MAST382 Lecture 19: Class notes 11/10 Basis of Ocean Life
30 Nov 2016
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Water dissolves minerals from rocks and transports them to the oceans. Water is the medium in which the chemical reactions that support life occur. Freshwater and low salinity seawater stay unfrozen under ice in winter in lakes and estuaries. Ocean water temperatures are relatively invariable in comparison with terrestrial temperatures. Water vapor evaporated from the ocean helps transport heat from warm low latitudes to cold high latitudes. Liquid water contributes to that transport through ocean currents. In polar regions, both ice and water moderates climate. Life is composed of organized non-random structures. Molecules -> complexes -> cells -> organs -> organisms. Matter is neither created nor destroyed, only transformed from one form to another. Seawater : h 66% o 33%, cl 0. 33%, na 0. 3% Cells: h 63%, o 26%, c 10%, n 1. 4% Heterotrophy = respiration (c6h12o6+ 6o2 6h2o + 6co2+ energy) Autotrophic organisms synthesize organic matter using light or chem energy.
