Robinson J. auteur aut IRD Guillotreau Patrice auteur aut IRD Jimenez-Toribio R. auteur aut IRD Lantz F. auteur aut IRD Nadzon L. auteur aut IRD Dorizo J. auteur aut IRD Gerry C. auteur aut IRD Marsac Francis auteur aut IRD text journalArticle eng text/pdf born digital access Many small island states have developed economies that are strongly dependent on tuna fisheries. Consequently, they are vulnerable to the socio-economic effects of climate change and variability, processes that are known to impact tuna fisheries distribution and productivity. The aim of this study was to assess the impacts of climate oscillations on the tuna-dependent economy of Seychelles. Using a multiplier approach, the direct, indirect and induced economic effects of the tuna industry expenditure benefiting the Seychelles' economy declined in 1998 by 58, 26 and 35%, respectively (mean decline: 42%), a year of strong climate oscillation in the western Indian Ocean. Multivariate patterns in tuna purse-seine vessel expenditures in port were substantially modified by strong climate oscillations, particularly in 1998. A cointegration time-series model predicted that a 40% decline in tuna landings and transhipment in Port Victoria, a value commensurate with that observed in 1998, would result in a 34% loss for the local economy solely through reductions in cargo handling expenditures. Of several indices tested, the Indian Oscillation Index was best at predicting the probability of switching between low and high regimes of landings and transhipment, which translate into impacts for the economy. It is hypothesised that a late 2006/early 2007 climate oscillation was compounded by prior overfishing to produce a stronger impact on the fishery and economy of Seychelles. The effects of fishing and climate variability on tuna fisheries are complex and pose significant challenges for fisheries management and the economic development of countries in the Indian Ocean. specialized Climate variability ENSO Tuna fisheries Seychelles economy 040 032 43 3 149-162 2010 0936-577X https://www.documentation.ird.fr/hor/fdi:010052967 10.3354/cr00890 0936-577X [F B010052967] https://www.documentation.ird.fr/hor/fdi:010052967 https://www.documentation.ird.fr/intranet/publi/2010/12/010052967.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-01-10 2017-08-23 fdi:010052967 fre