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LEGENDS
Figure 1. Map of the western Mediterranean and adjacent North Atlantic. Arrows
indicate spawning migration routes of bluefin tuna and grey areas the known spawning
sites in the Mediterranean Sea (from Mather et al., 1995). Numbers denote the locations
of the traps: (1) Medo das Casas, (2) Sidi Daoud, (3-5) Favignana, Formica and Bonagia
(6) Saline, (7-9) Porto Paglia, Porto Scuso and Isola Piana. T denotes the locations of
the stations of instrumental temperature (from the left to the right): Cadix, Dar-El-
Beida, Cagliari and Palermo.
Figure 2. Plots of the 9 BFT time series (thin line: log data; bold line: running median
of order 3). N is catch (BFT/year)
Figure 3. Plots of the 10 environmental time series (thin line: log data; bold line:
running median of order 3).
Figure 4. Left panel: smoothed periodograms of the 9 BFT time series, right panel:
smoothed periodograms of the 10 environmental time series. BFT (trap catches), LOD,
and temperature time series were dominated by low frequencies, whereas the NAO time
series displayed both high and low frequencies.
Figure 5. Box-plots of the p-values of the linear regressions between the BFT time
series and: (a) the NAO index from Hurrell (N = 6 regressions), Jones (N = 9) and
Appenzeller (N = 9), (b) the LOD index (N = 8), (c) the Northern Hemisphere
temperatures from Jones (N = 6) and D’Arrigo (N = 9), (d) instrumental temperatures
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