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  • Other Sources  (13)
  • De Gruyter
  • Leningrad : Gidrometeoizdat
  • Molecular Diversity Preservation International
  • 1
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    Satellite Geodesy - Foundations, Methods, and Applications (1993)
    De Gruyter
    In:  Berlin, 531 pp., De Gruyter, vol. 18, no. Publ. No. 12, pp. 9, (ISBN 0-521-35367-X, ISBN 0-521-79836-1 paper)
    Details
    Publication Date: 1993
    Keywords: Textbook of geodesy ; Geodesy ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Satellite Laser Ranging ; Global Positioning System
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Feeding activity and diet composition of round goby (Neogobius melanostomus) in the coastal waters of SE Baltic Sea (2015)
    De Gruyter
    In:  Oceanological and Hydrobiological Studies, 44 (4). pp. 508-519.
    Details
    Publication Date: 2020-06-18
    Description: Feeding activity and diet composition of round goby were investigated in the south-eastern Baltic Sea, the Lithuanian coastal waters during May-October 2012 in order to determine main feeding objects and seasonal periods when native fauna could be most affected by predation of this highly invasive species. In total, prey represented by 18 taxa was found in the gut contents of dissected fish. Feeding activity of round goby varied depending on the body size, sex and stage of the reproduction period. The gut contents of 〈 50 mm specimens were dominated by zooplanktonic and meiobenthic organisms, whereas larger individuals (50–99 mm) shifted to amphipods and mollusks. Individuals of the intermediate 100-200 mm length had a variable diet, changing depending on the season; in spring they mostly preyed on Macoma balthica, in summer − on polychaetes, while in autumn the contribution of Mytilus trossulus and fish considerably increased in their diet. Diet composition of individuals ≥ 200 mm was relatively constant in the course of the study with substantial preference to M. balthica. These findings imply that benthic fauna, particularly a newly settled generation of epibenthic mollusks in autumn is under strong predatory pressure of the round goby.
    Type: Article , PeerReviewed
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  • 3
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    Impact of the azores front propagation on deep ocean particle flux (2012)
    De Gruyter
    In:  Open Geosciences, 4 (4). pp. 531-544.
    Details
    Publication Date: 2020-06-15
    Description: The Azores Current originating as a branch of the Gulf Stream is a highly dynamic system in the subtropical North Atlantic. The associated front forms the northeastern boundary of the North Atlantic Subtropical Gyre. In this study we analyzed 42 years of assimilated modeled temperature fields to localize the position of the Azores Front at 22°W and observed a fast north- and southward propagation between 30°N and 37°N on monthly to decadal time scales. The North Atlantic Oscillation with correlated changes of the wind direction was identified as one driving mechanism. As the front is acting as a guide for Rossby waves, the signal of the front’s propagation is transferred to the western Atlantic and, among other atmospheric forcing mechanisms, induces a shifting of the Northern Wall of the Gulf Stream with one year delay. Shallower mixed layer depths in the northern frontal region of the Azores Current caused by the rise of the isotherms lead to nutrient supply and primary production different from those found in the southern frontal region of the current system. A high interannual variability is manifested in deep ocean particle flux, derived from a sediment trap in 2000 m water depth at the mooring site KIEL276 (33°N, 22°W) from 1993 to 2008, which is directly related to the phytoplankton bloom in the euphotic zone. This variability is explained by the propagation of the front and strong variations in the catchment areas of the sediment trap due to the associated eddy activity in the frontal region.
    Type: Article , PeerReviewed
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  • 4
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    Methane seeps in a changing climate (2017)
    De Gruyter
    In:  In: Life at Vents and Seeps. , ed. by Kallmeyer, J. Life in Extreme Environments, 5 . De Gruyter, Berlin, pp. 1-32.
    Details
    Publication Date: 2019-02-21
    Type: Book chapter , NonPeerReviewed
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  • 5
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    Distribution and abundance of pteropods in the western Barents Sea (2017)
    De Gruyter
    In:  Oceanological and Hydrobiological Studies, 46 (4).
    Details
    Publication Date: 2020-05-25
    Description: The abundance and horizontal distribution of three pteropod species, Limacina helicina, Limacina retroversa and Clione limacina were examined in the western entrance of the Barents Sea (Polar Front region) in August 2011. Sixteen samples were collected from 8 sampling sites located along a latitudinal transect. The southern part of the study area (south of 73°N) was dominated by L. retroversa, while L. helicina was mostly observed north of 73°N. Surface water temperature differences between the coldest and the warmest station were around 8°C. The highest density of L. retroversa was found in the south, near the Norwegian coast (nearly 52 000 ind. 1000 m−3), while the highest density of L. helicina was observed in the region of the Arctic water masses (nearly 13 000 ind. 1000 m−3). The sampled population of pteropods comprised mainly juvenile stages. Redundancy analysis (RDA) of the relationships between environmental factors (mean and surface salinity, mean temperature, sampling depth, chlorophyll concentration) and the population structure showed that mean temperature was the most important factor in the study area, explaining 70.5% of the pteropod community variation.
    Type: Article , PeerReviewed
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  • 6
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    Wissenschaftliches Publizieren - Zwischen Digitalisierung, Leistungsmessung, Ökonomisierung und medialer Beobachtung (2016)
    De Gruyter
    In:  , ed. by Weingart, P. and Taubert, N. De Gruyter, Berlin, XII, 296 pp.
    Details
    Publication Date: 2019-02-01
    Type: Book , NonPeerReviewed
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  • 7
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    The seaweed resources of the Philippines (2019)
    De Gruyter
    In:  Botanica Marina, 62 (5). pp. 483-498.
    Details
    Publication Date: 2022-01-31
    Description: This review paper presents information on the production status of economically important seaweed species in the Philippines, new culture technologies for Halymenia durvillei and also an examination of the present but limited use of Sargassum. The country recorded its highest production volume of seaweeds (mainly eucheumatoids) in 2011 amounting to 1,840,832 metric tons (fresh weight). In the subsequent years, the Philippines recorded a steady decline in production which can be attributed to epiphytism, loss of genetic diversity due to the culture methods used (i.e. vegetative propagation), political unrest in the main farming areas of the Southern Philippines, and the frequent occurrence of typhoons. The more than 200,000 ha of farmable areas along available coastlines remain to be tapped and evaluated in order to determine which areas are suitable for seaweed farming. The haphazard harvesting of Sargassum led to the proclamation of Fisheries Order No. 250 which prohibits harvesting of Sargassum. Exploitation of Gelidiela acerosa remains a concern as there is no currently available culture technology for the species. The lack of comprehensive records on Philippine seaweed production needs to be addressed and its diverse algal resources remain to be explored.
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  • 8
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    Genetic analysis of Ulva (Ulvaceae, Chlorophyta) type specimens resolves northeast Pacific blade-forming species (2024)
    De Gruyter
    Details
    Publication Date: 2024-05-16
    Description: Misapplication of Ulva epithets in GenBank has led to confusion in the scientific literature and community. To solve some of the problems, targeted DNA sequencing of plastid encoded rbc L gene amplicons or high-throughput sequencing was performed on all blade-forming Ulva type specimens from the northeast Pacific. Recently collected specimens from at or near type localities were also analyzed for some taxa. Based on these genetic analyses, we confirmed currently recognized species: U. californica , with U. angusta and U. scagelii as heterotypic synonyms, U. stenophylla , U. taeniata , and U. tanneri . Ulva dactylifera , currently considered a synonym of U. taeniata based on morpho-anatomy, is recognized as a distinct species, as is U. expansa whose type specimen was sequenced in 2018. All but two of the ITS, rbc L and tuf A sequences in GenBank that were labeled U. californica were correctly named, in contrast to U. taeniata , for which only one of 14 sequences was correctly labeled. These results show that DNA sequencing of Ulva type specimens is essential for the correct application of names.
    Type: Article , PeerReviewed
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  • 9
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    Taxonomic assessment of blade-forming Ulva species (Ulvales, Chlorophyta) in the Galápagos Archipelago, Ecuador using DNA sequencing (2024)
    De Gruyter
    Details
    Publication Date: 2024-05-16
    Description: DNA sequences were obtained from 32 blade-forming Ulva specimens collected in 2018 and 2019 from four islands in the Galápagos Archipelago: Fernandina, Floreana, Isabela and San Cristóbal. The loci sequenced were nuclear encoded ITS and plastid encoded rbc L and tuf A, all recognized as barcode markers for green algae. Four species were found, Ulva adhaerens , U. lactuca , U. ohnoi and U. tanneri , all of which have had their type specimens sequenced, ensuring the correct application of these names. Only one of these, U. lactuca , was reported historically from the archipelago. Ulva adhaerens was the species most commonly collected and widely distributed, occurring on all four islands. Previously known only from Japan and Korea, this is the first report of U. adhaerens from the southeast Pacific Ocean. Ulva ohnoi was collected on three islands, Isabela, Floreana, and San Cristóbal, and U. lactuca only on the last two. Ulva tanneri is a diminutive, 1–2 cm tall, high intertidal species that is easily overlooked, but likely far more common than the one specimen that was collected. This study of blade-forming Ulva species confirms that a concerted effort, using DNA sequencing, is needed to document the seaweed flora of the Galápagos Archipelago.
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  • 10
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    Updating the Ulvaceae in the green seaweeds of Britain and Ireland (2024)
    De Gruyter
    Details
    Publication Date: 2024-05-16
    Description: The 2007 flora “Green Seaweeds of Britain and Ireland” did not present the molecular data underpinning the Ulvaceae treatment, mostly ITS sequences. Subsequently, names have changed as type material of Ulva species is sequenced and intensive sampling with DNA barcoding adds new European species. To update the Ulvaceae, we systematically sampled from 2007 to 2021, identifying specimens using various molecular markers alongside DNA from type material of four species. We show here that Ulva gigantea , based on rbc L, tuf A and ITS sequences of its holotype, is assigned to Ulva compressa , as is the lectotype of Ulva curvata . Ulva gigantea sensu GenBank and Ulva pseudocurvata are conspecific. The correct name is U. pseudocurvata based on rbc L sequences of the lectotype. Two species of monostromatic Ulvaceae were included in the 2007 flora, but we show that both of them and all earlier British monostromatic collections represent Ulvaria splendens , a species originally described from Alaska. Analysis of two rbc L amplicons of the Ulva sordida lectotype shows that it is conspecific with Ulvaria splendens . Our first genuine collections of Ulvaria obscura from SW England and SW Wales correspond to topotype material from the Bay of Biscay, recent samples from Galicia and unpublished tuf A sequences from Britanny.
    Type: Article , PeerReviewed
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