Infaunal Effects on Permeable Sediment Processes

The role of infauna on permeable sediment processes is poorly understood due to methodological limitations and a lack of empirical data. The interactions among porewater flows, sediments, and biogenic structures present a physically and …


Chapter 1: Executive Summary: Infaunal Effects on Permeable Sediment Processes
Chapter 2: Macrofaunal modification of porewater advection: The role of species
function, species interaction, and kinetics
2.1 Introduction
2.2 Methods
2.2.1 Site and Organisms
2.2.2 Advection and Diffusion Measurements
2.2.3 Fluorescein Loss Measurements
2.2.4 Sediment Porewater Solutes
2.2.5 Chemical Analyses
2.2.6 Sediment Parameters and Measured Permeability
2.2.7 Data Analyses
2.3 Results
2.3.1 Organism Abundance
2.3.2 Advection and Diffusion Experiments
2.3.3 Fluorescein Loss Experiments
2.3.4 Sediment Porewater Solutes
2.3.5 Sediment Parameters
2.4 Discussion
2.5 Tables
Table 2.5.1- Organism Density
Table 2.5.2- ANOVA Interactions
Table 2.5.3- Simple Linear Regression
Table 2.5.4- Multiple Linear Regression
Table 2.5.5- Sediment Properties
2.6 Figures
Figure 2.6.1- Porewater Tracer with Tide
Figure 2.6.2- Distribution of Tracer in Sediment
Figure 2.6.3- Tracer Porewater Profiles
Figure 2.6.4- Infaunal Treatments on Porewater Advection
Figure 2.6.5- Treatment Effects on Porewater Profiles
Figure 2.6.6- Integrated Porewater Concentrations by Treatment
Figure 2.6.7- Sediment Permeability within Experimental Plots
Chapter 3: Macrofaunal influences on permeable sediment fluxes: Species effects, stoichiometric relationships, and environmental consequences.
3.1 Introduction50
3.2 Methods
3.2.1 Microcosms
3.2.2 Sediment and Organisms
3.2.3 Experimental Design
3.2.4 Chemical Analyses
3.2.5 Stoichiometric Values
3.2.6 Data Analyses
3.3 Results
3.3.1 Porewater Velocity
3.3.2 Fecal Production
3.3.3 Solute Fluxes
3.3.4 Stoichiometry
3.4 Discussion
3.5 Tables
Table 3.5.1- Sediment Properties
Table 3.5.2- Average Solute Fluxes
Table 3.5.3- Treatment Effects on Fluxes
Table 3.5.4- Treatment Effects on Stoichiometry
Table 3.5.5.- Comparison of Flux Measurements
Table 3.5.6- Advection and Bioirigation Rates
Table 3.5.7- Comparison of Stoichiometric Ratios
3.6 Figures
Figure 3.6.1- Illustration of Microcosm Setup
Figure 3.6.2- Illustration of d-value Calculation
Figure 3.6.3- Porewater Velocity in Microcosms
Figure 3.6.4- Fecal Production and Tide
Figure 3.6.5- Effluent Concentrations
Figure 3.6.6- Effluent Stoichiometry
Figure 3.6.7- Treatment effects on d-values
Figure 3.6.8- Comparison of Ratios and d-values
Chapter 4: Infaunal Functional Groups and Important Attributes to Permeable Sediment Processes: A Multi-site, Multi-species Investigation
4.1 Introduction
4.2 Methods
4.2.1 Sites and Organisms
2.2 SamplingDesign
4.2.3 Organism Density
4.2.4 Advection Measurements
4.2.5 Porewater Solutes
4.2.6 Granulometry
4.2.7 Statistical Analyses
4.3 Results
4.3.1 Across Site Differences
4.3.2 Within Site Infaunal Effects
4.4 Discussion
4.4.1 Functional Groups and Infaunal Attributes
4.4.2 Within Site Granulometry
4.4.3 Across Site Granulometry
4.4.4 Conclusions
4.5 Tables
Table 4.5.1- Sediment Properties of Experimental Sites
Table 4.5.2- Average Porewater Concentrations
Table 4.5.3- Fluorescein Regression Results
Table 4.5.4- Regression Results for Porewater Chemistry
4.6 Figures
Figure 4.6.1- Surface Features of Infauna
Figure 4.6.2- Organic Matter and Percent Fines
Figure 4.6.3- Fluorescein in Gels and Tidal Range
Figure 4.6.4- Solute Concentrations versus Tidal Range
Figure 4.6.5- Solute Concentrations versus Percent Fines
Figure 4.6.6- Fluorescein in Gels versus Organism Density
Figure 4.6.7- Phosphate and Silicate versus Organism Density
Copyright Permission for Chapter 2

Author: Waldbusser, George

Source: University of Maryland

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