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| Titel |
Sea level height, sea surface temperature, and tuna yields in the Panama bight during El Niño |
| VerfasserIn |
M. J. Pedraza, J. A. Díaz Ochoa |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 1st Alexander von Humboldt International Conference ; Nr. 6 (2006-01-30), S.155-159 |
| Datensatznummer |
250003252
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| Publikation (Nr.) |
 copernicus.org/adgeo-6-155-2006.pdf |
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| Zusammenfassung |
| Between 1988 and 1998, annual tuna landings at Buenaventura (Colombian
Pacific) are correlated with the sea surface temperature in the central
Equatorial Pacific (r=0.78, p<0.05) and the sea level height at
Buenaventura (r=0.76, p<0.05) and Balboa (Panama) (r=0.79, p<0.05).
Seasonal oceanic upwelling is forced by the Panama wind jet, which
may favour oceanic fisheries such as tuna. Here we first apply a bivariate
correlation method (Pyper and Peterman, 1994) and then a multivariate
approach (principal components analysis or PCA) to investigate the
relationships of these environmental variables with landings. With the first
method, we find that landing is best correlated with the sea surface
temperature in the Niño 3 region, whereas the other relationships are
less clear. In contrast, with PCA we find that PC1 explains 90.6% of the
total variance and suggests that sea surface temperature plays a major role
in determining tuna availability in the area (especially during El Niño
events). Since PC2 is mainly correlated with sea level height at Balboa but
only represents 6.8% of the total variance, we suggest that oceanic
upwelling effects on tuna landings at Buenaventura are not significant at
interannual scales. |
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