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Registros recuperados: 8
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An online tool to easily run stock assessment models, using SS3 and SWO as an example ArchiMer
Nieblas, Anne-elise; Bonhommeau, Sylvain; Imzilen, Taha; Fu, Dan; Fiorellato, Fabio; Barde, Julien.
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00403/51439/52008.pdf
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Defining Mediterranean and Black Sea Biogeochemical Subprovinces and Synthetic Ocean Indicators Using Mesoscale Oceanographic Features ArchiMer
Nieblas, Anne-elise; Drushka, Kyla; Reygondeau, Gabriel; Rossi, Vincent; Demarcq, Herve; Dubroca, Laurent; Bonhommeau, Sylvain.
The Mediterranean and Black Seas are semi-enclosed basins characterized by high environmental variability and growing anthropogenic pressure. This has led to an increasing need for a bioregionalization of the oceanic environment at local and regional scales that can be used for managerial applications as a geographical reference. We aim to identify biogeochemical subprovinces within this domain, and develop synthetic indices of the key oceanographic dynamics of each subprovince to quantify baselines from which to assess variability and change. To do this, we compile a data set of 101 months (2002-2010) of a variety of both "classical'' (i.e., sea surface temperature, surface chlorophyll-a, and bathymetry) and "mesoscale'' (i.e., eddy kinetic energy,...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00239/34995/33536.pdf
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Detection of mesoscale thermal fronts from 4km data using smoothing techniques: Gradient-based fronts classification and basin scale application ArchiMer
Roa Pascuali, Liliana; Demarcq, Herve; Nieblas, Anne-elise.
In order to optimize frontal detection in sea surface temperature fields at 4 km resolution, a combined statistical and expert-based approach is applied to test different spatial smoothing of the data prior to the detection process. Fronts are usually detected at 1 km resolution using the histogram-based, single image edge detection (SIED) algorithm developed by Cayula and Cornillon in 1992, with a standard preliminary smoothing using a median filter and a 3 × 3 pixel kernel. Here, detections are performed in three study regions (off Morocco, the Mozambique Channel, and north-western Australia) and across the Indian Ocean basin using the combination of multiple windows (CMW) method developed by Nieto, Demarcq and McClatchie in 2012 which improves on the...
Tipo: Text Palavras-chave: Mesoscale thermal fronts; Preliminary smoothing; Sea surface temperature; 4 km resolution; Gradient intensity classification; Expert-based approach; Detection efficiency; Indian Ocean.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00269/37998/42023.pdf
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Eating up the world's food web and the human trophic level ArchiMer
Bonhommeau, Sylvain; Dubroca, Laurent; Le Pape, Olivier; Barde, Julien; Kaplan, David; Chassot, Emmanuel; Nieblas, Anne-elise.
Trophic levels are critical for synthesizing species' diets, depicting energy pathways, understanding food web dynamics and ecosystem functioning, and monitoring ecosystem health. Specifically, trophic levels describe the position of species in a food web, from primary producers to apex predators (range, 1-5). Small differences in trophic level can reflect large differences in diet. Although trophic levels are among the most basic information collected for animals in ecosystems, a human trophic level (HTL) has never been defined. Here, we find a global HTL of 2.21, i.e., the trophic level of anchoveta. This value has increased with time, consistent with the global trend toward diets higher in meat. National HTLs ranging between 2.04 and 2.57 reflect a...
Tipo: Text Palavras-chave: Human ecology; Nutrition transition; Trophic ecology.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00171/28190/26609.pdf
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Overfishing causes frequent fish population collapses but rare extinctions ArchiMer
Le Pape, Olivier; Bonhommeau, Sylvain; Nieblas, Anne-elise; Fromentin, Jean-marc.
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00392/50387/51097.pdf
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Prey predator interactions in the face of management regulations: changes in Mediterranean small pelagics are not due to increased tuna predation ArchiMer
Van Beveren, Elisabeth; Fromentin, Jean-marc; Bonhommeau, Sylvain; Nieblas, Anne-elise; Metral, Luisa; Brisset, Blandine; Jusup, Marko; Bauer, Robert Klaus; Brosset, Pablo; Saraux, Claire.
Thunnus thynnus Sardina pilchardus Engraulis encrasicolus
Tipo: Text
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00371/48215/50340.pdf
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Regionalisation of the Mediterranean basin, a MERMEX synthesis ArchiMer
Ayata, Sakina-dorothee; Irisson, Jean-olivier; Aubert, Anais; Berline, Leo; Dutay, Jean-claude; Mayot, Nicolas; Nieblas, Anne-elise; D'Ortenzio, Fabrizio; Palmieri, Julien; Reygondeau, Gabriel; Rossi, Vincent; Guieu, Cecile.
Regionalisation aims at delimiting provinces within which physical conditions, chemical properties, and biological communities are reasonably homogeneous. This article proposes a synthesis of the many recent regionalisations of the open-sea regions of the Mediterranean Sea. The nine studies considered here defined regions based on different, and sometimes complementary, criteria: dynamics of surface chlorophyll concentration, ocean currents, three-dimensional hydrological and biogeochemical properties, or the distribution of organisms. Although they identified different numbers and patterns of homogeneous regions, their compilation in the epipelagic zone identifies nine consensus frontiers, eleven consensus regions with relatively homogeneous conditions,...
Tipo: Text Palavras-chave: Mediterranean Sea; Regionalisation; Biogeochemistry; Circulation; Mesoscale features; Epipelagic ocean; Management; Spatial planning.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00405/51673/52221.pdf
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Sardine ( Sardina pilchardus ) larval dispersal in the Iberian Upwelling System, using coupled biophysical techniques ArchiMer
Santos, Amp; Nieblas, Anne-elise; Verley, P.; Teles-machado, A.; Bonhommeau, Sylvain; Lett, C.; Garrido, S.; Peliz, A..
The European sardine (Sardina pilchardus) is the most important small pelagic fishery of the Western Iberia Upwelling Ecosystem (WIUE). Recently, recruitment of this species has declined due to changing environmental conditions. Furthermore, controversies exist regarding its population structure with barriers thought to exist between the Atlantic-Iberian Peninsula, Northern Africa, and the Mediterranean. Few studies have investigated the transport and dispersal of sardine eggs and larvae off Iberia and the subsequent impact on larval recruitment variability. Here, we examine these issues using a Regional Ocean Modeling System climatology (1989-2008) coupled to the Lagrangian transport model, Ichthyop. Using biological parameters from the literature, we...
Tipo: Text Palavras-chave: Iberian Peninsula; Sardina pilchardus; Larval dispersal; Lagrangian transport; Ichthyop; Regional Ocean Modeling System.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00427/53814/54784.pdf
Registros recuperados: 8
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