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  • Journals  (1,745)
  • Other Sources  (36)
  • keine Angabe  (1,326)
  • Erfurt : Thüringer Landesamt für Statistik
  • de Gruyter
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  • Journals  (1,745)
  • Articles  (44)
  • Other Sources  (36)
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  • 1
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    Vegetation of the supralittoral and upper sublittoral zones of the Western German Baltic Sea coast: a phytosociological study (2022)
    de Gruyter
    Details
    Publication Date: 2024-02-07
    Description: Supralittoral and shallow water seaweed communities are particularly exposed to impacts such as climate change and disturbance by humans. Therefore, their classification, the study of composition, and the monitoring of their structural changes are particularly important. A phytosociological survey of the supralittoral and upper sublittoral vegetation of the South West Baltic Sea revealed eight phytobenthos communities with two variants comprising 35 taxa of macrophytes (18 taxa of Chlorophyta, 13 taxa of Rhodophyta and four taxa of Phaeophyceae, Ochrophyta). Five of the eight communities were dominated by Ulvales (Ulva intestinalis, Kornmannia leptoderma, and three Blidingia species), the other three by Fucus vesiculosus. Most Fucus vesiculosus-dominated communities contained U. intestinalis and U. linza as subdominants. Only one of the communities had until now been described as an association ( Ulvetum intestinalis Feldman 1937). The syntaxonomic composition of the investigated vegetation includes both phytocenoses with the domination of green algae ( Ulvetum intestinalis Feldman 1937 and communities of Blidingia marginata, unidentified Blidingia spp. and Kornmannia leptoderma), as well as a number of communities dominated by Fucus vesiculosus. Mainly boreal Atlantic species and cosmopolitans make up the bulk of the species in these associations.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 2
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    Seaweed resources of the Baltic Sea, Kattegat and German and Danish North Sea coasts (2020)
    de Gruyter
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    Publication Date: 2023-02-08
    Description: Due to low salinity and lack of hard substrata, the Baltic Sea and Kattegat area and German and Danish North Sea coasts are characterized by a relatively low diversity of seaweeds. At the same time the areas are severely eutrophicated, which has caused extensive shifts in macroalgal communities toward opportunistic species. Unattached seaweed communities dominated by Furcellaria lumbricalis, which have been a resource for hydrocolloid production since the 1940s, have been severely reduced due to eutrophication and unsustainable harvesting and are nowadays only exploited commercially in Estonia. On the other hand, the biomass of opportunistic seaweeds of various red, green and brown algal genera has increased. They cause ecological problems, are a nuisance on many tourist beaches and constitute at the same time a potential bioresource that is so far only exploited to a limited extent for production of energy and fertilizer. Commercial seaweed cultivation is largely focused on Saccharina latissima and still very limited, but is currently being expanded as a compensation measure for sea-based fish aquaculture. Also land-based seaweed cultivation is primarily employed for recycling of nutrients in tank animal aquaculture, but in most cases so far only on an experimental scale.
    Type: Article , PeerReviewed
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  • 3
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    Open Access: Koste es, was es wolle?: Eine kritische Würdigung der Empfehlungen des Wissenschaftsrates zur Transformation des wissenschaftlichen Publizierens zu Open Access (2022)
    de Gruyter
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    Publication Date: 2022-06-23
    Description: Der Artikel stellt die Empfehlungen des Wissenschaftsrates zur Transformation des wissenschaftlichen Publizierens zu Open Access vor und versucht die Kernpunkte herauszuarbeiten. Anhand dieser Punkte wird erläutert, warum mit diesen Empfehlungen deutlich wird, dass auch knapp 20 Jahre nach Unterzeichnung der Berliner Erklärung noch keine echte Transformation stattgefunden hat und auch den mannigfaltigen Anstrengungen auf bibliothekarischer Seite zum Trotz noch nicht stattfinden konnte. Der Artikel greift außerdem die Punkte der Empfehlungen auf, die vielversprechend sind, aber womöglich eines längeren Atems bedürfen als es manchen Beteiligten recht sein kann.
    Type: Article , NonPeerReviewed
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  • 4
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    Pharmacological effects of Fucus spiralis extracts and phycochemicals: a comprehensive review (2019)
    de Gruyter
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    Publication Date: 2022-04-01
    Description: The value of macroalgae to the pharmaceutical and food industries has increased, due to their richness in compounds with relevant biological activities and health effects. However, there are still many species that are worth exploring, like the edible Fucus spiralis L., widespread throughout the European and African Atlantic coasts. In order to demonstrate the phycochemical, pharmacological and nutritional potential of F. spiralis , this work presents a comprehensive review of studies regarding the bioactivities of F. spiralis extracts and their phycochemicals. A critical analysis of studies is presented, identifying the challenges and opportunities, and unveiling the knowledge gaps in order to guide future research with this alga. Although the studies performed so far have shown the potential of F. spiralis , this review shows that there is still a big gap in the knowledge about its metabolites. In this context, it is suggested that future investigations should focus more on the isolation and unequivocal structural characterization of the metabolites, such as phlorotannins. In addition, some weaknesses in the reviewed literature are mentioned here, which should be avoided in future work, in order to allow a better evaluation of the validity of results and their comparison.
    Type: Article , PeerReviewed
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  • 5
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    Acclimation limits of Fucus evanescens along the salinity gradient of the southwestern Baltic Sea (2019)
    de Gruyter
    In:  Botanica Marina, 62 (1). pp. 31-42.
    Details
    Publication Date: 2022-01-31
    Description: Over recent decades, the neophyte Fucus evanescens has extended eastwards along the salinity gradient within the Baltic Sea, indicating gradual adaptation to low salinity conditions. To find out whether F. evanescens can migrate further into the Baltic Sea and potentially become a competitor to the native F. vesiculosus, the acclimation potentials of different F. evanescens and F. vesiculosus populations were investigated with respect to habitat salinity. For both species, pigmentation, water content, and photosynthetic rate were measured under laboratory and field conditions. The instantaneous measurement data and incubation experiment did not show clear differences in the measured photosynthetic parameters between different salinity levels (6–20), or between species. Maximum likelihood phylogenetic analyses of the nuclear marker PDI (a putative protein disulfide isomerase) separated F. vesiculosus and F. evanescens into well-defined groups supporting the hypothesis that the two very similar species do not represent different morphotypes of the same species/gene pool. These findings indicate that – at least for the vegetative stage of F. evanescens – salinity may not be a limiting factor for a further spread into the Baltic Sea.
    Type: Article , PeerReviewed
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  • 6
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    Seaweeds to the rescue of forgotten diseases: a review (2019)
    de Gruyter
    In:  Botanica Marina, 62 (3). pp. 211-226.
    Details
    Publication Date: 2022-01-31
    Description: Neglected tropical diseases (NTDs) are a group of diseases that are predominant in the poorest parts of the world affecting 1.4 billion people. The development of new drugs is urgently needed in order to combat these forgotten diseases. Natural products from marine organisms have been widely explored as a source of new bioactive molecules. However, despite their enormous potential in drug discovery, not even one seaweed-based molecule has entered pre-clinical testing for NTDs. This review gives an overview of the current status of algal natural products against NTDs. The list of compounds is by no means exhaustive, but covers the most important classes of active substances in marine algae against the most studied NTDs.
    Type: Article , PeerReviewed
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  • 7
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    New records from the southern North Sea and first records from the Baltic Sea of Kornmannia leptoderma (2019)
    de Gruyter
    In:  Botanica Marina, 62 (1). pp. 63-73.
    Details
    Publication Date: 2022-01-31
    Description: Combined genetic, morphological and ontogenetic observations show that the circumarctic boreal green algal macrophyte Kornmannia leptoderma has expanded its distribution range into the Baltic Sea, on a German coastal section of 220 km length. The species is also again (or still) established at its former extreme southern distribution limit in the North Sea, the German island of Helgoland, where it has not been detected during the last four decades. Macroscopic visible sporophytes of K. leptoderma are nowadays present in the Baltic Sea and at Helgoland from February to September, while they were in the past only detected from February to May at Helgoland. This capacity for formation of sporophytes in summer correlates with the circumstance that K. leptoderma from the Baltic Sea can complete its life cycle at 15°C while several studies conducted decades ago with material from Helgoland and from Pacific coasts consistently reported an inhibition of the algal gametogenesis at temperatures that exceed 12°C. Possibly K. leptoderma has undergone adaptations that facilitate its spread into warmer environments, unless the Kornmannia present in the Baltic Sea and on Helgoland today represents a newly introduced cryptic species.
    Type: Article , PeerReviewed
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  • 8
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    Surveying seaweeds from the Ulvales and Fucales in the world’s most frequently used artificial waterway, the Kiel Canal (2019)
    de Gruyter
    In:  Botanica Marina, 62 (1). pp. 51-61.
    Details
    Publication Date: 2022-01-31
    Description: The Kiel Canal is one of the world’s most frequently used inland waterways and connects the SW Baltic Sea with the Wadden Sea. At the same time, the canal is a highly eutrophicated environment that is characterized by salinities that range from 3 to 16. This brackish character could make the Kiel Canal an important stepping stone for the introductions of species into the inner Baltic Sea. It could also hinder the identification of native and introduced species, given the fact that salinity sometimes severely affects algal morphology. Here we report on a survey of introduced and native seaweed species in the canal, focusing on the dominant groups, which are Fucales and Ulvales. Of the Fucales, the introduced species Fucus evanescens was detected nearly exclusively inside the canal, while Fucus vesiculosus dominated rockweed communities directly outside the sluice gates. Morphological analysis and genetic barcoding distinguished three species of Ulvales, Ulva linza, Ulva intestinalis and an unknown and possibly introduced species of the genus Blidingia. Species distributions and – in the case of U. intestinalis – branching patterns were clearly affected by salinity, while thallus sizes appeared to be affected by the specific eutrophication status of sites within the canal.
    Type: Article , PeerReviewed
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  • 9
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    Flow injection spectrophotometric determination of iron(III) using diphenylamine-4-sulfonic acid sodium salt (2008)
    de Gruyter
    In:  Chemical Papers, 62 (4). pp. 345-349.
    Details
    Publication Date: 2020-07-27
    Description: A highly sensitive and very simple spectrophotometric flow-injection analysis (FIA) method for the determination of iron(III) at low concentration levels is presented. The method is based on the measurement of absorbance intensity of the red complex at 410 nm formed by iron(III) and diphenylamine-4-sulfonic acid sodium salt (DPA-4-SA). It is a simple, highly sensitive, fast, and low cost alternative method using the color developing reagent DPA-4-SA in acetate buffer at pH 5.50 and the flow-rate of 1 mL min−1 with the sample throughput of 60 h−1. The method provided a linear determination range between 5 μg L−1 and 200 μg L−1 with the detection limit (3S) of 1 μg L−1 of iron(III) using the injection volume of 20 μL. FIA variables influencing the system performance were optimized. The amount of iron(III) and total iron in river and seawater samples was successfully determined. Repeatability of the measurements was satisfactory at the relative standard deviation of 3.5 % for 5 determinations of 10 μg L−1 iron(III). The accuracy of the method was evaluated using the standard addition method and checked by the analysis of the certified material Std Zn/Al/Cu 43 XZ3F.
    Type: Article , PeerReviewed
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  • 10
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    Effects of ocean acidification on different life-cycle stages of the kelp Laminaria hyperborea (Phaeophyceae) (2012)
    de Gruyter
    In:  Botanica Marina, 55 (5).
    Details
    Publication Date: 2020-06-23
    Description: Our objective for this study was to evaluate the influence of preindustrial and expected future atmospheric CO2 concentrations (280 μatm and 700 μatm pCO2, respectively) on different life-cycle stages of the kelp Laminaria hyperborea from Helgoland (Germany, North Sea). Zoospore germination, gametogenesis, vegetative growth, sorus formation and photosynthetic performance of vegetative and fertile tissue were examined. The contribution of external carbonic anhydrase (exCA) to C-supply for net-photosynthesis (net-PS) and the Chla- and phlorotannin content were investigated. Female gametogenesis and vegetative growth of sporophytes were significantly enhanced under the expected future pCO2. rETR(max) and net-PS of young vegetative sporophytes tended to increase performance at higher pCO2. The trend towards elevated net-PS vanished after inhibition of exCA. In vegetative sporophytes, phlorotannin content and Chla content were not significantly affected by pCO2.
    Type: Article , PeerReviewed
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