BIOLOGIYA MORYA, 2022, Vol. 48, No. 3, pp. 190-200 |
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Long-Term Dynamic of the Structure of the Community of Phyllospadix iwatensis Makino, 1931 (Alismatales: Zosteraceae) in the Intertidal Zone of the Krabovaya Bay (Shikotan Island, Kurile Islands) A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia E-mail: The long-term variations in the structure of the Phyllospadix iwatensis community in the intertidal zone of Krabovaya Bay (Shikotan Island, Kuril Islands) under the influence of natural and anthropogenic factors were described basing on the materials of the research expeditions of 1987, 1997, and 2013 with the addition of literature data for 1949, 1955, and 1963. Throughout the entire period of study, the following associated macrobenthos species were always recorded in the Ph. iwatensis community: the sponge Halichondria panicea, the sipunculid Phascolosoma agassizii, the isopod Idotea ochotensis, the hermit crab Pagurus middendorffii, and gastropods Buccinum percrassum, Nucella heyseana, and Littorina sitkana. It was shown that the organic pollution of the bay induced an increase in the species richness and population density of associated species with a simultaneous reduction in the share of dominant species biomass. After an earthquake and the tectonic subsidence of the island, the species richness of the community was found reduced, while the biomass of the dominant species increased. The total biomass of the community increased throughout the study period. The degree of change in the ecological state of the Phyllospadix community in the intertidal zone of Krabovaya Bay was estimated by comparison of cumulative abundance/biomass curves. Key words: Phyllospadix iwatensis community, long-term variations, community structure, intertidal zone, Krabovaya Bay, Shikotan Island, Kurile Islands, biomass and abundance dominance curves (the ABC-method). |
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