The introduction of alien species to marine islands leads to the destabilization of the unique ecosystems characterized by a high level of ecological vulnerability. A review of alien mammal species in the insular theriocomplexes of the Northwestern Pacific was made, and the results of a massive invasion that occurred in the last 150 years were analyzed. Currently, the islands of the Northwestern Pacific are inhabited by 43 alien species belonging to 19 families of 7 mammal orders, 9 of which are included in the list of the the world’s 14 most dangerous invasive species, and the islands of the Russian segment of this region are inhabited by 8 of the 10 most dangerous introduced mammals of the Russian Federation.

The data about finding of Macrosaccus robiniella (Clemens, 1859) (Lepidoptera, Gracillariidae) and Obolodiplosis robiniae Haldeman, 1847 (Diptera, Cecidomyiidae) in Voronezhsky State Nature Biosphere reserve are given for the first time. Some features of the biology of the local population of M . robiniella are shown.

If the invasion of alien species into the vegetation cover leads to an increase in the area of monodominant communities, then this may have negative consequences for native plant species in the long term. We compared the frequency of occurrence of communities with the dominance of alien species, with the dominance of native species, as well as polydominant communities, in 71 sites of synanthropic vegetation in the vicinity of the settlements of the Republic of Adygea and the Krasnodar Territory (Russia). The results showed that sites with a higher frequency of alien species dominance are characterized by a predominantly lower frequency of native species dominance, as well as a lower occurrence of polydominant communities, and, accordingly, a higher occurrence of monodominant communities in general. At the same time, the peculiarities of the biology of alien plant species reaching a high coverage in the studied areas suggest that this is due, rather, to the ability of alien species to quickly populate disturbed (open) habitats than to displace native species from closed grass stands. Therefore, the influence of the factor assessed by us on the floristic richness of synanthropic vegetation in the study area can be considered as limited. However, in other regions of the world, as follows from the publications known to us, it can be significant.

The paper provides information on new species of the Poaceae family, alien for the flora of Dagestan and the Eastern Caucasus, identified during field studies and in the analysis of various herbarium collections in 2020-2022. For the flora of the Eastern Caucasus, Echinochloa tzvelevii and Setaria adhaerens are indicated for the first time, and the presence of feral cultivated species in the flora of Dagestan is confirmed: Avena sativa, Lolium multiflorum, Sorghum drummondii, Sorghum technicum . For the first time for the flora of Dagestan, the quarantine species Cenchrus longispinus is presented. For each species, a brief description of the location is given, information on population status, phenophase, etc. is presented. In addition, an invasive status was assigned to each species, according to the criteria and guidelines used in the work on the regional "Black Books". Sorghum technicum and Cenchrus longispinus have a higher invasive potential (status 2), while the remaining 5 species ( Avena sativa, Echinochloa tzvelevii, Lolium multiflorum, Sorghum drummondii, Setaria adhaerens ) occur in disturbed and segetal communities (status 3).

The article presents an overview of alien fish species living in cooling ponds of nuclear power plants and state district power stations in Central Russia. A brief description of recipient reservoirs is given as a habitat for thermophilic fish species that are not characteristic of the native ichthyofauna of the region. The essays on the history of the appearance of these species, the peculiarities of biology, occurrence in catches, and fishery significance in six small reservoirs of special water management located within the borders of the Moscow, Smolensk, Ryazan, and Kursk oblasts of Russia are given. The main vectors of invasions of hydrobionts in cooling ponds for each alien species recorded as a result of ichthyological monitoring in this group of reservoirs are shown. The forecast of the dynamics of the number of alien fish species is given depending on changes in the thermal regime of reservoirs and the volume of stocking and the intensity of fishing in the cooling ponds of nuclear power plants and state district power plants of Central Russia.

This paper describes the first discovery of Sinanodonta woodiana and S. lauta in the artificially heated section of the Reft Reservoir (Sverdlovsk oblast, Reft River, Ob–Irtysh River basin). The discovered Sinanodonta populations are represented by invasive haplotypes E3 (S. woodiana) and C3 (S. lauta). The alien populations include S. woodiana and S. lauta individuals belonging to various size and age groups, which indirectly indicates the successful naturalization of these species. Old-aged individuals (over 10 years) predominate in the S. woodiana population (56%), while middle-aged ones prevail in the S. lauta population (48%). Sinanodonta individuals under 1 year old (shell length less than 25 mm) were not found, and specimens aged 2–3 years occur rarely. On the basis of the molecular data and archival fishery records, it can be assumed that this invasion of S. woodiana and S. lauta into the Reft Reservoir is associated with the introduction of commercial fish species from Volga fish farms at the end of the 20th and the beginning of the 21st century.

Data on composition and naturalization patterns of more than twenty adventive butterfly species that expanded to the northeastern part of the Russian Plain during the period of 1990–2021 are compiled. It is shown that lines of transport communications such as highways, railways, power lines, and gas and oil pipelines serve as the main immigration corridors for butterfly species from southern regions. Anthropogenic transformation of indigenous taiga forests through industrial logging operations, largely expanding areas of open habitats, which are more suitable for butterflies, promotes successful naturalization of adventive species. Linear systems of technical and industrial constructions together with river valleys play a role of seminatural corridors for the expansion of adventive species. Furthermore, secondary small-leaved and mixed forests surrounded by a network of forest edges and meadows represent a kind of staging areas for the establishment of populations of adventive species. Groups of adventive species are delineated on the basis of their naturalization status that was estimated on the basis of an integral assessment of their biocenotic stability and landscape activity. A conclusion is drawn that ongoing expansion and naturalization of adventive butterfly species on the northeastern part of the Russian Plain will increase changes in the composition of local and zonal faunas and the spatial and typological structure of their populations.

In Primorsky Krai, on the invasive naturalized species of ragweed (Asteraceae: Ambrosia artemisiifolia L.), the species Phycitodes subcretacella (Ragonot, 1901) was found for the first time. The ragweed is recorded as a host plant for moth Ph. subcretacella for the first time, and this fact broadens the list of phytophages of this weed plant. New data on the biology of Ph. subcretacella are given and photographs of the genitalia of both sexes with indication of diagnostic characters are shown for the first time, which make it possible to distinguish the species from related taxa. It has been established that the larvae of Ph. subcretacella damage the apical parts of the stems on which the generative organs of the plant are located that can significantly reduce the reproductive potential of ragweed.