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Sustainable Use of Horseshoe Crabs Horseshoe crab blood clots immediately upon exposure to bacterial toxins, so it can be used to test injectable drugs for the presence of dangerous bacteria. To keep horseshoe crab populations stable, blood is extracted from captured animals, which are then returned to the wild. Concerns about the survival of animals after bleeding led researchers to do an experiment. They compared survival of animals captured and maintained in a tank with that of animals captured, bled, and kept in a similar tank. FIGURE 24.28 shows the results. FIGURE 24.28 Mortality of young male horseshoe crabs kept in tanks during the 2 weeks after their capture . Half the animals were bled on the day of their capture. Control animals were handled, but not bled. This procedure was repeated 8 times with different sets of horseshoe crabs. Based on these results, would you conclude that bleeding harms horseshoe crabs more than capture alone does?
Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
Sustainable Use of Horseshoe Crabs Horseshoe crab blood clots immediately upon exposure to bacterial toxins, so it can be used to test injectable drugs for the presence of dangerous bacteria. To keep horseshoe crab populations stable, blood is extracted from captured animals, which are then returned to the wild. Concerns about the survival of animals after bleeding led researchers to do an experiment. They compared survival of animals captured and maintained in a tank with that of animals captured, bled, and kept in a similar tank. FIGURE 24.28 shows the results.
FIGURE 24.28 Mortality of young male horseshoe crabs kept in tanks during the 2 weeks after their capture. Half the animals were bled on the day of their capture. Control animals were handled, but not bled. This procedure was repeated 8 times with different sets of horseshoe crabs.
Based on these results, would you conclude that bleeding harms horseshoe crabs more than capture alone does?
To explain: If bleeding harms the horseshoe crabs more than capture alone does, based on the result.
Concept introduction: Horseshoe crabs belong to Phylum: Arthropoda. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids. The control horse shoe crabs are those whose blood was not extracted, and the experimental horseshoe crabs are those whose blood was extracted.
Explanation of Solution
The uniqueness of horseshoe crab is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crab is taken and then let out in their habitat in order to conserve their population, but this might also lead to their death. Therefore, experiments were conducted to check their survival after taking their blood.
Experiment design:
A total of 400 animals were divided into 8 trial groups of 10s and 30s and were studied for both control group and bled animals group.
Control group:
The control group animals were captured and then let out back to their habitat. The control group had a total of 200 animals...
Chapter 24 Solutions
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