Preface | p. xii |
Contributors | p. xv |
Mangroves of Southeast Asia | p. 1 |
Introduction | p. 1 |
Mangrove forest structure and function | p. 2 |
Water column biogeochemistry | p. 3 |
Organic matter sources in mangrove forests | p. 7 |
Decomposition of detritus | p. 9 |
Sediment biogeochemistry | p. 11 |
Total microbial activity in mangrove sediments | p. 12 |
Mineralization pathways in mangrove sediments | p. 15 |
Phosphorus cycling | p. 23 |
Factors influencing the biogeochemistry | p. 25 |
Effect of forest type and age | p. 25 |
Influence of macrofauna | p. 26 |
Effect of seasonal variations on mangrove forest biogeochemistry | p. 28 |
Sediment biogeochemistry and implications for mangrove vegetation | p. 29 |
Biogeochemistry in mangroves affected by anthropogenic activities | p. 31 |
References | p. 34 |
Coral reefs | p. 40 |
Introduction | p. 40 |
Coral reef morphology and zonation | p. 41 |
Basic biogeochemistry | p. 43 |
Carbon | p. 43 |
Dissolved organic matter | p. 47 |
Nitrogen | p. 48 |
Phosphorus | p. 50 |
Silica | p. 51 |
Iodine | p. 51 |
Interstitial geochemistry and hydrology of coral reef frameworks | p. 52 |
Mass transfer-limited biogeochemical rates | p. 54 |
Coral growth in high nutrient water | p. 56 |
Measurement techniques | p. 58 |
Summary statements | p. 59 |
References | p. 59 |
Fjords | p. 65 |
Introduction | p. 65 |
Definition and origin of fjords | p. 66 |
The public and scientific interest in fjords | p. 67 |
Sediment diagenesis in oxic fjords | p. 69 |
The Saguenay Fjord | p. 69 |
Sedimentation | p. 69 |
Composition of the rapidly deposited layers | p. 70 |
Sulfate reduction and sulfide accumulation | p. 70 |
Mercury diagenesis | p. 73 |
Phosphorus and arsenic geochemistry | p. 73 |
Non-steady-state diagenesis | p. 75 |
Elemental cycling in anoxic waters | p. 76 |
Chemical tracers | p. 76 |
Cycling of carbon and nutrients | p. 77 |
Trace element and radionuclide cycling | p. 78 |
Fe-S systematics | p. 81 |
Sulfate reduction and methane oxidation | p. 83 |
Elemental cycling in sediments underlying anoxic waters | p. 84 |
Preservation of organic matter | p. 85 |
References | p. 86 |
The Eastern Mediterranean | p. 91 |
Introduction | p. 91 |
History of the Mediterranean basin | p. 92 |
Basic description of the bathymetry and physical oceanography of the Eastern Mediterranean | p. 93 |
Bathymetry | p. 93 |
Physical circulation of the Eastern Mediterranean | p. 93 |
Formation of LDW | p. 94 |
Formation of LIW | p. 95 |
Recent water mass changes in the Eastern Mediterranean | p. 96 |
Current patterns | p. 97 |
Nutrients and chlorophyll distribution across the Eastern Mediterranean | p. 98 |
General comments | p. 98 |
Seasonal distributions | p. 98 |
Winter | p. 98 |
Spring into summer | p. 100 |
Nutrient distribution below the nutricline | p. 100 |
Total chlorophyll distribution and characteristics | p. 100 |
Light penetration | p. 102 |
Species composition | p. 102 |
The prochlorophytes | p. 102 |
The unicellular cyanobacteria | p. 103 |
The eukaryotes | p. 104 |
Heterotrophic bacteria | p. 104 |
Primary production | p. 105 |
Gradient in biomass and productivity from coastal waters to the open sea | p. 107 |
Effects of mesoscale features on nutrient and chlorophyll distribution and phytoplankton productivity | p. 108 |
Biogeochemical processes in mesoscale features | p. 108 |
Rhodes cold-core (cyclonic) eddy | p. 108 |
Cyprus warm-core (anti-cyclonic) eddy | p. 112 |
Effects of other mesoscale features | p. 113 |
Seasonal changes in phytoplankton biomass as detected by remote sensing | p. 113 |
Nutrient limitation in the Eastern Mediterranean | p. 116 |
Magnitude of man-induced changes in nutrient inputs and their possible effects on the Eastern Mediterranean | p. 118 |
Summary and conclusions | p. 120 |
Acknowledgements | p. 121 |
Glossary | p. 122 |
References | p. 122 |
The Arctic seas | p. 127 |
Summary | p. 127 |
Main features | p. 128 |
Water masses | p. 128 |
Continental shelves | p. 131 |
Sea ice | p. 132 |
Biogeochemical cycles and ecological processes | p. 133 |
Environmental changes | p. 138 |
Climate variability | p. 138 |
Long-term climate change | p. 140 |
Ozone and ultraviolet radiation | p. 143 |
Contaminants | p. 143 |
Natural resources and ecological services | p. 144 |
Indigenous people | p. 144 |
Non-indigenous regional populations | p. 145 |
National/international/global users | p. 146 |
Acknowledgements | p. 147 |
References | p. 147 |
The Arabian Sea | p. 157 |
Introduction | p. 157 |
Geographical setting | p. 157 |
Climate and circulation | p. 158 |
Nutrients and primary production | p. 163 |
Subsurface nutrient trap | p. 163 |
Primary productivity | p. 164 |
New production | p. 166 |
Phytoplankton composition and size distribution | p. 167 |
Chlorophyll and POC | p. 171 |
Effect of changes in mixed layer depth | p. 172 |
Heterotrophic biomass and production | p. 174 |
Heterotrophic bacteria | p. 174 |
Nano- and microheterotrophs | p. 175 |
Mesozooplankton | p. 177 |
Food web structure and export of material to the deep sea | p. 179 |
Phytoplankton growth and mortality | p. 179 |
Particle fluxes to deep sea | p. 180 |
Role of Arabian Sea as a source or sink of carbon dioxide (CO[subscript 2]) | p. 185 |
Oxygen-deficient zones | p. 185 |
Denitrification | p. 186 |
Intermediate nepheloid layer | p. 191 |
Other redox-sensitive elements | p. 192 |
Biological effects | p. 193 |
Benthic processes | p. 195 |
References | p. 198 |
The northeastern Pacific abyssal plain | p. 208 |
Introduction | p. 208 |
Key habitat parameters of deep seafloor communities | p. 208 |
Key habitat parameters | p. 209 |
Substratum type | p. 209 |
Near-bottom currents | p. 210 |
Bottom-water oxygen | p. 211 |
Sinking POC flux | p. 211 |
Redox conditions | p. 211 |
Variation of key habitat parameters in the northeastern Pacific abyssal plain | p. 212 |
Sediment types | p. 212 |
Near-bottom currents and oxygen concentrations | p. 212 |
POC flux and redox conditions | p. 213 |
Northeastern Pacific abyssal zones | p. 213 |
The eutrophic equatorial abyss | p. 214 |
The mesotrophic (sub-equatorial) abyss | p. 217 |
The oligotrophic central gyre abyss | p. 218 |
Sensitivity and resilience to natural and anthropogenic change | p. 220 |
General thoughts | p. 220 |
Potential sensitivity and resilience to specific changes | p. 221 |
Climate variation in the equatorial and North Pacific | p. 221 |
Global increase in atmospheric greenhouse gases and temperatures | p. 223 |
Manganese nodule mining | p. 226 |
Iron fertilization | p. 229 |
Concluding remarks | p. 230 |
Acknowledgments | p. 231 |
References | p. 231 |
Deep-sea hydrothermal vents and cold seeps | p. 238 |
Introduction | p. 238 |
Deep-sea hydrothermal vents and cold seeps | p. 238 |
Life at hydrothermal vents and cold seeps | p. 238 |
Scope of this chapter | p. 240 |
Deep-sea hydrothermal vents | p. 241 |
Distribution and general characteristics | p. 241 |
Geochemical fluxes of gases and elements from hydrothermal vents | p. 243 |
Off-axis diffuse flow versus axial venting | p. 245 |
Subsurface biosphere at mid-ocean ridges | p. 246 |
Evidence for a subsurface biosphere at deep-sea hydrothermal vents | p. 246 |
Biogeochemical interactions in subsurface environments | p. 251 |
Seafloor microbe-mineral interactions at hydrothermal vents | p. 252 |
Microbial distribution and activity at vents | p. 252 |
Biomineralisation at vents | p. 256 |
Fossilisation of microbes at vents | p. 260 |
Bacterial weathering of sulphides | p. 260 |
Biogeochemical interactions in hydrothermal plumes | p. 261 |
General features of hydrothermal plumes | p. 261 |
Microbial ecology of hydrothermal plumes | p. 262 |
Microbial productivity and organic carbon in plumes | p. 263 |
Biogeochemical interactions in plumes | p. 264 |
Biogeochemistry of off-axis vents and seafloor basalt | p. 265 |
Off-axis vents | p. 265 |
Seafloor basalts | p. 266 |
Deep-sea cold seeps | p. 267 |
Distribution, occurrences and general characteristics | p. 267 |
Gas hydrates | p. 268 |
Geochemical fluxes | p. 269 |
Biogeochemistry of seep sediment pore fluids | p. 270 |
Methanogenesis | p. 271 |
Anaerobic sulphate reduction | p. 271 |
Aerobic microbial oxidation of sulphide and methane | p. 272 |
Anaerobic oxidation of methane | p. 273 |
Microbial carbonates | p. 274 |
Stability and perturbations of seafloor hydrothermal vent and cold seep systems | p. 276 |
Geological stability of vents and seeps | p. 276 |
Future perturbations related to resource extraction | p. 277 |
Hydrothermal sulphides | p. 277 |
Cold seeps | p. 278 |
Response of cold seeps and gas hydrates to global warming | p. 278 |
Future work | p. 279 |
Conclusion | p. 282 |
References | p. 282 |
Influence of nutrient biogeochemistry on the ecology of northwest European shelf seas | p. 293 |
Introduction | p. 293 |
Nutrient cycles | p. 294 |
Macronutrient element availability | p. 294 |
Sources of macronutrients | p. 296 |
Sinks of macronutrients | p. 298 |
Observed distributions of macronutrient concentrations and ratios | p. 300 |
Iron | p. 301 |
Plankton biogeochemistry | p. 303 |
Taxonomy and life forms in the plankton | p. 303 |
Theories of floristic composition | p. 308 |
Light-nutrient-mixing explanations | p. 309 |
Biogeochemical controls | p. 310 |
Ecological controls | p. 312 |
Variation in nutrient element ratios and its explanation in terms of plankton biochemistry | p. 315 |
Quantitative theory for nutrient element ratios | p. 320 |
Differences in abilities to assimilate different nutrients | p. 325 |
Theoretical conclusions | p. 327 |
Effects of ambient nutrient ratios on plankton | p. 327 |
Introduction | p. 327 |
Time series: Helgoland and the German Bight | p. 329 |
Mesocosm and other competition experiments | p. 332 |
Observations at sea | p. 337 |
Discussion and conclusions | p. 341 |
Introduction | p. 341 |
Do high ambient N:Si ratios favour flagellates? | p. 342 |
Do non-Redfield ambient N:P ratios perturb pelagic ecosystems? | p. 344 |
The possibility of iron limitation in shelf seas | p. 345 |
Trophic consequences of ratio changes--a Panglossian conclusion? | p. 345 |
A flexible Redfield ratio? | p. 347 |
Dedication | p. 350 |
References | p. 351 |
Index | p. 364 |
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