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Registration Number

0225U004265, (0125U003039) , R & D reports

Title

Analysis of changes in the helminth communities of teleost fishes as a method for monitoring of the state of marine ecosystems in West Antarctica

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Дослідження видового складу угруповань паразитів риб за зразками, що зібрані під час зимівлі 29-ї УАЕ.

Head

Kuzmina Tetiana А., Кандидат біологічних наук

Registration Date

27-11-2025

Organization

Schmalhausen Institute of Zoology of National Academy of Sciences of Ukraine

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The aim of this research work is to analyze temporal changes in the helminth communities of teleost fishes in the Argentine Islands region based on data collected from 2014 to 2025, to assess the current state and dynamics of separate groups of parasites. Assessment of the peculiarities of the parasite community formations of the Antarctic black rockcod Notothenia coriiceps as a model fish species will allow us to assess the dynamics of changes in the parasite infracommunities of teleost fish in the region over the past decades.

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The aim of this research work is to analyze temporal changes in the helminth communities of teleost fish in the Argentine Islands region based on data collected in 2014–2025, to assess the current state and dynamics of individual parasite groups. Assessment of the peculiarities of the parasite community formations of the Antarctic black rockcod Notothenia coriiceps as a model fish species will allow us to assess the dynamics of changes in the parasite infracommunities of teleost fish in the region over the past decades. Methods - identification of helminths of different taxonomic groups by morphologe and statistical analysis of the parameters of parasite populations using specialized programs. In five species of fish collected in 2024-2025, 20 helminth species from 5 taxonomic groups were found: 2 species of monogeneans, 5 species of trematodes, 3 species of cestodes, 4 species of nematodes and 6 species of acanthocephalans. 18 species were found in N. coriiceps. According to the prevalence (P), three groups of helminth species were separated: dominant (P=70–100%), background (P=20–70%) and rare (P < 20%) species. A significant decrease in the species richness of the helminth communities (from 28 to 18 species) and a trend of decreasing diversity Shannon and Simpson indices over the last 10 years were recorded. The use of a regression model revealed a statistically significant increase in N. coriiceps infection in 2020 and 2021 and a significant decrease in 2022–2024 relative to the base year 2014. The use of machine learning and statistical modeling clarified the indicator role of the trematodes Macvicaria pennelli, Genolinea bowersi, and acanthocephalans Corynosoma spp. to determine changes in the N. coriiceps helminth communities. A new species of acanthocephalan Corynosoma paraevae sp. n. and a new species of monogeneans Pseudobenedenia galindezensis sp. n from N. coriiceps were described.

Product Description

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Syrota Yaroslav Yu.
Lisitsyna Olha I.
Kuzmin Yurii I.

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2025-11-27