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| Druon, Jean-noel; Helaouet, Pierre; Beaugrand, Grégory; Fromentin, Jean-marc; Palialekis, Andreas; Hoepffner, Nicolas. |
| This study investigates the association between an index of mesozooplankton biomass, derived from the Continuous Plankton Recorder survey and satellite-derived productivity fronts in the North Atlantic. While chlorophyll-a content (CHL) is commonly described as a proxy for phytoplankton biomass, the size of productivity fronts estimated from the horizontal gradient of CHL appears to be directly linked to mesozooplankton biomass. Our results suggest that the lifespan of productivity fronts, which ranges from weeks to months, meets the time requirement of mesozooplankton to develop. The proposed indicator describes the daily distribution of mesozooplankton’s suitable feeding habitat. It also provides a coherent interpretation of the productivity front... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00486/59744/62843.pdf |
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| Gascuel, Didier; Merino, G.; Doering, R.; Druon, Jean-noel; Goti, L.; Guenette, S.; Macher, Claire; Soma, K.; Travers-trolet, Morgane; Mackinson, Steve. |
| Using the Celtic Sea and the North Sea as case studies, the fleet-based approach is shown to be the pathway to implement an effective ecosystem approach to fisheries management (EAFM) in European seas. First, a diagnostic on the health of each ecosystem is proposed based on the reconstruction of long time-series of catch, the analysis of mean indicators or stocks trajectories derived from ICES stock assessment results, and the analysis of ecosystem indicators. Then, a fleet-based synthesis is presented using indicators of both the ecological impact and the economic performances of the major fleets operating within each ecosystem. In particular, assessment diagrams show whether each fleet segment, on average, sustainably exploits the stocks. Although... |
| Tipo: Text |
Palavras-chave: Ecosystem approach; Economic performance; Fisheries management; Fleet; Indicator; Sustainable development. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00075/18601/16179.pdf |
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| Druon, Jean-noel; Fiorentino, Fabio; Murenu, Matteo; Knittweis, Leyla; Colloca, Francesco; Osio, Chato; Merigot, Bastien; Garofalo, Germana; Mannini, Alessandro; Jadaud, Angelique; Sbrana, Mario; Scarcella, Giuseppe; Tserpesi, George; Peristeraki, Panagiota; Carlucci, Roberto; Heikkonen, Jukka. |
| An ecological niche modelling (ENM) approach was developed to model the suitable habitat 36 for the 0-group European hake, Merluccius merluccius L., 1758, in the Mediterranean Sea. 37 The ENM was built combining knowledge on biological traits of hake recruits (e.g. growth, 38 settlement, mobility and feeding strategy) with patterns of selected ecological variables 39 (chlorophyll-a fronts and concentration, bottom depth, sea bottom current and temperature) 40 to highlight favourable nursery habitats. The results show that hake nurseries require stable 41 bottom temperature (11.8-15.0oC), low bottom currents (< 0.034 m.s-1) and a frequent 42 occurrence of productive fronts in low chlorophyll-a areas (0.1-0.9 mg.m-3) to support a 43 successful... |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00228/33947/32262.pdf |
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| Druon, Jean-noel; Fromentin, Jean-marc; Hanke, Alex R.; Arrizabalaga, Haritz; Damalas, Dimitrios; Ticina, Vjekoslav; Quilez-badia, Gemma; Ramirez, Karina; Arregui, Igor; Tserpes, George; Reglero, Patricia; Deflorio, Michele; Oray, Isik; Karakulak, F. Saadet; Megalbfonou, Persefoni; Ceyhan, Tevfik; Grubisic, Leon; Mackenzie, Brian R.; Lamkin, John; Afonso, Pedro; Addis, Piero. |
| An ecological niche modelling (ENM) approach was used to predict the potential feeding and spawning habitats of small (5-25kg, only feeding) and large (> 25kg) Atlantic bluefin tuna (ABFT), Thunnus thynnus, in the Mediterranean Sea, the North Atlantic and the Gulf of Mexico. The ENM was built bridging knowledge on ecological traits of ABFT (e.g. temperature tolerance, mobility, feeding and spawning strategy) with patterns of selected environmental variables (chlorophyll-a fronts and concentration, sea surface current and temperature, sea surface height anomaly) that were identified using an extensive set of precisely geo-located presence data. The results highlight a wider temperature tolerance for larger fish allowing them to feed in the northern –... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00308/41953/41803.pdf |
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| Druon, Jean-noel; Loyer, S; Gohin, Francis. |
| Different scales of hydrological and biological patterns of the Bay of Biscay are assessed using space-borne and airborne optical remote sensing data, field measurements and a 3-dimensional biophysical model. If field measurements provide accurate values on the vertical dimension, ocean colour data offer frequent observations of surface biological patterns at various scales of major importance for the validation of ecosystem modelling. Although the hydrobiological model of the continental margin reproduces the main seasonal variability of surface biomass, the optical remote sensing data have helped to identify low grid resolution, input inaccuracies and neglect of swell-induced erosion mechanism as model limitations in shallow waters. Airborne remote... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Models; Scaling; Remote sensing; Satellite observation; Phytoplankton. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-953.pdf |
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