Makarov M. The ecological peculiarities of the Gastropoda (Mollusca) of the upper sublitoral zone of Crimea (The Black Sea)

32 species of Gastropoda in the upper sublitoral zone of the Black sea Crimean coast at the rocks, artifical reefs and macrophyts were observed. The taxon of gastropods is the most diversity at rocks and hard artifical reefs. The high abundance of Pyramidellidae (Odostomia eulomoides and Parthenina indistincta) was observed at hard surfaces, including mussel farm. These species had small abundance on soft bottom and macrophyts, which more investigated. It has been found that abundance of gastropods at Cystoseira and Zostera is strongly reduced, especially it relating to species-dominant: Rissoa splendida on Cystoseira and R. membranacea on Zostera, for last 35 - 50 years. The species Tricolia pullus is dominated on Cystoseira and Zostera in present. The high correlation between abundance Parthenina indistincta and Mytilus galloprovincialis was found. It is supposed that P. indistincta prefers M. galloprovincialis as host. On the basis of seasonal dynamics of abundance and size structure of population P. indistincta and Chrysallida obtusa we supposed that these species has spawn in autumn.