At-RiskPopulationsintheGulfofMexico.docx

The effect of the oil spill on this cohort is shown

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The effect of the oil spill on this cohort is shown by the much lower probability of the hatchlings surviving their first year immediately after the oil spill. This is represented in the graph by the severe downward slope of the line on the far left of the graph. For purposes of this study, a cohort is the batch of turtle hatchlings born in a particular year, and followed for research purposes (The Free Dictionary, (n.d.)). © Copyright 2017 College for America at Southern New Hampshire University. All rights reserved.
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Consider the Environment, After the Spill Report To help analyze what this means for the future of the Kemp’s Ridley sea turtle, we have constructed an age pyramid. On the left is a typical age pyramid for Kemp’s ridley sea turtles, and on the right is what it might look like in 2016. --Question 3: Please fill in the rest of the pyramid on the right.-- Sea Turtle—Age Pyramid Before Spill Sea Turtle—Projected Age Pyramid (2016) © Copyright 2017 College for America at Southern New Hampshire University. All rights reserved.
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Consider the Environment, After the Spill Report © Copyright 2017 College for America at Southern New Hampshire University. All rights reserved.
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Consider the Environment, After the Spill Report --Question 4. Briefly analyze the age pyramid. What features show the effect of the Gulf oil spill? How are young turtles (0–19) affected in particular? Predict what this might mean for the future of Kemp’s ridley sea turtles.-- The bar second from the bottom, representing ages 5-9, includes the population affected by the Gulf oil spill. The survival rate of this cohort is significantly lower than typical cohorts because of the impact the oil had on the turtles’ environment and food source. The bottom bar, ages 0-4, shows a more typical cohort size as these hatchlings were born 2-6 years after the oil spill and would not have been negatively impacted by the disaster. These turtles are the most endangered sea turtles in the world (“Oil Spill Impacts on Sea Turtles,” n.d.) so this oil spill puts them in danger of becoming extinct.
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  • Fall '18
  • Karen Gana
  • Population Ecology, Kemp's Ridley, Sea turtle, Deepwater Horizon oil spill

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