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  • 1
    Online-Ressource
    Online-Ressource
    Cham :Springer International Publishing AG,
    Schlagwort(e): Marine Sciences. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (304 pages)
    Ausgabe: 1st ed.
    ISBN: 9783319302591
    DDC: 579.176
    Sprache: Englisch
    Anmerkung: Intro -- Preface: Building on a History of Dual Careers in the Sciences -- Contents -- Contributors -- Part I: Unraveling Microbial Diversity and Their Processes -- Phagotrophic Protists: Central Roles in Microbial Food Webs -- Overview -- Protists as Elemental Recyclers -- Protists as Consumers of Bacteria -- Protists as Consumers of Phytoplankton -- Protists in High Latitude Food Webs -- Looking to the Future -- Evelyn B. Sherr and Barry F. Sherr -- References -- Drivers That Structure Biodiversity in the Plankton -- Plankton Biodiversity -- Alternate Hypotheses That Explain the Paradox of the Plankton -- An Organismal Perspective on the Paradox of the Plankton: A Biodiversity Explosion from Within? -- Linking Individual Level Behaviors with Plankton Ecology -- Pervasive Intra-specific Variability in the Genetic Diversity, Physiological Capacity, and Behavioral Repertoire of Plankton -- Evolution: Generating and Structuring Diversity over the Long Term -- Opportunities for Progress -- Intra-specific Variability and Its Ramifications for Plankton Ecology Need to Be Quantified -- Plankton Ecology, Now and in the Future -- Tatiana A. Rynearson and Susanne Menden-Deuer -- References -- The Elongated, the Squat and the Spherical: Selective Pressures for Phytoplankton Shape -- Introduction -- Effects of Shape on Diffusion -- Other Selective Pressures -- Lee Karp-Boss and Emmanuel Boss -- References -- Crossing the Freshwater/Saline Barrier: A Phylogenetic Analysis of Bacteria Inhabiting Both Freshwater and Marine Ecosystems -- Introduction -- Recent Data on Shared Taxa -- Synthesis of Published Sequence Data -- Future Perspectives -- Mina Bižić-Ionescu and Danny Ionescu -- References -- Approaches and Challenges for Linking Marine Biogeochemical Models with the "Omics" Revolution -- Introduction -- Bridging the Cultural and Structural Divide. , Omics Measurements for the Modeler -- Biogeochemical Models for Microbial Ecologists -- The Structural Divide -- Relating Existing Omics to Current Biogeochemical Models -- Taxonomy and Diversity -- Targeting Genes and/or Pathways -- Near-Term Innovation -- Conclusions -- Victoria J. Coles and Raleigh R. Hood -- References -- Part II: Viewing Growth and Trophodynamics Through a Stoichiometric Lens -- Out of Africa and into Stoichiometry -- Susan S. Kilham and Peter Kilham -- References -- Exploring the Implications of the Stoichiometric Modulation of Planktonic Predation -- Introduction -- Characterising the Predator-Prey Stoichiometric Link -- Elemental Stoichiometry and Commercial Microalgal Production -- Effects of Temperature, Ocean Acidification and Nutrient Excess -- Avoiding Predation -- Stoichiometry and Mixotrophy -- Conclusions -- Aditee Mitra and Kevin J. Flynn -- References -- Part III: Understanding the Mysteries of Light and Nitrogen -- On Saturating Response Curves from the Dual Perspectives of Photosynthesis and Nitrogen Metabolism -- Introduction -- Static vs. Dynamic Behavior -- Gradient Signals and Dynamics of Response Curves -- Overall Perspective on Dynamic Kinetics -- Todd M. Kana and Patricia M. Glibert -- References -- Nitrate Reductase: A Nexus of Disciplines, Organisms, and Metabolism -- Introduction -- Why Nitrate Reductase? -- Understanding That Has Emerged from Recent NR Measurements -- Recent Advances and Emerging Challenges -- Conclusion -- Erica B. Young and John A. Berges -- References -- The Ammonium Paradox of an Urban High-­Nutrient Low-Growth Estuary -- High-Nutrient Low-Growth Estuaries and Oligotrophication -- Observation of an Ammonium Paradox -- Ammonium: The Gatekeeper Controlling Access to Nitrate -- Frances Wilkerson and Richard Dugdale -- References. , Why Is Planktonic Nitrogen Fixation So Rare in Coastal Marine Ecosystems? Insights from a Cross-Systems Approach -- Roxanne Marino and Robert W. Howarth -- References -- Where Light and Nutrients Collide: The Global Distribution and Activity of Subsurface Chlorophyll Maximum Layers -- At the Confluence of Light and Nutrients -- Distribution of Marine SCMLs -- Phytoplankton Production in SCMLs -- Subsurface Chlorophyll Maximum Layers in Lakes -- Greg M. Silsbe and Sairah Y. Malkin -- References -- Part IV: Looking in the Rear View Mirror: The Long View on Changing Ecosystems -- An Ecosystem in Transition: The Emergence of Mixotrophy in the Arabian Sea -- Introduction -- Materials and Methods -- Arabian Sea Cruises and Sample Collection -- Phytoplankton Cell Counts -- Photosynthetic Rate Measurements -- Autotrophy Versus Heterotrophy in Noctiluca -- Salp Grazing Experiments -- Lipid Accumulation in Noctiluca -- Statistical Analysis -- Results and Discussion -- Emergence of Noctiluca and Shift in Phytoplankton Biodiversity in the Arabian Sea -- Environmental Factors Associated with Outbreaks of Noctiluca Blooms -- Noctiluca and Mixotrophy -- Socioeconomic and Global Significance of Noctiluca Blooms -- Joaquim I. Goes and Helga do R. Gomes -- References -- The Saint Lawrence Island Polynya: A 25-Year Evaluation of an Analogue for Climate Change in Polar Regions -- Introduction -- Synthesis Results and Discussion -- Overview for Synthesis -- Summer Sampling in SLIP (July-September 1990-2015) -- Spring (April-June 1999-2007) -- Winter (March 2008-2010) -- The Northern Bering Sea: Interannual Variability and Change -- Time Series Stations Within the "Western" Cluster Group Under Anadyr Water -- Benthivores -- Overall Summary -- Jacqueline M. Grebmeier and Lee W. Cooper -- References. , Ecological Processes and Nutrient Transfers from Land to Sea: A 25-Year Perspective on Research and Management of the Seine River System -- Introduction -- 1850-1990: Organic Pollution and Oxygen -- 1990-2000: Eutrophication and Algal Blooms -- 2000-2015: Agricultural Pollution and Nitrate Contamination -- Conclusion: From Microbial Ecology to Territorial Biogeochemistry -- Josette Garnier and Gilles Billen -- References -- A Historical Perspective on Eutrophication in the Pensacola Bay Estuary, FL, USA -- Introduction -- Pensacola Bay Physical Setting -- Human Colonization of Pensacola Bay -- River and Estuarine Water Quality -- Controls on Primary Production, Organic Matter, and Nutrient Cycling -- Summary -- Jane M. Caffrey and Michael C. Murrell -- References -- Unpublished Reports -- Websites -- Meeting in the Middle: On the Interactions Between Microalgae and Their Predators or Zooplankton and Their Food -- Introduction -- Materials and Methods -- Results -- Discussion -- Karen H. Wiltshire and Maarten Boersma -- References -- Lake Transparency: A Window into Decadal Variations in Dissolved Organic Carbon Concentrations in Lakes of Acadia National Park, Maine -- Introduction -- Methods -- Model Description and Development -- Results -- Discussion -- Collin Roesler and Charles Culbertson -- References -- Part V: Focusing on Unique Systems, Processes and Dynamics -- Phytoplankton Biodiversity in the Oligotrophic Northwestern Sargasso Sea -- Introduction -- Materials and Methods -- Results -- Discussion -- James L. Pinckney and Tammi L. Richardson -- References -- Biological Oceanography of the Gulf of Carpentaria, Australia: A Review -- Introduction -- Study Area -- Currents and Hydrography -- Phytoplankton and the Role of Nutrients -- Zooplankton -- Penaeid Prawn Larval Ecology -- Larval Dispersal Mechanisms -- Summary Points. , Peter C. Rothlisberg and Michele A. Burford -- References -- Discerning the Causes of Toxic Cyanobacteria (Lyngbya majuscula) Blooms in Moreton Bay, Australia -- Introduction -- Nutrient Interactions -- Light Interactions -- Conceptual Model -- Broader Significance -- Judith M. O'Neil and William C. Dennison -- References -- Copepod, Ctenophore, and Schyphomedusae Control in Structuring the Chesapeake Bay Summer Mesohaline Planktonic Food Web -- Introduction -- Methods -- Results and Discussion -- General Patterns in the Summer Mesohaline Chesapeake Bay -- Top-Down Controls and Thresholds -- Bottom Up Controls in Summer Mesohaline Stations -- Implications -- Kevin G. Sellner and Stella G. Sellner -- References -- Microbiogeochemical Ecophysiology of Freshwater Hydrothermal Vents in Mary Bay Canyon, Yellowstone Lake, Yellowstone National Park WY -- Introduction -- Methods -- Big Picture Outcomes -- Closing Remarks -- Carmen Aguilar and Russell Cuhel -- References -- Index.
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  • 2
    Online-Ressource
    Online-Ressource
    Cham :Springer International Publishing AG,
    Schlagwort(e): Algal blooms. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (460 pages)
    Ausgabe: 1st ed.
    ISBN: 9783319700694
    Serie: Ecological Studies ; v.232
    DDC: 363.738
    Sprache: Englisch
    Anmerkung: Intro -- In Memoriam: Otto Ludwig Lange (1927-2017) -- Contents -- List of Abbreviations -- Part I: Introduction to Harmful Algal Blooms and the GEOHAB Programme -- Chapter 1: Introduction to the Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) Synthesis -- References -- Chapter 2: Harmful Algal Blooms and the Importance of Understanding Their Ecology and Oceanography -- 2.1 Introduction -- 2.2 What Are Harmful Algal Blooms? -- 2.3 How Are HABs Harmful? -- 2.4 Where Do HABs Occur? -- 2.5 Why Are HABs Expanding? -- 2.6 Why the Need for Advancing Knowledge of HAB Ecology and Oceanography? -- 2.7 Conclusions and the Role of GEOHAB -- References -- Chapter 3: Establishment, Goals, and Legacy of the Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) Programme -- 3.1 Introduction -- 3.2 History of GEOHAB -- 3.3 HABs in Upwelling Systems -- 3.4 HABs in Eutrophic Systems -- 3.5 HABs in Stratified Systems -- 3.6 HABs in Fjords and Coastal Embayments -- 3.7 HABs in Benthic Systems -- 3.8 GEOHAB Targeted, Regional, and National Research -- 3.9 Cross-Cutting and Framework Activities -- 3.10 GEOHAB Legacies -- References -- Part II: Global Changes and Harmful Algal Blooms -- Chapter 4: Changing Land-, Sea-, and Airscapes: Sources of Nutrient Pollution Affecting Habitat Suitability for Harmful Algae -- 4.1 Introduction -- 4.2 Land-Based Nutrient Pollution -- 4.3 Changing Seascapes -- 4.4 Coastal Typology and Anthropogenic Changes in Water Flow: Nutrient Retention Effects -- 4.5 Changing Airscapes -- 4.6 Eutrophication Potential and Global HAB Distribution -- 4.7 Future Projections: Millennium Ecosystem Assessment Scenarios -- 4.8 Future Projections: Global Ecosystem Modelling Approaches -- 4.9 Conclusions -- References -- Chapter 5: Harmful Algal Blooms in a Changing Ocean -- 5.1 Introduction. , 5.2 Direct Effects of Temperature on HABs -- 5.3 Direct Effects of Stratification on HABs -- 5.4 Altered Light Field Effects on HABs -- 5.5 Effects of Ocean Acidification on HABs -- 5.6 Effects of Nutrients on HABs -- 5.7 Grazer Effects on HABs -- 5.8 General Strategies to Accelerate Understanding of Climate Change Impacts on HABs -- References -- Part III: Adaptive Strategies and Harmful Algal Blooms -- Chapter 6: Nutrients and Harmful Algal Blooms: Dynamic Kinetics and Flexible Nutrition -- 6.1 Introduction -- 6.2 Limiting Nutrients -- 6.3 Optimal Nutrients -- 6.4 Dynamic Responses -- 6.5 Stoichiometry and Balancing Excess Nutrients -- 6.6 Mixotrophy -- 6.7 Conclusions -- References -- Chapter 7: Mixotrophy in Harmful Algal Blooms: By Whom, on Whom, When, Why, and What Next -- 7.1 Introduction -- 7.2 Mixotrophy Across the Spectrum of Nutrient Supply -- 7.3 Mixotrophs and Cellular Nutrient Stoichiometry -- 7.4 Mixotrophs and the Food Web -- 7.5 Inclusion of Mixotrophy in State-of-the-Art Ecosystem Modelling: The Rationale -- 7.6 Including Mixotrophy in State-of-the-Art Ecosystem Modelling: An Approach -- 7.7 Conclusions -- References -- Chapter 8: The Role of Life Cycle Characteristics in Harmful Algal Bloom Dynamics -- 8.1 Introduction -- 8.2 Dinoflagellates: Alexandrium fundyense and Pyrodinium bahamense -- 8.2.1 Life Cycle of Cyst-Forming Dinoflagellates -- 8.2.2 Bloom Dynamics -- 8.2.2.1 Major Study Areas -- 8.2.2.2 Cyst Distributions and Initiation of Planktonic Blooms -- 8.2.2.3 Bloom Development and Transport -- 8.2.2.4 Sexual Induction and Cyst Formation -- 8.3 Diatoms: Pseudo-nitzschia spp. -- 8.3.1 Life Cycle -- 8.3.2 Bloom Dynamics -- 8.3.3 Modelling of Life Cycle Transitions -- 8.4 Cyanobacteria: Nodularia spumigena -- 8.4.1 Life Cycle -- 8.4.2 Bloom Dynamics -- 8.4.3 Dispersal and Future Distribution -- 8.5 Synthesis and Recommendations. , References -- Part IV: Harmful Algal Blooms in Specific Habitats and Biomes -- Chapter 9: Key Questions and Recent Research Advances on Harmful Algal Blooms in Stratified Systems -- 9.1 Introduction -- 9.2 Key Questions 1: What Are the Turbulence Length Scales Relevant to Harmful Phytoplankton and the Formation of Thin Layers?... -- 9.3 Key Questions 2: What Are the Main Processes Controlling the Population Evolution of a Given Species, and How Does Their R... -- 9.3.1 Bloom Initiation -- 9.3.2 Bloom Maintenance -- 9.3.3 Bloom Decline and TL Erosion -- 9.4 Key Questions 3: How Can We Quantify Modifications in Turbulence by Phytoplankton Through Changes in the Viscosity of Its ... -- 9.5 Key Questions 4: What Nutritional Opportunities Do Thin Layers Provide to Phytoplankton, Especially to the Species Selecte... -- 9.6 Key Question 5: Are Allelopathy and ``Chemical Warfare´´ at Work In Situ Within TLs? -- 9.7 Conclusions and Next Steps -- References -- Chapter 10: Key Questions and Recent Research Advances on Harmful Algal Blooms in Fjords and Coastal Embayments -- 10.1 Introduction -- 10.2 Key Question 1: Are There Definable Adaptive Strategies for HAB Species in Confined and Semi-confined Systems? -- 10.3 Key Question 2: What Is the Importance of Life History Transitions and Cyst Distribution in Bloom Initiation and Maintena... -- 10.4 Key Question 3: How Do Physical Dispersion and Aggregation Processes Within a Semi-confined Basin Affect HAB Growth and D... -- 10.5 Key Question 4: What Is the Relative Contribution of Nutrient Flux and Supply Ratios to HAB Dynamics in Eutrophic Versus ... -- 10.6 Key Question 5: What Is the Importance of Spatial Scale and Retention Time in the Expression and Effects of Allelochemica... -- 10.7 Key Question 6: How Do Embayment Morphology, Bathymetry and Hydrodynamics Affect HAB Dynamics?. , 10.8 Key Question 7: Are the Effects of Human Activities (e.g. Aquaculture) and Global Climate Change on HAB Dynamics Magnifie... -- 10.9 Future Research Priorities -- References -- Chapter 11: Key Questions and Recent Research Advances on Harmful Algal Blooms in Eastern Boundary Upwelling Systems -- 11.1 Introduction -- 11.2 Key Question 1: Are There Definable Adaptive Strategies that Characterize HAB Species in Upwelling Systems? -- 11.3 Key Question 2: What Seeding Strategies Persist Within Upwelling Regions and Are They Consistent Among Regions? -- 11.4 Key Question 3: How Do Small-Scale Physical Processes Affect HAB Growth and Dispersion in Upwelling Systems? -- 11.5 Key Question 4: How Do Nutrient Supply Type and Ratios Determine HAB Population Dynamics in Upwelling Systems? -- 11.6 Key Question 5: What Is the Role of Genetic Predisposition Versus Environmental Conditions in Toxin Production in Differe... -- 11.7 Key Question 6: How Does Coastal Morphology and Bathymetry Affect HAB Dynamics in Upwelling Systems? -- 11.8 Key Question 7: What Is the Relative Importance of Cross-Shelf and Along-Shore Advection for HABs in Different Upwelling ... -- 11.9 Key Question 8: Are Climate Indicators Predictive of HAB Events in Upwelling Systems? -- 11.10 HAB Prediction -- 11.11 Conclusions -- References -- Chapter 12: Key Questions and Recent Research Advances on Harmful Algal Blooms in Relation to Nutrients and Eutrophication -- 12.1 Introduction -- 12.2 Key Question 1: Are There Clusters or Specific Types of HAB Species that Are Indicative of Global HAB Increases? -- 12.3 Key Question 2: To What Extent Do Residence Time and Other Physical Processes Impact the Relationship Between Nutrient Lo... -- 12.4 Key Question 3: How Do Feedbacks and Interactions Between Nutrients and the Planktonic, Microbial Food Web Impact HABs an. , 12.5 Key Question 4.0: Do Anthropogenic Alterations of the Food Web, Including Overfishing and Aquaculture Activities, Synergi... -- 12.6 Key Question 5: How Do Anthropogenic Changes in Land Use, Agricultural Use of Fertilizer, NOx Emissions from Vehicles, an... -- 12.7 Key Question 6: How Do the Stoichiometry and Quality of These Nutrient Sources Regulate the Biological Response, Includin... -- 12.8 Key Question 7: Do Climate Change and Climate Variability Have Impacts on Ecosystems that Augment the Impacts of Eutrophi... -- 12.9 Conclusions -- References -- Chapter 13: Key Questions and Recent Research Advances on Harmful Algal Blooms in Benthic Systems -- 13.1 Introduction -- 13.2 Key Question 1: What Is the Biogeography and Biodiversity of BHABs and the Relationships Among Distributions of BHAB Spec... -- 13.2.1 Gambierdiscus -- 13.2.2 Ostreopsis -- 13.3 Key Question 2: What Are the Relationships Between Eutrophication and Nutrient Transformation Pathways and BHAB Populatio... -- 13.3.1 Gambierdiscus -- 13.3.2 Ostreopsis -- 13.4 Key Question 3: Are There Particular Characteristics and Adaptations of BHAB Species That Determine When and Where They O... -- 13.4.1 Gambierdiscus -- 13.4.2 Ostreopsis -- 13.5 Key Question 4: Are There Mechanisms Underlying BHAB Population and Community Dynamics Across Ecosystem Types That Are Re... -- 13.6 Key Question 5: What New Observation and Modelling Approaches Are Available to Help in the Detection and Prediction of BH... -- 13.7 BHAB Toxins -- 13.7.1 Gambierdiscus -- 13.7.2 Ostreopsis -- 13.8 Impacts on Human Health -- 13.8.1 Health Disorders Associated with Gambierdiscus Outbreaks -- 13.8.2 Health Disorders Associated with Ostreopsis Outbreaks -- 13.9 Summary and Recommendations -- References -- Part V: Spotlight on Harmful Algal Blooms in Asia -- Chapter 14: Overview of Harmful Algal Blooms in Asia. , 14.1 Introduction.
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  • 3
    Schlagwort(e): Life sciences ; Life Sciences ; Geobiology ; Aquatic ecology ; Marine sciences ; Freshwater ; Life sciences ; Geobiology ; Aquatic ecology ; Marine sciences ; Freshwater
    Beschreibung / Inhaltsverzeichnis: Preface to Global Ecology and Oceanography of Harmful Algal BlooHarmful algal Blooms and the Importance of Understanding their Ecology and Oceanography -- Establishment, Goals, and Legacy of the Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) Program -- Changing Land, Sea- and Airscapes: Sources of Nutrient Pollution Affecting Habitat Suitability for Harmful Algae -- Harmful Algal Blooms in a Changing Ocean -- Nutrients and HABs: Dynamic Kinetics and Flexible Nutrition -- Mixotrophy in HABs: by Whom, on Whom, When, Why, and What Next -- The Role of Life Cycle Characteristics in Harmful Algal Bloom Dynamics -- Key Questions and Recent Research Advances on Harmful Algal Blooms in Stratified Systems -- Key Questions and Recent Research Advances on Harmful Algal Blooms in Fjords and Coastal Embayments -- Key Questions and Recent Research Advances on Harmful Algal Blooms in Eastern Boundary Upwelling Systems -- Key Questions and Recent Research Advances on Harmful Algal Blooms in Relation to Nutrients and Eutrophication -- Key Questions and Recent Research Advances on Harmful Algal Blooms in Benthic Systems -- Overview of Harmful Algal Blooms in Asia -- Harmful Algal Blooms in the Coastal Waters of China -- Green Tides of the Yellow Sea: Massive Free-floating Blooms of Ulva prolifera -- Ecological Drivers of Green Noctiluca Blooms in Two Monsoonally Driven Ecosystems -- Advancements and Continuing Challenges of Emerging Technologies and Tools for Detecting Harmful Algal Blooms, Their Antecedent Conditions and Toxins, and Applications in Predictive Models -- Recent Advances in Modelling of Harmful Algal Blooms -- Emerging HAB Research Issues in Freshwater Environments -- Mitigation and Control of HABs -- GlobalHAB: Fostering International Coordination on Harmful Algal Bloom Research in Aquatic Systems.
    Materialart: Online-Ressource
    Seiten: Online-Ressource (XVI, 461 p. 71 illus., 60 illus. in color, online resource)
    ISBN: 9783319700694
    Serie: Ecological Studies, Analysis and Synthesis 232
    RVK:
    Sprache: Englisch
    Anmerkung: Includes bibliographical references and index
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  • 4
    Schlagwort(e): Aquatic biology ; Microbial ecology ; Marine Sciences ; Life sciences ; academia;aquatic ecology;career;eutrophication;harmful algae;nitrogen
    Materialart: Buch
    Seiten: XVII, 300 Seiten in 1 Teil , 31 Illustrationen, 50 Illustrationen , 23.5 cm x 15.5 cm, 4861 g
    Ausgabe: Softcover reprint of the original 1st edition 2016
    ISBN: 3319807633 , 9783319807638
    DDC: 570
    Sprache: Englisch
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  • 5
    Publikationsdatum: 2023-02-15
    Beschreibung: The uptake rates of different nitrogen (N) forms (NO3−, urea, and the amino acids glycine and glutamic acid) by N-deficient, laboratory-grown cells of the mixotrophic haptophyte, Prymnesium parvum, were measured and the preference by the cells for the different forms determined. Cellular N uptake rates (ρcell, fmol N cell−1 h−1) were measured using 15N-labeled N substrates. P. parvum showed high preference for the tested amino acids, in particular glutamic acid, over urea and NO3− under the culture nutrient conditions. However, extrapolating these rates to Baltic Seawater summer conditions, P. parvum would be expected to show higher uptake rates of NO3− and the amino acids relative to urea because of the difference in average concentrations of these substrates. A high uptake rate of glutamic acid at low substrate concentrations suggests that this substrate is likely used through extracellular enzymes. Nitrate, urea and glycine, on the other hand, showed a non-saturating uptake over the tested substrate concentration (1–40 μM-N for NO3− and urea, 0.5–10 μM-N for glycine), indicating slower membrane-transport rates for these substrates.
    Materialart: Article , PeerReviewed
    Format: text
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  • 6
    Publikationsdatum: 2019-07-17
    Beschreibung: Arranging organisms into functional groups aids ecological research by grouping organisms (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally have been split between photoautotrophic “phytoplankton” and phagotrophic “microzoo-plankton”. However, there is a growing recognition of the importance of mixotrophy in euphotic aquatic systems, where many protists often combine photoautotrophic and phagotrophic modes of nutrition. Such organisms do not align with the traditional dichotomy of phytoplankton and microzooplankton. To reflect this understanding,we propose a new functional grouping of planktonic protists in an eco- physiological context: (i) phagoheterotrophs lacking phototrophic capacity, (ii) photoautotrophs lacking phagotrophic capacity,(iii) constitutive mixotrophs (CMs) as phagotrophs with an inherent capacity for phototrophy, and (iv) non-constitutive mixotrophs (NCMs) that acquire their phototrophic capacity by ingesting specific (SNCM) or general non-specific (GNCM) prey. For the first time, we incorporate these functional groups within a foodweb structure and show, using model outputs, that there is scope for significant changes in trophic dynamics depending on the protist functional type description. Accord- ingly, to better reflect the role of mixotrophy, we recommend that as important tools for explanatory and predictive research, aquatic food-web and biogeochemical models need to redefine the protist groups within their frameworks.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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  • 7
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © Oceanography Society, 2010. This article is posted here by permission of Oceanography Society for personal use, not for redistribution. The definitive version was published in Oceanography 23, no. 3 (2010): 126-139, doi: 10.5670/oceanog.2010.28
    Beschreibung: Through its promotion of coordinated international research programs, the Intergovernmental Oceanographic Commission (IOC) has facilitated major progress on some of the most challenging problems in oceanography. Issues of global significance—such as general ocean circulation, the carbon cycle, the structure and dynamics of ecosystems, and harmful algal blooms—are so large in scope that they require international collaboration to be addressed systematically. International collaborations are even more important when these issues are affected by anthropogenic processes— such as climate change, CO2 enhancement, ocean acidification, pollution, and eutrophication—whose impacts may differ greatly throughout the global ocean. These problems require an entire portfolio of research activities, including global surveys, regional process studies, time-series observations, laboratorybased investigations, and satellite remote sensing. Synthesis of this vast array of results presents its own set of challenges (Hofmann et al., 2010), and models offer an explicit framework for integration of the knowledge gained as well as detailed investigation of the underlying dynamics. Models help us to understand what happened in the past, and to make predictions of future changes—both of which support the development of sound policy and decision making. We review examples of how models have been used for this suite of purposes, focusing on areas where IOC played a key role in organizing and coordinating the research activities.
    Beschreibung: Support from the National Science Foundation, National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, and National Institute of Environmental Health Sciences. DS acknowledges CLISAP (Integrated Climate System Analysis and Prediction) at the KlimaCampus of the University of Hamburg. PG acknowledges SCOR/ LOICZ Working Group 132.
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Format: application/pdf
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  • 8
    Publikationsdatum: 2022-05-26
    Beschreibung: © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Protist 167 (2016): 106–120, doi:10.1016/j.protis.2016.01.003.
    Beschreibung: Arranging organisms into functional groups aids ecological research by grouping organisms (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally have been split between photoautotrophic “phytoplankton” and phagotrophic “microzooplankton”. However, there is a growing recognition of the importance of mixotrophy in euphotic aquatic systems, where many protists often combine photoautotrophic and phagotrophic modes of nutrition. Such organisms do not align with the traditional dichotomy of phytoplankton and microzooplankton. To reflect this understanding, we propose a new functional grouping of planktonic protists in an eco-physiological context: (i) phagoheterotrophs lacking phototrophic capacity, (ii) photoautotrophs lacking phagotrophic capacity, (iii) constitutive mixotrophs (CMs) as phagotrophs with an inherent capacity for phototrophy, and (iv) non-constitutive mixotrophs (NCMs) that acquire their phototrophic capacity by ingesting specific (SNCM) or general non-specific (GNCM) prey. For the first time, we incorporate these functional groups within a foodweb structure and show, using model outputs, that there is scope for significant changes in trophic dynamics depending on the protist functional type description. Accordingly, to better reflect the role of mixotrophy, we recommend that as important tools for explanatory and predictive research, aquatic food-web and biogeochemical models need to redefine the protist groups within their frameworks.
    Beschreibung: This work was funded by grants to KJF and AM from the Leverhulme Trust (International Network Grant F00391 V) and NERC (UK) through its iMARNET programme NE/K001345/1.
    Schlagwort(e): Plankton functional types (PFTs) ; Phagotroph ; Phototroph ; Mixotroph ; Phytoplankton ; Microzooplankton
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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