Now that 1,864 is the estimated minimum population of pandas, pandas are not endangered anymore. The number increased over the past decade by 16.8% and the geographic range of giant pandas increased by 11.8% since 2003.
How does this compare to past figures?
-The first survey from 1970 Ford is 1977 evaluated that there were 2,459 giant pandas in the wild.
– The second survey from 1985 to 1988 estimated that there were 1,114 giant pandas in the wild.
Finally, the hard work of the Chinese government, the nature staff and the WWF is paying off.
Why were pandas initially endangered?
– Pandas eat 40 kilograms of bamboo daily and it is covered in cellulose that is hard to digest.
– Baby pandas are 150 grams when they are born which results in them dying because they have a weak immune system and their mothers sit on them occasionally because they are very small and unnoticeable.
-Female pandas ovulate for only 48 hours a year.
I have inserted a link to the WWF for some additional information about pandas.
Windsor, Canada is growing at rates that hasn’t been seen in at least two decades. What is causing the growth at such drastic rates? Experts are saying that the lure of a strong economy, affordability, access to the U.S., immigration and secondary immigration from within Canada are the cause.
From July, 2006 to July, 2009, the population decreased or remained the same for 36 consecutive months. It began to rebound in 2011, and the growth rate of the past 16 months is two to three times what the previous seven years produced.
This growth is extremely important because it isn’t just retirees. It is also young families with lots of children. It looks to grow even more as the agricultural area expands as well as the residential areas.
This growth is a great example of the hunter and the prey analogy that we spoke about in class. As the population grows, so does the work, but once the work is complete, then what happens to the population growth?
Windsor saw this happen in the 80’s when the GM and Ford companies began a tremendous amount of expansion. I hope that Windsor learned from history so that it doesn’t see an even larger recession in the near future.
Population growth does not follow exponential growth mainly because of limited resources. However, in laboratory environments populations can exhibit exponential growth. For example, bacteria populations grow incredibly fast because of their short reproductive times. In the article Exponential & Logistic Growth “we could start with just one bacterium and have enough bacteria to cover the Earth with a 1-foot layer in just 36 hours.”
In exponential growth models, the rate of growth in a population never changes and is typically unrealistic. In the real world resources like food, for example, will run out if a population keeps growing exponentially. Thus a population will reach its carrying capacity. Carrying Capacity is the maximum number of individuals a population can support based on that population’s needs.
As we discussed in class, the Rule of 70 is used to figure out how quickly something will double when it is growing exponentially. When you divide 70 by the percent increase the outcome is the doubling time. When you divide 70 by the doubling time the outcome is the growth. The Rule of 70 is often used to predict population growth but it has other uses as well. One of these other useful applications of the rule is estimating how long it would take a country’s real gross domestic product to double. Here you use the GDP growth rate in the divisor of the rule which is similar to calculating compound interest rates.
For example, if the growth rate of Japan is 10%, the Rule of 70 predicts that it would take seven years for Japan’s real GDP to double.
That being said, it is important to remember that the Rule of 70 is only an estimate based on forecasted growth rates. Therefore, if the rate of growth fluctuate then the original calculation may be inaccurate. Because of this, the Rule of 70 should not be used where growth rates are anticipated to vary dramatically.