ДОВГОСТРОКОВА ДИНАМІКА УГРУПОВАННЯ ЗООПЛАНКТОНУ ТИЛІГУЛЬСЬКОГО ЛИМАНУ

• Datum: 2025
• Hauptverfasser: Дядичко, В.Г., Кириллова, Ю.В.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Marine Ecological Journal 2025
• Schlagworte: Тилігульський лиман; зоопланктон; чисельність; біомаса; продукція
• Online Zugang: https://mej.od.ua/index.php/mej/article/view/720
• Назва журналу: Marine Ecological Journal

The Tylihul Estuary is connected to the sea through an artificial channel that has been staly functioning since 2017. In this article we investigated long-term changes of the biomass, abundance and production of zooplankton in the Tylihul Estuary during three periods of its functioning. Zooplankton samples were taken by the Institute of Marine Biology expeditions in 2007–2024. The taxonomic composition of zooplankton in the Tylihul Estuary changed significantly during the historical periods of the estuary functioning. A total of 42 zooplankton taxa were registed before the building of the channel. During the period of unstable connection the number of zooplankton taxa decreased from 37 (in 1980) to 6 (in 2010). However after 2010 it increased to 18 (in 2024). Zooplankton biomass was relatively low before the building of the channel. In the last two periods of the connection with the sea gelatinous organisms played an important role in shaping zooplankton biomass through their predation on mesozooplankton. The maximum biomass was observed in 1981–1993, when the estuary already had a periodic connection with the sea, but there were no mass jellyfish blooms. Thus the formation of the taxonomic structure and quantitative indicators of zooplankton in the estuary depend on the level of the Tylihul River runoff, water exchange with the adjacent marine aquatoria, salinity fluctuations due to evaporation, phytoplankton development, oxygen deficiency and the influence of gelatinous organisms. After 2017 during the period when the channel was stably open the biomass became larger than before the building of the channel. It was found that zooplankton production showed a gradual decline from 2021 to 2024. Therefore the current zooplankton of the Tylihul estuary consists of food organisms for fish of the marine and euryhaline complexes, the values of biomass and production of which are bigger than in the northwestern part of the Black Sea, but smaller than in the Khadzhibey and Dniester estuaries.