Missing Sea Lions of Eastern of Alaska Term Paper

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Stellar Sea Lions of Eastern Alaska

Sea Lions of Eastern Alaska

B) 9,600 I estimated the 2004 population of Steller Sea Lions to be 2800, as indicated on the Y-axis of the graph. Plugging this figure into Trites' and Larkin's formula, I calculated as follows: Total population = 3.43 x 2800 = 9604.

E) 15 years Figure 3 shows the relative population changes for pollock, herring, and Western stock sea lions. The pollock population shows steady growth from 1985 to 1995. Assuming that the population number on the Y-axis are in thousands, the pollock population roughly 50,000 to 138,000 in southwest Alaska during that period. Growth of the pollock population appears to have increased slightly following the Pollock fishing ban, rising to roughly 58,000 in 1975. However, a pollock population decline was seen 10 years after the ban, and at the 15-year mark, the pollock population was approximately what it had been at the time the ban was instituted.

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Fifteen years of controlled fishing and an associated change in the ecosystem of southwest Alaska resulted in a significant increase in the pollock population.

3. C) 23 years Figure 2 shows the estimated growth rate of Eastern stock Steller sea lions from 1956 to 2000, a period of approximately 44 months. Without knowing the lifecycle of the Stellar sea lions and the death rate due to predation, I assumed a steady growth rate of the historical 3%. My calculations show that the Steller sea lion population would double in 23 years. Given:

5469 = Steller sea lion total population in Eastern Gulf of Alaska

5469 x 2 (doubling the population) = 10,938

5469 x .03 (historical growth rate) = 164.07

10793.54463 = Compounding for 23 years

See Excel Worksheet Calculations below:

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10938

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