10. Describe the relationship between the Cory's Shearwaters and the common dolphins. Is this an example of mutualism or interspecific competition? Discussion Questions 11. Explain why the open ocean is often called a "marine desert". 12. Why is migration so important to open -ocean animals? 13. What are some of the abiotic factors that influence food availability in the open ocean? 4. Why is it so vitally important that animals like the manta ray conserve energy? net Worksheets

## Step1<br />The relationship between Cory's Shearwaters and common dolphins is a form of mutualism. This is because both species benefit from their interaction. The dolphins help the shearwaters by driving fish towards the surface, making it easier for the shearwaters to catch their prey. In return, the shearwaters help the dolphins by providing them with food.<br /><br />## Step2<br />The term "marine desert" is used to describe the open ocean because it has a low nutrient content, similar to a desert. This is due to the fact that the nutrients in the ocean are often scarce, making it difficult for marine life to survive.<br /><br />## Step3<br />Migration is crucial for open-ocean animals because it allows them to move to areas with higher food availability. This is especially important for animals like the manta ray, which need to conserve energy. By migrating, these animals can avoid harsh conditions and find food more easily.<br /><br />## Step4<br />The abiotic factors that influence food availability in the open ocean include temperature, light, and pressure. These factors can affect the growth and survival of phytoplankton, which are the primary producers in the ocean. Changes in these factors can lead to changes in the availability of food for other organisms in the ocean.<br /><br />## Step5<br />Manta rays need to conserve energy because they are slow swimmers and rely on their large, flat bodies to catch prey. If they used too much energy, they would not be able to survive.