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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. Looking at the overall results, how did the mortality of the two groups differ?

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 24, Problem 2DAA
Textbook Problem
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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.

Chapter 24, Problem 2DAA, Sustainable Use of Horseshoe Crabs Horseshoe crab blood clots immediately upon exposure to bacterial

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.

Looking at the overall results, how did the mortality of the two groups differ?

Summary Introduction

To explain: The way in which the mortality of the two groups differs when the overall results are compared.

Concept introduction: Horseshoe crab belongs 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.

A total of 400 animals divided into 8 trial groups of 10s and 30s were studied for both control groups and bled animals group...

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