aquatic experiment final

aquatic experiment final - Investigating the Affect of...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Investigating the Affect of Salinity on Bacteria Growth Kayla Murphy Lab Section: 12:20 Thursday GLA: Kathy Bowles Lab Partner: Hannah Hall Spring 2011
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Introduction Heterotrophic bacteria are the primary agents of decomposition for dead material. They act to break down the material into nutrients such as phosphorus, carbon, and nitrogen which can then be absorbed by other organisms or back into the environment. If heterotrophic bacteria did not exist to continue to break down decaying material, our ecosystem would be filled with dead material from hundreds of years ago. There are a number of differences between salt water and fresh water environments which can have an impact on bacteria. Increased salinity in a freshwater environment can negatively impact the way in which vital nutrients are absorbed and distributed. The absorption can slow dramatically as organisms are required to adjust their feeding and living habits in order to account of the increased salt intake. The mixture of salt with freshwater can also create a halocline barrier, which prevents the flow of oxygen throughout the environment. While this change is usually on a microscopic level and does not impact large organisms directly, bacteria can be severely damaged by changes in the oxygen level. A number of factors can inhibit or induce bacteria growth and reproduction. Since heterotrophic bacteria are absorptive feeders, they are sensitive to the fluctuations of the environment. Damaging agents such as chemicals or antibiotics can destroy entire populations. Fortunately, bacteria reproduce very quickly and thus their evolutionary process is rapid. Bacteria colonies best suited to the new environment will survive and continue to reproduce at the same rapid rate. The experiment focuses on the affect of salt on the reproduction of bacteria. The experimenters hypothesize that the addition of salt to a freshwater sample will negatively impact the ability of bacteria to successfully reproduce. The decrease in oxygen availability created by
Background image of page 2
the mixture of fresh water and salt will cause a decrease in the ability of bacteria to grow their population. The increased salinity will also cause nutrients to be absorbed slower and thus bacteria growth rates will slow. If the hypothesis is true, the jar to which salt is added will produce a lower rate of bacteria colonies.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/25/2012 for the course BIOL 1104 taught by Professor Stanger-hall during the Spring '08 term at UGA.

Page1 / 8

aquatic experiment final - Investigating the Affect of...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online