The Ichthyoplankton State in the Sevastopol Bay Mouth (Black Sea)

Klimova, T. N.; Вдодович, І. В.; Ignatiev, Sergei M.; Seregin, S. A.; Kuzminova, Natalia S.; Pustovarova, Natalia I.; Попова, Елена

doi:10.17516/1997-1389-0009

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“…Such a basin is the unique and size significant semi-enclosed estuary-type water area stretched from east to west the Sevastopol Bay. The interannual variability of the ichthyoplankton abundance in different areas of the Sevastopol Bay and its determining factors had been studied very fragmentally [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. At the same time, significant data on the hydrodynamic and hydrochemical regimes of the bay have been collected [ 10 , 11 , 12 , 13 , 14 , 15 ].…”

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confidence: 99%

Intra-Decadal (2012–2021) Dynamics of Spatial Ichthyoplankton Distribution in Sevastopol Bay (Black Sea) Affected by Hydrometeorological Factors

Basova

Krasheninnikova

Parrino

2022

Animals

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High mortality of fish in the early stages of ontogenesis requires the detection of factors affecting it and is an extremely important problem. For this reason, we tried to consider the influence of some hydrometeorological factors on the intra-decadal dynamics and spatial distribution of ichthyoplankton abundance in Sevastopol Bay. To this end, we analyzed ichthyoplankton samples collected in 2012–2021 in Sevastopol Bay, and the four districts were identified. The ichthyoplankton distribution by areas was associated with the peculiarities of the pollution distribution. The maximum numbers in eggs (34.7 ± 7.5 ind. m−2) and larvae (10.0 ± 2.4 ind. m−2) were recorded in July–August. For the first time, a positive effect of temperature and repeatability of north and northeast winds on the ichthyoplankton number during the summer spawning in all identified areas of Sevastopol Bay using principal component analysis (PCA) was reported. In the southern region, positive influence of temperature and northerly winds on the ichthyoplankton abundance was confirmed by ANOVA (p = 0.02), and Pearson’s correlation analysis revealed significant correlations between these parameters on inter-annual scale (r > 0.5). In the eastern area, the discharge of rivers is an additional factor affecting the abundance of ichthyoplankton, while in the western and central areas, these factors were the wind characteristics caused by the orography peculiarities. The pollution spread in Sevastopol Bay is also largely due to the wind regime. The importance of comprehensive monitoring studies using intra-decadal data on ichthyoplankton is emphasized.

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