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| Titel |
Why is Trichodesmium abundant in the Kuroshio? |
| VerfasserIn |
T. Shiozaki, S. Takeda, S. Itoh, T. Kodama, X. Liu, F. Hashihama, K. Furuya |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 23 ; Nr. 12, no. 23 (2015-12-04), S.6931-6943 |
| Datensatznummer |
250118191
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| Publikation (Nr.) |
 copernicus.org/bg-12-6931-2015.pdf |
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| Zusammenfassung |
| The genus Trichodesmium is recognized as an abundant and major diazotroph in the
Kuroshio, but the reason for this remains unclear. The present study
investigated the abundance of Trichodesmium spp. and nitrogen fixation together with
concentrations of dissolved iron and phosphate in the Kuroshio and its
marginal seas. We performed the observations near the Miyako Islands, which
form part of the Ryukyu Islands, situated along the Kuroshio, since our
satellite analysis suggested that material transport could occur from the
islands to the Kuroshio. Trichodesmium spp. bloomed (> 20 000 filaments L−1)
near the Miyako Islands, abundance was high in the Kuroshio and
the Kuroshio bifurcation region of the East China Sea, but was low in the
Philippine Sea. The abundance of Trichodesmium spp. was significantly correlated with the
total nitrogen fixation activity. The surface concentrations of dissolved
iron (0.19–0.89 nM) and phosphate (< 3–36 nM) were similar for all
of the study areas, indicating that the nutrient distribution could not
explain the spatial differences in Trichodesmium spp. abundance and nitrogen fixation.
Numerical particle-tracking experiments simulated the transportation of
water around the Ryukyu Islands to the Kuroshio. Our results indicate that
Trichodesmium growing around the Ryukyu Islands could be advected into the Kuroshio. |
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