On the practice of heterogeneity analysis of macrobenthic soft bottom communities (Kandalaksha bay, White Sea)
In 2008 the structure of macrobenthic communities was described at three sites of the White Sea Keret’ archipelago littoral zone. According to the principle of dominance, it is shown that studied sites should be acknowledged as the typical habitats in the White Sea littoral zone for different biocenoses: Macoma balthica + Arenicola marina, Mytilus edulis + Mya arenaria and Zostera marina. The main goal of this work is to estimate a uniform number of replicates for all stations sufficient for achieving the same result of biocenosis differentiation, but using various characteristics for classifi cation of macrobenthos descriptions at stations. The repeated procedures of macrobenthos descriptions comparison based on different numbers of samples (1–10) were performed. It was shown that we can talk about the difference in required number of replicates for different approaches for description of macrobenthic communities. When community descriptions are based only on dominant taxa 3 replicates is quite sufficient. When using classification procedure if the station characteristics represent data on species composition we need 5 and more samples, species biomass — 4 and more samples. The most adequate characteristic of macrobenthos for the classification are standardized biomass values of taxa. Refs 34. Figs 3. Tables 2.
White Sea, littoral, macrobenthos, community, hydrobiological research methods
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