Chapter 3 Life in WaterJan 28 - Chapter 3 Life in Water I...

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Chapter 3 Life in Water Jan 28, 2008 I. Hydrologic Cycle Over 71% earth’s surface is covered in water Oceans 97% Polar ice caps / glaciers 2% Fresh water and ground water less 1% Water is not static (fixed) o Heat – solar powered Kinetic – evaporation (condensation) o Clouds o Precipitation Evaporation Organisms Ground water Surface water *Reference Figure 3.2 Page 49 Turn over time (complete cycle) o Atmosphere – 9 days o Rivers/ Freshwater – 12 to 20 days o Oceans – 3100 yrs II. Oceans Largest biome 3 major biomes (Atlantic, Pacific, Indian) 360 mi/km² o Pacific – 180 mi/km² o Atlantic – 106 mi/km²
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o Indian – 75 mi/km² *Reference Figure 3.5 Page 57 A. Structure 1. Littoral (intertidal zone) – shallow 2. Neritic – coast – continental shelf Oceanic zone – beyond continental shelf Habitats o Benthic (life on bottom) Benthos (sediments) o Pelagic (life above) B. Physical Conditions 80% solar energy in the ocean in first 10m o Very little past 600m Leaves 3400m of deep black water Temperature o Sunlight increase molecules Motion decrease density; warm water on top is cooler Thermocline : layer of water through change of temperature with depth o Thermal stratification (layering) Water movements o Never still
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