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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Marine algae. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (394 pages)
    Edition: 1st ed.
    ISBN: 9783030394486
    DDC: 333.9538
    Language: English
    Note: Intro -- Preface -- Foreword -- Contents -- Part I: Introduction -- Chapter 1: Antarctic Seaweeds: Biogeography, Adaptation, and Ecosystem Services -- 1.1 Introduction: The Historical Context -- 1.2 Antarctic Seaweeds in the Wake of Climate Change -- 1.3 The Book -- 1.3.1 Diversity and Biogeography -- 1.3.2 Environment and Ecophysiology -- 1.3.3 Ecological Functions -- 1.3.4 Chemical Ecology -- 1.4 Gaps, Emerging Challenges, and Future Directions -- References -- Part II: Diversity and Biogeography -- Chapter 2: Diversity of Antarctic Seaweeds -- 2.1 The Antarctic Environment -- 2.2 Seaweeds in Antarctica: Definition and Importance -- 2.3 Seaweed Taxonomic Studies in Antarctica: Toward a New Species Compilation -- 2.4 Molecular Taxonomy for the Study of Antarctic Seaweed Diversity -- 2.5 Seaweed Distribution in Antarctica -- 2.6 Concluding Remarks: Gaps and Prospects for the Future -- References -- Chapter 3: Biogeographic Processes Influencing Antarctic and sub-Antarctic Seaweeds -- 3.1 Antarctica's Place in the World: An Isolated Continent? -- 3.1.1 Adaptations of Terrestrial Organisms to Antarctic Conditions -- 3.1.2 Adaptations of Marine Organisms to Antarctic Conditions -- 3.1.3 Evidence for Dispersal of Organisms into the Antarctic -- 3.2 Physical Oceanographic Processes Influencing Movement of Seaweeds into or out of the Antarctic -- 3.2.1 Ekman Transport -- 3.2.2 Eddies -- 3.2.3 Wave-Driven Stokes Drift -- 3.2.4 Surface Currents -- 3.3 Hitch-Hiking to the Antarctic: Passengers on Seaweed Rafts -- 3.3.1 Characteristics of Rafting Species -- 3.3.2 Processes Affecting Establishment of New Taxa in the Antarctic -- 3.4 Concluding Remarks -- References -- Chapter 4: Detached Seaweeds as Important Dispersal Agents Across the Southern Ocean -- 4.1 Introduction -- 4.2 Detached Seaweeds in Antarctica. , 4.3 Abiotic Factors Influencing Floating Seaweeds -- 4.4 Biotic Factors Affecting Floating Seaweeds -- 4.5 Physiology of Floating and Drifting Seaweeds: Traspassing Thermal Barriers -- 4.5.1 Out of Antarctic: Is it Physiologically Feasible? -- References -- Chapter 5: Biogeography of Antarctic Seaweeds Facing Climate Changes -- 5.1 The Abiotic Setting of the Southern Ocean -- 5.2 Biogeographic Patterns -- 5.3 Seaweed Assemblages: Are Antarctic Seaweed Diversity and Richness Changing? -- 5.4 The Physiological Bases of Macroalgal Shifts -- 5.5 Deception Island: A Case Study of Opportunistic, Alien, Cryptic and Cryptogenic Species -- 5.6 Reevaluating Eco-Regions, Isolation, and Endemism in the Southern Ocean -- 5.7 Concluding Remarks: Prospects for the Future Marine Flora of the Southern Ocean -- References -- Chapter 6: Comparative Phylogeography of Antarctic Seaweeds: Genetic Consequences of Historical Climatic Variations -- 6.1 Historical Isolation of Antarctic Marine Macroalgae -- 6.2 Antarctic Marine Macroalgae: Surviving Quaternary Glacial Cycles in Situ -- 6.3 Persistence in Multiple Isolated Glacial Refugia Versus a Single Antarctic Refugium -- 6.4 Antarctic Macroalgae Genetic Diversity: COI and TufA Sequences Data Sets -- 6.5 Brown, Red and Green Macroalgae: Sharing a Common Pattern of Glacial Impact and Postglacial Populations Recovery? -- 6.5.1 Signature of a Drastic Impact of the Last Glacial Maximum -- 6.5.2 One Refugium to Rule Them all -- 6.5.3 Postglacial Recolonization: Widespread Haplotypes Drifting Around Antarctica? -- 6.6 Concluding Remarks -- References -- Part III: Physiology, Productivity and Environmental Reponses -- Chapter 7: Underwater Light Environment of Antarctic Seaweeds -- 7.1 Introduction -- 7.2 Optics of Antarctic Coastal Waters -- 7.2.1 Light in Aquatic Environment -- 7.2.2 Light Climate in Antarctic Waters. , 7.3 Adaptations of Antarctic Seaweeds to Extreme Light Conditions -- 7.3.1 Photosynthetic Shade Adaptation of Antarctic Seaweeds -- 7.3.2 Tolerance of Antarctic Seaweeds to High PAR and UV -- 7.4 Consequences for Light Field Under Current and Future Threats -- 7.4.1 Ozone Depletion -- 7.4.2 Regional Warming -- 7.4.3 Feedback with Other Emergent Threats -- 7.5 Concluding Remarks -- References -- Chapter 8: Production and Biomass of Seaweeds in Newly Ice-Free Areas: Implications for Coastal Processes in a Changing Antarctic Environment -- 8.1 Introduction: Seaweeds in Coastal Marine Ecosystems -- 8.2 Macroalgae and Carbon Fluxes in Antarctic Coastal Areas -- 8.3 Macroalgal Biomass Studies in Antarctica -- 8.4 The Ecosystem of Potter Cove: An Outstanding Case Study -- 8.5 A Dynamic Growth Model for Antarctic Macroalgae Under a Fast-Changing Environment -- 8.6 Seaweed Production in Present and Future Warming Scenarios -- 8.7 Future Prospects -- References -- Chapter 9: Carbon Balance Under a Changing Light Environment -- 9.1 Introduction -- 9.1.1 Climate Change in the Antarctic Coastal Zone -- 9.1.2 Antarctic Seaweeds and the Changing Light Environment -- 9.1.3 Carbon Balance: Concepts and Methodological Challenges -- 9.2 Carbon Balance: A Case Study in Potter Cove -- 9.2.1 Light Availability -- 9.2.2 Photosynthetic Acclimation -- 9.2.3 Daily Carbon Balance of Seaweeds -- 9.3 New Scenarios and Their Implications for Algal Photosynthesis -- 9.4 Concluding Remarks and Future Prospects -- References -- Chapter 10: Life History Strategies, Photosynthesis, and Stress Tolerance in Propagules of Antarctic Seaweeds -- 10.1 Seasonal Strategies and Life History Cycles -- 10.1.1 Season Anticipators -- 10.1.2 Season Responders -- 10.2 Photosynthetic Light Requirements of Early Stages -- 10.2.1 Estimating Photosynthetic Parameters from Chlorophyll Fluorescence. , 10.3 Effects of Environmental Factors on the Biology of Propagules -- 10.3.1 High Solar Radiation -- 10.3.2 Temperature -- 10.3.3 Other Environmental Stressors -- 10.4 Concluding Remarks: Biology of Propagules under Climate Change -- References -- Chapter 11: Form and Function in Antarctic Seaweeds: Photobiological Adaptations, Zonation Patterns, and Ecosystem Feedbacks -- 11.1 Brief Overview of Form and Function in Seaweeds -- 11.2 Functional Groups of Seaweeds in the Antarctic -- 11.3 The Vertical Zonation of Antarctic Seaweeds: A Paradigm of Spatial Distribution of Different Morpho-functional Traits -- 11.4 Light Use Characteristics as a Major Factor Delineating Physiological Thallus Anatomy of Seaweeds -- 11.5 Form and Function in the Context of Life Strategies and Stress Tolerance -- 11.6 Functional Traits of Seaweeds and Properties of Benthic Communities -- 11.7 Concluding Remarks -- References -- Part IV: Biological Interactions and Ecosystem Processes -- Chapter 12: Successional Processes in Antarctic Benthic Algae -- 12.1 Introduction -- 12.2 Structural Patterns and Changes in Algal Community Composition during Succession -- 12.3 Ecological Factors Influencing Antarctic Algal Succession -- 12.3.1 Ultraviolet Radiation -- 12.3.2 Grazing -- 12.3.3 Glacier Retreat -- 12.4 Experimental Approaches to Study In Situ Succession of Antarctic Benthic Algae -- 12.5 Concluding Remarks and Perspectives -- References -- Chapter 13: Seaweed-Herbivore Interactions: Grazing as Biotic Filtering in Intertidal Antarctic Ecosystems -- 13.1 Biological Invasions and Their Impact on the Ecology of Antarctic Coastal Systems -- 13.2 Recent Introductions of Exotic Macroalgae in Antarctica -- 13.3 Can Grazers Control Alien Macroalgae in Antarctica? -- 13.4 Ulva intestinalis as a Case Study in a Simple, Two-Species Assembly Model -- 13.5 Concluding Remarks -- References. , Chapter 14: Diversity and Functioning of Antarctic Seaweed Microbiomes -- 14.1 Introduction: Environment and Antarctic Seaweed Host-Microbiome -- 14.2 Functional Interactions of Antarctic Seaweeds and Their Associated Microbiota -- 14.3 Deciphering the Structure and Diversity of Seaweed Microbiomes -- 14.4 Variation of Bacterial Community Diversity in Antarctic Seaweeds -- 14.5 Conclusions and Future Perspectives -- References -- Chapter 15: Seaweeds in the Antarctic Marine Coastal Food Web -- 15.1 Introduction -- 15.2 Food Webs and Seaweeds -- 15.3 Network Dynamics and Robustness -- 15.4 Non-Trophic Interactions -- 15.5 Final Remarks -- References -- Chapter 16: Trophic Networks and Ecosystem Functioning -- 16.1 Introduction -- 16.1.1 Quantitative and Semiquantitative Multispecies Trophic Modelling -- 16.1.2 Selection of Model Components, Sampling Programs, and Data Sources -- 16.2 Macroscopic Ecosystem-Network Properties -- 16.2.1 Macroscopic Properties of Coastal Benthic-Pelagic Ecosystem at Fildes Bay -- 16.3 Keystone Species Complex (KSC) -- 16.3.1 Functional Keystoneness Indices -- 16.3.2 Topological Keystone Index -- 16.3.3 Semiquantitative or Qualitative Keystone Index -- 16.3.4 Centrality of Node Sets -- 16.3.5 Keystone Species Complex in Benthic-Pelagic Ecosystem at Fildes Bay -- 16.4 Contribution of Keystone Species Complex to Macroscopic Network Properties -- 16.5 Constrains and Perspectives -- Appendix 16.A -- References -- Part V: Chemical Ecology -- Chapter 17: Chemical Mediation of Antarctic Macroalga-Grazer Interactions -- 17.1 Introduction -- 17.2 Feeding Bioassay Methodology -- 17.3 Antarctic Macroalgal Resistance to Herbivory -- 17.3.1 Macroalgal Palatability and Resistance to Amphipods -- 17.3.2 Macroalgal Palatability and Resistance to Fish -- 17.3.3 Macroalgal Palatability and Resistance to Sea Stars. , 17.3.4 Macroalgal Palatability and Resistance to Sea Urchins in McMurdo Sound.
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  • 2
    Book
    Book
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Keywords: Hochschulschrift ; Forschungsbericht ; Arktis ; Braunalgen ; Autökologie ; Braunalgen ; Arktis
    Type of Medium: Book
    Pages: XII, 99 S. , graph. Darst.
    Series Statement: Berichte zur Polarforschung 238
    RVK:
    RVK:
    RVK:
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    Language: English
    Note: Titel falsch übersetzt. Eigentlich ... Braunalgen der Antarktis , Vollst. zugl.: Bremen, Univ., Diss., 1997
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  • 3
    In: Marine biology, Berlin : Springer, 1967, (2008), 1432-1793
    In: year:2008
    In: extent:12
    Description / Table of Contents: Chemical defense is assumed to be costly and therefore algae should allocate defense investments in a way to reduce costs and optimize their overall fitness. Thus, lifetime expectation of particular tissues and their contribution to the fitness of the alga may affect defense allocation. Two brown algae common to the SE Pacific coasts, Lessonia nigrescens Bory and Macrocystis integrifolia Bory, feature important ontogenetic differences in the development of reproductive structures; in L. nigrescens blade tissues pass from a vegetative stage to a reproductive stage, while in M. integrifolia reproductive and vegetative functions are spatially separated on different blades. We hypothesized that vegetative blades of L. nigrescens with important future functions are more (or equally) defended than reproductive blades, whereas in M. integrifolia defense should be mainly allocated to reproductive blades (sporophylls), which are considered to make a higher contribution to fitness. Herein, within-plant variation in susceptibility of reproductive and vegetative tissues to herbivory and in allocation of phlorotannins (phenolics) and N-compounds was compared. The results show that phlorotannin and N-concentrations were higher in reproductive blade tissues for both investigated algae. However, preferences by amphipod grazers (Parhyalella penai) for either tissue type differed between the two algal species. Fresh reproductive tissue of L. nigrescens was more consumed than vegetative tissue, while the reverse was found in M. integrifolia, thus confirming the original hypothesis. This suggests that future fitness function might indeed be a useful predictor of anti-herbivore defense in large, perennial kelps. Results from feeding assays with artificial pellets that were made with air-dried material and extract-treated Ulva powder indicated that defenses in live algae are probably not based on chemicals that can be extracted or remain intact after air-drying and grinding up algal tissues. Instead, anti-herbivore defense against amphipod mesograzers seems to depend on structural traits of living algae.
    Type of Medium: Online Resource
    Pages: 12
    ISSN: 1432-1793
    Language: English
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  • 4
    Keywords: Aquatic ecology . ; Plant physiology. ; Community ecology, Biotic. ; Plant ecology. ; Seetang
    Description / Table of Contents: Seaweeds (macroalgae) represent the most striking living components in the Antarctic’s near-shore ecosystems, especially across the West Antarctic Peninsula and adjacent islands. Due to their abundance, their central roles as primary producers and foundation organisms, and as sources of diverse metabolically active products, seaweed assemblages are fundamental to biogeochemical cycles in Antarctic coastal systems. In recent years, the imminence of climate change and the direct impacts of human beings, which are affecting vast regions of the Antarctic, have highlighted the importance of seaweed processes in connection with biodiversity, adaptation and interactions in the benthic network. Various research groups have been actively involved in the investigation of these topics. Many of these research efforts have a long tradition, while some “newcomers” have also recently contributed important new approaches to the study of these organisms, benefiting polar science as a whole. This book provides an overview of recent advances and insights gleaned over the past several years. Focusing on a timely topic and extremely valuable resource, it assesses the challenges and outlines future directions in the study of Antarctic seaweeds.
    Type of Medium: Book
    Pages: xiv, 397 Seiten , Illustrationen
    ISBN: 9783030394479 , 9783030394509
    Language: English
    Note: Literaturangaben , Antarctic Seaweeds: Biogeography, Adaptation and Ecosystem Services -- Diversity of Antarctic Seaweeds -- Biogeographic Processes Influencing Antarctic and Sub-Antarctic Seaweeds -- Detached Seaweeds as Important Dispersal Agents Across the Southern Ocean.-Biogeography of Antarctic Seaweeds Facing Climate Changes -- Comparative Phylogeography of Antarctic Seaweeds: Genetic Consequences of Historical Climatic Variations -- Underwater Light Environment of Antarctic Seaweeds -- Production and Biomass of Seaweeds in Newly Ice-Free Areas: Implications for Coastal Processes in a Changing Antarctic Environment -- Carbon Balance Under a Changing Light Environment -- Life History Strategies, Photosynthesis and Stress Tolerance in Propagules of Antarctic Seaweeds -- Form and Function in Antarctic Seaweeds: Photobiological Adaptations, Zonation Patterns and Ecosystem Feedbacks -- Successional Processes in Antarctic Benthic Algae -- Seaweed-Herbivore Interactions: Grazing as Biotic Filtering in Intertidal Antarctic Ecosystems -- Diversity and Functioning of Antarctic Seaweed Microbiomes -- Seaweeds in the Antarctic Marine Coastal Food Web -- Trophic Networks and Ecosystem Functioning -- Chemical Mediation of Antarctic Macroalgal-Grazer Interactions -- Brown Algal Phlorotannins: An Overview of their Functional Roles.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 31 (1992), S. 0 
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In a 2-year period, 30 patients with culture-proven mycoses (chromoblastomycosis, sporotrichosis, and paracoccid-ioidomycosis) were treated with the new orally administered triazole, saperconazole (SPZ) (R66905). The daily dose varied from 100 to 200 mg. All patients responded to treatment; the mean time required to heal the lesions and convert the cultures to negative was 3.5 months for sporotrichosis, 4.6 for paracoccidioidomycosis, and 9.0 for chromoblastomycosis. Evaluation by a scoring system indicated that 36.6% of the patients achieved complete resolution of the pretherapy abnormalities, while the remaining (63.3%) experienced major improvement. No colateral effects were reported; there were no bone-marrow or liver toxicities. SPZ is an effective drug for the treatment of the above-mentioned mycoses and appears to be suitable for the control of chromoblastomycosis.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 544 (1988), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Polar biology 17 (1997), S. 281-284 
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Halogenating activities were determined in samples of 18 cultivated species of brown, red and green macroalgae from the Antarctic. Activities for the halogenating organic compounds with bromide, iodide and chloride were found. Investigated red algae (rhodophytes) showed higher brominating and iodinating activities compared to brown (phaeophytes) and green (chlorophytes) algae. The highest brominating and iodinating activities were measured in the red algae Plocamium cartilagineum (1.11±0.01 U g-1 wet algal weight and 0.18 U g-1 wet algal weight, respectively) and Myriogramme mangini (3.62±0.17 U g-1 wet algal weight and 4.5 U g-1 wet algal weight, respectively). Chlorinating activities were detected in the red alga Plocamium cartilagineum only (0.086 U g-1 wet algal weight).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5117
    Keywords: seaweed ; Iridaea laminarioides ; harvesting ; regeneration ; resource management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-5176
    Keywords: UV-radiation ; chlorophyll fluorescence ; photosynthesis ; stress tolerance ; electron transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photoinhibition and recovery kinetics after short exposure to solar radiation following three different irradiance treatments of irradiances (PAR, PAR+UVA and PAR+UVA+UVB) was assessed in two intertidal species of the genus Gelidium, Gelidium sesquipedale and G. latifolium, collected from Tarifa (southern Spain) using in vivo chlorophyll fluorescence (PAM fluorometry). After 3 h UV radiation exposure, optimal quantum efficiency (Fv/Fm) in G. sesquipedale decreased between 25 and 35% relative to the control. Under PAR alone, values decreased to 60%. In G. latifolium, photoinhibition did not exceed 40%. Similar results were found for the effective quantum yield (ΔF/Fm′), however, no marked differences in relation to light treatments were seen. When plants were shaded for recovery from stress, only in G. latifolium a significant increase in photosynthesis was observed (between 80 and 100% of control). In contrast, photosynthesis of G. sesquipedale suffered a chronic photoinhibition or photodamage under the three light irradiances. Full solar radiation (PAR+UVA+UVB) affected also the electron transport rate in both species. Here, initial slopes of electron transport vs. irradiance curves decreased up to 60% of controls. Although the recovery kinetic under PAR+UVA+UVB conditions was delayed in G. latifolium, after 24 h recovery this species reached significantly higher than G. sesquipedale. PAR impaired electron trasport only in G. sesquipedale. Overall, both species are characterized by different capacity to tolerate enhanced solar radiation. G. latifolium is a sun adapted plant, well suited to intertidal light conditions, whereas G. sesquipedale, growing at shaded sites in the intertidal zone, is more vulnerable to enhanced UV radiation.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2014-01-22
    Description: The Journal of Physical Chemistry B DOI: 10.1021/jp4105344
    Electronic ISSN: 1520-5207
    Topics: Chemistry and Pharmacology , Physics
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