Consulta: creatorFacets:"Chust, Guillem"
Registros recuperados: 7
Data/hora: 06/06/2024 06:35:52

Estimating turbidity and total suspended matter in the Adour River plume (South Bay of Biscay) using MODIS 250-m imagery
Provedor de dados: 5
Autores: Petus, Caroline; Chust, Guillem; Gohin, Francis; Doxaran, David; Froidefond, Jean-marie; Sagarminaga, Yolanda.
The Basque coastal waters (South Bay of Biscay) are directly influenced by the Adour River freshwater plume. The Adour outflow leads to important variations of suspended matter concentrations and turbidity, which in turn may affect biological productivity and water quality. This study aims at both developing specific algorithms and testing the efficiency of atmospherically corrected MODIS-Aqua 250-m surface reflectance product (MYD09) to map total suspended matter concentrations and turbidity within the Adour coastal region. First, regional empirical algorithms based on in-situ data were tested to retrieve the concentration of total suspended matter and turbidity from the remote sensing reflectance. Then, the respective sensitivity of MODIS surface...
Tipo: Text
Palavras-chave: Adour River plume; Turbidity; Suspended matter; Satellite sensing; MODIS; Remote sensing reflectance.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11383/8042.pdf

Global habitat preferences of commercially valuable tuna
Provedor de dados: 5
Autores: Arrizabalaga, Haritz; Dufour, Florence; Kell, Laurence; Merino, Gorka; Ibaibarriaga, Leire; Chust, Guillem; Irigoien, Xabier; Santiago, Jose Luis; Murua, Hilario; Fraile, Igaratza; Chifflet, Marina; Goikoetxea, Nerea; Sagarminaga, Yolanda; Aumont, Olivier; Bopp, Laurent; Herrera, Miguel; Fromentin, Jean-marc; Bonhomeau, Sylvain.
In spite of its pivotal role in future implementations of the Ecosystem Approach to Fisheries Management, current knowledge about tuna habitat preferences remains fragmented and heterogeneous, because it relies mainly on regional or local studies that have used a variety of approaches making them difficult to combine. Therefore in this study we analyse data from six tuna species in the Pacific, Atlantic and Indian Oceans in order to provide a global, comparative perspective of habitat preferences. These data are longline catch per unit effort from 1958 to2007 for albacore, Atlantic bluefin, southern bluefin, bigeye, yellowfin and skipjack tunas. Both quotient analysis and Generalized Additive Models were used to determine habitat preference with respect to...
Tipo: Text
Palavras-chave: Habitat; Tuna fisheries; Catch/effort; Environmental conditions; Quotient analysis; Generalised Additive Models; Ecosystem Approach to Fisheries Management.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00201/31190/29589.pdf

Mare Incognitum: A Glimpse into Future Plankton Diversity and Ecology Research
Provedor de dados: 5
Autores: Chust, Guillem; Vogt, Meike; Benedetti, Fabio; Nakov, Teofil; Villeger, Sebastien; Aubert, Anais; Vallina, Sergio M.; Righetti, Damiano; Not, Fabrice; Biard, Tristan; Bittner, Lucie; Benoiston, Anne-sophie; Guidi, Lionel; Villarino, Ernesto; Gaborit, Charlie; Cornils, Astrid; Buttay, Lucie; Irisson, Jean-olivier; Chiarello, Marlene; Vallim, Alessandra L.; Blanco-bercial, Leocadio; Basconi, Laura; Guilhaumon, Francois; Ayata, Sakina-dorothee.
With global climate change altering marine ecosystems, research on plankton ecology is likely to navigate uncharted seas. Yet, a staggering wealth of new plankton observations, integrated with recent advances in marine ecosystem modeling, may shed light on marine ecosystem structure and functioning. A EuroMarine foresight workshop on the “Impact of climate change on the distribution of plankton functional and phylogenetic diversity” (PlankDiv) identified five grand challenges for future plankton diversity and macroecology research: (1) What can we learn about plankton communities from the new wealth of high-throughput “omics” data? (2) What is the link between plankton diversity and ecosystem function? (3) How can species distribution models be adapted to...
Tipo: Text
Palavras-chave: Plankton; Macroecology; Species distribution; Functional diversity; Climate change; Habitat modeling.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00625/73739/74755.pdf

Biomass changes and trophic amplification of plankton in a warmer ocean
Provedor de dados: 5
Autores: Chust, Guillem; Allen, J. Icarus; Bopp, Laurent; Schrum, Corinna; Holt, Jason; Tsiaras, Kostas; Zavatarelli, Marco; Chifflet, Marina; Cannaby, Heather; Dadou, Isabelle; Daewel, Ute; Wakelin, Sarah L.; Machu, Eric; Pushpadas, Dhanya; Butenschon, Momme; Artioli, Yuri; Petihakis, Georges; Smith, Chris; Garcon, Veronique; Goubanova, Katerina; Le Vu, Briac; Fach, Bettina A.; Salihoglu, Baris; Clementi, Emanuela; Irigoien, Xabier.
Ocean warming can modify the ecophysiology and distribution of marine organisms, and relationships between species, with nonlinear interactions between ecosystem components potentially resulting in trophic amplification. Trophic amplification (or attenuation) describe the propagation of a hydroclimatic signal up the food web, causing magnification (or depression) of biomass values along one or more trophic pathways. We have employed 3-D coupled physical-biogeochemical models to explore ecosystem responses to climate change with a focus on trophic amplification. The response of phytoplankton and zooplankton to global climate-change projections, carried out with the IPSL Earth System Model by the end of the century, is analysed at global and regional basis,...
Tipo: Text
Palavras-chave: Ecosystem model; Food web; Plankton; Primary production; Sea warming; Trophic amplification.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29966/28481.pdf

Les ressources exploitées par la pêche et la conchyliculture
Provedor de dados: 5
Autores: Caill-milly, Nathalie; Morandeau, Gilles; Castege, Iker; Sanchez, Florence; Lissardy, Muriel; Chust, Guillem; Borja, Angel; Auby, Isabelle; Lapegue, Sylvie; Prou, Jean; Oger-jeanneret, Helene; Lassalle, Géraldine; Prevost, Etienne; Buoro, Mathieu; Lobry, Jérémy; De Pontual, Helene; De Casamajor, Marie-noelle; Biais, Gerard; D'Elbee, Jean.
L'exploitation des ressources par la pêche professionnelle et par la conchyliculture repose sur des ressources vivantes sauvages ou domestiquées qui sont présentes dans différents milieux aquatiques depuis les rivières jusqu'au large en mer. L'état de ces populations dépend non seulement des choix d'exploitation au regard des capacités de renouvellement des stocks mais aussi des caractéristiques environnementales qui impactent les différentes phases des cycles biologiques des espèces et jouent donc sur leur bon déroulement. Ces conditions du milieu sont tributaires pour partie des activités anthropiques (qualité et quantité d'eau disponible, obstacles au franchissement, autres perturbations) et peuvent être soumises aux effets du changement climatique. Ce...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55568/57180.pdf

The North Atlantic Ocean as habitat for Calanus finmarchicus: Environmental factors and life history traits
Provedor de dados: 5
Autores: Melle, Webjorn; Runge, Jeffrey; Head, Erica; Plourde, Stephane; Castellani, Claudia; Licandro, Priscilla; Pierson, James; Jonasdottir, Sigrun; Johnson, Catherine; Broms, Cecilie; Debes, Hogni; Falkenhaug, Tone; Gaard, Eilif; Gislason, Astthor; Heath, Michael; Niehoff, Barbara; Nielsen, Torkel Gissel; Pepin, Pierre; Stenevik, Erling Kaare; Chust, Guillem.
Here we present a new, pan-Atlantic compilation and analysis of data on Calanus finmarchicus abundance, demography, dormancy, egg production and mortality in relation to basin-scale patterns of temperature, phytoplankton biomass, circulation and other environmental characteristics in the context of understanding factors determining the distribution and abundance of C. finmarchicus across its North Atlantic habitat. A number of themes emerge: (1) the south-to-north transport of plankton in the northeast Atlantic contrasts with north-to-south transport in the western North Atlantic, which has implications for understanding population responses of C. finmarchicus to climate forcing, (2) recruitment to the youngest copepodite stages occurs during or just after...
Tipo: Text
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00213/32435/30903.pdf

Present and Future Potential Habitat Distribution of Carcharhinus falciformis and Canthidermis maculata By-Catch Species in the Tropical Tuna Purse-Seine Fishery under Climate Change
Provedor de dados: 5
Autores: Lezama-ochoa, Nerea; Murua, Hilario; Chust, Guillem; Van Loon, Emiel; Ruiz, Jon; Hall, Martin; Chavance, Pierre; De Moline, Alicia Delgado; Villarino, Ernesto.
By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis) and a teleost (Canthidermis maculata) in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM) was developed using data collected by observers in tuna purse seiners. The relative percentage of contribution of some environmental variables (depth, sea surface temperature, salinity and primary production) and the potential impact of climate change on species habitat by the end of the century under the A2...
Tipo: Text
Palavras-chave: By-catch; MaxEnt; Silky shark; Rough triggerfish; Habitat suitability; Climate change; Tropical purse seiners; Ecosystem approach to fishery management.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00677/78903/81246.pdf