BIO205H5 Lecture Notes - Thermocline, Epilimnion, Hypolimnion

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Natural selection acts on individuals (determines whether an animal survives/not) Light availability in column changes depending on depth, etc. Heat availabiliity due to light also limited under water. Epilimnion - layer of water heated by light rays. Thermocline - area of fast temperature change (often very drastic) Hypolimnion - layer of water where heat for light does not affect temperature. Thermoclines: water conditions in terms of temperature in tropical oceans don"t change all that much, polar ocean - not alot of layering, doesn"t change thru seasons. Large amt of biomass produced during summer months: temperate oceans - changes in thermocline associated w/ seasons. In water, sound is 3x faster than in air. Temperature - warm water = faster sound speed. Pressure - high pressure = faster sound. Sound speed drops when passing through thermocline (b/c rapid temp. Thermocline forces sound waves to travel in a straight line.