| Autor: |
Orlova, Marina, Muirhead, Jim, Antonov, Pavel, Shcherbina, Gregory, Starobogatov, Yaroslav, Biochino, G., Therriault, Thomas, MacIsaac, Hugh |
| Zdroj: |
Aquatic Ecology; December 2004, Vol. 38 Issue: 4 p561-573, 13p |
| Abstrakt: |
In 1992, we discovered populations of the nonindigenous quagga mussel Dreissena rostriformis bugensis(Andrusov 1897) in the middle reaches of the Volga River. The same species was found in samples collected between 1994 and 1997 in the Volga delta and in shallow areas of the Northern Caspian Sea. D. r. bugensisalways co-occurred with its more widespread congener, the zebra mussel D. polymorpha(Pallas 1771). The quagga mussel’s contribution to total Dreissenaabundance increased over time in the middle Volga reservoirs and Volga River delta. D. r. bugensiswas common in the Volga portion of Rybinsk Reservoir during 1997 and, by 2000, it was in Uglich, Rybinsk and Gorky Reservoirs on the Upper Volga River. D. r. bugensiswas neither found in Ivankov Reservoir, nor in terminal sections of the Volga-Baltic corridor including the eastern Gulf of Finland. Presently, all but the northern-most regions of the Volga River have been colonized by D. r. bugensis. We hypothesize that its introduction into the Volga River and Caspian basin occurred no later than the late 1980s via commercial shipping that utilized the Volga-Don waterway to navigate between the source Black-Azov Sea region and recipient areas on the Volga River. Larval drift likely contributed to establishment of populations at downstream sites, while human-mediated vectors may be responsible for introductions to upstream locations on the Volga River. We anticipate continued northward dispersal in conjunction with shipping activities. |
| Databáze: |
Supplemental Index |
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