Alexander A. Bobrov

• Doctor of Philosophy
• Principal Researcher at Papanin Institute for Biology of Inland Waters RAS

The new data on locations of 5 vascular plant species of included in the regional Red Data Books of the Chukotka Autonomous Okrug, of the Republic of Sakha (Yakutia), and of Magadan Oblast. The disappearance of Nymphaea tetragona from the northernmost location in Chukotka has been recorded.

We have summarized the distribution of Potamogeton hybrids in Siberia based on extensive field and herbarium work. Four most common broad-leaved Potamogeton hybrids, P. × angustifolius, P. × nitens, P. × salicifolius and P. × sparganiifolius, and one very rare P. × cognatus occur in 178 localities, of which 108 are newly reported ones. Hybrids are...

Supplementary data to Bobrov A. A., Efimov D. Yu., Chemeris E. V., Efimova L. A., Tikhomirov N. P. Hybrids of broad-leaved Potamogeton (Potamogetonaceae) are common in Siberia // Flora. 2025. Vol. 323. 152663. doi: 10.1016/j.flora.2024.152663

Supplementary data to Bobrov A. A., Efimov D. Yu., Chemeris E. V., Efimova L. A., Tikhomirov N. P. Hybrids of broad-leaved Potamogeton (Potamogetonaceae) are common in Siberia // Flora. 2025. Vol. 323. 152663. doi: 10.1016/j.flora.2024.152663

Data on the new localities of Lemna minor, L. trisulca, and hybrid between L. minor and L. turionifera (L. × japonica) (Lemnaceae) in the north-west of the Murmansk Region (north of 68.5° N), i.e., in the Pasvik State Nature Reserve and neighboring territories in the drainage basin of the Paz River, are presented. Lemna minor and L. trisulca were p...

Supplementary data to Grigoryan M. Yu., Volkova P. A., Ivanova M. O., Mochalova O. A., Logacheva M. D., Neretina T. V., Bobrov A. A. No endemic Isoëtes (Isoëtaceae) species in the North Asian Pacific evidenced by genetic and morphological analysis // Aquat. Bot. 2025. Vol. 198. 103850. doi: 10.1016/j.aquabot.2024.103850

Supplementary data to Grigoryan M. Yu., Volkova P. A., Ivanova M. O., Mochalova O. A., Logacheva M. D., Neretina T. V., Bobrov A. A. No endemic Isoëtes (Isoëtaceae) species in the North Asian Pacific evidenced by genetic and morphological analysis // Aquat. Bot. 2025. Vol. 198. 103850. doi: 10.1016/j.aquabot.2024.103850

The genus Isoëtes is a unique group of lycophytes that offers valuable insights into plant evolution. However, taxonomic issues and evolutionary pathways within the genus require further study, particularly in North-East Asia, where only representatives of the I. echinospora complex occur. We studied genetic (nuclear DNA LFY2int and IBR3 regions, t...

Recent evaluation of the conservation status of all native plant taxa in Tajikistan revealed that plants of wet habitats are among the most threatened in the country. As aquatic plants are frequently overlooked in the field and misidentified, we aimed to test their reported rarity in Tajikistan. To achieve this, we performed field inventory of vasc...

Supplementary data to Volkova P. A., Ivanova M. O., Efimov D. Yu., Chemeris E. V., Vinogradova Yu. S., Grishutkin O. G., Konotop N. K., Efimova L. A., Tikhomirov N. P., Zueva N. V., Bobrov A. A. Climate-dependent distribution of Lemna minor, L. turionifera and L. × japonica (Lemnaceae) in temperate Eurasia and high variability of their genome size...

Supplementary data to Volkova P. A., Ivanova M. O., Efimov D. Yu., Chemeris E. V., Vinogradova Yu. S., Grishutkin O. G., Konotop N. K., Efimova L. A., Tikhomirov N. P., Zueva N. V., Bobrov A. A. Climate-dependent distribution of Lemna minor, L. turionifera and L. × japonica (Lemnaceae) in temperate Eurasia and high variability of their genome size...

The first complete and updated checklist of vascular plants of Asian Russia is compiled. It is based on “Checklist of Flora of Asian Russia: Vascular Plants” (Baikov 2012) but incorporates numerous floristic, taxonomic and nomenclatural novelties. The territorial scope of the checklist is constituted by three federal districts of Russia (Ural, Sibe...

In spite of a burst of duckweed biology studies, understanding their diversity is still in progress. We examined 174 reliably-identified (intron length polymorphism in TUBB1) samples of the Lemna minor complex from East Europe and North Asia (41 localities of L. minor, 58 localities of L. turionifera, and 75 localities of their hybrid, L. × japonic...

Data on the new localities of Lemna minor, L. trisulca, and hybrid between L. minor and L. turionifera (L. × japonica) (Lemnaceae) in the northwest of the Murmansk region (north of 68.5° N), i.e., in the Pasvik State Nature Reserve and neighboring territories in the drainage basin of the Paz River, are presented. Lemna minor and L. trisulca were pr...

Investigations of South-western geobotanical district of Sakhalin Island, which is classified as a separate subzone of dark coniferous forests with an admixture of broad-leaved species and corresponds to Krillon floristic district, revealed a number of new aquatic vascular plant species for that area (Lemna turionifera, Myriophyllum verticillatum,...

According to data of the late 20th century in the Trans-Baikal and Baikal areas, the family Najadaceae is represented by four species known in few localities: Caulinia flexilis (4 localities), C. minor (3), and Najas major (3), N. marina (4). All of them are annuals, r-strategists, which are characterized by fluctuations in abundance. Since the 21s...

Since 2012, the diversity of aquatic vascular plants in North-East Russsia (East Siberia and the Far East) has been revised and our data on diversity composition have been increased by ca. 10%, as well as the taxonomic composition have been significantly refined. Special attention was paid to poorly studied parts of this area, both by direct study...

Aquatic vascular plants of the Omolon River valley are represented by 49 taxa (44 species and 5 hybrids) from 24 genera and 18 families. Lemna trisulca, L. turionifera, Potamogeton × nitens (P. gramineus × P. perfoliatus), Sparganium rothertii, S. × longifolium (S. gramineum × S. rothertii), S. × obscurum (S. natans × S. hyperboreum) are recorded f...

The ongoing climatic changes and human activities have a significant impact on the ecosystems of the Kolyma River valley. Analysis of materials of R. E. Trufanova of 1966–1969 on aquatic vascular plants of water bodies of the lower reaches of the Kolyma River, original data and field observations in 2020 and multi-temporal satellite images showed t...

1. Isoëtes are iconic but understudied wetland plants, despite having suffered severe losses globally mainly because of alterations in their habitats. We therefore provide the first global ecological assessment of aquatic Isoëtes to identify their environmental requirements and to evaluate if taxonomically related species differ in their ecology. 2...

Aquatic flora of Dagestan, the diverse region connecting the Caucasian and Aralo-Caspian floristic provinces, received little research effort. Therefore, we conducted two expeditions across aquatic and wetland habitats of Dagestan in June and September 2021 and analyzed public records of aquatic plants from the GBIF database. We report new data on...

Supplementary data to Tikhomirov N. P., Volkova P. A., Ivanova M. O., Bobrov A. A. New data on aquatic flora of Dagestan // Biol. Bull. 2024. Vol. 51. N 2. P. 1—7. doi: 10.1134/S1062359023605554

Supplementary data to Volkova P. A., Ivanova M. O., Bobrov A. A. Multi-approach inventory of aquatic vascular plants in Kyrgyzstan provides new data on biodiversity of Central Asia // J. Asia-Pac. Biodivers. 2024. Vol. 17. N 1. P. 200—207. doi: 10.1016/j.japb.2023.09.002

Myriophyllum sibiricum and M. spicatum are sympatric in large part of their vast areas in Eurasia and North America and have different habitat preferences only in East Europe and Siberia. Such absence of both geographic and ecological isolation should trigger extensive hybridization between these species that is indeed observed in North America. Th...

Freshwater plants of Central Asian Mountains (a global biodiversity hotspot) remain poorly studied. We performed extensive field inventory of vascular plants in different types of waterbodies in northeastern Kyrgyzstan. By joint morphological and genetic analysis, we revealed a new, previously undetected, hybrid (Utricularia macrorhiza × U. vulgari...

We present chromosome-level genome assemblies from representative species of three independently evolved seagrass lineages: Posidonia oceanica, Cymodocea nodosa, Thalassia testudinum and Zostera marina. We also include a draft genome of Potamogeton acutifolius, belonging to a freshwater sister lineage to Zosteraceae. All seagrass species share an a...

Supplementary data to Volkova P. A., Ivanova M. O., Bobrov A. A. The search for hybrids between Myriophyllum sibiricum and M. spicatum (Haloragaceae) in North Eurasia allowed to clarify their morphological differences and distribution // Aquat. Bot. 2024. Vol. 191. 103741. doi: 10.1016/j.aquabot.2023.103741

Supplementary data to Efimov D. Yu., Pimenov A. V., Bobrov A. A. Najas marina (Hydrocharitaceae) in southern Middle Siberia, refinds after a century-old recess // Inland Water Biology. 2023. Vol. 16. N 6. P. 1178—1184. doi: 10.1134/S1995082923060081

In the south of the Krasnoyarsk Territory (Middle Siberia, Russia), the presence of N. marina was confirmed by new findings, in addition to historical collections, which were made more than 100 years ago in the South-Minusinsk basin. We have found this species additionally in three lakes in the North-Minusinsk basin, which are the northernmost loca...

Тhe first results of the study of aquatic macrophytes of the Upper Indigirka River area are presented. The species composition includes ~84 species (~74 vascular plants and more than 10 cryptogamous macrophytes). 47 water bodies of different age, size and origin (tectonic, glacial, river, thermokarst and artificial) were studied. For each type of w...

In the south of the Krasnoyarsk Territory (Middle Siberia, Russia), the presence of N. marina was confirmed by new findings, in addition to historical collections, which were made more than 100 years ago in the South-Minusinsk basin. We have found this species additionally in three lakes in the North-Minusinsk basin, which are the northernmost loca...

Supplementary data to Ivanova M. O., Volkova P. A., Yakubov V. V., Kopylov-Guskov Yu. O., Dadykin I. A., Bakhmarin S. V., Bobrov A. A. Floristic survey of Karaginskii Island (southwest Bering Sea) revealed predictably high diversity of aquatic plants and unexpectedly overlooked terrestrial species // Botanica Pacifica. 2023. Vol. 12. N 2. P. 73—80....

Given the high diversity of aquatic habitats with favorable microclimate, surprisingly low number of aquatic vascular species was reported from Karaginskii Island. Therefore, we conducted its extensive field inventory. Terrestrial and bog plant species were also registered on the island whenever possible to check for general completeness of florist...

The increase in average annual air temperatures recorded in recent decades in Russia is especially noticeable in temperate and polar regions. This has already led to change in the important characteristics of the aquatic environment of inland water bodies, primarily to a change in the ice regime and an increase in the duration of the “biological” s...

Supplementary data to Bobrov A. A., Volkova P. A., Mochalova O. A., Chemeris E. V. High diversity of aquatic Sparganium (Xanthosparganium, Typhaceae) in North Eurasia is mostly explained by recurrent hybridization // Perspect. Plant Ecol. Evol. Syst. 2023. Vol. 60. 125746. doi: 10.1016/j.ppees.2023.125746

The species composition and extent of hybridization in Sparganium subgenus Xanthosparganium in North Eurasia reported in different published sources significantly vary. Thus, we aimed to clarify the taxonomy and distribution of aquatic Sparganium in that area. We supplemented the existing fragmentary genetic and morphological data mainly from North...

Aquatic macrophytes of the Kava River basin in the northern Okhotsk area are represented by four species of macroalgae and 51 species and four hybrids of vascular plants. The flora of Magadan oblast was expanded to include another three species and three hybrids; namely, Aegagropilopsis moravica, Equisetum arvense × E. scirpoides, Elatine aff. tria...

Using published and herbarium data, and internet resources, the change in distribution of the aquatic fern Salvinia natans (Salviniaceae) in Russia has been traced since the beginning of 20th century until 2021 and the current boundaries of its range is identified. Among the bioclimatic and temperature indicators that determine the distribution of...

Aquatic macrophytes of the Kava River basin in northern Okhotsk area are represented by 4 species of macroalgae and 51 species and 4 hybrids of vascular plants. Flora of the Magadan Region was completed by 3 species and 3 hybrids: Aegagropilopsis moravica, Equisetum arvense × E. scirpoides, Elatine aff. triandra vel americana, Potamogeton × vepsicu...

According to publication and literature, herbarium data, materials of Internet resources, the change in distribution of aquatic fern Salvinia natans (Salviniaceae) on Russian territory was traced since the beginning of XX century until 2021, and the current boundaries of its range were determined. Among the bioclimatic and temperature indicators th...

Seagrasses comprise the only submerged marine angiosperms, a feat of adaptation from three independent freshwater lineages within the Alismatales. These three parallel lineages offer the unique opportunity to study convergent versus lineage-specific adaptation to a fully marine lifestyle. Here, we present chromosome-level genome assemblies from a r...

Biodiversity studies and practical use of duckweeds are impossible without reliable species identification. Despite of clear genetic differentiation of L. minor, L. turionifera and their hybrid L. × japonica, their morphological discrimination is challenging even for professional botanists; consequently, the distribution of the two latter taxa are...

Aquatic plant species are often widespread, even across continents. They pose a challenge to species delimitation and taxonomy due to their reduced morphology and high phenotypic plasticity. These difficulties are even more pronounced in the case of interspecific hybridization. We investigate the aquatic plant genus Stuckenia for the first time on...

Ranunculus oblitus, a new species of Ranunculus section Batrachium, is described from South America. The species is significantly different from the European laminar-leaved species R. aquatilis, and the Holarctic submerged species R. trichophyllus. It resembles the North Asian-North American species R. mongolicus differing by narrower petals, large...

An assessment of the vegetation cover of the transboundary Paz River based on the materials of 2019 demonstrated a high diversity of flora that is uncharacteristic of other rivers in northern Fennoscandia. The core of the vegetation cover consists of Sparganium angustifolium, Myriophyllum alterniflorum, Ranunculus schmalhausenii, Potamogeton gramin...

We demonstrate a wide distribution and abundance of hybrids between the river species Ranunculus aquatilis, R. fluitans and R. kauffmannii with the still water species R. circinatus (Batrachium, Ranunculaceae) in rivers of two postglacial landscapes of East Europe, i.e., Lithuania and Central European Russia. The Batrachium species and hybrid diver...

The taxonomic status of endemic Callitriche taxa from western Beringia (C. subanceps) and the Lower Volga (C. fimbriata, C. transvolgensis) has been poorly studied. To investigate this question we compared endemic taxa with close Callitriche species. To achieve this goal we studied nuclear (ITS) and plastid (trnS-trnG, petL-psbE, trnH-psbA) genetic...

Assessment of the vegetation cover of the transboundary Paz River on the materials from 2019 demonstrated a high diversity of flora, uncharacteristic for other rivers in northern Fennoscandia. The core of vegetation cover consists of Sparganium angustifolium, Myriophyllum alterniflorum, Ranunculus schmalhausenii, Potamogeton gramineus, P. perfoliat...

Changes in the higher aquatic vegetation (HAV) of the protected shallow water “Krasnyi Ruchei” from 1989 to 2019 have been analyzed based on aerial imageries, multidate satellite images, and direct field studies. Images from the second half of July to late September are used to study of the overgrowing. An inverse relationship has been found betwee...

Most of Utricularia taxa in temperate Eurasia are poorly distinguished by vegetative characters, while flowering is rare in some of them. Thus, we aimed to clarify the taxonomy and distribution of temperate Eurasian Utricularia. We supplemented the existing results of intensive morphological and genetic studies of Utricularia mainly from West and C...

Changes in the higher aquatic vegetation (HAV) of the protected shallow water “Krasnyi Ruchei” from 1989 to 2019 have been analyzed based on aerial photographs, satellite images of different times and direct field studies. Images from the second half of July up to the end of September have been used for study of the overgrowing. An inverse relation...

Data are presented on Stuckenia filiformis (Potamogetonaceae) records from new localities in the north of the Murmansk Region, i.e. in the Pasvik State Nature Reserve and its neighboring territories in the Paz River catchment. S. filiformis is a rare plant in the region listed in the Red Book of the Murmansk Region with status 3. It was found in 3...

High morphological variation of Typha L. species (Typhaceae) inspires some authors to describe new taxa. We aim to test genetic distinctiveness of some taxa reported in East Europe on morphological basis to verify their taxonomical status. We use sequences of intergenic spacer rpl32-trnL of cpDNA that was shown to be a reliable molecular marker in...

Special (although brief) investigations of aquatic vascular plants on Sakhalin Island let us reveal four taxa new to the island: Potamogeton × orientalis (P. berchtoldii × P. oxyphyllus), new to Russia, as well as Stuckenia × suecica (S. filiformis × S. pectinata), Utricularia minor and U. × ochroleuca (U. intermedia × U. minor), new to Sakhalin. W...

Central part of the Kuril Archipelago (the Russian Far East) remains the least studied due to its poor accessibility. Such insufficient floristic data lead to uncertainties in floristic subdivision of the Kuril Islands. We aimed to explore the vascular flora of the Simushir island, the largest one among the Middle Kurils. We revealed 24 new species...

Isoëtes L. is a cosmopolitan genus comprising about 200 species, almost half of them being allo- or autopolyploids. We investigated the origin of decaploid I. lacustris using next generation sequencing (NGS). We sequenced the second intron of LEAFY (LFYint2) and analysed the morphology of seven samples of I. lacustris from five localities from East...

Potamogeton is a cosmopolitan genus of aquatic plants comprising ca. 72 species and 99 hybrids. Hybridization and polyploidization events are characteristic of its evolutionary history, thus molecular approach is desirable for confirmation of species and hybrids determinations. In this study, we tested the suitability of low-copy nuclear gene PHYB...

Aquatic vascular plants of the National Park “Beringia”, the easternmost nature protected area of Russia, as well as east Chukotka as a whole, are represented by 44 taxa (40 species and 4 hybrids) from 23 genera and 18 families. A low diversity of the aquatic plants is associated with severe (low average annual temperatures, short growing season wi...

Flora of the southern Kuril continental islands is extremely diverse due to the complex history of geology and climate, fluctuating connections with other territories in the past and the habitat diversity of the archipelago. It is likely well-investigated due to the long history of botanical studies, and floristic findings are expected only in taxo...

Specialized investigations of aquatic vascular plants on the Island Kunashir and islands of the Lesser Kuril Ridge (Kuril Islands, Sakhalin Region) gave abundant new information on flora of separate islands and the whole archipelago. Taking into account our new data and critical revision of the existing materials, the annotated list of aquatic vasc...

Aquatic Ranunculus (sect. Batrachium) include homophyllous and heterophyllous plants. The development of floating leaves may be induced by genetic mechanisms or/and environmental conditions and this fact complicates the morphologically based identification of species. DNA-based studies provide the opportunity to expand the knowledge of this complic...

Красная книга Архангельской области. Архангельск: САФУ, 2020. 490 с.

Aims To create a comprehensive, consistent and unequivocal phytosociological classification of European marsh vegetation of the class Phragmito‐Magnocaricetea . Location Europe. Methods We applied the Cocktail method to a European data set of 249,800 vegetation plots. We identified the main purposes and attributes on which to base the classificat...

For the first time, summarized data on the production of nine species and ten hybrids of pondweed (Potamogeton, Stuckenia, and Potamogetonaceae) are given for ecosystems of small and medium rivers of the northern European Russia. The pondweed is shown to be an important producer of primary organic matter. A significant contribution to primary produ...

For the first time, summarized data on the production of nine species and ten hybrids of pondweed (Potamogeton, Stuckenia, and Potamogetonaceae) are given for ecosystems of small and medium rivers of the northern European Russia. The pondweed is shown to be an important producer of primary organic matter. A significant contribution to primary produ...

Features of biomorphology of homophyllous water crowfoot Ranunculus longirostris (Batrachium, Ranunculaceae) occurring in North America were studied. From the generally similar group of the rigid-leaved water crowfoots (the R. circinatus group), R. longirostris is distinguished by the presence of a long internode before the first flower (the ratio...

Floristic subdivision of the northern part of the Kuril archipelago (Russian Far East) remains controversial. Such uncertainty in biogeographical subdivision could be caused by insufficient floristic data due to poor accessibility of mainly uninhabited northern Kuril islands. We aimed to explore the flora of the largest uninhabited northern Kuril i...

Features of biomorphology of homophyllous water crowfoot Ranunculus longirostris (Batrachium, Ranunculaceae) occurring in North America are studied. From the generally similar group of the rigid-leaved water crowfoots (the R. circinatus group), R. longirostris is distinguished by the presence of a long internode before the first flower (the ratio o...

RU: На основании оригинальных исследований и литературных данных составлена характеристика 3 видов водяных лютик, шелковников (Batrachium, Ranunculaceae) – Ranunculus circinatus, R. kauffmannii, R. trichophyllus, произрастающих в водоёмах и водотоках Московской обл. Для каждого вида приведена номенклатура и синонимика, общее и региональное распрост...

Abstract: The book generalizesthe results of the integrated monitoring of the ecosystem and special studies in the Rybinsk Reservoir during the years of its existence with a particular emphasis on the period of the last 15 years. The work highlights fundamental problems of hydrobiology and ecology, and the relationships between the long-term dynami...

Potamogeton octandrus (Potamogetonaceae), a new species to the flora of Siberia, is found in Transbaikalia, in the Upper Amur basin. The water bodies, where this pondweed was found, are artificial or somehow disturbed, with a wide range of hydrochemical parameters, but the water is slightly alkaline or alkaline. The current distribution of the spec...

The long-term and seasonal dynamics of the water level in the Rybinsk Reservoir has been studied for the period of 1947—2015. The dependence of the area of overgrowing of shallow waters (S) on the water-level fluctuations (Z) has been obtained: S = 30‒45e1.054Z. The overgrowing of open shallow waters is restrained by the hydrodynamic influence on t...

Some features of the distribution of aquatic vascular plants in Asian Russia (limits of distribution and phytogeographical patterns) are discussed. Many northern species penetrate far to the south via watersheds and mountain systems, while southern species go far to the north by the valleys of large rivers. Some species considered circumpolar are r...

The long-term and seasonal dynamics of the water level in the Rybinsk Reservoir has been studied for the period of 1947–2015. The dependence of the shallow-water overgrowing area (S) on the water-level fluctuations (Z) has been obtained: S = 30‒45e1.054Z. The overgrowth of open shallow waters is restrained by the hydrodynamic influence on the litto...

The chromosome numbers (2n) for 22 populations of 8 aquatic and semi-aquatic species of the family Ranunculaceae from Magadan, Novosibirsk and Yaroslavl Regions, Yakutia and Chukotka are presented. In Magadan Region a rare cytotype of Caltha palustris (2n = 64) characteristic for Arctic and permafrost areas was found. Also in Magadan Region 2 cytot...

Isoëtes lacustris was found in Churkan Lake for the first time in Republic of Mari El, in addition to the only member of the genus I. echinospora formerly known in the region. The determination of our finding was confirmed by means of scanning electron microscopy and molecular genetic studies. Distribution of the species and issues of its protectio...

Detailed floristic investigations of the Mednyi Island added to the list of its flora both the taxa difficult for identification, mainly grasses (Agrostis exarata, A. trinii, Alopecurus glaucus, Carex eleusinoides, Hierochloe alpina, H. glabra, Poa lanata, P. paucispicula, Rumex longifolius), and aquatics difficult to collect (Callitriche hermaphro...

Hydrochemical and hydrobiological characteristics have been studied at 13 sites in the Okhta River within the precincts of St. Petersburg in 2010. The Water Pollution Index (WPI), calculated according to hydrochemical parameters, characterizes the river water quality as "very polluted" to "extremely polluted." According to the Pantle-Buck-Sládeček...

Hydrochemical and hydrobiological characteristics of 13 sites in the Okhta river within the precincts of St. Petersburg area were investigated in 2010. The Water Pollution Index (WPI), calculated according to hydrochemical parameters, characterizes the river water quality as "very polluted" to "extremely polluted". According to the Pantle—Buck—Slád...

Possible routes in which aquatic plants have spreaded across their vast ranges from ancestral areas and refugia still remain poorly known. We have chosen Eurasian yellow water-lilies (Nuphar Sm. sect. Nuphar, Nymphaeaceae) as a model group for a wide-scale phylogeographical study as they represent a common component of the continental freshwater fl...

We have found a taxonomically unclear linear-leaved Potamogeton (section Graminifolii, Potamogetonaceae) in Central Yakutia (Asian Russia). This form resembles P. friesii and P. pusillus, two common species in the republic, and the mainly European species P. rutilus and North American P. strictifolius. These species, except P. strictifolius, did no...