2-5 Metabolic Rates in the Deep Sea (Guest)

2-5 Metabolic Rates in the Deep Sea (Guest) - The Deep Sea...

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Click to edit Master subtitle style The Deep Sea Metabolic Rates
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9/14/10 Are there patterns in the respiratory rates of deep-living taxa with depth? If there are patterns, what factors are responsible?
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9/14/10 Biological and ecological factors may affect respiration Locomotory ability Foraging mode Vertical migration
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Metabolic rates Energy requirements for the habitat
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Rates of biological activity in the deep sea Physical and biological environmental factors Selecting for the metabolic rates found for deep-sea animals Biochemical adjustments in deep-sea animals Cause the metabolic rates to fit the constraints (or opportunities) of the environment
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Deep sea Alternative definitions Depths below 200 m Species gradient Depths below 1000 m Constant temperature No sunlight
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Characteristics Cold, constant temperatures (approximately 0 to 4°C) No sunlight No primary production from photosynthesis at depth Elevated hydrostatic pressure An increase of 1 atm for every 10 m depth increase
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Deep-sea species Environmental pressures High pressure Depending on life history and distribution constant or varying pressures
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Characteristics Depth zones Average depth of the ocean is 3800 m By volume, 92% of the ocean is at depths of 200 m or greater By volume, 78.5% of the ocean is at depths of 1000 m or greater
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Hypsographic curve Distribution of earth’s surface at different depths 70% of the planet covered with water Average depth of the ocean 3,800 m Depths range to 11,500 m in the Mindanao Trench
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Hydrostatic Pressure Increases 1 atm for every 10 m increase in depth At the deepest 1,150 atm “Average” pressure 380 atm
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Deep Sea Low Temperature High Hydrostatic Pressure Variable Hydrostatic Pressure Low Food Input
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Species depth distribution patterns Populations Narrow depth range Broad depth range Individuals Diurnal vertical migration Ontogenetic vertical migration
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Deep-sea species Environmental pressures High pressure Depending on life history and distribution constant or varying pressures
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Hydrostatic Pressure Le Chatelier’s principle Pressure acts on volume changes Process proceeding with an increase in volume is inhibited by increased pressure Process proceeding with a decrease in volume is stimulated by increased pressure Only if there is no net volume change is a process independent of pressure
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Volume changes Note it is the volume of the entire solute- solvent system which is relevant
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