f01u1p3 - Unit One Hydrodynamics Adapted Animals Lesson...

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Unit One Hydrodynamics Project Oceanography Fall 2001 16 Adapted Animals Lesson Objectives: Students will be able to do the following: Describe two food gathering mechanisms of animals in seagrass beds Compare and contrast features of sessile and motile organisms Define the term drag and explain its implication for animals in fluid environments Key Concepts: energy trade-offs, drag, suspension feeder, thrust Life’s a Drag As water flows around and over organisms of various shapes, it begins to change its flow pattern. This change in flow directly affects the organisms with which it comes in contact. Some organisms in seagrass beds depend on fluid movement for food gathering, reproduction, communication, and other life processes. In response to fluid movement, these organisms have undergone selection for traits that help to balance energy production and consumption, so they can survive. Energy is an important commodity in the aquatic world. Energy is gained from food and used to grow and reproduce. Energy is also used to move about or to resist moving about. Free-swimming organisms, such as fish, experience a force against their bodies known as drag as they move through the water. For instance, think about running along the beach and how much energy it takes. Then run in the water. The drag created on your legs and body requires you to use more energy as you try to move the same distance in the water. Organisms that are sessile and remain attached to a surface are also exposed to drag forces. For example, now try to stand still in the water. Again feel the pulling around your body and legs as the water rushes past. In both instances, whether the organism is motile or sessile, water flowing over and past them creates friction along their body. Organisms in the seagrass beds have to use energy to overcome these forces or use these forces to their advantage. Organisms exposed to fluid flow have a variety of behavioral and structural adaptions that help them live in moving water. Some organisms live a sessile life style attached to the substrate while others move through the water. Some organisms have flexible, lightweight skeletons while others have rigid armor for protection.
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Unit One Hydrodynamics Project Oceanography Fall 2001 17 Some live close together in colonies to save energy while others live far apart. Plants gain energy through the process of photosynthesis . There are many varieties of aquatic plants ranging from the giant kelps to the microscopic floating phytoplankton . Even though these plants have taken on different forms, they still need light energy and nutrients to photosynthesize. They need to grow at depths that give them adequate and appropriate amounts of light. They also need to have enough
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This note was uploaded on 07/31/2011 for the course OCB 6050 taught by Professor Staff during the Spring '11 term at University of South Florida.

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f01u1p3 - Unit One Hydrodynamics Adapted Animals Lesson...

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