At the current rate of increase in the Eastern stock sea lion population, approx

Question

At the current rate of increase in the Eastern stock sea lion population, approximately how long would it take for the population to double?

iPad 11% 12-37 PM portal.utoronto.ca alaskafisheries.noaa.gov/sites/default/files/range In 2 of 9 Studies conducted by the Alaska Fisheries Science Center of the National Marine Mammal Laboratory have established that Steller sea lions have been disappearing at an alarming rate in Alaskan waters. Since the 1970's, these marine mammals have experienced a severe overall decrease in population, but the decrease has not been uniform across their geographic distribution. The region containing the Western stock of Steller sea lions (Prince William Sound through the Aleutian Islands; Fig. 2) has observed an 85-90% decrease in the abundance of sea lions. In contrast, the Eastern stock (located on the southeast coast of Alaska; Fig.2) experienced a modest population increase of approximately 3% per year starting in 1970's (Fig. 3A and 3B); more recently (since 2010), the growth rate has averaged more than 4%/yr (NOAA Fisheries) 300 000 250 000 200 000 150 000 100000 50 000 60,000 50,000 40,000 30,000 20,000 10,000 Trends in Non-Pup Steler Sea Lion Counts in the Eastern and Western Stocks Eastem Stock -Western Stock Eastern stock 1960 1970 1980 990 2000 1980 1985 1990 1995 2000 2005 Fig 3A. Estimated numbers of Steller sea lions (all ages) in Alaska from 1956 to 2000 (from Trites and Larkin, 1996; A.W. Trites, unpublished data) Fig. 3B. Estimated total population of Steller sea lions. (NOAA National Marine Laboratory)

Explanation / Answer

2. The ban of commercial fishing is in southwestern coast of Alaska and not in southeastern.

F) There was no change in southeastern stocks as a result of ban.

3. The current or recent increase rate is 4% per year.

Using rule of 70,

teh doubling time, = 70/4 = 17.5 years.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.