DEV BIO 232 Lecture Notes - Lecture 2: Food Processor, Periphyton, Odonata
3 Sep 2014
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Document Summary
3 major fluvial zones: (1) zone of erosion; (2) zone of storage and transport of sediment; (3) zone of sediment deposition. High productivity of wetlands (equal to or greater than rainforests) Ultimate base level - sea level, toward which all moving waters erode. Lotic - flowing or moving water (streams, rivers) Channel erosion occurs on the outside of meanders; deposition (point bars) occurs on the inside of meanders. Non-native (exotic) species - fishes, other examples, their replacement of native species. Oligotrophic - nutrient poor (sterile; little nitrate or orthophosphate- similar to a fertilizer for algae) - typically, cold, clear water; headwater conditions. Eutrophic - abundant supply of nutrients (often a polluted condition; enriched with nitrate and orthophosphate). Generally, the lower down stream, the more eutrophic the conditions. A continuation from material begun in week 1 and a thumbnail sketch of week 2--outline. 4 categories of organic resources in stream ecosystems: primary producers; detritus; dissolved organic matter; animal consumers.
