ИСТИНА

Specific knowledge of individual biologies will greatly improve our understanding of the forces shaping ecosystem structure. Biological properties of organisms such as life cycles peculiarities determine seasonal processes in the sea. There is a huge diversity of marine invertebrate species. Nevertheless our knowledge of invertebrates' life cycles is not comprehensive. Meroplankton is useful to estimate the biodiversity and reproduction time of invertebrates inhabited bottom biotopes. But planktonic larvae often were missed during monitoring studies because of identification difficulties. New results can be achieved using molecular tools. Planktonic larvae were collected using plankton net near White Sea Biological Station (WSBS MSU) in 2016-2017. The larvae were identified in molecular laboratory of WSBS. We used mitochondrial (COI, 16S) DNA fragments to identify our specimens. In total we obtained 22 sequences of different species including 10 species of polychaetes (Neoamphitrite figulus, Bipalponephtys neotena, Eulalia viridis, Glycera capitata, Laonice cirrata, Lepidonotus squamatus, Lagis (Pectinaria) koreni, Phyllodoce maculata, Polydora sp., Scoloplos armiger), 10 species of molluscs (Limecola (Macoma) balthica, Modiolus modiolus, Mya arenaria, Alderia modesta, Ancula gibbosa, Eubranchus rupium, Flabellina (Coryphella) verrucosa, Paracoryphella islandica, Palio dubia, Lacuna vincta), bryozoan Electra pilosa and echinoderm Asterias rubens. Our results increase the knowledge of invertebrates' life cycles in the White sea. Also the results may be useful for estimation of invertebrates' biodiversity in the White sea.