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Migratory history of the Russian sturgeon Acipenser guldenstadti in the Caspian Sea, as revealed by pectoral fin spine Sr:Ca ratios |
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| Authors: | T Arai A Levin A Boltunov N Miyazaki |
| Institution: | Otsuchi Marine Research Center, Ocean Research Institute, The University of Tokyo, 2-106-1, Akahama, Otsuchi, Iwate 028-1102, Japan, Caspian Scientific Research Institute of Fisheries, 414056 Astrakhan, Russia, All-Russian Research Institute for Nature Protection, Znamenskoe-Sadki 113628 Moscow, Russia, |
| Abstract: | Ontogenic patterns of change in pectoral fin spine Sr:Ca ratios were examined in the Russian sturgeon Acipenser guldenstadti from the Caspian Sea. Pectoral fin spine Sr:Ca ratios of the sturgeon fluctuated strongly along the life history transect in accordance with the migration pattern from freshwater to sea (brackish) water habitats, i.e. all specimens exhibited a typical anadromous pattern in the ratio. Several specimens showed two transition points in pectoral fin spine Sr:Ca ratios from low ratios to high, indicating that those specimens had a flexible migration strategy in the ambient water, and could migrate downstream to the Caspian Sea multiple times after spawning. |
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