L23 Marine ecology and Food webs

L23 Marine ecology and Food webs - Geol 107 L23 1 Trophic...

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Unformatted text preview: Geol 107 L23 10/17/2011 1 Trophic Relationships, Food Chains and Webs Life in the Ocean • Autotrophs Ͳ base of food chain – make organic matter out of inorganic carbon • photosynthesis or chemosynthesis • ¡plants¢ • Heterotrophs – acquire organic matter by eating it • ¡animals¢ Always read the fine print: Macroscopic examples not representative of ocean autotrophs and heterotrophs. The Food Chain • A collection of animals and plants that feed on each other in sequence • Each level in the sequence is called a trophic level – Plants represent the lowest trophic level • primary producers – Animals occupy higher trophic levels feeding on plants and each other An example of a food chain – Tertiary Carnivore £ Human – Secondary Carnivore Ͳ Tuna Primary Carnivore Anchovy High trophic level – Primary Carnivore Ͳ Anchovy – Herbivore Ͳ Copepod – Producer Ͳ Diatom Low trophic level Fishes Microciliates microflagellates ion, wastes on Microbial loop vs “Official” food chain Zooplankton Decomposit Copepod Phytoplankton Cyanobacteria Wastes, decompositi Diatom Dinoflagellate ProchlorococcusSynechococcus Dissolved organic material; inorganic nutrients Stepped Art Biomass •...
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This note was uploaded on 11/21/2011 for the course ECON 404 taught by Professor Carrillo during the Spring '11 term at USC.

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L23 Marine ecology and Food webs - Geol 107 L23 1 Trophic...

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