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| Registros recuperados: 12 | |
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| Gohin, Francis; Bryere, Philippe; Perrot, Laurie. |
| After several years of experience in providing daily merged products of non-algal Suspended Particulate Matters (SPM) for forcing the light in the ecological model of Previmer ECO-MARS-3D, we have often observed poor quality SPM fields in winter due to the cloud cover. For this reason we propose a new interpolation scheme, multisensor and multitemporal, based on a first-guess field of daily SPM derived from a biweekly satellite climatology modified to take into account dynamically the effects of waves and tides. The contribution of waves and tide is simulated through a simple statistical model (multiplicative effects of the significant wave heights and tidal intensity) summing up the information coming out from the historical data set of SPM. On an... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30799/29168.pdf |
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| Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire; Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe; Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres. |
| This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000 to 2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and... |
| Tipo: Text |
Palavras-chave: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00465/57661/59856.pdf |
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| Han, Bing; Loisel, Hubert; Vantrepotte, Vincent; Meriaux, Xavier; Bryere, Philippe; Ouillon, Sylvain; Dessailly, David; Xing, Qianguo; Zhu, Jianhua. |
| Remote sensing of suspended particulate matter, SPM, from space has long been used to assess its spatio-temporal variability in various coastal areas. The associated algorithms were generally site specific or developed over a relatively narrow range of concentration, which make them inappropriate for global applications (or at least over broad SPM range). In the frame of the GlobCoast project, a large in situ data set of SPM and remote sensing reflectance, R-rs(lambda), has been built gathering together measurements from various coastal areas around Europe, French Guiana, North Canada, Vietnam, and China. This data set covers various contrasting coastal environments diversely affected by different biogeochemical and physical processes such as sediment... |
| Tipo: Text |
Palavras-chave: Specific backscattering coefficient; Empirical algorithm; Semi-analytic algorithm; Coastal waters; Suspended particulate matter; Ocean color. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00589/70062/68010.pdf |
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| Thomas, Yoann; Pouvreau, Stephane; Alunno-bruscia, Marianne; Barille, Laurent; Gohin, Francis; Bryere, Philippe; Gernez, Pierre. |
| Aim The spread of non-indigenous species in marine ecosystems world-wide is one of today's most serious environmental concerns. Using mechanistic modelling, we investigated how global change relates to the invasion of European coasts by a non-native marine invertebrate, the Pacific oyster Crassostrea gigas. Location Bourgneuf Bay on the French Atlantic coast was considered as the northern boundary of C. gigas expansion at the time of its introduction to Europe in the 1970s. From this latitudinal reference, variations in the spatial distribution of the C. gigas reproductive niche were analysed along the north-western European coast from Gibraltar to Norway. Methods The effects of environmental variations on C. gigas physiology and phenology were studied... |
| Tipo: Text |
Palavras-chave: Biogeographical range expansion; Crassostrea gigas; DEB model; European coasts; Functional traits; Global change; Individual-based model; Invasive species; Remote-sensing. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00287/39828/38459.pdf |
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| L'Heveder, Blandine; Speich, Sabrina; Ragueneau, Olivier; Gohin, Francis; Bryere, Philippe. |
| Seasonal Sea Surface Temperature (SST) changes in the Western English Channel have been estimated for the previous decades from high-resolution satellite data. Coastal seas, well separated from offshore waters by intense frontal structures, show colder SST by 1 to 2°C in summer. A significant warming trend is observed in the autumn season. This positive trend is stronger offshore, with an annual mean SST increase of 0.32°C/decade, but weaker in coastal waters (0.23°C/decade), where strong vertical mixing induced by tides and winds acts to reduce surface warming. The performance of an ensemble of CMIP5 climate model in simulating recent seasonal changes of SST in the region is estimated. The median of CMIP5 models reproduces very well the observed SST mean... |
| Tipo: Text |
Palavras-chave: SST; Climate change; Western English Channel; CMIP5; Regional study. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00350/46163/45861.pdf |
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| Rivier, Aurelie; Gohin, Francis; Bryere, Philippe; Petus, Caroline; Guillou, Nicolas; Chapalain, Georges. |
| The study of water clarity is essential to understand variability in biological production, particularly in coastal seas. The spatial and temporal variability of non-algal suspended particulate matter (SPM) in surface waters of the English Channel was investigated and related to local forcing by means of a large satellite dataset covering the study area with a spatial resolution of 1.2 km and a daily temporal resolution. This analysed dataset is a time series of non-algal SPM images derived from MODIS and MERIS remote-sensing reflectance by application of an IFREMER semi-analytical algorithm over the period 2003–2009. In a first step, the variability of time series of MODIS images was analysed through temporal autocorrelation functions. Then, non-algal SPM... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00064/17546/15139.pdf |
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| Pouvreau, Stephane; Bellec, Gwenael; Le Souchu, Pierrick; Queau, Isabelle; Talarmain, Eric; Alunno-bruscia, Marianne; Auby, Isabelle; Maurer, Daniele; Barbier, Claire; Tournaire, Marie-pierre; D'Amico, Florence; Rumebe, Myriam; Fleury, Elodie; Langlade, Aime; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Hitier, Benoist; Bedier, Edouard; Robert, Stephane; Guilpain, Patrice; Grizon, James; Seugnet, Jean-luc; Guesdon, Stephane; Lagarde, Franck; Le Gall, Patrik; Messiaen, Gregory; Roque D'Orbcastel, Emmanuelle; Gohin, Francis; Bryere, Philippe; Quemener, Loic; Repecaud, Michel; Bucas, Karenn; Barbot, Stephane; Guillemot, Anne; Nonnotte, Lidwine; Duros, Wenceslas; Bonnat, Armel; Tarot, Stephane; Mille, Dominique; Geay, Amelie; Bouquet, Anne-lise. |
| La conchyliculture, et principalement l’élevage de l’huître creuse, Crassostrea gigas, constitue la principale activité aquacole française. Cette activité repose, en grande partie, sur le recrutement naturel de l’espèce qui assure 70% des besoins en jeunes huîtres (naissain) : cette activité de collecte s’appelle le captage. Les deux principaux centres de captage en France sont les bassins d’Arcachon et de Marennes-Oléron. Or, depuis une dizaine d'années, sur le Bassin d'Arcachon, le captage devient très variable: à des années de captage nul (par exemple les années 2002, 2005, 2007) ou faible (2009, 2010, 2011) succèdent des années excellentes voire pléthoriques (les années 2003, 2006, 2008, 2012). A Marennes-Oléron, cette variabilité existe, mais s’avère... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00135/24648/22681.pdf |
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| Registros recuperados: 12 | |
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