6+ProductivityTrophicLevels

6

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Unformatted text preview: tems: abundant H2O, good temps., rapid nutrient regeneration too cold / too dry Net primary productivity Primary productivity ...in aquatic ecosystems: limited by: - light (photic zone) - nutrient availability highest rates: - continental margins, shallow seas - from rivers & upwellings ...in terrestrial ecosystems: limited by: - water availability - temperature extremes Trophic Levels & Interactions Flow of energy & nutrients in an ecosystem: - energy: 1-way trip - nutrients: cycle through Autotrophs: - 1ary producers - store energy in C compounds (photosynthesis, chemosynthesis) Heterotrophs: - feed on other organisms; - depend on C & energy fixed by autotrophs Autotrophs 1. Photosynthetic primary producers; differ between terrestrial & aquatic biomes terrestrial: vascular plants aquatic: phytoplankton & algae 2. Chemosynthetic primary producers; oxidize: sulfur, CO, ammonium, iron, hydrogen Nitrifying bacteria ecologically important: increase N availability to plants Heterotrophs Herbivores feed on plants: primary consumers Carnivores feed on herbivores: secondary consumers feed on carnivores: tertiary consumers Detritivores & Decomposers feed on non-living organic matter fungi & bacteria Heterotrophs Parasites Endoparasites live inside the body of hosts Ectoparasites live on the surface of hosts - Host adversely affected - not always killed by parasites - if killed, it...
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This document was uploaded on 03/17/2014 for the course BIO SCI 310 at Wisconsin Milwaukee.

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