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. In which trial did the most control crabs die? In which did the most bled crabs die?

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Answer 1

Textbook Question

Chapter 24, Problem 1DAA

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 1DAA, 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.

In which trial did the most control crabs die? In which did the most bled crabs die?

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

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mussel defenses induced by the presence of crabs? Hypothesis: Mussels increase investment in defense in the presence of crabs Null hypothesis: Mussels do not increase investment in defense in the presence of crabs Experimental setup: Seawater No crab Crab (fed fish, not mussels) Mussels Mussels Prediction: Mussels downstream of the crab tank will have thicker shells than mussels downstream of the empty tank. Prediction of null hypothesis: Mussels in the two tanks will have shells of equal thickness Results: 0.6- 0.4- 0.2 00 No crab Crab What conclusion can you draw from the figure above? Without direct contact, mussels can sense the presence of crabs. O Mussels can sense the presence of crabs only visually. O Mussels are increasing their shell thickness in response to water current. Shell thickness is a non-inducible defense. O Crabs hunt for mussels by focusing on the chemicals they emit into the water. Shell thickness lmm)

PART A: Fishing for the Future Review the Tragedy of the Commons: https://youtu.be/CxC161GvMPc Additional resources for this laboratory exercise: Seafood Watch: http://www.seafoodwatch.org/ Center for Marine Conservation Ocean Action Network: www.cmc-ocean.org Marine Fish Conservation Network: www.conservefish.org World Wildlife Fund Conservation Action Network: www.takeaction.worldwildlife.org UN FAO Fisheries and Aquaculture Department: www.fao.org/fishery/en Marine Stewardship Council: www.msc.org/ 1 Why is conservation important? 2 Do a search online. What can you do to help protect the oceans?

Answer 2

Textbook Question

Chapter 24, Problem 1DAA

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 1DAA, 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.

In which trial did the most control crabs die? In which did the most bled crabs die?

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 24, Problem 1DAA

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 1DAA, 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.

In which trial did the most control crabs die? In which did the most bled crabs die?

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 24, Problem 1DAA

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 1DAA, 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.

In which trial did the most control crabs die? In which did the most bled crabs die?

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

Answer 8

Expert Solution & Answer

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.

Conclusion

The trial group 5 marked the highest number of control crabs that died.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

To explain: The trial in which the most control crabs died.

Introduction: Horseshoe crabs belong to the Phylum Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. The horseshoe crabs though they look like crustaceans are marine arachnids.

Answer 12

Explanation of Solution

The uniqueness of horseshoe crabs is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs 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.

In trial 5, the number of control crabs is 30, and 1 crab died out of it.