Providence River Lab Report

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Morgan Sowa Independent Report: Rough Draft Dr. Costello Marine Biology Zooplankton of Fort Wetherill and Providence River Abstract The population densities of zooplankton were investigated in Providence River, and Fort Wetherill. The data from sampling was analyzed to determine if the difference in location had a direct effect on the species of zooplankton present. There was a large difference in the number of zooplankton found at the two locations. Both the density of population, and variety of species was larger at Fort Wetherill. Introduction The sampling of will be done at Fort Wetherill, the lower area of the Narragansett Bay. The Narragansett Bay is a shallow, well –mixed body of water (Martin 1965). Fort Wetherill is the…show more content…
Samples were taken where red arrow is located. The sampling procedure was repeated on November 13th, 2014, at Providence River. The samples were taken in the same exact manner as the week before. All of the samples were then taken into the lab to be analyzed. The analysis was done by identifying the first 100 organisms found in each sample and recording the results in an excel spreadsheet. The analysis procedure was repeated for all samples in order to gain a good representative of the population density and variety found at each tow location. The physical data, along with the analysis of each sample was reported and presented on a large spreadsheet in order to clearly compare results. Figure 2: Map of Narragansett Bay. Fort Wetherill at number 3, and Providence River labeled at number 11. Tows were taken where the red arrows appear. ResultsDate | 13-Nov | 13-Nov | 13-Nov | 6-Nov | 6-Nov | 6-Nov | Site | | | Average 1 | | | Average 1 | Tow | 1 | 2 | | 1 | 2 | | mls analyzed | 70 | 60 | | 45 | 55 | | Acartia | 56 | 48 | 856.9 | 51 | 62 | 1247.6 | Polychaete larvae | 32 | 37 | 568.5 | 24 | 18 | 463.7 | crab zoea | | | 0.0 | 7 | 9 | 176.7…show more content…
The data in table 1 shows that there were more species found in the samples taken from Fort Wetherill. With Providence River being known as a primary producer it would be assumed that there would be more abundant species. Because there are a variety of nutrients available in the Providence River, more species would be able to develop and survive. Although the variety of species did not follow the predicted hypothesis, there is a trend seen when examining figures three and four. When looking at the three most abundant species found in both locations, there are significantly fewer Polychaete Larvae and Unidentified Copepod found at Fort Wetherill. Acartia was higher in abundance at Fort Wetherill, but remained dominant in both locations. Fort Wetherill is at the mouth of the estuary and is a nutrient exporter. It should have been expected that there would be less species surviving. Estuaries transport dissolved nutrients to coastal zones leading to a high productivity in primary and secondary production. Deviations in production can greatly affect species richness, abundance, and productivity (Goel 2014). Ctenophores are major predators of zooplankton. It is possible that a lack of ctenophore predation in the Barrington River allow zooplankton in the inner bay to survive and matching diversity (Kremer 1979). There may a few places where an error could have been made that would

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