Environmental Science Lab Report

1670 words 7 pages
Estimation of Duckweed Geometric Population Density
Phosphate Depletion
By Ana Rosina Alarcon
University of Texas at El Paso
Department of Environmental Science
Instructor: Gebregiorgis Alay G.

Introduction Duckweed is a small aquatic plant that is able to grow rapidly, making it the ideal specimen for our experiment. It is hypothesized that altering the amount of light received by duckweed will alter its photosynthetic rate. It is predicted that a lower light intensity will lower the rate of growth in duckweed. Also is an important high-protein food source for waterfowl and also is eaten by humans in some parts of the world. As it contains more protein than soybeans, it is sometimes cited as a significant
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| 4 | Â 76 | Â 269 | Â 426 | Â 610 | 702 | Â 1004 | average | Â 71.75 | Â 265.25 | Â 404.25 | Â 578.5 | Â 64305 | Â 917.75 | standard deviation | Â 9.34 | 13.81Â | Â 48.43 | 46Â | Â 66.77 | 23.41Â |

 | relative weekly growth rate | replicate | Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | 1 |  3.90 |  1.296 | 1.49 |  1.095 | 1.77 | 2 |  4.12 |  1.76 |  1.35 |  1.097 |  1.42 | 3 |  3.15 |  1.44 |  1.46 |  1.102 |  1.46 | 4 |  3.53 |  1.58 |  1.43 |  1.150 |  1.43 | average |  4 |  1.519 |  1.4325 |  1.111 |  1.52 | standard deviation |  .36 |  .15 |  .05 | .05 |  .13 |

x-coordinates (time) | y-coordinates (average # of thalli) | 0 | 71.75 | 1 | 265.25 | 2 | 404.25 | 3 | 578.5 | 4 | 643.5 | 5 | 971.75 |

Treatment: 50% MBL | | Treatment: 100% MBL | | Treatment:25% MBL | | Treatment:50% MBL (3X NIT) | x-coordinates (time) | y-coordinates (average # of thalli) | | x-coordinates (time) | y-coordinates (average # of thalli) | | x-coordinates (time) | y-coordinates (average # of thalli) | | x-coordinates (time) | y-coordinates (average # of thalli) | 0 | 54 | | 0 | 71.75 | | 0 | 38 | | 0 | 72.5 | 1 | 198 | | 1 | 265.25 | | 1 | 55 | | 1 | 183.75 | 2 | 260.50 | | 2 | 404.25 | | 2 | 88.5 | | 2 | 310.50 | 3 | 283.25 | | 3 | 578.50 | | 3 | 107.75 | | 3 | 342.25 | 4 | 377.25 | | 4 | 643.50 | | 4 | 103 | | 4 | 361.75 | 5 | 474.75 | | 5 | 971.75 | | 5 | 99 | | 5 |

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