Exam 2 - Insect Behavior Behavior is result of interactions...

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Insect Behavior Behavior – is result of interactions between an insect and its environment Kinds of behaviors Innate – behavior genetically encoded. Born to exhibit these behaviors o Simple Innate Behavior Stimulus Response o Complex Innate Behaviors Stimulus Multiple responses they can switch between Learned Innate Behavior Regulation Inhibitory Centers in Protocerebrum Endogenous Rhythms = Internal Clock Hormonal Regulation Innate Behavior Modification = Behavioral Plasticity Kinesis – is an undirected movement in response to a stimulus. The activity of movement being in direct response to intensity of stimulus. (roaches example) Taxis – is a directed movement in response to a stimulus o Phototaxis – Response to light can be positive or negative o Geotaxis – Response to gravity o Chemotaxis – Response to chemical Learning – Requires memory Insect – Some can learn, capacity is limited Innate Behavior far more important in insect’s life Some Types of Learn 1) Shock avoidance learning 10-9-06 Insect Social Behavior I. Introduction a. Presocial Behavior – live in nest, females care for own brood b. Eusocial Behavior – highest level of insects cooperating with one another i. Primatively eusocial behavior ii. Advanced eusocial behavior c. Eusocial (Truly social) Insects Observed in just 4 insect groups i. Termites ii. Ants iii. Some wasps iv. Some bees
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Common Attributes of Eusocial Insects 1) Care of young (brood care) is cooperative individuals care for other’s young 2) Division of labor particularly w/respect to reproduction – caste system a. In a caste system many members of the colony are reproductively sterile 3) Generations overlap – offspring of one generation assists their parents in rearing more offspring II. Social Communication a. Sound (Acoustic) b. Touch (Tactile) c. Taste (Gustatory) d. Smell (Olfactory) Whys Social Communication 1) Nest Defense a. Alarm Phermone b. Tactile from scrambling over one another c. Acoustic signals 2) Control/Attraction a. Olfactory b. Nest odor – pheromones, blend of gasses, food 3) Recruitment – for food a. Tandem running – inefficient way to recruit nestmates to a food source b. Odor trail – much more efficient c. Waggle dance – visual d. Round dance – visual III. Division of labor in social insects a. Castes are the most unique feature of truly social insects b. Queen – always female function to reproduce c. Worker – termites, male or female, adult/juvenile d. Soldier – termites, male or female, i. Hymenoptera – female e. King – Termites only. In termite colonies, always some around male reproductives f. Drones – Male reproductives in hymenoptera Five Concepts Concerning Castes 1) Polymorphism *Many Forms*- Members of different castes often look different from one another 2) Polyethism *Many Behaviors* - Member of different castes often exhibit different behaviors.
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Exam 2 - Insect Behavior Behavior is result of interactions...

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