Biologiya Morya
ISSN (print): 0134-3475
Media registration certificate: ПИ № ФС 77 - 74515 от 24.12.2018
Founders: Russian Academy of Sciences (RAS); Far East Branch of RAS
Editor-in-chief: Dolmatov Igor Yurjevich
Number of issues per year: 6
Indexation: Higher Attestation Commission list, RISC, RISC core, RSCI, Crossref, White list (3rd level).
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Vol 51, No 4 (2025)
- Year: 2025
- Published: 15.08.2025
- Articles: 5
- URL: https://journals.rcsi.science/0134-3475/issue/view/21154
ОРИГИНАЛЬНЫЕ СТАТЬИ
Syntaxonomy of annual and summer supralittoral and pseudolittoral macroalgal communities of the North Caucasian coast, Black Sea
Abstract
Annual and seasonal (summer) supra- and pseudolittoral macroalgal communities of the northeastern Black Sea coast have been described for the first time, using the floristic classification method. A total of three associations, one community, one alliance, one order, and one class have been identified. The associations, community, alliance, and order have been described for the first time. Diagnostic species are provided for the identified syntaxa. Based on the dominant classification method, the identified phytocoenoses are compared with those previously described from the Black Sea and with similar communities from the Mediterranean Sea and other European seas. It is shown that the annual and summer vegetation on hard substrates in the supra- and pseudolittoral zones of the northeastern Black Sea mainly consists of simple species-poor communities, which are predominantly comprised of cosmopolitan and subcosmopolitan species, along with a few species of the Indo-Atlantic, Atlantic-Pacific, and Mediterranean origin. However, the communities’ diversity is significantly poorer in the northeastern Black Sea supra- and pseudolittoral than that in the Mediterranean Sea, mainly due to lack of communities of calcifying red algae. An indirect ordination analysis revealed the ecological isolation of the described phytocenoses and the main factors influencing the floristic composition of communities: depth, eutrophication, and/or hydrodynamic intensity.
Biologiya Morya. 2025;51(4):185-196
185-196
Algal community succession in typhoon-damaged phytocenosis of Stephanocystis crassipes in Peter the Great Bay, Sea of Japan
Abstract
The algal cover on the typhoon-devastated substrate in Sobol Bay recovered according to the successional pattern, which usually proceeds in three phases: the bacterial-diatom phase, the phase of alternating communities of opportunistic species, and the structured late successional community. We observed the first two phases. A few days after the storm, a diatom cover began to develop, with projective cover reaching 100% after 16 days. Naviculoid diatoms and species of the genus Licmophora dominated during this phase. One month after the devastation, the first macroalgal germlings appeared, indicating the beginning of the second phase, during which the change of algal communities was determined by seasonal reproduction and vegetation patterns. During the first three years, the substrate was dominated by seasonal and annual algae. In the fourth year, late-successional species entered the dominant category. Compared to other regions of the Northwest Pacific, the development of the algal cover in Sobol Bay was characterized by a longer duration of the second phase (not less than four years) and a greater number of changing seasonal communities in it (not less than five).
Biologiya Morya. 2025;51(4):197-208
197-208
Reproductive characteristics of the subtidal hermit crab Pagurus ochotensis Brandt, 1851 (Decapoda: Paguridae) from Peter the Great Bay, Sea of Japan
Abstract
The reproductive characteristics of the subtidal hermit crab Pagurus ochotensis Brandt, 1851 from Peter the Great Bay (Sea of Japan) were studied based on material collected in 2014–2015 and 2023–2024. Within the depth range of 2 to 11 m, this hermit crab was encountered year-round, except in July and August, when it was either absent at these depths or represented by single individuals. The bulk of the P. ochotensis population (over 90%) consisted of males with a shield length (SL) of 8–18 mm and females with a SL of 7–13 mm. A peak in abundance was observed in April–May, primarily due to ovigerous females. Spawning in P. ochotensis is asynchronous: ovigerous females were recorded from January to June and, in smaller numbers, in August. The presence of females that had recently laid eggs in August suggests a probable repeat spawning involving older size classes. The incubation period of the first generation eggs lasted from two to five months and ended in late May to early June. The development duration of the second generation eggs was likely about one month. The minimum SL (5.7–5.8 mm) of ovigerous females of P. ochotensis corresponded to the second year of life. Individual fecundity in females with SL from 5.7 to 12.8 mm ranged from 2127 to 14 853 (with an average of 7984 ± 3320) eggs.
Biologiya Morya. 2025;51(4):209-219
209-219
Population characteristics of the copepod Calanus euxinus Hulsemann, 1991 off the Crimea coast (Black Sea)
Abstract
Abundance, biomass, and size-age structure of the population, as well as the reserve lipid content of copepodites V, males, and females of the cold-water copepod Calanus euxinus Hulsemann, 1991, were determined based on the analysis of the field material collected in October 2022 in the deep-sea and shelf areas of the Black Sea off the Crimean Peninsula. It was found that in October 2022, the average abundance and biomass values of C. euxinus (8600 ± 1200 ind./m2 and 6.5 ± 0.8 g/m2, respectively) in the open sea areas increased twice compared to 2019. In the shelf zone, the average abundance and biomass values of C. euxinus differed insignificantly between the fall seasons of 2022 and 2019. The increase in the proportion of older copepodites in the deep-sea areas in 2022 indicated an increase in the species’ generative potential, while the high relative abundance of the early age stages of C. euxinus in the coastal zone indicated active population reproduction. The accumulation of large amounts of the reserved lipids in oil sacs of the older stages of C. euxinus (up to 27% of the body volume) showed favorable trophic conditions for the species in the deep-sea areas with ongoing warming in the Black Sea region.
Biologiya Morya. 2025;51(4):220-231
220-231
КРАТКИЕ СООБЩЕНИЯ
Karyotypes of the sailfin sculpins Hemitripterus villosus (Pallas, 1814), Blepsias cirrhosus (Pallas, 1814), and B. bilobus Cuvier, 1829 (Actinopterygii: Hemitripteridae)
Abstract
The karyotypes of the sailfin sculpins Blepsias bilobus and B. cirrhosus were studied for the first time, and the chromosome set of Hemitripterus villosus was analyzed. It was found that the karyotypes of these species are stable and consist of 46 chromosomes (2n) in H. villosus: 4 metacentric (M), 32 subtelocentric (ST), and 10 acrocentric (A); the number of chromosome arms (NF) is 50. In Blepsias bilobus, the chromosome set is 2n = 48 (34 ST and 14 A chromosomes), NF = 48; in B. cirrhosus, 2n = 48 (36 ST and 12 A chromosomes), NF = 48. Based on comparative karyological analysis, common features were identified that confirm the close relationships between B. bilobus and B. cirrhosus, and the taxonomic proximity of H. villosus to species of the genus Blepsias. The features that allow differentiation of the studied species were also determined.
Biologiya Morya. 2025;51(4):232-236
232-236