Animal Behavior Lab Report

Animal Behavior Lab Report - Seta Degann Ghalib Ahmed...

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Seta Degann 10/28/08 Ghalib Ahmed, Brittany Mani The Behavior of Manduca sexta Introduction Animal behavior is the study of an organism’s response to certain stimuli in its environment. Scientists often formally describe and quantify the behavior of an organism through an ethogram. Ethograms can often help scientists understand why and how these organisms survive, mate, and insight into evolutionary behavior. According to the Tinbergen’s model of animal behavior study, one should observe, then describe the behavior, then they should ask four kinds of questions. The first question is the causation of the behavior, how the behavior is elicited. The second question is the development of the behavior. There are two ways in which a behavior is developed: innate and learned. The next question is the evolution of the behavior, in which a behavior is compared in two different species to shed light on the evolution of those behaviors. The final question to ask is the function of the behavior. If the behavior increases the animal’s survival or reproductive success then it is said to increase the animal’s fitness. A fixed action pattern is a result of a signal from the environment; these are most common among insects. A kinesis is an increase of activity due to a stimulus. A taxis is a movement away or towards a
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certain stimulus. (Bonner et al., F-1, 3, 4). The insect we will be using for this experiment is Manduca sexta , also known as the Tobacco Hornworm. There are four stages of the life cycle: egg, larva, pupa, and adult. The larval stage has five instar stages, which last about 11 days in total; this is the stage we will be working with (Bonner et al., F-6). Positive phototaxis is when an animal prefers light and negative is when the animal prefers dark. The purpose of the first experiment is to determine whether the hornworm is positively or negatively phototactic. the I believe the Manduca sexta will be negatively phototacic because they tend to live under leaves in order to avoid predators. Positive thermotaxis is when the animal prefers warmer temperatures and negative thermotaxis is when the animal prefers cooler temperatures. The purpose of the seconds experiment is to determine whether the hornworm is positively or negatively thermotactic. I believe it will be negatively thermotactic because the
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