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Water in the Ocean

Water in the Ocean. Water properties Organisms and water Pressure Temperature Light Chemistry O2 CO2 CaCO3 Salinity Life in the water. Water. Water molecule: electric dipole Salinity: dissolved solids 35ppk: marine water Residence times of elements. Amt (g) Resid t

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Water in the Ocean

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  1. Water in the Ocean Water properties Organisms and water Pressure Temperature Light Chemistry O2 CO2 CaCO3 Salinity Life in the water

  2. Water Water molecule: electric dipole Salinity: dissolved solids 35ppk: marine water Residence times of elements Amt (g)Resid t Na 147 X 1020 2.6 X 108 K 5.3 X 1020 1.1 X 107 Ca 5.6 X 1020 8.0 X 106 Si 5.2 X 1018 1.0 X 104 Mn 1.4 X 1015 7.0 X 103 Fe 1.4 X 1016 1.4 X 102 Al 1.4 X 1016 1.0 X 102 Not cumulative Removal: Sediments Organisms Mineral precipitation Sea spray

  3. Water Liquid is fluid. Fluid will change shape as force is applied Gas is also fluid, but fills space; liquid has surface Density  How tightly packed are molecules Pure H2O: 1.0 g/cm^3 Seawater: 1.02-1.03 g/cm^3 T, salinity affects Water is unusual in  changes Viscosity Resistance to change in shape Important to microorganisms

  4. Organism Sizes and Water Large size: control movement, food contact Self-propelled: Buoyancy, swimming Hunting, scavenging, grazing Small size: water has huge effect Viscosity Ltd propulsion: Migration, currents, settling Boundary layer: microorganisms, filter feeders

  5. Pressure Vertical variability: 1 atm per 10 m Static variability: can change with tides Stenobaric, eurybaric May or may not effect benthos, but have to deal with it! Some fish limited by pressure examples: coelocanth, deep sea fish

  6. Temperature Tropics: Constant: 30C Deep water: Constant: 4C Everywhere else, variable. Fluctuations depend on: mixing daily T flux tides Thermocline Effects: Oxygen CaCO3 Nutrient uptake Activity Eurythermal, stenothermal

  7. Light Very important to primary producers, visual senses Red end of spectrum absorbed in upper 10m Blue scattered Photic zone: depends on turbidity (suspended particles, cloudiness) Shoreline: <1m Open ocean: ~60m Tropical reefs: ~80 Absolute depth, clear water: 1000km

  8. Oxygen Terms: Anoxic/anaerobic – no O2 dysoxic/dysaerobic – low O2 oxic/aerobic -- oxygenated Oxygen saturation changes with T, t, D 3ppm: limiting 5ppm: “safe”

  9. Oxygen continued Sources: Atmosphere Plants Sinks: Decomposition Respiration (animals and plants) Chemical reactions Mechanisms of O2 movement: Diffusion Convection

  10. Chesapeake Bay Diurnal surface O2 variation: T Morning: 85%; afternoon: 115% Seasonal variation Shallow: April: 150% saturation high photosynthesis + low decomp. August: 42% saturation Deep: T control, detrital rain June: 24% saturation Oct: 133% saturation

  11. CO2 and CaCO3(Carbon Dioxide and Calcium Carbonate) H2O + CO2  H2CO3 Carbonic Acid H2CO3  H+ + HCO3-Bicarbonte ion H+ + HCO3  2 H+ + CO32- Carbonate ion Calcite (Calcium Carbonate) and CO2 CO2 + H2O + CaCO3 Ca2+ + 2 HCO- carbon dioxide + water + calcium carbonate  calcium + carbonic acid

  12. CaCO3 2 phases: calcite (stable) aragonite (unstable) Acropora modern Syringopora Carboniferous

  13. Salinity Dissolved solids Ocean water: 35 ppk 0-1ppk at fresh water input (hyposaline) to 150 ppk in evaporative systems (hypersaline) Sediments buffered Variability from: Tides Seasonality: precipitation Unpredictable storms Salinity changes density Animals: Stenohaline vs. euryhaline Direct effects: osmosis Indirect effects: buoyancy

  14. How does living on land differ from living in the water?

  15. Living in the Water On land: Need structure for gravity Air less dense Respiration, movement, heat loss/gain on land Need water for respiration, reproduction Vision, hearing In water: Buoyancy, support Dense water More O2; drag forces; heat loss/gain in water Vision, hearing

  16. Anableps dovii, the four-eyed fish

  17. Fish Morphology and Depth

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