Epibiotic Macroalgae on Scallops and Oysters in Shallow Waters of Southern Primorye
2021
Levenets, I. R. | Lebedev, E. B. | Baranov, A. Yu
This paper examines the composition of epibiotic algae of four bivalve species, namely, Swift’s scallop, Farrer’s scallop, the Yesso scallop, and the Pacific oyster in the coastal regions of Southern Primorye. Epibiotic flora of the Yesso scallop from 14 areas is composed of 83 species (45 red, 16 brown, and 22 green). The flora of Farrer’s scallop from two areas includes 16 species (13 red, 1 brown, and 2 green). Only nine species of red algae are found on valves of Swift’s scallop from one area. Epibiotic flora of the Pacific oyster from three areas comprises 32 species (20 red, 10 brown, and 2 green). Rhodophyta species are dominant based on the number of species in epibioses of all mollusks in most of the study areas. The high species richness of epibiotic flora of the Yesso scallop is recorded from the mixed colonies of Pos’et Bay (44 species) and the bottom culture of Stark Strait (37). Providing favorable conditions, that is, active hydrodynamics, low water pollution level, and an insignificant deposition of mud, 21 to 25 species of algae occur in natural aggregations of the Yesso scallop. Under unfavorable conditions, the number of species does not exceed 6–12 species. Wild colonies of the two other scallop species are characterized by an even greater Rodophyta dominance based on the number of species. Chlorophyta species (Codium spp.) dominates by biomass in natural epibioses of the Yesso scallop and Farrer’s scallop in clean areas of Peter the Great Bay. Epibiotic flora of the Pacific oyster features the dominance of Phaeophyceae based on the number of species and biomass in the cultivated and biomass in natural colonies.
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