DIURNAL DYNAMICS OF THE SPATIAL DISTRIBUTION OF PLATYNEREIS DUMERILII (POLYCHAETA) IN THE FOULING COMMUNITY OF THE ODESSA BAY, BLACK SEA
Journal Title: Naukovyi visnyk Chernivetskoho universytetu. Biolohiia (Biolohichni systemy) - Year 2017, Vol 9, Issue 1
Abstract
The daily dynamics of the quantitative parameters of Platynereis dumerilii (Audoin et Milne Edwards, 1834) in different phases of the Lunar cycle in the near-surface and near-bottom horizons of the Black Sea fouling community of Odessa Bay is shown. It is noted that in the spatial distribution of polychaetes a certain cyclicity is observed, caused by a regular change in the degree of illumination of the water column in different phases of the Lunar cycle. It is shown that in the last quarter most P. dumerilii individuals are in the lower horizon of the community at a depth of 2.0 m. During the daytime, the abundance of polychaetes in this horizon was 8 times higher than within the upper horizon of the community at a depth of 0.5 m, where it was about 800 ind.·м-2. At night, this difference was three times less. In this phase of the Lunar cycle, the daily variability of worms biomass as a whole was coincided with the dynamics of their abundance. At the same time, during the daytime, young individuals of P. dumerilii predominated within the depths studied. At the sunset and at the midnight in the population of polychaetes the proportion of adults increased sharply. It was shown that in the new moon phase the largest quantitative parameters of worms were recorded at a depth of 0.5 m. At the midnight, when the illumination of the water column was minimal, the abundance of worms in the near-surface horizon was 3.6 times higher than in the near-bottom. At that time, large mature individuals of polychaetes concentrated in the near-surface horizon of the community in connection with the beginning of the reproduction process. It is shown that in the first quarter phase most of the worms fell into the near-bottom horizon of the community. At the same time, the dynamics of worms’ biomass did not coincide with the variability of their abundance. At the sunrise at a depth of 0.5 m, the biomass of worms was 72.5 g·м-2, which is 1.8 times higher than on the near-bottom horizon. The increase in the biomass of P. dumerilii with a decrease in their abundance was due to larger adult individuals. It was noted that in the full moon phase the quantitative parameters of P. dumerilii decreased fourfold compared to the previous period.
Authors and Affiliations
А. Ю. ВАРИГИН
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