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Population Growth
R and K Selection
R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.
Can a species undergo exponential growth indefinitely? Explain your answer. |
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- Can a species undergo exponential growth forever? Explainyour answer.Give the equation that describes exponential growth and explainwhat the terms in the equation mean.what is k and r for each condition? K (carrying capacity): can be estimated by finding the point where the growth curve levels off. Take the average of this data point and all data collected beyond this point to estimate k (note: if the bacteria population is still growing, you can just take the last value of data for k. r: choose any two points at the log phase of growth. Then use the r formula. Just choose two waste conditions for r and k calculation so I can get the idea of how to do this, thanks.
- Could there be any advantage for a Phytoplankton cell to not minimize the sinking rate? Explain.(d) One cup of the algae above stores 43 calories of energy. There happens to be 6,750,000 cups of algae available in the area that the seal lives in. Knowing that one cup equals 128 grams, and the seal must consume 7500 calories per day... ) Calculate how much energy would be transferred to the seal if all of the energy in the algae population available in that area made its way to the seal through the food web above. (ii) Assume the seal consumes its daily calories per day. Describe how many days the seal would be able to live off of the energy transferred to it by the algae.Question 1 In a plot of species richness as a function of the number of samples taken ______________. A) additional samples after the asymptote will add little new information. B) the asymptote represents species evenness. C) a bimodal curve indicates a high degree of endemism. D) the slope of the line at the asymptote is a measure of beta diversity. Question 2 Habitats with moderate levels of disturbance have higher species diversity. A) True B) False
- How does illegal fishing bombs may aid the problem of mass extinction? Explain your answer.You are culturing 2 algal species. Species A has a maximum photosynthetic output of 8 mg C mg-1 chl a h-1 and a half saturation constant of 20 µE m-2 s-1. Species B reaches a maximum photosynthetic output of 4 mg C mg-1 chl a h-1 and has half saturation constant of 18 µE m-2 s-1. Which species will be growing faster at a PAR light intensity of 80 µE m-2 s-1? Why?How would the growth rate pattern be affected by infinite resources?
- Lastly, notice the yellow graph for "Net Exports": in 2008 it was about +400, meaning the US exported 400 million gallons of biodiesel. But for the past several years "Net Exports" has been in negative territory, meaning that we IMPORT biodiesel from other countries! (this isn't surprising, notice that green consumption is consistently larger than blue production). The US first started importing biodiesel in the year U.S. Biodiesel Production, Exports, and Consumption Print Dow 2,500 • Production + Net Exports + Consumption 2,000 1,500 1,000 -500 -1,000 2001 Last updated October 2018 2004 2007 2010 2013 2016 Printed on: Aay 10 Millions gallonsWe have seen that energy is essential for life on earth. All organisms need energy to maintain their cellular processes. There are two basic ways of generating energy de novo, at the base of food webs. Describe the two primary ways that autotrophic organisms generate energy, including the original source of energy and the primary organisms that carry out each process.Why are nuclear plants considered threat to ecological security?