# A is the current population above or below the

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Unformatted text preview: a. Is the current population above or below the carrying capacity? Will the population increase or decrease in the next year? Current population is below the carrying capacity so we would expect the population to increase. b. What will be the population growth rate for 2013 (include units)? Ο Π Ξ Μ Ν Λ − = K N K N r dt dN max = = Ο Π Ξ Μ Ν Λ − 000 , 60 000 , 49 000 , 60 ) 000 , 49 )( 9 . ( 8085 people for the year c. What will be the population size at the start of 2014. 49,000 + 8085 = 57,085 people d. Fill in the following table: Year Population size Population growth rate 2013 49,000 8085 2014 57,085 2496.041625 2015 59,581 374.4296457 2016 59,955 40.04611425 2017 59,996 4.034052134 e. What happened to the population size over the years? What happened to the population growth rate over the years? Population size got closer and closer to the carrying capacity of 60,000. Population growth rate got smaller and smaller. f. Explain your answer from part (e) using what you know about carrying capacity. As the population gets closer and closer to the carrying capacity, the resources of the environment start to deplete and the growth rate slows. Limiting factors take over (especially density-dependent ones, space, food, water, shelter, etc) g. Explain your answer from part (e) using the formula: Ο Π Ξ Μ Ν Λ − = K N K N r dt dN max Look at this part of the formula: Ο Π Ξ Μ Ν Λ − K N K As the size of the population (N) gets closer and closer to the carrying capacity (K), then this part of the formula gets smaller and smaller, thus reducing population growth rate. Primary Productivity – The rate at which organic materials are stored 6CO 2 + 6H 2 O → C 6 H 12 O 6 + 6O 2 One can determine Primary Productivity by measuring dissolved oxygen in the water (as it is hard to measure it in the air) Conversion Factors: 1 ml of O 2 = .536 mg of Carbon assimilated To convert: ppm O 2 = mg O 2 /L mg O 2 /L x 0.698 = ml O 2 /L ml O 2 /L x 0.536 = mg carbon fixed/L Fill in the table and Graph Net and Gross Productivity vs % of light Using your data table, what seems to be the trend as the % of light decreases? WHY? As % of light decreases, productivity decreases resulting in less carbon assimilated. Less light = Less photosynthesis = Less carbon dioxide used = Less oxygen released into the water Using your data table, what seems to be the trend as the % of light increases? WHY? As % of light increases, productivity increases resulting in more carbon assimilated. More light = more photosynthesis = more carbon dioxide used = more oxygen released into the water Where would you say this organism is using as much energy as they are making? WHY? When Net = 0 (about 9%) This is where photosynthesis and respiration of the plant seem to be equal. No net oxygen is being released into the water, what is being released is equally being used by the plant in respiration. Using your table and graph, explain why most of the time there are bigger plants on land than in the sea? Explain this in terms of evolution. Plants evolved to live on land because it is easier to acquire carbon dioxide (more abundant), and there is more light available as it doesn’t have to % light DO (mg O 2 /L) Gross PP = ottle – Dark (mg O 2 /L) Net PP = Bottle – Light (mg O 2 /L) Gross on fixed in mgC/L Gross PP x 98 x 0.536 Initial 8.4 -- -- --...
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