Classification of Marine Life & Habitats. OCN 201 Biology Lecture 3 Professor Grieg Steward
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1 Classification of Marine Life & Habitats OCN 201 Biology Lecture 3 Professor Grieg Steward
2 Autotrophs can make the organic building blocks of life starting from carbon dioxde Heterotrophs have to eat organics carbon dioxide nucleotides sugars H amino acids C H H S lipids
3 Classifying Marine Organisms by Nutrition Autotrophs - use CO 2 to make organics Who: All plants, some protista and bacteria Can use sunlight (photo-) or chemical (chemo-) energy Heterotrophs - Need to consume organic compounds Who: everything that is not autotrophic Mixotrophs - They can do both!
4 Autotrophy (photosynthesis or chemosynthesis) Energy Autotrophic Cell 6CO 2 + 6H 2 O C 6 H 12 O O 2 Sugar Cells are more than sugar. Other compounds are built from simple sugars plus nutrients (Nitrogen, Phosphorous) & trace metals)
5 Respiration Reversing the reaction yields energy the cell can use Autotrophic Cell 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 Energy
6 Heterotrophy Heterotrophs consume organics. Much is respired to get energy and some is used as building blocks to grow. Heterotroph 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 Energy & growth
7 Mixotrophy Very common among marine plankton Many Protists in the ocean are both phytoplankton AND predators! Photosynthesis & predation
8 Mixotrophs can do this Carbon Dioxide But when nutrients are scarce Water Sugar They can t make all the necessary building blocks So they EAT other cells to get their nutrients especially nitrogen (N) and phosphorus (P)
9 Heterotrophs Photoautotrophs 500 million ANIMALS FUNGI PLANTS 700 million Multicellular Life 2 billion > 3.5 billion Eukaryotes (Protists) Photosynthesis (Cyanobacteria) Bacteria and Archaea Photoautotrophs Heterotrophs Mixotrophs Photoautotrophs Chemoautotrophs Heterotrophs Mixotrophs
10 Mixotrophic Animals EXCEPTIONS Truly Mixotrophic Plants Photo: Patrick J. Krug Sea Slug Eastern Emerald Elysia thisiswhyimbroke.com Venus Fly Trap Upside-down Jelly Cassiopea Photo: Linda & Jason Laurence Gaume, Yoel Forterre Pitcher Plant
11 Classifying Marine Organisms by Habitat Benthic (benthos = bottom) Pelagic (pelagius = of the sea) Ocean Habitats Intertidal (littoral) zone BENTHIC PELAGIC
12 Classifying Marine Organisms by Lifestyle Benthic (benthos = bottom) Infauna Epifauna Pelagic (pelagius = of the sea) Plankton (Drifters, weak swimmers) Nekton (Swimmers) Infauna Epifauna
13 Pelagic Organisms 35 mm Nekton (all are animals) Plankton 5 mm phytoplankton zooplankton bacterioplankton
14 Physical Divisions of the Marine Environment Supralittoral (splash zone) NERITIC OCEANIC Sublittoral Littoral (intertidal) Epipelagic Mesopelagic 200 m 1000 m Bathyal Bathypelagic Abyssal Hadal Abyssopelagic Hadalpelagic 4000 m 6000 m
15 Physical & Chemical Factors Affecting Life Temperature & Light DECREASE with Depth & Latitude Pressure INCREASES with Depth Salinity more variable near shore Air exposure in the littoral zone
16 Pressure Increases with Depth Photo courtesy Kate Achilles
17 Deep-diving marine mammals have collapsible lungs
18 Temperature Variations Temperature Decreases with Depth Temperature Decreases with Latitude POLAR TEMPERATE TROPICAL TEMPERATE POLAR
19 Light Variations Light intensity decreases with latitude and with depth Sunlight Pressure Light energy Pressure
20 TOTAL light and COLOR Spectrum Vary with depth Red Yellow Green Blue UV Good Light Euphotic zone= where photosynthesis is possible! Euphotic 20 to 100 m Twilight Disphotic Disphotic zone= there is light but not enough for photosynthesis! about 600 m No Light Aphotic No light from the sun penetrates
21 Photosynthesis Feeds The Ocean Energy Food
22 The Pelagic Divisions (By Light) EUPHOTIC ZONE DISPHOTIC ZONE Good Light Twilight Photosynthesis can only happen up here! 20 to 100 m APHOTIC ZONE No Light about 600 m
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