01:119:117 Study Guide - Final Guide: Dna Barcoding, Limiting Factor, Eutrophication
3 Jan 2019
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A limiting nutrient is the element that must be added for production to increase. The nutrient most often limiting marine production is either nitrogen or phosphorus. Nutrient enrichment experiments have revealed that the availability of the micronutrient iron limits primary production in sarasso ocean. In freshwater lakes, nutrient limitation is also common. Eutrophication: fertilizer runoff from farms and lawns adds considerable nutrients to lakes, promoting the growth of primary producers. When the primary producers die, detritivores decompose them, depleting the water of much or all of its oxygen. Phosphorus availability limited cyanobacterial growth in many lakes. Dna barcoding: a system of identifying species using a conserved region of dna (nucleotide sequences that has little to no variation across species; it has remain relatively constant through evolution) Steps: collect purify genomic dna amplify dna using pcr gel electrophoresis . Mnemonic: [i] can pass another great science assignment (awesome)
