BIOL 336 Lecture Notes - Lecture 21: Food Web, Periphyton, Upwelling
20 Apr 2017
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Document Summary
It was found that cells could in fact die: parasitism, washout- not that common, more common in restricted places (small lake, tidal pools, these places get washed out). Common in the lab in continuous cultures: competition- nutrients, nitrate, light. Characterized by very long food chains and therefore lots of losses. Many levels before top predator and lots of energy lost in those transfers: subtropical ocean gyres, summer/stratified temperate oceans, high nutrients, low si:n. food chain is lengthened. Large cells, lots of nutrients, but ratios are very different and therefore a different food chain is created: coastal/eutrophic waters. Topic 16: macroalgal ecology (chapter 22: 1. Basically an aggregation of a whole little world on its own. Use metals in their processes, grazing happening, and nitrogen cycles. A sort of abiotic interaction that includes algae: by a variety of mechanisms, the periphyton-bacteria-organic microlayer surfaces is scraped or browsed.
