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| Martins, Rodrigo S.; Roberts, Michael J.; Chang, Nicolette; Verley, Philippe; Moloney, Coleen L.; Vidal, Erica A. G.. |
| Specific gravity is an important parameter in the dispersal of marine zooplankton, because the velocity of currents, and therefore the speed of transport, is usually greatest near the surface. For the South African chokka squid (Loligo reynaudii), recruitment is thought to be influenced by the successful transport of paralarvae from the spawning grounds to a food-rich feature known as the cold ridge some 100-200 km away. The role of paralarval specific gravity on such transport is investigated. Specific gravity ranged from 1.0373 to 1.0734 g cm(-3) during the yolk-utilization phase, implying that paralarvae are always negatively buoyant, regardless of yolk content. The data were incorporated into a coupled individual-based model (IBM)-Regional Ocean... |
| Tipo: Text |
Palavras-chave: Agulhas Bank; Chokka squid; Dispersal; Paralarvae; Specific gravity. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00013/12461/9316.pdf |
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| Blanke, Bruno; Penven, Pierrick; Roy, Claude; Chang, Nicolette; Kokoszka, Florian. |
| This study analyzes the oceanic pathway connecting the Agulhas Bank to the southern Benguela upwelling system by means of a quantitative Lagrangian interpretation of the velocity field calculated by a high-resolution numerical simulation of the ocean around the southwestern tip of Africa. The regional ocean model is forced with National Centers for Environmental Prediction surface winds over 1993-2006 and offers a relevant numerical platform for the investigation of the variability of the water transferred between both regions, both on seasonal and intraseasonal time scales. We show that the intensity of the connection fluctuates in response to seasonal wind variability in the west coast upwelling system, whereas intraseasonal anomalies are mostly related... |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7388.pdf |
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