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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Algal blooms. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (460 pages)
    Edition: 1st ed.
    ISBN: 9783319700694
    Series Statement: Ecological Studies ; v.232
    DDC: 363.738
    Language: English
    Note: 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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  • 2
    Keywords: Life sciences ; Life Sciences ; Geobiology ; Aquatic ecology ; Marine sciences ; Freshwater ; Life sciences ; Geobiology ; Aquatic ecology ; Marine sciences ; Freshwater
    Description / Table of Contents: 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.
    Type of Medium: Online Resource
    Pages: Online-Ressource (XVI, 461 p. 71 illus., 60 illus. in color, online resource)
    ISBN: 9783319700694
    Series Statement: Ecological Studies, Analysis and Synthesis 232
    RVK:
    Language: English
    Note: Includes bibliographical references and index
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  • 3
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Marine Sciences. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (304 pages)
    Edition: 1st ed.
    ISBN: 9783319302591
    DDC: 579.176
    Language: English
    Note: 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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  • 4
    Keywords: Aquatic biology ; Microbial ecology ; Marine Sciences ; Life sciences ; academia;aquatic ecology;career;eutrophication;harmful algae;nitrogen
    Type of Medium: Book
    Pages: XVII, 300 Seiten in 1 Teil , 31 Illustrationen, 50 Illustrationen , 23.5 cm x 15.5 cm, 4861 g
    Edition: Softcover reprint of the original 1st edition 2016
    ISBN: 3319807633 , 9783319807638
    DDC: 570
    Language: English
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  • 5
    ISSN: 1365-2486
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Notes: The importance of temperature in regulating physiological processes is without question; however, the interpretation of the relationship between temperature and ecological data is much more complicated. Consequently, it is difficult to decide how the nature of the temperature response terms should be included in models used to predict responses of microbial processes to increasing regional temperature. This analysis compiles several years of data from a research programme conducted in Chesapeake Bay, in an effort to examine how individual microbial processes − as well as the balance between autotrophy and heterotrophy − have responded to temperature, and to predict changes in microbial trophic state based on realistic increases in global temperature. The upper boundary on all of the pelagic microbial rate processes that were measured could be described remarkably well as a linear function of temperature, although there was substantial scatter in the data. Pelagic microbial rate processes (e.g. phytoplankton production, respiration, bacterial productivity) showed a remarkably constrained range of Q10 values from 1.7 to 3.4. The one notable exception to this was nitrogen uptake in the North and Mid Bay, which exhibited Q10 values 〈 1.0. Proxies for phytoplankton biomass (e.g. chlorophyll) were largely independent of temperature while bacterial abundance was significantly related to temperature and was found to have a Q10 of 1.88.    Using these individual temperature responses, the balance of autotrophy and heterotrophy was assessed by calculating the community photosynthesis to respiration (P:R), NH4+ uptake to regeneration (U:R) and phytoplankton to bacterial productivity (PP:BP) ratios for current conditions (all ratios) and for a 2 and 5 °C temperature increase (NH4+ U:R excluded). The NH4+ U:R ratio stayed remarkable constant at ∼1 over the entire temperature range supporting the importance of regenerative processes to nitrogen availability even during periods of heavy allochthonous inputs. These elevated temperature calculations for P:R and PP:BP suggest that the magnitude of autotrophic production during the spring bloom may decrease with increased regional temperature and, as a consequence, the Chesapeake Bay might become net heterotrophic on an annual timescale. These calculations should be considered with caution, but nonetheless demonstrate that the impact of increasing temperature on the balance of autotrophic and heterotrophic processes needs to be researched further.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 363 (1997), S. 1-12 
    ISSN: 1573-5117
    Keywords: top-down control ; bottom-upcontrol ; NH4 +regeneration ; nutrientlimitation ; trophodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Although our understanding of the complexity of theplankton and microbial food webs has increasedsubstantially over the past decade or two, there hasbeen little appreciation to date of the interactionsbetween top-down (grazing) control and bottom-up(nutrient supply) control on the structure andnutrient cycling processes within these webs. Thequality of nutrient supply, both in terms of therelative proportion of inorganic: organic nitrogen,as well as the relative proportion of inorganicnitrogen substrates has a direct impact on rates ofnitrogen uptake, and ultimately on the relativecomposition of phytoplankton and bacteria. At thesame time, grazing by microzooplankton andmacrozooplankton also influences both thecomposition of the food web and the rate of supplyof nitrogen. The impact of macrozooplankton onrates of nitrogen cycling in a microbial communityis complex: macrozooplankton release NH4 +,urea, and amino acids by direct excretion and by’sloppy feeding‘, but they also control both therates of nitrogen regeneration and uptake within thecommunity by grazing the microzooplankton, theprimary regenerators of NH4 +, and thephytoplankton, the primary consumers of nitrogen. Thus, grazing and nitrogen recycling are intricatelyconnected: the presence of large zoooplanktonsimultaneously provides top-down control of biomassand bottom-up nutrient supply. These relationshipsvary depending on the scale of interest, and haveimportant consequences for how we measure and modeltotal nitrogen cycling in a natural food web.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2023-02-15
    Description: 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.
    Type: Article , PeerReviewed
    Format: text
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  • 8
    Publication Date: 2019-07-17
    Description: 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
    Type: Article , isiRev
    Format: application/pdf
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  • 9
    Publication Date: 2022-05-25
    Description: Author Posting. © Oceanography Society, 2005. This article is posted here by permission of Oceanography Society for personal use, not for redistribution. The definitive version was published in Oceanography 18, 2 (2005): 136-147.
    Description: Marine and fresh waters team with life, much of it microscopic, and most of it harmless; in fact, it is this microscopic life on which all aquatic life ultimately depends for food. Microscopic algae also play an important role in regulating atmospheric CO2 by sequestering it during production and transporting it to deeper waters. Yet some of the microscopic “algae” cause problems when they accumulate in sufficient numbers, due either to their production of endogenous toxins, or to their sheer biomass or even their physical shape. These are known as the harmful algae, or, when in sufficient numbers, harmful algal blooms (HABs). These blooms were formerly called “red tides” because many were composed of dinoflagellates containing red pigments that in high densities colored the water red, but blooms may also be green, yellow, or brown, depending on the type of algae present and their pigmentation. As with all blooms, their proliferation results from a combination of physical, chemical, and biological mechanisms and their interactions with other components of the food web that are for the most part poorly understood. Most HABs are dinoflagellates or cyanobacteria, but other classes of algae, including diatoms, have members that may form HABs under some conditions. As stated by J. Ryther and co-workers many years ago, “...there is no necessity to postulate obscure factors which would account for a prodigious growth of dinoflagellates to explain red water. It is necessary only to have conditions favoring the growth and dominance of a moderately large population of a given species, and the proper hydrographic and meteorological conditions to permit the accumulation of organisms at the surface and to effect their future concentrations in localized areas” (Ryther, 1955).
    Description: Funding for these activities has been provided by NSF, NOAA, and the European Commission DG Research-Environment Directorate. GEOHAB is an initiative of SCOR (Scientific Committee on Oceanic Research) and IOC (Intergovernmental Oceanographic Commission of UNESCO). P. Glibert and D. Anderson were funded by the National Oceanic and Atmospheric Administration (NOAA), ECOHAB, MERHAB and NSF.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V., 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Harmful Algae 8 (2008): 39-53, doi:10.1016/j.hal.2008.08.017.
    Description: Coastal waters of the United States (U.S.) are subject to many of the major harmful algal bloom (HAB) poisoning syndromes and impacts. These include paralytic shellfish poisoning (PSP), neurotoxic shellfish poisoning (NSP), amnesic shellfish poisoning (ASP), ciguatera fish poisoning (CFP) and various other HAB phenomena such as fish kills, loss of submerged vegetation, shellfish mortalities, and widespread marine mammal mortalities. Here, the occurrences of selected HABs in a selected set of regions are described in terms of their relationship to eutrophication, illustrating a range of responses. Evidence suggestive of changes in the frequency, extent or magnitude of HABs in these areas is explored in the context of the nutrient sources underlying those blooms, both natural and anthropogenic. In some regions of the U.S., the linkages between HABs and eutrophication are clear and well documented, whereas in others, information is limited, thereby highlighting important areas for further research.
    Description: Support was provided through the Woods Hole Center for Oceans and Human Health (to DMA), National Science Foundation (NSF) grants OCE-9808173 and OCE-0430724 (to DMA), OCE-0234587 (to WPC), OCE04-32479 (to MLP), OCE-0138544 (to RMK), OCE-9981617 (to PMG); National Institute of Environmental Health Sciences (NIEHS) grants P50ES012742-01 (to DMA) and P50ES012740 (to MLP); NOAA Grants NA96OP0099 (to DMA), NA16OP1450 (to VLT), NA96P00084 (to GAV and CAH), NA160C2936 and NA108H-C (to RMK), NA860P0493 and NA04NOS4780241 (to PMG), NA04NOS4780239-02 (to RMK), NA06NOS4780245 (to DWT). Support was also provided from the West Coast Center for Oceans and Human Health (to VLT and WPC), USEPA Grant CR826792-01-0 (to GAV and CAH), and the State of Florida Grant S7701617826 (to GAV and CAH).
    Keywords: Harmful algal blooms ; HABs ; Red tides ; Eutrophication ; Nutrients ; Nitrogen ; Phosphorus
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
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