Ocean101-MarineBiol-Part2

Ocean101-MarineBiol-Part2 - 1 Marine Biology - Part 2 Life...

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Unformatted text preview: 1 Marine Biology - Part 2 Life in the Ocean 1. Classifcation ! OF environments, OF organisms 2. Distribution oF species ! Pros & cons oF the salty liFe ! Limiting Factors, Adaptations 3. 3. Energy & Food (or, Energy = Food) Energy & Food (or, Energy = Food) ! Photosynthesis, Chemosynthesis Photosynthesis, Chemosynthesis ! Primary productivity, Biomass Primary productivity, Biomass ! Biogeochemical cycles Biogeochemical cycles ! Trophic pyramid, Food webs Trophic pyramid, Food webs 4. 4. Classifcation & Change Classifcation & Change ! Ecosystems, Communities, Populations Ecosystems, Communities, Populations ! Taxonomy, Kingdoms, Phylogeny, Diversity Taxonomy, Kingdoms, Phylogeny, Diversity ! Mass Mass extinctions extinctions 3. Energy & Food See Fig. 12.3, p. 273 Figs. 12.2 & 12.4, pp. 273 & 274 Photo synthesis Chemo synthesis 2 Photosynthesis & Respiration Chemosynthesis (waste product) (waste product) 3 Primary Productivity Primary Productivity Primary productivity = The synthesis of organic materials from inorganic substances by photosynthesis or chemosynthesis Units = ( g C ) / ( m 2 x yr ) = Grams (mass) of carbon bound into carbohydrates, per square- meter of ocean surface-area, per year Phytoplankton (e.g., diatoms) make 90-96% of oceanic carbohydrates (food) Seaweeds = ~2-5%, Chemosynthesis = ~2-5% Biomass = Mass of living tissue (Units = grams) Fig. 12.5b, p. 275 This fgure illustrates the concept oF measuring oceanic productivity in grams oF carbon per square meter per year (gC/m 2-yr) See Fig. 12.5a, p. 275 600-1000 Gtonnes 600-1000 Gtonnes 1-2 Gtonnes 1-2 Gtonnes Biomass Biomass 50-70 Gtonnes/yr 50-70 Gtonnes/yr 35-50 Gtonnes/yr 35-50 Gtonnes/yr Primary Primary productivity productivity Land Land Marine Marine So, which is more So, which is more efficient efficient in production of food? in production of food? See Fig. 12.6b, p. 276 4 5 Fig. 12.5c, p. 275 Primary Productivity Requires Primary Productivity Requires 4 Basic Components: 4 Basic Components: 1. Water 2. Carbon dioxide 3. Inorganic nutrients 4. Sunlight Since water and carbon dioxide are in good supply in the ocean, the factors that usually...
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Ocean101-MarineBiol-Part2 - 1 Marine Biology - Part 2 Life...

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