5 Dolphin Case Study
Lab Objectives
At the conclusion of the lab, the student should be able to:
- Define unusual mass stranding events
- Explain the difference between mass strandings and an unusual mass stranding event
- State one symptom of cetacean morbillivirus and explain in general how the virus is spread
- Explain in general how a virus can spread through a population of organisms
- Explain in general how a vaccine works
- State two different ways a vaccine can be created
Introduction
In July 2013, stranding teams (such as the Virginia Aquarium’s Stranding Response team) from New York to North Carolina started noticing a large number of dolphin strandings.
Some data that was collected on how many dolphins were being found dead or dying on the beaches:
- 430 from July to September
- 553 total from July to November
- 6 in one day in Virginia Beach
Using your computer and the Internet, research dolphin strandings. Here is one website to get you started: NOAA Strandings. Answer the questions below based on your research. Please put your answers in your own words. Copying directly from a website is considered plagiarism.
- Give two examples of marine mammals that can strand themselves.
- Give two specific reasons why marine mammals strand themselves.
- Using the data above, how many dolphins were found a year on average in the Mid-Atlantic states in the years 2007–2012?
- How much larger were the number of strandings in 2013? Calculate how many times larger.
These data lead researchers to believe that this event in 2013 would be classified as an Unusual Mortality Event (UME). Using your computer and the Internet, research UMEs. Here is one website to get you started: Marine Mammal Unusual Mortality Events (http://www.nmfs.noaa.gov/pr/health/mmume/). Answer the questions below based on your research. Please put your answers in your own words. Copying directly from a website is considered plagiarism. - Explain the difference between mass strandings, group strandings, and an unusual mass stranding event.
- The dolphins that washed ashore exhibited skin lesions and weight loss that was abnormal for bottlenose dolphins.
- What kinds of data do you think would be useful in determining the cause of this UME event based on the condition of the dolphins? Name three things you think researchers should record about these dolphins.
- Some scientists remembered that there was a similar case in 1987–1988, as described in Morbilliviral Disease in Atlantic Bottlenose Dolphins and in Dolphin Strandings.
- What happened to bottlenose dolphins in 1987–1988?
- Does this UME seem similar to that situation? Why or why not?
In the 2013 strandings, dolphins were tested for cetacean morbillivirus, and approximately 85% of them were positive (NOAA.gov data). Using your computer and the Internet, research cetacean morbillivirus. Here is one website to get you started: Morbillivirus Infection. Answer the questions below based on your research. Please put your answers in