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274 results for “baltic sea”
Effects of hypoxia and spawning on mitochondrial metabolism and bioenergetics of the blue mussel Mytilus spp. from the Baltic Sea
<p>We studied the effect of short-term hypoxia (7 days) and spawning (pre-spawning, and 3 h and 72 h post-spawning) on mitochondrial respiration, reactive oxygen species (ROS) production, and energy budget of the mussels Mytilus edulis. The data set reports oxygen consumption, efflux of reactive oxygen species (H2O2), fractional electrol leak (ratio of H2O2 efflux to O2 consumption) in isolated mitochondria, as well as the biochemical composition and energy content of the gills and the digestive gland tissues, tissue energy demand (measured as the activity to the electron transport system) and cellular energy allogation (CEA) in the tissues of the mussels.</p>
Near-bottom Oxygen observations from Western Baltic Sea
<p>The provided dataset includes the near-bottom oxygen observations (NBO) from the western Baltic Sea (8.5-16°E and 53.67-57.5°N) and is presented in detail by Friedland, Vock, Piehl (2023, https://www.mdpi.com/2073-4441/15/18/3235).</p> <p>The provided data consists of a couple of individual dataset from several freely usable sources: IOW measurement database, ICES Dataset of Hydrography, Boknis Eck time series, EU Copernicus Marine Data Store and the databases of the Mecklenburg Western Pomerania state office for Environment, Conservation and Geology (LUNG-MV) and the Schleswig-Holstein state office for the Environment (LfU-SH) respectively. From the different databases, we extracted the measured dissolved oxygen concentrations (or the measured oxygen saturation, which was converted following Weiss (1970)), location (longitude, latitude, water depth) and depth of the measurement. Aiming to unify the data in the joint dataset, the different datasets were transformed to mg/l, duplicates were removed and measurements at the same time and location obtained by different methods were averaged. Due to many inconsistencies between the measurement depth and bathymetric depth as well as large variations in the measured bathymetric depth of the respective measuring stations, the measured bathymetric depth given in the datasets was replaced by the bathymetric depth retrieved from iowtopo and EMODnet Bathymetry. The datasets mentioned above, included measurements of dissolved oxygen from the whole water column. To sort out the NBO, the deepest measurement was used, if it was close enough to the bottom using as threshold: for water depths below 16m, measurements within the lower 25% of the water column and for water depths above 16m measurements from a maximum of 4 meters above the sea floor were selected.</p>
Bulk Carbon and Amino Acid nitrogen isotope data from Baltic cod (Gadus morhua) and European flounder (Platichthys flesus) muscle tissue samples from the western and central Baltic Sea
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Data for: High focus on threatened species and habitats may undermine biodiversity conservation: evidence from the northern Baltic Sea
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Data from: Adaptation potential of the copepod Eurytemora affinis to a future warmer Baltic Sea
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Baltic Sea stable isotope ecology meta-data collection
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Data from: Oceanographic connectivity and environmental correlates of genetic structuring in Atlantic herring in the Baltic Sea
Marine fish often show little genetic structuring in neutral marker genes, and Atlantic herring (Clupea harengus) in the Baltic Sea are no exception; historically, very low levels of population differentiation (FST ≈ 0.002) have been found, despite a high degree of interpopulation environmental heterogeneity in salinity and temperature. Recent exome sequencing and SNP studies have however shown that many loci are under selection in this system. Here, we combined population genetic analyses of a large number of transcriptome-derived microsatellite markers with oceanographic modelling to investigate genetic differentiation and connectivity in Atlantic herring at a relatively fine scale within the Baltic Sea. We found evidence for weak but robust and significant genetic structuring (FST = 0.008) explainable by oceanographic connectivity. Genetic differentiation was also associated with site differences in temperature and salinity, with the result driven by the locus Her14 which appears to be under directional selection (FST = 0.08). The results show that Baltic herring are genetically structured within the Baltic Sea, and highlight the role of oceanography and environmental factors in explaining this structuring. The results also have implications for the management of herring fisheries, the most economically important fishery in the Baltic Sea, suggesting that the current fisheries management units may be in need of revision.
Data from: Echinorhynchus salmonis Müller, 1784 (Acanthocephala: Echinorhynchidae) from the Bothnian Bay, Baltic Sea: morphological variability and radial asymmetry of proboscis hooks
Echinorhynchus salmonis is a common parasite of salmoniform and other fishes, occurring in fresh and brackish waters throughout the Holarctic. Presented here is the first analysis of the morphometric and meristic variation in a Palaearctic population of E. salmonis, collected from whitefish Coregonus lavaretus L. and smelt Osmerus eperlaus (L.) from the Bothnian Bay, northern Baltic Sea. Morphological data were compared with published descriptions of congeneric taxa. Nearctic populations of salmonid echinorhynchids considered by some to represent a distinct species, E. coregoni Linkins in Van Cleave, 1919, did not show any morphological divergence from Palaearctic populations, indicating that the name E. coregoni should be suppressed. Similarly, E. alpinus Linstow, 1901 has been considered to be a junior synonym of E. salmonis. However, E. alpinus should be regarded as a valid species, because it has a longer and more elongate body. The armature of the acanthocephalan proboscis typically displays radial symmetry. However, in E. salmonis the hooks on the dorsal surface of the proboscis are smaller than those on the ventral surface. Size differences between dorsal and ventral hooks are most pronounced at the base of the proboscis. The systematic and functional significance of radial asymmetry of proboscis hooks is discussed.
Diversity and ecology of aphyllophoroid fungi on driftwood logs on the shores of the Baltic Sea
Driftwood is woody debris that is floating on the sea or brought onto the shore by the sea. It can have a natural origin but often it originates from human activities. Driftwood has a significant ecological role as a microhabitat for a large range of species. Dead-wood-associated aphyllophoroid fungi on driftwood have been studied rather little globally, and there are hardly any studies conducted in the Baltic Sea. We studied the diversity and ecology of polypores and corticioids growing on driftwood (man-made logs) on the shores of Finnish SW-archipelago. In total, 394 driftwood logs were surveyed for visible fungal sporocarps. We found altogether 145 species (1023 records) of which approximately three-fourths were corticioids. The driftwood logs hosted several rare and noteworthy species, such as one new corticioid species, 16 nationally rare species, and 40 new species to the region. The five most common species accounted for one-third of all observations, whereas 82 species (11 % of all records) were recorded only once or twice. Larger logs hosted, on average, more species compared to small-diameter logs. The mean number of species increased significantly when comparing the logs in the first and the middle stages of decay. Our results show that driftwood logs can host a wide variety of species and they provide an important substrate for many dead-wood-associated fungi, including species of conservation concern and species with restricted ecological requirements. Driftwood hosted several species that have not been previously found in the archipelago forests, and the logs clearly enrich the fungal diversity in the area. Our results encourage to increase dead wood for fungi in coastal forests where it has been dramatically decreased as a result of strong hemeroby.
Data from: Divergence within and among seaweed siblings (Fucus vesiculosus and F. radicans) in the Baltic Sea
Closely related taxa provide significant case studies for understanding evolution of new species but may simultaneously challenge species identification and definition. In the Baltic Sea, two dominant and perennial brown algae share a very recent ancestry. Fucus vesiculosus invaded this recently formed postglacial sea 8000 years ago and shortly thereafter Fucus radicans diverged from this lineage as an endemic species. In the Baltic Sea both species reproduce sexually but also recruit fully fertile new individuals by asexual fragmentation. Earlier studies have shown local differences in morphology and genetics between the two taxa in the northern and western Bothnian Sea, and around the island of Saaremaa in Estonia, but geographic patterns seem in conflict with a single origin of F. radicans. To investigate the relationship between northern and Estonian distributions, we analysed the genetic variation using 9 microsatellite loci in populations from eastern Bothnian Sea, Archipelago Sea and the Gulf of Finland. These populations are located in between earlier studied populations. However, instead of bridging the disparate genetic gap between N-W Bothnian Sea and Estonia, as expected from a simple isolation-by-distance model, the new populations substantially increased overall genetic diversity and showed to be strongly divergent from the two earlier analysed regions, showing signs of additional distinct populations. Contrasting earlier findings of increased asexual recruitment in low salinity in the Bothnian Sea, we found high levels of sexual reproduction in some of the Gulf of Finland populations that inhabit extremely low salinity. The new data generated in this study supports the earlier conclusion of two reproductively isolated but very closely related species. However, the new results also add considerable genetic and morphological complexity within species. This makes species separation at geographic scales more demanding and suggests a need for more comprehensive approaches to further disentangle the intriguing relationship and history of the Baltic Sea fucoids.
Data from: Testing the devil's impact on southern Baltic and North Sea basin whitefish (Coregonus spp.) diversity
Background: The diversity and phylogeny of whitefish of the genus Coregonus is complex, and includes many endemic species of high conservation concern. However, because of commercial importance of whitefish fisheries, stockings and translocations have occurred repeatedly, which challenges the identification of local populations as conservation units. This study analyses the phylogenetic relationships of 15 contemporary and two historical populations of lake-resident and anadromous whitefish (Coregonus spp.) from the southern Baltic and North Sea basins. We elucidated the complex history of Lake Schaal (northern Germany) whitefish, for which a local tale suggests that the devil threw whitefish from the Central European Lake Constance into this lake. Studies from the early 20th century indeed suggested numerous stocking events for Lake Schaal from Lake Constance, from Estonian/Russian Lake Peipsi and from the anadromous whitefish of the Baltic Sea. Results: Analyses of 13 microsatellite markers showed that Lake Constance whitefish are unrelated to any northern Germany whitefish population, including the contemporary whitefish population from Lake Schaal. Comparison with four historical specimens further showed that the native Lake Schaal whitefish (C. holsatus) vanished from the lake, but has survived as a non-native population in the north German Lake Drewitz. The whitefish currently occurring in Lake Schaal and three adjacent lakes are identified as C. maraenoides, introduced from Lake Peipsi. The contemporary anadromous whitefish populations from the Baltic (German and Finnish coast) and the German River Treene (North Sea basin, stocked from Danish River Vida) grouped together, but showed significant genetic differentiation. The 14 historical specimens of C. oxyrinchus from Rivers Rhine and Schelde were assigned to several contemporary whitefish populations, but among them only one specimen was assigned to the contemporary River Treene population. Therefore, we do not support the view that the whitefish from River Vida/Treene are identical with the historical C. oxyrinchus. Conclusions: Our study demonstrates that lake and anadromous whitefish in the Baltic and North Sea basins reflect a complex phylogeography, which is further blurred by the effects of repeated stocking and translocations. To identify conservation units, the genetic identity of each population has to be scrutinized.
Data from: Oxygen and carbon isoscapes for the Baltic Sea: testing their applicability in fish migration studies
Conventional tags applied to individuals have been used to investigate animal movement, but these methods require tagged individuals be recaptured. Maps of regional isotopic variability known as "isoscapes" offer potential for various applications in migration research without tagging wherein isotope values of tissues are compared to environmental isotope values. In this study, we present the spatial variability in oxygen (math formula) and dissolved inorganic carbon (δ13CDIC) isotope values of Baltic Sea water. We also provide an example of how these isoscapes can reveal locations of individual animal via spatial probability surface maps, using the high-resolution salmon otolith isotope data from salmon during their sea-feeding phase in the Baltic Sea. A clear latitudinal and vertical gradient was found for both math formula and δ13CDIC values. The difference between summer and winter in the Baltic Sea math formula values was only slight, whereas δ13CDIC values exhibited substantial seasonal variability related to algal productivity. Salmon otolith δ18Ooto and δ13Coto values showed clear differences between feeding areas and seasons. Our example demonstrates that dual isotope approach offers great potential for estimating probable fish habitats once issues in model parameterization have been resolved.
FIGURE 2 in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 2. Heterolepidoderma sinus spec. nov. Schematic drawing. The cross section of the trunk region.
FIGURE 8 in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 8. Aspidiophorus lamellophorus Balsamo, Hummon, Todaro et Tongiorgi, 1997.—Adult specimen. A—Ventral body view, B—Internal body view, C—Ventral body view.
FIGURE 4. Heterolepidoderma sinus spec. nov.—Holotype. A in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 4. Heterolepidoderma sinus spec. nov.—Holotype. A—Ventral body view, B—Internal body view, C—Ventral body view.
FIGURE 1. Heterolepidoderma sinus spec. nov. Schematic drawings. A in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 1. Heterolepidoderma sinus spec. nov. Schematic drawings. A—Dorsal body view, B—Internal body view, C— Ventral body view. Light grey areas indicate the ciliary bands and patches.
FIGURE 6. Heterolepidoderma sinus spec. nov. A in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 6. Heterolepidoderma sinus spec. nov. A—Dorsal view of posterior body end, B—Pharynx with cuticular reinforcements.
FIGURE 5. Heterolepidoderma sinus spec. nov.—Juvenile specimen. A in Baltic Sea Gastrotricha—one new species and one new record of Chaetonotida from Poland
FIGURE 5. Heterolepidoderma sinus spec. nov.—Juvenile specimen. A—Ventral body view, B—Internal body view, C— Ventral body view.
FIGURE 13. Turbanella hyalina Schultze, 1853. A in Checklist of Gastrotricha of the Polish Baltic Sea with the first reports of Heterolepidoderma joermungandri Kånneby, 2011, and Turbanella hyalina Schultze, 1853
FIGURE 13. Turbanella hyalina Schultze, 1853. A—Anterior adhesive tubes, B—Lateral adhesive tubes, C—Dorso-lateral adhesive tubes, D—Dorsal view of caudum, E—Internal view of caudum, F—Ventral view of caudum.
FIGURE 10 in Checklist of Gastrotricha of the Polish Baltic Sea with the first reports of Heterolepidoderma joermungandri Kånneby, 2011, and Turbanella hyalina Schultze, 1853
FIGURE 10. Heterolepidoderma joermungandri Kånneby, 2011. A—Dorsal view of scales in head region, B—Dorsal view of scales in posterior trunk region and in furcal base, C—Pharynx with cuticular reinforcements, D—Dorsal view of scales in trunk region, E—Ventral view of scales of interciliary field.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.