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At-RiskPopulationsintheGulfofMexico.docx

Question 5 was the oil spill a density dependent or a

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--Question 5. Was the oil spill a density-dependent or a density-independent factor for the sea turtles? Briefly explain.-- The oil spill was a density-independent factor for the sea turtles. The impact of the oil on the turtles’ environment and food source was not a result of the size of their population, but external to it. (Kahn Academy, 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 II. Bottlenose Dolphins Introduction Bottlenose dolphins spend much of their time far out to sea, and thus were less likely to come into direct contact with the oil spill. However, dolphins are mammals and must surface to breathe, which brought many dolphins into direct, and often fatal, contact with oil. (“Common Bottlenose Dolphin,” n.d.; “Oil Spill Impacts on Sea Turtles,” n.d.) Another problem for bottlenose dolphins was food scarcity and contaminated prey. (Pappas, 2012) Dolphins are carnivores, feeding primarily on fish, shrimp, and squid. (“Common Bottlenose Dolphin,” n.d.) The oil from the spill contaminated the dolphins’ food source and caused drops in the numbers of animals they could eat. How have these two risks affected the dolphin population? Bottlenose dolphins are thus facing two different risks from the oil spill: coming into contact with oil through surfacing and food scarcity. Both of these risks will have the effect of limiting the population size. --Question 6. Is the first risk—direct contact with oil—an example of a density-independent or density-dependent regulating factor? Explain.-- The oil spill was a density-independent factor for the dolphins. The oil in their environment that they came in contact with was not the result of the dolphin population, but external to it. (Kahn Academy, n.d.) Food scarcity, the second risk, affected the number of dolphins the Gulf of Mexico can support. This number is called the [--Question 7. Fill in the missing term _ carrying capacity (Kahn Academy, n.d.) --] . If the population of dolphins was well below the [--Question 8. Use the same term as Question 7. _ carrying capacity (Kahn Academy, n.d.) --] before the spill, the population would have been [--Question 9. Select the correct answer increasing (Kahn Academy, n.d.) /
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  • Fall '18
  • Karen Gana
  • Population Ecology, Kemp's Ridley, Sea turtle, Deepwater Horizon oil spill

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