Hydrobiological surveys in lagoonal Izmenchivoye Lake (Sakhalin Island) were carried out in 2004, 2005, and 2007 in order to examine the main changes in the composition and structure of macrozoobenthos after the cessation of its communication with the sea. Changes in the hydrological regime of the lake led to a significant reduction in the species list, a decline in the diversity of benthic communities, as well as a twofold increase in the population density of constituent species. The characteristic communities of the seawater cold spreading layer and tidal littoral communities disappeared after the water exchange with the sea ended. The latter communities were replaced with a lacustrine exposed littoral community dominated by amphipods and isopods. The previously shallow-water community dominated by the bivalve Musculista senhousia became the main benthic community. The number of warm-water elements increased markedly. Water temperature proved to be the main factor affecting the composition and structure of benthos of Sakhalin lagoons at the initial stages of evolution of macrobenthos.
Russian Journal of Marine Biology – Springer Journals
Published: Sep 4, 2009
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