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. (2021). Fine-scale structures as spots of increased fish concentration in the open ocean (Vol. 11).
Abstract: Oceanic frontal zones have been shown to deeply influence the distribution of primary producers and, at the other extreme of the trophic web, top predators. However, the relationship between these structures and intermediate trophic levels is much more obscure. In this paper we address this knowledge gap by comparing acoustic measurements of mesopelagic fish concentrations to satellite-derived fine-scale Lagrangian Coherent Structures in the Indian sector of the Southern Ocean. First, we demonstrate that higher fish concentrations occur more frequently in correspondence with strong Lagrangian Coherent Structures. Secondly, we illustrate that, while increased fish densities are more likely to be observed over these structures, the presence of a fine-scale feature does not imply a concomitant fish accumulation, as other factors affect fish distribution. Thirdly, we show that, when only chlorophyll-rich waters are considered, front intensity modulates significantly more the local fish concentration. Finally, we discuss a model representing fish movement along Lagrangian features, specifically built for mid-trophic levels. Its results, obtained with realistic parameters, are qualitatively consistent with the observations and the spatio-temporal scales analysed. Overall, these findings may help to integrate intermediate trophic levels in trophic models, which can ultimately support management and conservation policies.
Keywords: Fisheries Marine biology Physical oceanography
Programme: 109
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Alberto Mancini, Giuliano Nucciarelli, Mauro Dolci, Gilles Durand. (2009).
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Albessard E. & Mayzaud P. (2003). Influence of the tropho-climatic environment and reproduction on the lipid composition of the euphausiid Meganyctiphanes norvegica from the Ligurian Sea, the Clyde Sea and the Kattegat. Mar. Ecol. Prog. Ser., 253, 217–232.
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Albessard E., Mayzaud P. & Cuzin Roudy J. (2001). Variation of lipid classes among organs of the Northern krill Meganyctiphanes norvegica with respect to reproduction. Comp. Biochem. Physiol., Part A Mol. Integr. Physiol., 129, 373–390.
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Alekhina I., D. Marie, J-R. Petit, V. Lukin, V. Zubkov, S. Bulat. (2007). Hydrocarbon rich extreme econiche established in the deepest ice borehole at Vostok, East Antarctica..
Abstract: The 7th European Workshop on Astrobiology (EANA07), Turku, Finland, October 22-24
Programme: 355
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Alekhina I.A., D. Marie, J-R. Petit, V. Lukin, V.M. Zubkov and S.A. Bulat. (2006). Bacteria in kerosene-based drilling fluid from the deepest ice borehole at Vostok, East Antarctica..
Abstract: Int. Conference on Extremophiles, Brest, France, 17-21 September abstract L24
Programme: 355
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Alekhina I.A., J.R. Petit, V.V. Lukin, N.I. Vasiliev, and S.A. Bulat. (2005). Estimate for bacterial contents of 5G-1 borehole drilling fluid, Vostok station, Antarctica. Mater. Glyatsiol. Issled. Data Glaciol. Stud., 98, 109–117.
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Alekhina, I., D. Marie, J.R. Petit , V.V. Lukin , V.N. Zubkov, and S. Bulat. (2007). Molecular analysis of bacterial diversity in kerosene-based drilling fluid from the deep ice borehole at Vostok, East Antarctica FEMS Microbiol. Ecol. FEMS Microbiol. Ecol., 59, 289–299.
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Alekhina, I.,D Marie, J.R. Petit, V.Lukin, V.Zubkov and S. Bulat. (2006). Bacterial contents of kerosene-based drilling fluid from the deepest ice borehole at Vostok, East Antarctica.
Abstract: International Conference on Alpine and Polar microbiology, Innsbruck, 27-30 March
Programme: 355
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Alemany O, Chappellaz J, Triest J, Calzas M, Cattani O, Chemin JF, Desbois Q, Desbois T, Duphil R, Falourd S, Grilli R, Guillerme C, Kerstel E, Laurent B, Lefebvre E, Marrocco N, Pascual O, Piard L, Possenti P, Romanini D, Thiebaut V, Yamani R, . (2014). The SUBGLACIOR drilling probe: concept and design
. Annals of Glaciology, 55(68), 233–242.
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