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STAMM : un modèle individu-centré de la dispersion active des tortues marines juvéniles. Applications aux cas des tortues luths du Pacifique Ouest et de l’Atlantique Nord-Ouest et aux tortues caouannes de l’ouest de l’océan Indien. ArchiMer
Lalire, Maxime.
Sea turtles are increasingly threatened by the direct and indirect effects of human activities. Their life cycle is complex, shared between various, and often very distant, habitats. Their conservation therefore requires identifying the habitats occupied at each stage of life and the migration routes between these different habitats. While the spatial ecology of adult turtles is relatively well known, particularly through satellite monitoring, the situation is not the same for juveniles which pelagic development phase remains largely unobserved. In that context, numerical simulation constitutes an appropriate tool to explore the dispersal of juvenile sea turtles from their natal beaches. Until now, simulations were mostly performed under the assumption...
Tipo: Text Palavras-chave: Courants marins; Dispersion; Ecologie spatiale; Modélisation lagrangienne; Modèles de mouvement; Modèles d'habitat; Simulations numériques; Tortues marines juvéniles; Tortue luth; Tortue caouanne; Oceanic currents; Dispersal; Spatial ecology; Lagrangian modelling; Movement modelling; Habitat modelling; Numerical simulations; Juvenile sea turtles; Leatherback turtle; Loggerhead turtle..
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00497/60912/64263.pdf
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Modélisation statistique de la distribution spatiale des espèces Zostera marina et Zostera noltei à l'échelle de la façade Manche-Atlantique ArchiMer
Mouillard, Romain.
The MarHa Life project coordinated by the Office Français de la Biodiversité aims at restoring and/or maintaining the good ecological status of natural marine habitats in France. As part of this project, my mission was to statistically model the spatial distribution of zostera seagrass beds (Zostera marina and Zostera noltei) along the French Atlantic and English Channel coastline. A first objective was to assess results sensitivity to the modelling approach and in particular to the type of model used (GLM, RF, BRT) so as to characterize the performance of the method and to identify the best-suited models. Then, using the selected models, a second objective was to predict the potential spatial distribution of these two species along the French...
Tipo: Text Palavras-chave: Zostera marina; Zostera noltei; Modèle d’habitat; Habitat potentiel; Niche environnementale; Zostera marina; Zostera noltei; Habitat modelling; Potential habitat; Environmental niche.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00667/77870/80015.pdf
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Identification and characterisation of winter spawning ground in the English Channel and Southern North Sea ArchiMer
Lelievre, Stephanie.
A better knowledge and monitoring of principal commercial fish spawning grounds have become necessary in the North Sea. The efficiency of CUFES was proved by sampling pelagic fish eggs in winter in Eastern Channel and Southern North Sea. Fish egg taxonomic identification based on visual criteria cannot always be carried out effectively. In particular, cod (Gadus morhua), and whiting (Merlangius merlangus) or flounder (Platichthys flesus) and dab (Limanda limanda) have the same range of egg diameter and similar morphologies. Alternative identification methods using molecular techniques were developed to improve the accuracy of egg taxonomic identification. First, PCR-RFLP method, then, in order to accelerate egg identification, the use of a new laboratory...
Tipo: Text Palavras-chave: Oeufs de poissons; CUFES; VET; PCR-RFLP; Cyt b; 16S; ZooScan; Analyse d’images; Analyses géostatistiques; Interpolation; Modélisation d’habitat; GLM; RQ; Fish eggs; CUFES; VET; Image analysis; ZooScan; PCR-RFLP; Geostatistical analyses; Interpolated map; Habitat modelling; GLM; RQ.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00043/15398/12757.pdf
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Testing the transferability of track-based habitat models for sound marine spatial planning ArchiMer
Peron, Clara; Authier, Matthieu; Gremillet, David.
Aim Species distribution models (SDMs) are statistical tools aiming at mapping and predicting species distributions across landscapes. Data acquisition being limited in space and time, SDM are commonly used to predict species distribution in unsampled areas or years, with the expectation that modelled habitat-species relationships will hold across spatial or temporal contexts (i.e., model transferability). This key aspect of habitat modelling has major implications for spatial management, yet it has received limited attention, especially in the dynamic marine realm. Our aims were to test geographical and temporal habitat model transferability and to make recommendations for future population-scale habitat modelling. Location Methods Two contrasted regions...
Tipo: Text Palavras-chave: Biologging; Central-place foragers; Extrapolation; Habitat modelling; Seabirds; Transferability.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00470/58174/75133.pdf
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Predicting bycatch hotspots in tropical tuna purse seine fisheries at the basin scale ArchiMer
Mannocci, Laura; Forget, Fabien; Travassos Tolotti, Mariana; Bach, Pascal; Bez, Nicolas; Demarcq, Herve; Kaplan, David; Sabarros, Philippe; Simier, Monique; Capello, Manuela; Dagorn, Laurent.
Fisheries observer programs represent the most reliable way to collect data on fisheries bycatch. However, their limited coverage leads to important data gaps that preclude bycatch mitigation at the basin scale. Habitat models developed from available fisheries observer programs offer a potential solution to fill these data gaps. We focus on tropical tuna purse seine fisheries (TTPSF) that span across the tropics and extensively rely on floating objects (FOBs) for catching tuna schools, leading to the bycatch of other species associated with these objects. Bycatch under floating objects is dominated by five species, including the vulnerable silky shark Carcharhinus falciformis and four bony fishes (oceanic triggerfish Canthidermis maculata, rainbow runner...
Tipo: Text Palavras-chave: Bycatch; Habitat modelling; Hotspots; Fisheries observer programs; Geographical extrapolation; Tropical oceans.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00662/77385/78986.pdf
Registros recuperados: 5
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