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| Logan, J.m.; Pethybridge, Heidi; Lorrain, Anne; Somes, C.; Allain, Valerie; Bodin, Nathalie; Choy, C.a.; Duffy, L.; Goñi, N.; Graham, B.; Langlais, C.; Ménard, F.; Olson, R.; Young, J.. |
| A global dataset of carbon stable isotope (δ13C) values from yellowfin, bigeye, and albacore tuna muscle tissue (n = 4275) was used to develop a novel tool to infer broad-scale movement and residency patterns of these highly mobile marine predators. This tool was coupled with environmental models and lipid content (C:N ratio) of tuna muscle tissues to examine ocean warming impacts on tuna ecology and bioenergetic condition across Longhurst provinces. Over a 16-year study period (2000–2015), latitudinal gradients in tuna δ13C values were consistent, with values decreasing with increasing latitude. Tuna δ13C values, reflecting modelled global phytoplankton δ13C landscapes (“isoscapes”), were largely related to spatial changes in oxygen concentrations at... |
| Tipo: Text |
Palavras-chave: Albacore tuna; Bigeye tuna; Yellowfin tuna; Carbon isotope analysis; Movement indicators; Global ocean; Fisheries management. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00617/72943/71964.pdf |
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| Guyader, Olivier. |
| With a thin economic component, most bio-economic models of fisheries fail to assess the effects of the regulation systems on firms. In order to analyse the short term consequences of different management schemes, a simulation model is applied to the French driftnet albacore fleet: licence allocation with driftnet regulation, individual quotas, and individual transferable quotas without any input control. Vessel technology is estimated by using the data collected, and groups of vessels are distinguished according to criteria of performance. We present the adjustment within firms and between groups under different scenarios (limited entry with and without driftnet regulation, individual quotas and individual transferable quotas allocation), and we compare... |
| Tipo: Text |
Palavras-chave: Albacore tuna; Dolphin; Driftnet; Fisheries; ITQ; Licence; Quasi-rent; Quota price; Quotas; Regulation; Simulation. |
| Ano: 2002 |
URL: https://archimer.ifremer.fr/doc/00244/35523/34036.pdf |
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