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  • 1
    Online-Ressource
    Online-Ressource
    New York :Columbia University Press,
    Schlagwort(e): Ecology -- Methodology. ; Ecology. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: This book discusses the impact of recent advances in the theory of "scaling relationships" and identifies critical issues that must be considered if experimental results are used to understand the temporal and spatial scales of actual ecosystems. The complexity of ecosystems complicates experimental design. How, for example, does a scientist draw boundaries when studying species effects and interactions? Once these boundaries are drawn, how does one treat factors external to that study? Will the failure to consider external factors affect one's ability to extrapolate information across temporal and spatial scales? This volume provides a compilation from a broad range of ecologists with extensive experimental research experience that addresses these and other questions of scaling relations.
    Materialart: Online-Ressource
    Seiten: 1 online resource (362 pages)
    Ausgabe: 1st ed.
    ISBN: 9780231504935
    DDC: 577/.028
    Sprache: Englisch
    Anmerkung: Intro -- Half title -- Series Page -- Title -- Copyright -- Dedication -- Contents -- List of Figures -- List of Tables -- List of Contributors -- Preface -- Part I. Background -- Chapter 1. Scale-Dependence and the Problem of Extrapolation: Implications for Experimental and Natural Coastal Ecosystems -- Experiments and Scale: Key Concepts -- Theory of Scaling Relations -- Scaling Relations in Natural and Experimental Ecosystems -- Scaling Experimental Ecosystems: Approaches and Examples -- Comments -- Appendix -- Acknowledgments -- Literature Cited -- Part II. Scaling Theory -- Chapter 2. Understanding the Problem of Scale in Experimental Ecology -- Experiments in Ecology -- Scale in Ecology -- Dealing with Scale -- Scaling Organism Responses -- Comments -- Acknowledgments -- Literature Cited -- Chapter 3. The Nature of the Scale Issue in Experimentation -- Assumptions and Predictions -- Analog and Digital Experimentation -- Experiments and Description -- Assumptions and What Is Reasonable -- Experimentation to Achieve New Levels of Analysis -- Comments -- Acknowledgments -- Literature Cited -- Chapter 4. Spatial Allometry: Theory and Application to Experimental and Natural Aquatic Ecosystems -- Scaled Quantities and Scope -- Similarity, Scaling Theory, and Scaling Functions -- Application: Primary Production in Lakes -- Application: Fish Catch from Lakes -- Application: Biomass Accumulation in Mesocosms -- Application: Primary Production in Mesocosms -- Scaling Theory: Spatial Allometry for Antagonistic Rates -- Application: Adult-Juvenile Interactions in Benthic Communities -- Application to Mesocosm Analysis -- Comments -- Acknowledgments -- Literature Cited -- Part III. Scaling Mesocosms to Nature -- Chapter 5. Getting It Right and Wrong: Extrapolations Across Experimental Scales -- Successful Extrapolation: An Example. , Comparative Frameworks -- Extrapolation and Lake Enclosure Experiments -- Scales of Interest, Soft Extrapolation, and Context -- Comments -- Acknowledgments -- Literature Cited -- Chapter 6. Some Reluctant Ruminations on Scales (and Claws and Teeth) in Marine Mesocosms -- The 1-10 cm Dilemma -- "As Simple as Possible-But No Simpler" -- Hierarchy and Scale -- Acknowledgments -- Literature Cited -- Chapter 7. Evaluating and Modeling Foraging Performance of Planktivorous and Piscivorous Fish: Effects of Containment and Issues of Scale -- Conceptual Model of Scale-Dependent Constraints on Foraging -- Modeling Planktivore and Piscivore Behavior -- Implications of Containment for Growth Rates of Fish -- Comments -- Acknowledgments -- Literature Cited -- Chapter 8. Experimental Validity and Ecological Scale as Criteria for Evaluating Research Programs -- Scale, Validity, and Ecological Experiments -- A Scale-Validity Framework for Experimental Ecology -- Biodiversity and Ecosystem-Functioning Experiments as Illustration -- Discussion -- Acknowledgments -- Literature Cited -- Part IV. Scale and Experiment in Different Ecosystems -- Chapter 9. Scaling Issues in Experimental Ecology: Freshwater Ecosystems -- Scale Considerations When Conducting Freshwater Experiments -- Assessing Responses in Freshwater Experiments -- Explicit Tests of Scaling Gradients -- Lessons to Be Learned from Unrealistic Experiments -- Freshwater versus Estuarine Experiments and Ecosystems -- Comments -- Acknowledgments -- Literature Cited -- Chapter 10. Terrestrial Perspectives on Issues of Scale in Experimental Ecology -- The Experimentalists' View of Scale -- Theoretical Perspective of Scaling in Experiments -- The Need to Integrate Theory and Design -- Challenges for the Future -- Acknowledgments -- Literature Cited -- Chapter 11. Issues of Scale in Land-Margin Ecosystems. , Definitions of Scale, Scaling, and Scale-Dependent Behavior -- Characteristics of Land-Margin Ecosystems -- Scaled Relationships in Land-Margin Ecosystems and Mesocosms -- Issues of Special Concern in Design and Use of Land-Margin Mesocosms -- Tools for Analysis of Scale and Extrapolating Among Scales in Land-Margin Systems -- Recommendations Concerning Future Work on Scaling of Land-Margin System Properties -- Acknowledgments -- Literature Cited -- Chapter 12. Scaling Issues in Marine Experimental Ecosystems: The Role of Patchiness -- Patchiness in the Pelagic Ocean -- Patchiness Issues Associated with Experimental Ecosystems -- Linking Experimental Ecosystems to Marine Systems -- Comments -- Acknowledgments -- Literature Cited -- Index.
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  • 2
    Online-Ressource
    Online-Ressource
    New York :Columbia University Press,
    Schlagwort(e): Ecology-Methodology. ; Electronic books.
    Beschreibung / Inhaltsverzeichnis: This book discusses the impact of recent advances in the theory of "scaling relationships" and identifies critical issues that must be considered if experimental results are used to understand the temporal and spatial scales of actual ecosystems. The complexity of ecosystems complicates experimental design. How, for example, does a scientist draw boundaries when studying species effects and interactions? Once these boundaries are drawn, how does one treat factors external to that study? Will the failure to consider external factors affect one's ability to extrapolate information across temporal and spatial scales? This volume provides a compilation from a broad range of ecologists with extensive experimental research experience that addresses these and other questions of scaling relations.
    Materialart: Online-Ressource
    Seiten: 1 online resource (405 pages)
    Ausgabe: 1st ed.
    ISBN: 9780231529044
    DDC: 577/.028
    Sprache: Englisch
    Anmerkung: Intro -- Contents -- Figures -- Tables -- Contributors -- Preface -- Acknowledments -- Literature Cited -- PART I BACKGROUND -- Chapter 1. Scale-Dependence and the Problem of Extrapolation: Implications for Experimental and Natural Coastal Ecosystems -- Experiments and Scale: Key Concepts -- Scaling Relations in Natural and Experimental Ecosystems -- Scaling Experimental Ecosystems: Approaches and Examples -- Comments -- Appendix -- Acknowledgments -- Literature Cited -- PART II SCALING THEORY -- Chapter 2. Understanding the Problem of Scale in Experimental Ecology -- Experiments in Ecology -- Scale in Ecology -- Dealing with Scale -- Scaling Organism Responses -- Comments -- Acknowledgments -- Literature Cited -- Chapter 3. The Naure of the Scale Issue in Experimentation -- Assumptions and Predictions -- Analog and Digital Experimentation -- Experiments and Description -- Assumptions and What Is Reasonable -- Experimentation to Achieve New Levels of Analysis -- Comments -- Acknowledgments -- Literature Cited -- Chapter 4. Spatial Allometry: Theory and Application to Experimental and Natural Aquatic Systems -- Similarity, Scaling Theory, and Scaling Functions -- Application: Primary Production in Lakes -- Application: Fish Catch from Lakes -- Application: Biomass Accumulation in Mesocosms -- Application: Primary Production in Mesocosms -- Scaling Theory: Spatial Allometry for Antagonistic Rates -- Application: Adult-Juvenile Interactions in Benthic Communities -- Application to Mesocosm Analysis -- Comments -- Acknowledgments -- Literature Cited -- PART III SCALING MESOCOSMS TO NATURE -- Chapter 5. Getting It Right and Wrong: Extrapolations Across Experimental Scales -- Successful Extrapolation: An Example -- Comparitive Frameworks -- Extrapolation and Lake Enclosure Experiments -- Scales of Interes, Soft Extrapolation, and Context -- Comments. , Acknowledgments -- Literature Cited -- Chapter 6. Some Reluctant Ruminations on Scales (and Claws and Teeth) in Marine Mesocosms -- The 1-10 cm Dilemma -- As Simple as Possible - But No Simpler -- Hierarchy and Scale -- Acknowledgments -- Literature Cited -- Chapter 7. Evaluating and Modeling Foraging Performance of Planktivorous and Piscivorous Fish: Effects of Containment and Issues of Scale -- Conceptual Model of Scale-Dependent Constraints on Foraging -- Modeling Planktivore and Piscivore Behavior -- Implications of Containment for Growth Rates of Fish -- Comments -- Acknowledgments -- Literature Cited -- Chapter 8. Experimental Validity and Ecological Scale as Criteria for Evaluating Research Programs -- Scale, Validity, and Ecological Experiments -- A Scale-Validity Framework for Experimental Ecology -- Biodiversity and Ecosystem-Functioning Experiments as Illustration -- Discussion -- Acknowledgments -- Literature Cited -- PART IV SCALE AND EXPERIMENT IN DIFFERENT ECOSYSTEMS -- Chapter 9. Scaling Issues in Experimental Ecology: Freshwater Ecosystems -- Scale Considerations When Conducting Freshwater Experiments -- Assessing Responses in Freshwater Experiments -- Explicit Tests of Scaling Gradients -- Lessons to Be Learned from Unrealistic Experiments -- Freshwater versus Estuarine Experiments and Ecostystems -- Comments -- Acknowledgments -- Literature Cited -- Chapter 10. Terrestrial Perspectives on Issues of Scale in Experimental Ecology -- The Experimentalists' View of Scale -- Theoretical Perspective of Scaling in Experiments -- The Need to Integrate Theory and Design -- Challenges for the Future -- Acknowledgments -- Literature Cited -- Chapter 11. Issues of Scale in Land-Margin Ecosystems -- Definitions of Scale, Scaling, and Scale-Dependent Behavior -- Characteristics of Land-Margin Ecosystems. , Scaled Relationships in Land-Margin Ecosystems and Mesocosms -- Issue of Special Concern in Design and Use of Land-Margin Mesocosms -- Tools for Analysis of Scale and Extrapolating Among Scales in Land-Margin Systems -- Recommendations Concering Future Work on Scaling of Land-Margin System Properties -- Acknowledgments -- Literature Cited -- Chapter 12. Scaling Issues in Marine Experimental Ecosystems: The Role of Patchiness -- Patchiness in the Pelagic Ocean -- Patchiness Issues Associated with Experimental Ecosystems -- Linking Experimental Ecosystems to Marine Systems -- Comments -- Acknowledgments -- Literature Cited -- Index.
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  • 3
    Schlagwort(e): Coastal ecology Research ; Methodology ; Biotic communities Research ; Methodology ; Marine ecosystem management Research ; Methodology ; Experimental ecology ; Coastal ecology Research ; Methodology ; Biotic communities Research ; Methodology ; Marine ecosystem management Research ; Methodology ; Experimental ecology ; Küstenmeer ; Ökosystem ; Geschlossenes System ; Experiment
    Materialart: Buch
    Seiten: X, 221 S. , Ill., graph. Darst. , 254 mm x 178 mm
    ISBN: 9780387767680 , 9780387767666 , 0387767665
    Serie: Environmental sciences
    RVK:
    Sprache: Englisch
    Anmerkung: Includes bibliographical references and index
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Oecologia 51 (1981), S. 19-27 
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The structure and metabolism of a soft-sediment estuarine macrofaunal community were measured over an annual cycle at two depth-contours in mesohaline Chesapeake Bay. Additional data for plankton productivity and respiration, as well as seston and sediment organics are also summarized for these communities. Benthic community respiration ranged from 0.24–3.38 g O2 m-2 d-1, and significant differences were detected between the two depths. Similarly, macroinfaunal standing stocks reached 11.2 and 32.3 g (ash free) m-2 for 3 m and 6 m depth communities, respectively, and both exhibited mid-summer declines in abundance. Inferences drawn from these data facilitated a partitioning of benthic community respiration into macrofaunal and meiofaunal/microbial components with a residual term, much of which could be explained statistically by interactions between these two components. A multi-variate statistical model developed from these data matched benthic respiration measurements within 1–2 S.E. Mass-balances of organic carbon were estimated for water column and benthos at the two depthcontours for early and late summer, as well as for an entire, time-weighted year. These various analyses led to the tentative conclusions that this benthic community was regulated by such internal factors as macrofaunal/meiofaunal grazing and “microbial gardening”, and by external factors such as temperature and predation by nekton. However, it appears that the ultimate control for this community was the supply of energy from organic carbon.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Archives of environmental contamination and toxicology 15 (1986), S. 277-283 
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract The processes of atrazine (2-chloro-4-[ethylamino]-6-[isopropylamino-]-s-tri-azine) uptake and release in the submersed vascular plant,Potamogeton perfoliatus L., were rapid, approaching equilibrium with the surrounding environment within one hr. The ratio of internal atrazine concentration to external concentration was approximately 10 at the point of maximum photosynthetic inhibition and rapidly increased at lower external atrazine concentrations. The I50 (the concentration inhibiting photosynthesis by 50%) for atrazine in solution was 80 μg/L with the maximum observed photosynthetic reduction (87%) at a solution concentration of 650 μg/L. Initial photosynthetic recovery ofP. perfoliatus following exposure to atrazine was rapid with oxygen evolution from treated plants (5, 25, and 100 μg/L) being statistically indistinguishable from control plants after two hr of atrazine-free wash. However, there was an indication of residual photosynthetic depression in dosed plants, even after a 77 hr recovery period. In Chesapeake Bay, potential long-term exposure of submersed plants to concentrations of atrazine greater than 10 μg/L is doubtful so that reduction ofP. perfoliatus photosynthesis under such conditions would be minimal and reversible.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    ISSN: 1573-5125
    Schlagwort(e): denitrification ; eutrophication ; estuary ; nitrogen ; sediment-water exchange
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In this review of sediment denitrification in estuaries and coastal ecosystems, we examine current denitrification measurement methodologies and the dominant biogeochemical controls on denitrification rates in coastal sediments. Integrated estimates of denitrification in coastal ecosystems are confounded by methodological difficulties, a lack of systematic understanding of the effects of changing environmental conditions, and inadequate attention to spatial and temporal variability to provide both seasonal and annual rates. Recent improvements in measurement techniques involving 15 N techniques and direct N2 concentration changes appear to provide realistic rates of sediment denitrification. Controlling factors in coastal systems include concentrations of water column NO 3 − , overall rates of sediment carbon metabolism, overlying water oxygen concentrations, the depth of oxygen penetration, and the presence/absence of aquatic vegetation and macrofauna. In systems experiencing environmental change, either degradation or improvement, the importance of denitrification can change. With the eutrophication of the Chesapeake Bay, the overall rates of denitrification relative to N loading terms have decreased, with factors such as loss of benthic habitat via anoxia and loss of submerged aquatic vegetation driving such effects.
    Materialart: Digitale Medien
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