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December 2011 - present
September 1999 - present
September 1987 - present
Publications
Publications (118)
We present the first comprehensive phylogenetic study of the global fauna of the superfamily Oplophoroidea (including all 70 valid species), based on nine molecular markers and 111 morphological characters (including six multistate characters). In this study, we developed a novel approach for assessing and visualizing single- and multigene relative...
Leptochela Stimpson (1860) is a shallow-water, benthopelagic genus within the predominantly pelagic superfamily Pasiphaeoidea. We inventoried a global fauna of 17 currently valid species of Leptochela and identified a newly discovered eighteenth species. Our analysis combined both morphological and molecular data, using 13 characters (including two...
This review provides a comprehensive summary of the current knowledge on marine zooplankton diversity and distribution, highlighting key advancements and future directions in the field. While the approach used in this review is necessarily broad, focusing on overarching trends and drivers of zooplankton diversity, it emphasizes recent methodologica...
Hansarsia megalops and Thysanoessa gregaria are two abundant krill species in the warm-temperate belts in the North and South Atlantic. This pattern of disjunct distribution, often referred to as anti-tropical (or bipolar), is a regular phenomenon among marine organisms that can appear at different taxonomic levels. Analysis of spatial genetic dive...
We inventoried all nine species of the ‘Acanthephyra purpurea’ complex, one of the most abundant and cosmopolitan group of mesopelagic shrimps. We used 119 specimens at hand and genetic data for 124 specimens from GenBank and BOLD. Phylogenetic analysis of four genes (COI, 16S, NaK, and enolase) showed that the ‘Acanthephyra purpurea’ complex is po...
Cryptic and pseudocryptic species are found on all major branches of the tree of life and probably represent a significant portion of undiscovered biodiversity, yet their identification is currently possible solely on the basis of molecular analyses. Here, we tested an alternative approach and hypothesized that all genetic clades might be identifie...
A recent molecular phylogenetic and biogeographic study on the krill genus Hansarsia revealed undescribed cryptic diversity in the Atlantic. Each of four species analysed encompassed robust molecular clades that were linked to dimorphic males in H. microps, H. atlantica and H. tenella. We tested the robustness and divergence of the observed clades...
Plankton communities often consist of cosmopolitan species with an extensive gene flow between populations. Nevertheless, populations of some plankton species are genetically structured, owing to various barriers such as ocean currents, hydrological fronts, and continents. Drivers that could explain the genetic structures of most mesopelagic specie...
Hymenodora represents the most scantily studied branch of the pelagic shrimp belonging to the superfamily Oplophoroidea. We present a phylogenetic revision based on 80 morphological characters and six genes. Molecular and morphological phylogenetic analyses, along with molecular distances calculated with the use of six genes, suggest a family-level...
Aim
Climate‐driven trends in environmental processes and their effect on marine ecosystems remain poorly understood despite an obvious decrease in marine biological resources which undergo changes in stock size mediated by phyto‐ and mesoplankton. A mesoplankton multiannual dataset is one of the best tools to elucidate general trends in marine ecos...
Mesoplankton is a key element of pelagic communities representing the largest biome on the planet. Many concepts in marine and freshwater biology are based on quantitative estimates of mesoplankton abundance, whereas precision of mesoplankton sampling remains underexplored and may depend on various factors. We analyzed ten contiguous daytime epipel...
We describe and diagnose a new species of Acanthephyra (Acanthephyridae: Caridea: Decapoda) and provide an amended key to all species of the genus. In order to assess the taxonomic position of the new species, we examined and coded 55 characters in available specimens of Acanthephyra and ran morphological phylogenetic analyses. We also used a COI g...
The paper discusses advances and failures in solving the problems posed by V.I. Vernadsky 100 years ago. The quantity and quality of “living matter” along with its distribution on Earth are analyzed. In accordance with the competence of the author, the paper is focused on the most voluminous biogeochemical reservoir of the planet, i.e., the World O...
Aim
Mesoplankton distribution depends on many factors including depth, hydrological parameters, trophic conditions, etc. Recent studies show a link between mesoplankton biomass and trophic factors in the deep sea, whereas relationships between deep‐sea mesoplankton structure/composition and trophic factors remain unknown.
Location
Central Atlantic...
Factors affecting zooplankton dynamics, especially in shelf-sea ecosystems such as the Black Sea influenced by eutrophication, overfishing, climate variability, and biological invaders, merit special attention for successful development and management. We used coherence functions (phase angle) to analyze time series (918 samples collected every 10...
Aim
Mesoplankton of the Southern Ocean is the key trophic link between phytoplankton and other consumers and an important part of the biological carbon pump, a critical component of climate regulation. Although general patterns of mesoplankton distribution and life cycles are known, we still cannot estimate mesoplankton standing stocks at specified...
The deep sea is the largest biome on Earth and hosts the majority of as yet undescribed species; description of these may trigger a new mindset about evolution and function of characters. We describe and diagnose a new genus and species Sclerodora crosnieri sp. nov. belonging to the superfamily Oplophoroidea. We examined and coded 81 characters for...
Benthesicymidae is a monophyletic group of Decapoda adapted to a life on the sea-floor, in the near-bottom layer, in the bathy- and in the mesopelagic, within an impressive depth range from a few hundred metres (Gennadas) to several thousand metres (Benthesicymus). Higher taxa are known to conquer all main oceanic biotopes such as the benthic, bent...
North Atlantic zooplankton communities vary in terms of abundance, biomass and species composition depending on various environmental factors. In this study we analyzed the influence of hydrological factors (water temperature, salinity and density) on mesoplankton and retrieve boundaries between mesoplankton assemblages across the Subpolar North At...
Evolutionary mechanisms driving the diversification of pelagic animals remain poorly understood, partly due to the high levels of gene flow in the open ocean. We use molecular phylogenetics, morphological, and phylogeographic approaches to test the allopatric speciation model in respect to the Atlantic krill genus Nematoscelis. Based on our observa...
Spatial distribution of zooplankton communities depends on numerous factors, especially temperature and salinity conditions (hydrological factor), sampled depth, chlorophyll concentration, and diel cycle. We analyzed and compared the impact of these factors on mesoplankton abundance, biodiversity, quantitative structure based on proportion of taxa...
Evolutionary mechanisms driving the diversification of pelagic animals remain poorly understood, partly due to the high levels of gene flow in the open ocean. We use molecular phylogenetics, morphological, and phylogeographic approaches to test the allopatric speciation model in respect to the Atlantic krill genus Nematoscelis. Based on our observa...
The shrimp genera Ephyrina, Meningodora and Notostomus have an unusual carapace strengthened with carinae and a half-serrated mandible, which may suggest a possible monophyly of this group. Here we test this hypothesis and present the first phylogenetic study of these genera based on 95 morphological characters (all valid species coded) and six mol...
Diel and seasonal vertical migrations of zooplankton represent a widespread phenomenon occurring in marine and freshwater environments. Diel migrations are panoceanic, while seasonal migrations usually occur in temperate and polar areas. This paper describes differences in the diel and seasonal vertical migrations in the Drake Passage north and sou...
A phylogenetic study of deep-sea dendrobranchiate genera Altelatipes, Benthesicymus and Benthonectes based on four molecular markers and 91 morphological characters is presented. All currently recognized species of these genera, representatives of all other genera and species groups of Benthesicymidae, and three outgroups were included in the analy...
The phylogenetic study of the deep-sea genus Bentheogennema is based on four molecular markers and 79 morphological characters. All four previously recognized species and two new species of Bentheogennema, representatives of all other genera and species groups of Benthesicymidae, and three outgroups were included in the analyses. We have examined a...
Supplementary to the article: Zooplankton communities in the Drake Passage through environmental boundaries: a snapshot of 2010, early spring.
Abundance and biomass of zooplankton at stations
Abundances are expressed in number of individuals per cubic meter; biomass values are in gramm of wet weight per cubic meter.
Background
Spatial distribution of zooplankton communities influenced by various environmental factors is always important for understanding pelagic ecosystems. The area of the Drake Passage (Southern Ocean) is of particular interest owing to the high spatial and temporal variability of hydrological parameters affecting marine fauna. This study pro...
Background
The development and management of shelf-sea ecosystems require a holistic understanding of the factors that influence the zooplankton structure and ecosystem functions. The Black Sea is an example of such areas influenced by eutrophication, overfishing, climate variability, invasions of the ctenophores Mnemiopsis leidyi followed by Beroe...
The genus Hemimysis (Malacostraca: Mysida: Mysidae) encompasses near-bottom, demersal and cave-dwelling mysids living in the marine, brackish and freshwater habitats around the European coast, from the Caspian Sea to the Scandinavian Peninsula. We conducted cladistic analysis of 52 morphological characters of all nine species and three subspecies o...
The first comprehensive phylogenetic study of the family Oplophoridae is based on four molecular markers and 87 morphological characters. We have examined and coded five major groups of morphological characters related to the rostrum (nine characters), the carapace (10), the abdomen and telson (34), the exopods (eight) and the armature of the poste...
We assess the biomass of deep-pelagic shrimps in the Atlantic Ocean using data collected between 40°N and 40°S. Forty-eight stations were sampled in discrete-depth fashion, including epi- (0–200 m), meso- (200–800/1000 m), upper bathy- (800/1000–1500 m), and lower bathypelagic (1500–3000 m) strata. We compared samples collected from the same area o...
The Southern Ocean is a crucial component of the global climate system and plankton communities inhabiting the Ocean are important in the global carbon cycle. Our paper is aimed to reveal possible factors, which keep identity and explain changes of the community structure at the mesoscale. We tested the absolute values of environmental variables (e...
The first comprehensive phylogenetic study of Euphausiacea (all 86 valid species) is presented. It is based on four molecular markers and 168 morphological characters (including 58 characters of the petasma). Phylogenetic analyses support the monophyly and robustness of the families Bentheuphausidae and Euphausiidae and reveal three major clades fo...
Species within Gennadas differ from each other largely only in male (petasma) and female (thelycum) copulatory characters, which were restudied in scanning electron microscopy and used as a basis for phylogenetic analyses. Twenty-six petasma characters and 49 thelycum characters were identified. All 16 recognized species of Gennadas and Aristaeomor...
The phylogenetic analysis of Sergestoidea based on 253 morphological characters and encompassing all 99 valid species confirmed all previously recognized genus-level clades. Analysis retrieved five major robust clades that correspond to families Luciferidae, Sergestidae, Acetidae fam.n., Sicyonellidae fam.n. and Petalidiumidae fam.n. Synonymy, emen...
Nocturnal sampling of mesoplankton above different biotopes at depths of 10, 20, and 40 m, with a temporal resolution of 10 min (98 hauls) was made and 76 taxa were identified. Six environmental factors were tested as the proximate cues for the distribution of individual taxa and integral community parameters: type of sea-floor biotope/depth (SFB),...
We have developed a global biogeographic classification of the mesopelagic zone to reflect the regional scales over which the ocean interior varies in terms of biodiversity and function. An integrated approach was necessary, as global gaps in information and variable sampling methods preclude strictly statistical approaches. A panel combining exper...
Plankton fauna nocturnally migrating from the sea-floor or near-bottom layer to the uppermost surface layer (benthoneuston) links benthic, benthopelagic, pelagic, and neustonic realms. We conducted five intervals of sampling (every 1–2 hours during five nights) synchronously in the neustal (surface to 10-cm depth layer) and in the water column belo...
In a changing ocean there is a critical need to understand global
biogeochemical cycling, particularly regarding carbon. We have made strides
in understanding upper ocean dynamics, but the deep ocean interior
(> 1000 m) is still largely unknown, despite representing the
overwhelming majority of Earth's biosphere. Here we present a method for
estima...
Luciferidae is a family of peculiar and widely distributed shrimps with an unclear systematic position and uncertain internal phylogeny. We undertook a phylogenetic analysis of Luciferidae based on 169 morphological characters (147 binary, 22 multistate). Several characters were based on scanning electron microscopy studies of the reproductive orga...
Despite their role in marine systems, Sergestidae remain one of the most poorly understood families amongst planktonic shrimps with regard to phylogeny. Recent morphological and phylogenetic revisions of a number of sergestid genera have disentangled classificatory problems and emphasized the importance of reproductive structures for the taxonomy a...
Despite their role in marine systems, Sergestidae remain one of the most poorly understood families amongst planktonic shrimps with regard to phylogeny. Recent morphological and phylogenetic revisions of a number of sergestid genera have disentangled classificatory problems and emphasized the importance of reproductive structures for the taxonomy a...
In a changing ocean there is a critical need to understand global biogeochemical cycling, particularly regarding carbon. We have made strides in understanding upper ocean dynamics, but the deep ocean interior (> 1000 m) is still largely unknown, despite representing the overwhelming majority of Earth's biosphere. Here we present a method for estima...
The paper addresses the phylogeny and classification of the hydrothermal vent shrimp family Alvinocarididae. Two morphological cladistic analyses were carried out, which use all 31 recognized species of Alvinocarididae as terminal taxa. As outgroups, two species were included, both representing major caridean clades: Acanthephyra purpurea (Acanthep...
Petalidium (Decapoda: Dendrobranchiata: Sergestidae) is one of the least known genera of pelagic decapods. On the basis of collections taken during Dana Expedition 1920–22 and 1928–30, we revise the morphology of the genus. To understand the taxonomic status and position of Petalidium within other sergestid genera, we used 150 morphological charact...
Research results and prospects on the evolution of the oceanic biosphere are discussed. Objectives
are formulated for the study of evolution at the levels of genes, organisms, and systems. The possibilities of
the metagenomic, phylogenetic, and ecosystem approaches are outlined. A concept of the evolution of
marine ecosystems is proposed. Ecosystem...
We revise the global diversity of the former genera Sergia and Sergestes which include 71 valid species. The revision is based on examination of more than 37,000 specimens from collections in the Natural History Museum of Denmark and the Museum of Natural History, Paris. We used 72 morphological characters (61 binary, 11 multistate) and Sicyonella...
At a shallow (7 m) near-shore sampling site in the Black Sea we analyzed composition, abundance, and biomass of benthopelagic organisms and the contribution these animals make to the total plankton. The site was monitored across several years (1996-2001; 2006-2007) whilst for 1999-2000 the seasonal variations were analysed. A total of 321 samples f...
The aim of this study is to review of our knowledge about distribution of recently known species of vent shrimps and to analyze factors influencing distribution patterns. Analyses are based upon (1) original material taken during eight cruises in the Atlantic Ocean (a total of 5861 individuals) and (2) available literature data from the Atlantic, P...
A mesoscale grid survey of the epipelagic mesozooplankton of Drake Passage during Antarctic spring, 2008, is evaluated. The station grid comprised six parallel frontal transects between 57° and 60° S in the vicinity of the Polar Front, the distance between transects being 18 km. Several parameters were analysed: total zooplankton biomass, biomass o...
Nanobiota plays a key role in biological and biogeochemical processes in the World Ocean, but our current knowledge about nanobiota is restricted by the traditional methods of data collecting and processing. The use of new molecular methods can significantly enrich our concepts of biological processes in the ocean. Proceeding from the modern concep...
Our knowledge about the microorganisms living in the high Arctic Ocean is still rudimentary compared to other oceans mostly because of logistical challenges imposed by its inhospitable climate and the presence of a multi-year ice cap. We have used 18S rRNA gene libraries to study the diversity of microbial eukaryotes in the upper part of the water...
Opaepele vavilovi sp. nov., family Alvinocarididae, is described from the Broken Spur vent site (26o 09'N, 44o50'W) on the Mid-Atlantic Ridge. An emended diagnosis for Opaepele is provided, along with characters distinguishing new species from other species of the genus. All known vent species of Alvinocarididae from the Mid-Atlantic Ridge are list...
Opaepele vavilovi sp. nov., family Alvinocarididae, is described from the Broken Spur vent site (26 o 09'N, 44 o 50'W) on the Mid-Atlantic Ridge. An emended diagnosis for Opaepele is provided, along with characters distinguishing new species from other species of the genus. All known vent species of Alvinocarididae from the Mid-Atlantic Ridge are l...
Extensive Danish collections of sergestid shrimp
taken during the “Dana I” (1920-22), “Dana II”
(1928-30) and “Galathea” (1950-52) Expeditions
have been examined. These 1409 examined samples
comprise a total of 20,544 specimens: 9,022 males
and 11,522 females. All the 29 hitherto known valid
species plus 6 new species (Sergestes antarcticus, S.
mep...
Molecular rRNA gene surveys reveal a considerable diversity of microbial eukaryotes in different environments. Even within a single clade, the number of distinct phylotypes retrieved often goes beyond previous expectations. Here, we have used specific 18S rRNA PCR primers to investigate the diversity of diplonemids, a poorly known group of flagella...
Seven specimens of a benthesicymid shrimp belonging to a new genus and a new species, Altelatipes falkenhaugae n. gen., n. sp., were obtained by fishing with a pelagic trawl on the northern Mid-Atlantic Ridge, down to a depth of 2300 m. Altelatipes n. gen. is very close to Benthesicymus and is distinguished by having a dorsal carina on the third ab...
Copepod composition, abundance and distribution were studied in June 2004 on the Mid-Atlantic Ridge, along a transect extending from Iceland (60°N) to the Azores (41°N). The samples were depth-stratified from the surface down to a maximum depth of 2500m. The transect covered relatively warm and relatively saline Modified North Atlantic Water (MNAW)...
Altelatipes falkenhaugae n. gen., n. sp. (Crustacea, Decapoda, Benthesicymidae)
from the northern Mid-Atlantic Ridge.
Seven specimens of a benthesicymid shrimp belonging to a new genus and a
new species, Altelatipes falkenhaugae n. gen., n. sp., were obtained by fi shing
with a pelagic trawl on the northern Mid-Atlantic Ridge, down to a depth of
23...
Lost City is a unique off-axis hydrothermal vent field characterized by highly alkaline and relatively low-temperature fluids that harbours huge carbonate chimneys. We have carried out a molecular survey based on 18S rDNA sequences of the eukaryotic communities associated with fluid-seawater interfaces and with carbonates from venting areas and the...
Three dives of Mir manned submersibles with plankton counts and two vertical plankton hauls with a BR net were carried out above the Lost City
(Atlantis underwater massif) and the Broken Spur hydrothermal fields during cruise 50 of R/V Akademik Mstislav Keldysh. Above the Atlantis seamount, no significant increase in the plankton concentration was...
Two new species of Munida (M.
gordoni and M.
grieveae) and one new species of Agononida
(A.
nielbrucei) are described from volcanic seamounts off northern New Zealand (RV ‘Tangaroa’, National Institute of Water and Atmospheric Research [NIWA], New Zealand). Description of new species and preliminary examination of NIWA collections reveal unusually...
Plankton аbоvе the hydrolhermal fields оf the Mid-Atlantic Ridge were studied оveг the waler column wilh Ihe use of " MiI" deep-sea manned submersibles and BR planklon nets. The studies were accompanied bу detailed hydrological observations in the water column. In the summeг 2002, six vent fields wеге explored: Snake Pit (23 N), TAG (26 N), Broken...
The vertica! zoop!ankton distribution at the northeastem periphery of the North At!antic subtropical gyre was studied with the use of 113/140 BR nets and Mir manned submersibles. The vertical distribution of se!ected dominant taxonomic, eco!ogical, and trophic groups is considered. The results were compared with the data obtained at the same !ocati...
The results of the underwater observations done bу the author in September 2001 аге ргеsented. Dives at depths of 0-20 m were made in the Golubaya Вау; in addition, dives in the layer 0-20 m weIe made in cruises of R/V "Ashamba" above depths of 10-1000 m off of the Golubaya Вау. Diel vertical migrations of the ctenophores Вегое ovata were discovere...
During the summer and fаll (from June to November) of 2001, the ctenophores Mnemiopsis and Beroe including their larvae (аll the animals smaller than two millimeters) were collected in The Golubaja Вау (near Gelendzhik) practically every day. In addition, the material was regularly collected over the five-rnile transects from the Golubaya Вау to th...
The results of underwater observations made bу the author in Ihe first half of August 2000 аге presenled. The dives were carried out nеаг the Golubaya Вау аt depths оf 0-20m and during а cruise оf R/V "Kvant" within the 0-20 m lауег above depths of 20-120 m off the Golubaya Вау. Two medusa species (Aurelia aurita and Rhizostoma pulmo and the ctenop...
Vertical distribution of meso- and macroplankton at the north (36°14′ N) and south (14°45′ N, 15°10′ N) periphery of the North Atlantic gyre was considered. The plankton was studied in the net samples (BR 113/140) and by direct visual count from deep-sea manned vessel Mir during five descents. In addition, benthopelagic animals were collected with...
The carbon and nitrogen isotopic composition of 18 faunistic groups collected during the 39th cruise of the R.V. “Akademik
Mstislav Keldysh” in September 1996 at the Broken Spur vent field, MAR, was studied. The trophic structure of the Broken Spur
vent community is considered. All age stages of the shrimp Rimicaris exoculata living 5 m below the...
Extensive Danish collections of sergestid shrimp taken during the "Dana I" (1920-22), "Dana 11" (1928-30), and "Galathea" (1950-52) Expeditions have been examined. These samples comprise a total of 7,910 specimens: 4,497 females, 3,018 males and 395 juveniles. Additional material (244 specimens) from Dr. Th. Mortensen's expeditions, "Atlantide", "T...
Vertical distribution of meso- and macroplankton at the north (36 14' N) and south (14 45' N,
15 10' N) periphery of the North Atlantic gyre was considered. The plankton was studied by the net samples
(BR 113/140) and bу direct visual counting from deep-sea manned vessel "Mir" during five dives. In addition,
benthopelagic animals were collected wit...
Visual observations were made in September 1997 during the 39 cruise of R/V “Akademik Mstislav Keldysh” with 2 deep-sea manned submersibles “Mir” aboard. During 4 dives the following plankton countings were made: 3 vertical throughout the water column during the day, 2 vertical in the upper 1000m at night, and 1 oblique in the plume area during the...
Vertical distribution of meso- and macroplankton was studied in the region of the most sharply ргоnounced climatic frontal zone between the Gulf Stream and the Labrador Сurrent оvег the surveyed агеа with the center at 41 °39' N and 49°58' W. The hauls with а plankton net BR 113/140 and visual counts of maсroplankton from the Mir submersible were u...
Six sites of hydrothermal activity with associated specialized fauna have been studied, lying between 14°45′ and 37°51′N along the Mid-Atlantic Ridge (MAR). To date about 100 species have been recorded, but the number increases with each expedition. There are common patterns in the distribution of the animals. The community organization usually cha...
Four populations (a total of 677 specimens) of the hydrothermal shrimp species Rimicaris exoculata from three Mid-Atlantic Ridge vent fields were studied: Broken Spur (29°N), TAG (26°N), and “14–45” (14°N). Five morphological characters were analysed: number of dorsolateral spines on telson, telative carapace width, relative abdominal length, prese...
Studies of vertical zooplankton distribution in the water соlumn оvег the Broken Spur hydrothermal field located in ап ultraoligotrophic region of the Atlantic Осеаn, carried out both with traditional gear (big bottles, plankton nets) аnd via direct оbsегvаtiоns from the "Mir" submersibles, did not reveal аnу influence of the hydrotherms оn the com...
Mirocaris keldyshi gen. nov., sp. nov. is described from the Mid-Atlantic Ridge, TAG Location (26°09′N 44°50′W). The family Mirocarididae is proposed to include the new genus. The taxonomic position and distinguishing characters (presence of hook-bearing thoracic epipods and rudimentary appendix interna on pleopods 2–4) of the new family as compare...
A new family and superfamilya re proposedf or Galatheacaris abyssalis, new genus, new species, found in a deep-water sample of the Galathea collections.The new superfamily is characterized by a pectinate sinus betweent he mandibular processes, an articulated palp on the first and second maxillae, the third maxilliped with 7 segments, the dactyli of...
Iorania concordia gen. nov., sp. nov. (Crustacea: Decapoda) belonging to the family Alvinocarididae is described from the Mid Atlantic Ridge, TAG location (26°09'N 44°50'W). The taxonomic position in the family and distinguishing characters (rostrum, armature of telson, form of first maxilliped) of the new genus are presented, and a possible evolut...
The distribution of abundance and biomass and the age structures of the populations of benthopelagic shrimps were studied over seamounts and continental slopes in the Western Indian Ocean. The results are based оn 39 horizontal and 15 nеаг-bottom trawl samples collected 30-1000 m аbоуе the seafloor, and оn 30 pairs of net samples taken with а Zvuk-...
