This experiment was used to see the effect of salt water on algae in fresh water bodies. The effect of salt water on algae will cause their numbers to decrease. Algae has been used as an indicator organism to give an idea of ​​pollution concentrations. (Colgan, 33) Salt water can cause many problems if salt water enters fresh water streams. This salty water can contaminate the world's aquifers and drinking water. This idea is supported by Spatafora's article on saltwater intrusion: "When this occurs, it will shift the freshwater-saltwater interface inland, resulting in a higher saline concentration in aquifer water, making it useless for human consumption unless it is treated. » Spatafora, 2008) Not only can salt water affect drinking water, but it also cannot be used for irrigation, as shown in F. Lugoli's article on southern groundwater contamination -eastern Salento: “Results indicated widespread salt pollution and microbial contamination. Contamination with fecal microorganisms presented a significant risk of human infection in 100% of samples. Furthermore, the water was unsuitable for irrigation in a high percentage of cases (31.8%), which is of considerable importance given that agriculture is one of the most important economic activities in the area studied. » (Lugoli, 2010) Salt water can also kill plants, algae, and ultimately the animals that use that water for food and nutrition. Increasing amounts of salt water can cause plant death, as shown in Winn's article on salt water intrusion and morphological change at the mouth of the East Alligator River, Northern Territory: "A Significant morphological change has occurred since 1950, with the tidal creek extending 4 km inland. .... middle of paper ......y fourteen to take a good sample. Algae quantities are measured by the absorbance of light found. Works Cited Colgan, Wes III, Ramsey, Linda, White, James D. and Spaulding, Jim. Explorations in biology. 6th ed. Boston: Pearson, 2010. 33-36. Print.Lugoli, F., Leopizzi, MI, Bagordo, F., Grassi, T., Guido, M. and Donno, A. De. “Widespread microbiological contamination of groundwater in southeastern Salento (Apulia-Italy ). » Journal of Environmental Monitoring. 13 (2010): 192-200. Internet. April 12, 2014. Spatafora, James. “Saltwater intrusion into coastal aquifers in the United States” Johnson State College. May 6, 2008. the web. April 12, 2014. Winn, KO, Saynor, MJ, Eliot, MJ and Elio, I. “Saltwater intrusion and morphological change at the mouth of the East Alligator River, Northern Territory.” » Journal of Coastal Research. 22.1 (2006): 137-149. Internet. April 12. 2014.