A5033633949- Marine Ecology and Invasive Species
- Myxozoan Parasites in Aquatic Species
- Marine Biology and Ecology Research
- Marine Invertebrate Physiology and Ecology
- Marine and coastal plant biology
- Marine Biology and Environmental Chemistry
- Aquatic Invertebrate Ecology and Behavior
- Coastal wetland ecosystem dynamics
- Parasite Biology and Host Interactions
- Cephalopods and Marine Biology
- Marine Bivalve and Aquaculture Studies
- Environmental DNA in Biodiversity Studies
- Geology and Paleoclimatology Research
- Marine Sponges and Natural Products
- Vector-borne infectious diseases
- Biocrusts and Microbial Ecology
- Isotope Analysis in Ecology
- Healthcare and Venom Research
- Allergic Rhinitis and Sensitization
- Genetics, Bioinformatics, and Biomedical Research
- Methane Hydrates and Related Phenomena
- Protist diversity and phylogeny
- Ichthyology and Marine Biology
- Nutrition, Genetics, and Disease
- Planarian Biology and Electrostimulation
St Petersburg University
2015-2024
Phylogenetic relationships and the timing of evolutionary events are essential for understanding evolution on longer time scales. Cheilostome bryozoans a group ubiquitous, species-rich, marine colonial organisms with an excellent fossil record but lack phylogenetic inferred from molecular data. We present genome-skimmed data 395 cheilostomes combine these 315 published sequences to infer key among c. 500 cheilostome species. find that named genera species phylogenetically coherent, rendering...
The phylogenomic approach has largely resolved metazoan phylogeny and improved our knowledge of animal evolution based on morphology, paleontology, embryology. Nevertheless, the placement two major lophotrochozoan phyla, Entoprocta (Kamptozoa) Ectoprocta (Bryozoa), remains highly controversial: Originally considered as a single group named Polyzoa they were separated basis morphology. So far, each new study still consistently proposed different phylogenetic positions for these groups. Here,...
Abstract Aim Quantify the contribution of environmental factors (water temperature, salinity and depth) evolutionary history to varied skeletal mineralogy in calcifying marine organisms. Location Global Ocean. Time period Present. Major taxa studied Order: Cheilostomatida; Phylum: Bryozoa. Methods We employed X‐ray diffraction (XRD) analyse mineral composition 872 individual colonies, representing 437 bryozoan species, terms calcite/aragonite ratios. integrated these data with equivalent...
Abstract The article is devoted to individual behaviour of autozooids (mainly connected with feeding and cleaning) in 40 species subspecies marine bryozoans from the White Sea Barents Sea. We present comparative descriptions observations for first time describe some autozooidal activities (e.g. cleaning colony surface by a reversal tentacular ciliature beating, variants testing-position, particle capture rejection). Non-contradictory aspects main hypotheses on bryozoan have been used create...
Bryozoans are small benthic colonial animals; their colonies consist of zooids which composed a cystid and polypide. According to morphological molecular data, three classes bryozoans recognized: Phylactolaemata, Gymnolaemata Stenolaemata. active suspension feeders feeding apparatus, the lophophore, is fringed with single row ciliated tentacles. In gymnolaemates, lophophore bell-shaped its tentacles may be equal in length (equitentacled lophophores) or some longer than others (obliquely...
Based on morphological evidence, Bryozoa together with Phoronida and Brachiopoda are traditionally combined in the group Lophophorata, although this view has been recently challenged by molecular studies. The core of concept lies presence lophophore as well nature arrangement body cavities. least known respect. Here, we focused fine structure cavity 12 bryozoan species: 6 gymnolaemates, 3 stenolaemates phylactolaemates. In complete epithelial lining is restricted to lophophore, gut walls,...
Abstract Organization and ultrastructure of the protonymphon larva were never adequately described, despite it being common larval type enigmatic sea spiders only example oligosegmented life stage among recent chelicerates. We have made a comprehensive examination newly hatched free‐living protonymphons Nymphon brevirostre using SEM, TEM, light, confocal microscopy. Although fairly typical in their broad characters, larvae number unique unexpected traits. Body cavity, already present at this...
Abstract Bryozoan colonies consist of zooids, which can differ in structure and function. Most heteromorphic zooids are unable to feed autozooids supply them with nutrients. The the tissues providing nutrient transfer is poorly investigated. Here, I present a detailed description colonial system integration (CSI) communication pores avicularia cheilosome bryozoan Terminoflustra membranaceotruncata . CSI transport distribution colony. In both it consists single cell type, that is, elongated...
Tentacles are the main food-gathering organs of bryozoans. The most common design is a hollow tube extracellular matrix (ECM), covered with ten columns epithelial cells on outside, and coelothelium inside. Nerves follow ECM, going between bases some epidermal cells. tentacle musculature includes two bundles formed by myoepithelial coelothelium. tentacles freshwater (phylactolaemate) bryozoans, however, differ somewhat in structure from those marine Here, we describe three species...
Digenea is a group of widespread parasitic flatworms with complex life cycle including successive change parthenogenetic and hermaphroditic generations. Daughter sporocysts are among the least studied parthenitae in terms ultrastructure their body wall nervous system. Here we present an ultrastructural immunocytochemical study Podocotyle sp. daughter sporocyst (Opecoelidae), parasitizing Littorina obtusata Linnaeus, 1758 from White Sea. Our results focus on structure wall, birth pore,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 348:117-124 (2007) - DOI: https://doi.org/10.3354/meps07060 Effect of habitat architecture on mobile benthic macrofauna associated with patches barnacles and ascidians Eugeniy L. Yakovis*, Anna V. Artemieva1, Mikhail Fokin2, Marina A. Varfolomeeva1, Natalia N. Shunatova1 1Invertebrate Zoology Department,...
Abstract Bryozoan colonies are composed of zooids, which can differ in structure and function. Autozooids supply heteromorphic zooids with nutrients, usually unable to feed. To date, the ultrastructure tissues providing nutrient transfer is almost unexplored. Here, we present a detailed description colonial system integration (CSI) different types pore plates Dendrobeania fruticosa . All cells CSI joined by tight junctions that isolate its lumen. The lumen not single structure, but dense...
Abstract. SEM studies of 21 species marine bryozoans demonstrated that the abfrontal side tentacles bears a row mono‐ or multiciliated cells, which are presumably sensory. In stenolaemates, as well cells at tentacle tips and laterofrontal monociliated. 17 gymnolaemate studied, each tip least 3 with tuft 5–7 stiff cilia various lengths. On surface, alternate, but all studied have base tentacle. live animals, single perform occasional flicks, whereas tufts 7–15 on immotile. Length number vary...
Abstract Bryozoans form colonies of iterated modules, termed zooids, and display varying degrees polymorphism. Polymorphic comprise autozooids (or feeding zooids) heteromorphic among which the most common types are avicularia kenozooids. Kenozooids differ in shape, size, presumed function. Among this diversity, there rhizoids, serve to attach substrate or lift them above it. To date, only general data on anatomy kenozooids at light microscopy level available. Here, we present first...
Lake Mogilnoe is a rare example of an anchialine lake (with subterranean connection to the ocean) in Arctic, refuge for landlocked populations marine organisms. The has been subject intensive studies since end 19th century. Here we demonstrate that between 2003–07 and 2015–18 observation periods this permanently stratified experienced significant changes. surface salinity increased exceeded tolerance limits many freshwater bottom anoxia expanded from one-fifth one-third volume. Such turn...