Abstract

The seasonal dynamics of the numbers of larvae of common fouling organisms—the barnacle Balanus improvisus and the bivalves Mytilaster lineatus and Mytilus galloprovincialis in Balaklava Bay (Black Sea) —were investigated during 2000 and 2001 within the framework of an ecological research project. Under the conditions of an increased anthropogenic load, seasonal fluctuations of the numbers and the distribution of larvae depend on rhythms of the breeding cycles of fouling invertebrates and on the hydrodynamic features of the region (water setup). The differences in the optimum temperatures, hatching intensity, and time of occurrence of larvae in the plankton, as well as the irregular distribution of larvae, allow the three major fouling organisms to reduce interspecific competition for food and the substrate.

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