S.. |
| This paper explores how and to what extent women and men have benefited from the build-up of social capital in technology uptake, and the role of women in this process. Using a case study on Groundnut Production Technology (GPT) in Maharashtra, India, a systematic documentation of the process by which farmers – both men and women - as well as the whole community became empowered through the build-up of social capital is presented. The focus of the paper is on collective action as a mechanism to stimulate gender-equitable change processes. Our evidence suggests that the technology uptake process was enhanced with the build up of social capital, whereby men and women from all class and caste groups came together for improving their livelihoods. Collective... |
| Tipo: Report |
Palavras-chave: Social capital build-up; Gender; Impact; Social networks; Empowerment. |
| Ano: 2007 |
URL: http://purl.umn.edu/47666 |
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| Place, Frank; Franzel, Steven Charles; Noordin, Qureish; Jama, Bashir. |
| This case study explores the development, dissemination, adoption, and impact of improved tree fallows in rural western Kenya. The processes of technology development and dissemination throughout the region are described and analyzed. To analyze adoption and impact, the paper applies a variety of different data collection methods as well as samples from both pilot areas where researchers maintained a significant presence and non-pilot areas where farmers learned of the technologies through other channels. Sample sizes for the quantitative analysis ranged from almost 2,000 households for measuring the adoption process to just over 100 households for measuring impact indicators. Qualitative methods included long-term case studies for 40 households and focus... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agroforestry; Soil fertility; Kenya; Adoption; Impact; Technology; Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/16054 |
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| Pingpoh, David Puewoh; Senahoun, Jean. |
| The trade liberalization has resulted in massive food imports into Cameroon and this is affecting the livelihoods of the farmers, industries, traders, and service providers of the imported foods. Cameroon was selected by FAO as one of the 12 country case studies on the impact of food import surges in developing countries with the overall objective of studying and analyzing the impact of the most prevalent and frequent surge commodities (poultry meat, rice, and vegetable oils) on stakeholders. The methods and analytical approach used for this study are those for WTO Safeguards investigation as outlined in the FAO working document, “Extent and impact of food import surges in developing countries: An analytical approach and research methodology for country... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Impact; Vegetable oils; Import surge; International Relations/Trade. |
| Ano: 2008 |
URL: http://purl.umn.edu/44369 |
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| Registros recuperados: 88 | |
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