Animal Behavior Isopods

Animal Behavior Isopods - Lab Directions and Assignment...

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Page 1 of 7 Lab Directions and Assignment Animal Behavior: Isopods General Biology 1 The Johns Hopkins University This assignment is due the next time your lab meets. 100 points possible GOAL : In this lab you will investigate animal behavior. Specifically, you will study the movement of the isopod known as a pillbug ( Armadillidium ). BACKGROUND INFORMATION: Information about isopods (1) Two types of locomotion: kinesis and taxis Taxis and kinesis are examples of locomotion : movement which causes an entire organism to move from one position to another. “A kinesis is a relatively fixed locomotor behavior in which the organism does not orient its body with respect to the stimulus. Instead, a combination of random turning and adjusting the speed of locomtion according to the intensity of a stimulus can result in an organism moving toward or away from the stimulus. For example, for pill bugs, a dry environment is a stimulus for increased activity, which continues until the animal reaches the damper environment it prefers. The pill bug’s diminished activity in a moist habitat tends to keep it from wandering away from optimum conditions. A taxis is a relatively fixed locomotor behavior in which movement is oriented—the animal heads either toward or away from the stimulus and steers according to its location.” (2)
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Page 2 of 7 While a dry environment elicits kinesis in the pillbug, there are other stimuli in a pillbug’s environment that elicit taxis instead.
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Animal Behavior Isopods - Lab Directions and Assignment...

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