The finding of the oriental river prawn Macrobrachium nipponense (De Haan, 1849) in the lower Terek river (Caspian basin) - Afanasyev  D.F.,  Zhivoglyadova  L.A.,  Nebesikhina  N.A.,  Magomedov  M.A.,  Mutallieva  Yu.K.b,  Velibekova  B.D., Mirzoyan  A.V. - The data on the discovery of a new species of prawn for the estuarine ecosystems of the Western Caspian Sea – Macrobrachium nipponense (De Haan, 1849) (Decapoda, Crustacea) are given. Several specimens of oriental river prawns were found in the lower streams of the river Terek, 24 km upwards the mouth. To determine the taxonomic status of the prawn, DNA barcoding of the COI gene was performed. The COI gene sequence obtained highly correlates with previously published data in the GenBank and BOLD databases (99%). Phylogenetic analysis revealed the genetic proximity of M. nipponense from river Terek to the native population of the prawn that lives in the river Huaihe in the area of Huaibin and Huainan (China). Biological features of the species suggest a high probability of successful naturalization of the species in the estuarine systems of the Caspian Sea and its further expansion.

Features of Anadara kagoshimensis (Bivalvia, Arcidae) biocenotic relations in the Kazachya bay of the Black sea - Bondarev  I.P. -The bivalve mollusk Anadara kagoshimensis is classified among the 100 most dangerous invasive species of the Mediterranean and Black seas. Using the example of the settlement of anadara in the Kazachya (Cossack) Bay (Crimea, the Black Sea), biocenotic relations of the mollusk with bottom grounds, epibionts, potential environmental competitors and predator – Rapana venosa - are revealed and discussed. Relations with the complex of phytoepibionts and zooepibionts are given for A. kagoshimensis for the first time. It is shown that anadara can be an edificator and form a specific complex of algoconsorts and zooconsorts, playing a positive role in increasing and preserving the species diversity in certain areas of the Black Sea. The increase in biomass and diversity of mollusks – filter feeders since the onset of anadara in the study area speaks in favor of its positive effect on the biocenosis.

Anthropogenic invasion of micromycetes to undesturbed ecosystems of Larsemann Hills oasis (East Antarctica) - Vlasov  D.Yu.,  Kirtsideli  I.Yu.,  Abakumov  E.V.,  Novozhilov  Yu.K.,  Zelenskaya  M.S.,  Barantsevich  E.P. -Antarctic station Progress is the largest Russian Antarctic station. The anthropogenic impact on primary soils in the area of this station is reflected in the chemical structure of soils and the structure of microbial communities. The article shows a multiple increase in the number of microorganisms (especially microscopic fungi) in contaminated soils around the Progress station. Anthropogenic impact changes the structure of complexes of soil microorganisms. The percentage of mesophilic microorganisms increases significantly. In the samples of primary soils and anthropogenic substrates, 53 species of micromycetes from 28 genera were identified. Their diversity decreases from anthropogenic soils and anthropogenic substrates to control soils. It was shown that an increase in the number of species on the polar station area is the result of the invasion of new species of micromycetes connected with human activity. Some native species of micromycetes are able to adapt to anthropogenic substrates and can be destructors of different materials. Among micromycetes from polluted soils and anthropogenic substances, more than 56% and 70%, respectively, can be referred to potentially pathogenic species. Thus, the invasive processes change the structure of micromycetes complexes in soil, which can serve as an indicator of anthropogenic impact on ecosystems in the Larsemann Hills oasis of East Antarctica.

Great egret Casmerodius albus in Novgorod oblast in 2016-2018 - Zueva  N.V.,  Arkhipov  V.Yu.,  Denisenkova  T.V.,  Ryzhenkova  V.A.,  Kotkin  A.V. -Ninety six registrations of Great egret from 10 districts of Novgorod Oblast in 2016–2018 were analyzed. The birds were seen from single individuals up to 170 birds in one aggregation. The main areas of registrations of this species are surroundings of Novgorod city and Ilmen Lake. The birds were seen on the territory from February 25 to October 31. We did not get documental evidences of this species breeding, but the breeding is possible. At present, the Great egret has to be considered as a summering, possibly breeding and single wintering species of Novgorod Oblast.

Naturalization of striped seabream Lithognathus mormyrus (Sparidae) in the Black sea- Karpova E.P.-The morphological and biological characteristics of the striped seabream Lithognathus mormyrus of the Black Sea were investigated. The conclusion about the naturalization of this species in the Black Sea as a result of the natural process of mediterranization was made on the basis of numerous finds of adult individuals and juveniles of this species.

The settlement of Erigeron annuus (L.) pers. and analysis of the reasons for reproductive success  - Kudryavtseva  E.I.,  Vinogradova  Yu.Kir.,  Witing  K.B.,  Kozyrev A.M.,  Nefedov  A.D.,  Petrash  E.G.,  Stukalov  A.S.,  Sainova  A.D.,  Reshetnikova  N.M.-The article discusses the reasons for the broad distribution of Erigeron annuus in Central Russia: its biology (habitat, seed productivity, seed distribution) and its ability to allelopathic influence. In the experiments, the following indicators were used to assess the effect of Erigeron annuus on other species: seed germination, development rate, and length of the sub-cotyledon knee. Erigeron annuus seeds have been found to have an inhibitory effect on the development of seedlings in a number of species (Trifolium pratense, Raphanus sativus, and Avena sativa). Most of the experiments clarifying the effect of Erigeron annuus were performed on Trifolium pratense.

Environmental factors of conchological variability of the common viviparous snail Viviparus viviparus (L., 1758) (Mollusca: Gastropoda) in Novosibirsk reservoir - Kuzmenkin  D.V.,  Yanygina  L.V.-The article contains the results on the study of shell variability of the common viviparous snail (Viviparus viviparus (L., 1758)), an alien species to Western Siberia, in the conditions of the Novosibirsk Reservoir. The conchological variability of the common viviparous snail was investigated using methods of discriminant and dispersion analysis. It has been revealed that in different parts of the reservoir separate populations of common viviparous snail are formed, which differ in the proportions of shells. A statistically significant relationship between the spatial differentiation of the shape of shells and the depth of habitat was noted. Differences in temperature and food availability in the coastal and relatively deep-water areas of the reservoir may have a leading role in morphological differentiation. The morphological changes in the common viviparous snail, which occurred in a short time since the appearance of this species in the Novosibirsk Reservoir, indicate their ability to adapt quickly and a high invasive potential of the species.

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Change of low-molecular-weight metabolome of alien species Potamogeton pectinatus L. in lake Ladoga in comparison with native range - Kurashov E.A., Krylova  J.V.,  Rusanov  A.G.- The question of the formation of the component composition of low-molecular-weight organic compounds in aquatic macrophytes constituting their low-molecular-weight metabolome, when moving into new habitats, remains to be explored. The aim of this work is to carry out a comparative study of the component composition of the low-molecular-weight metabolome of sago pondweed (Potamogeton pectinatus L.) on the low-molecular-weight organic compounds contained in its essential oil from the invasive population in Lake Ladoga and populations from the native range in the Astrakhan Oblast of the Russian Federation. The main method of the research is gas chromatography mass spectrometry. It is shown that during the invasion of P. pectinatus into Lake Ladoga, there was a change in the content of various groups of low-molecular-weight organic compounds in the essential oil and a change in the complex of major components. Fatty acids (29.3–40.0%) and ketones (14.5–18.5%) prevailed in the low-molecular-weight metabolome of sago pondweed in the lakes of the native area. Ketones (27.4%) and aldehydes (18.1%) were the main groups in this species from Lake Ladoga. About a third of the compounds in the composition of the low-molecular-weight metabolome were specific both to the invasive population of the sago pondweed in Lake Ladoga and to the population of the species from the lakes of the native range. The plasticity of the metabolism of P. pectinatus allows it to adapt to a wide spectrum of abiotic conditions and different biological environments and to move into new habitats, especially in those which are under the anthropogenic impact.

Attagenus gobicola Frivaldszky, 1892 and Anthrenus picturatus Solskij, 1876 (Coleoptera: Dermestidae) - the new invasive species of carpet beetles in the fauna of Belarus- Ostrovsky  A.M. - For the first time the actual material collected in the territory of the city of Gomel is given for a new to the fauna of the republic of Belarus alien east-palearctic species of carpet beetles Attagenus gobicola Frivaldszky, 1892 (Coleoptera: Dermestidae). This species is a dangerous pest of keratin-containing materials, zoological collections and grain products, the natural range of which includes arid and foothill areas of the central and eastern parts of Central Asia. Information on current species distribution, as well as the features of biology and ecology is given. The find of Anthrenus picturatus Solskij, 1876 mentioned in the article is also the first one for Belarus.

Thladiantha dubia Bunge in the Bryansk oblast: distribution, ecology, biochemical characteristics - Panasenko  N.N.,  Anishchenko  L.N. - Thladiantha dubia Bunge is an East Asian species, a perennial herbaceous climbing vine, which naturally grows in the Russian Far East, Northeast China and Korean Peninsula. In Central Europe, North America, South America (Ecuador) and Japan it is an alien species. In most European countries Th. dubia is not an invasive plant. In the European part of Russia Th. dubia is bred as an ornamental plant, and is found in a variety of disturbed habitats. In some regions of Russia it has an invasive status. The distribution of Th. dubia in the Bryansk Oblast was studied using grid mapping. The species was observed in 69 of 223 examined squares (30.94%). Th. dubia occurs in disturbed habitats, wastelands, and housing. We have discovered and studied communities dominated by Th. dubia. In the anthropogenic habitats the species forms monodominant resistant communities. Based on the analysis of geobotanical descriptions of the communities, we established the association Thladianthetum dubiae ass. nov. The formation of a monodominant community is possible due to vegetative propagation and decrease in the illumination of the soil cover. Th. dubia secretes colins – growth inhibitors. Presumably, an invasion vector of Th. dubia is anthropochoria. In the territory of the Bryansk Oblast Th. dubia is a potentially invasive species. Biomass of this plant is characterized by a good absorption capacity of some heavy metals and can be used as a soil remediator.

Brown algae of the genus Cystoseira in the sea of Azov: settling or expansion of the range? - Stepanyan  O.V.- Currently, the habitats of Cystoseira in the Sea of Azov and Kerch Strait are concentrated in the southern part of the Gulf of Taman on the east part of Tuzla, Cape Achillion and Kerch Peninsula – between Cape Khroni and Kazantip. It is shown that the main vector of Cystoseira settlement is directed to the southern-western part of the Sea of Azov, which is facilitated by the compensatory bottom current from the Black Sea, which at the entrance to the Sea of Azov from the Kerch Strait deviates to the west. In studies 2014–2017, Cystoseira barbata was discovered in 2014 in the area of Cape Zyuk (village Kyrortnoe) and in 2017 at Cape Chagani (village Zolotoe) in the Kazantipsky Gulf. In expeditions of 2018 in the area of the actual Cape Kazantip representatives of Cystoseira were not detected. Probably, the findings of Cystoseira at Cape Kazantip can be expected in the near future, but further progression of brown algae will be limited to loose soils. Conditions of the Sea of Azov are an ecological boundary of the range of the genus Cystoseira, and for these algae pulsation of the range border is characteristic. Factors that cause the expansion of the range of algae of the genus Cystoseira in the Sea of Azov are an increase in salinity, transparency and temperature of the sea water. The factors causing the narrowing of the Cystoseira range in the Sea of Azov are a decrease in salinity, water transparency and an increase in the number of severe winters with ice. Algae of the genus Cystoseira are good biological indicators for long-term observations of changes in the hydrological regime of the sea. But to consider them invaders in the Sea of Azov is hardly competent.

Parasites of so-iuy mullet Planiliza haematocheila (Temminck & Schlegel, 1845) (Actinopterygii: Mugilidae) in native range and places of introduction - Yurakhno  V.M.- The data on the whole parasitofauna of so-iuy mullet Planiliza haematocheila on the basis of published and personal data are generalized for the first time. Features of its similarity and differences in the native Pacific region and in the areas of invasion – the Black Sea and the Sea of Azov - have been identified. Potentially pathogenic parasitic species for host health have been detected. It is assumed that cases of causing mortality of so-iuy mullet by parasites are due to the youth of parasitic-host relations, for all such species were acquired by so-iuy mullet during the invasion to the Sea of Azov. Known practical recommendations to reduce the negative impact of one of the groups of macroparasites – trematodes on so-iuy mullet population in the Azov basin are listed.