Sand Grass 2 Species abundance curves Plot dominance density curves as

Sand grass 2 species abundance curves plot dominance

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2. Species-abundance curves. Plot dominance-density curves as described previously to illustrate the distribution of relative abundances among the species in the entire collections form seagrass and sand. Sand: Grass:
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B. Species Diversity Indices 1. Calculate the Shannon-Weiner index (H’) for the entire collections from both seagrass and sand, using the trawl data set. The Shannon-Weiner index is: H i S ' l o g 1 Where = the proportion of individuals in species i (=ni/N) And S = the number of species in the sample H’(sand) = 1.87 H’(grass) = 3.22 2. Calculate the Simpson index (C) for each of the sample groups where C 1 2 C(sand) = 0.77 C(grass) = 0.95 Include in your lab, the graphs and all diversity index calculations and answer the following: a. If the collectors curve becomes asymptotic, explain why. If it doesn’t discuss why not. The collector’s curve for the sand trawls does appear to approach an asymptote rather quickly, only rising by 1-2 species after trawl #2. This indicates that after our six trawls we have a good idea of the diversity in this area. Meanwhile, the curve for the grass trawls is continuously climbing through all six trawls, indicating that more trawls would be needed to obtain a good understanding of the diversity in that area. b. What can you say about the distribution of relative abundances and the diversity in seagrass vs. sand? The sand area appears to have a high dominance of crabs, especially mud and rock crabs, with significantly less fish. Meanwhile, the seagrass dominance curve is less steep in its slope, suggesting lower dominance overall, however fish appear to be more dominant in comparison to the sand.
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  • Fall '19
  • Biodiversity, Diversity index, Measurement of biodiversity, Shannon index, Zostera, Trawls

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